Functional Significance of Cell Volume Regulatory Mechanisms
Abstract
Lang, Florian, Gillian L. Busch, Markus Ritter, Harald Völkl, Siegfried Waldegger, Erich Gulbins, and Dieter Häussinger. Functional Significance of Cell Volume Regulatory Mechanisms. Physiol. Rev. 78: 247–306, 1998. — To survive, cells have to avoid excessive alterations of cell volume that jeopardize structural integrity and constancy of intracellular milieu. The function of cellular proteins seems specifically sensitive to dilution and concentration, determining the extent of macromolecular crowding. Even at constant extracellular osmolarity, volume constancy of any mammalian cell is permanently challenged by transport of osmotically active substances across the cell membrane and formation or disappearance of cellular osmolarity by metabolism. Thus cell volume constancy requires the continued operation of cell volume regulatory mechanisms, including ion transport across the cell membrane as well as accumulation or disposal of organic osmolytes and metabolites. The various cell volume regulatory mechanisms are triggered by a multitude of intracellular signaling events including alterations of cell membrane potential and of intracellular ion composition, various second messenger cascades, phosphorylation of diverse target proteins, and altered gene expression. Hormones and mediators have been shown to exploit the volume regulatory machinery to exert their effects. Thus cell volume may be considered a second message in the transmission of hormonal signals. Accordingly, alterations of cell volume and volume regulatory mechanisms participate in a wide variety of cellular functions including epithelial transport, metabolism, excitation, hormone release, migration, cell proliferation, and cell death.
I. INTRODUCTION
With only few exceptions (416), the membranes of animal cells are highly permeable to water (212776). Animal cell membranes cannot tolerate substantial hydrostatic pressure gradients, and water movement across those membranes is in large part dictated by osmotic pressure gradients (4064456089851043). Thus any imbalance of intracellular and extracellular osmolarity is paralleled by respective water movement across cell membranes and subsequent alterations of cell volume.
As outlined below, most mammalian cells are bathed in extracellular fluid with almost constant osmolarity. Nevertheless, considerable alterations of extracellular osmolarity are encountered in a variety of diseases. Excessive alterations of extracellular osmolarity occur in kidney medulla during transition between antidiuresis and diuresis (63).
Even at constant extracellular osmolarity, cell volume constancy is compromised by alterations of intracellular osmolarity. A wide variety of metabolic pathways leads to cellular formation or dissipation of osmotically active substances. Moreover, transport across the cell membrane modifies cellular osmolarity and thus cell volume.
To avoid excessive alterations of cell volume, cells have developed and utilize a multitude of volume regulatory mechanisms including transport across the cell membrane and metabolism. These mechanisms are triggered by minute alterations of cell volume. They not only serve to readjust cell volume but profoundly modify a wide variety of cellular functions. Thus cell volume is an integral element within the cellular machinery regulating cellular performance.
It is the aim of this review to illustrate the functional significance of cell volume. To this end, a description of the volume regulatory mechanisms and the cellular functions sensitive to cell volume is followed by a discussion of the role of cell volume in several integrated cell functions.
This review does not consider volume regulatory mechanisms in prokaryotic cells or comparative aspects of cell volume regulation, and the reader may refer to the respective pertinent literature (8496128175225232236309336387–391395400604698763792852970112111381168).
Instead, the discussion focuses on the significance of cell volume for the performance of mammalian cells. Moreover, the paper stresses recent developments. For a more complete coverage of earlier literature, the reader may refer to previous reviews on cell volume regulation (114425539545682776778815817843911a97110611168), osmolytes (63142144370), and the role of cell volume in regulation of cell function (495693).
For various functions, experimental evidence pointing to the involvement of cell volume and cell volume regulatory mechanisms is intriguing but far from conclusive. It is hoped that this review stimulates further experimental effort in this exciting area of research to clarify the many remaining questions.
II. CELL VOLUME REGULATORY MECHANISMS
Rapid changes of cell volume are usually caused by movement of water across the cell membrane (Jv), which is driven by a hydrostatic (Δp) and osmotic (Δπ) pressure gradient and depends on the hydraulic conductivity of the cell membrane (Lp)
The Lp depends on the presence of water channels (aquaporins) in the cell membrane, a family of molecules, which are inserted into the cell membrane and allow the passage of water (6214270300349356494536565773980). The aquaporins are especially important in water transporting epithelia but may be expressed in nonepithelial cells. Even though osmotically driven water transport is an obvious requirement for osmotic cell swelling and cell volume regulation, water movement across the cell membrane is rarely a limiting factor in cell volume changes. Thus alterations of intra- or extracellular osmolarity are in general followed by the respective movements of water and alterations of cell volume.
Cell volume regulatory mechanisms are thus most conveniently disclosed by exposing cells to abrupt changes of extracellular osmolarity. If cells are exposed to hypotonic extracellular fluid, they initially swell as more or less perfect osmometers but then approach the original cell volume by so-called regulatory cell volume decrease (RVD). If cells are exposed to hypertonic extracellular fluid, they initially shrink like almost perfect osmometers but then may approach the original cell volume by so-called regulatory cell volume increase (RVI). It should be kept in mind, however, that exposure of cells to anisotonic extracellular fluid does not only modify cell volume but also the volume of intracellular organelles such as mitochondria (969). Furthermore, in parallel to cellular osmolarity, cellular ionic strength is altered even if extracellular ionic strength is kept constant. Thus the sequelae of osmotic alterations of cell volume are not necessarily identical to the consequences of isotonic alterations of cell volume.
Alterations of cell volume may be limited by constraints from extracellular tissue, as shown for the brain (1220), the heart (972), and renal proximal tubules (753755). More important, however, is the ability of cells to adjust intracellular osmolarity by ion movement across the cell membrane and by generation, breakdown, uptake, or release of organic substances.
Ions contribute the bulk of intracellular (mainly K+) and extracellular (mainly NaCl) osmolarity. Furthermore, ions contribute some two-thirds to cell volume regulation after rapid alterations of extracellular osmolarity (3311266). Thus ion transport across the cell membrane is of paramount importance for the regulation of cell volume. Largely because of volume regulatory ion transport, RVD and RVI are accomplished within minutes after exposure to anisotonic media.
A. Ions in Steady-State Maintenance of Cell Volume
To maintain their metabolic functions, cells have to accumulate a number of substances, such as proteins, amino acids, or carbohydrate metabolites. The concentration of these substances is higher within the cells than in extracellular fluid. The excess cellular concentrations of these organic substances are counterbalanced by lower intracellular ion concentration. Most cells extrude Na+ in exchange for K+ by the Na+-K+-ATPase. The cell membrane is only poorly permeable to Na+, and the exclusion of impermeable Na+ outweighs the cellular osmolarity created by impermeant organic solutes (double Donnan hypothesis; Refs. 721776). On the other hand, the cell membrane is highly permeable to K+. The exit of K+ creates an outside-positive cell membrane potential, which drives Cl− out of the cell. The low intracellular Cl− concentration compensates for the excess intracellular concentration of organic substances.
Inhibition of the Na+-K+-ATPase with ouabain eventually leads to cell swelling (see Table 2) because of dissipation of the Na+ and K+ gradients, depolarization of the cell membrane, and subsequent entry of Cl− into the cells (688779). However, inhibition of the Na+-K+-ATPase does not always lead to a rapid increase of cell volume, which may remain constant (4077799241039) or even transiently decrease (166319191131). A sequence of events leading to cell shrinkage after inhibition of the Na+-K+-ATPase includes increase of intracellular Na+ activity, reversal of Na+/Ca2+ exchange, increase of intracellular Ca2+ activity, subsequent activation of Ca2+-sensitive K+ channels, hyperpolarization (despite decrease of intracellular K+ activity), and cellular KCl loss. Obviously, the time required by ouabain to eventually cause cell swelling depends on Na+ entry. In thick ascending limb (5195201178) or diluting segment (444) of the nephron, for instance, swelling can be delayed by inhibition of Na+-K+-2Cl− cotransport.
| Factor | Cell Affected |
|---|---|
| Factors leading to cell swelling | |
| Insulin | Hepatocytes (447247395312871286), pneumocytes (805) |
| IGF-I | Hepatocytes (1285) |
| Growth hormone | Chondrocytes (557) |
| ADH (AVP) | Glial cells (259705) |
| Glucocorticoids | Hepatocytes (660) |
| Fibroblasts (316) | |
| Mineralocorticoids | Leukocytes (1329–1331) |
| Estrogens | Astrocytes (344) |
| Parathyroid glands (137) | |
| Progesterone | Astrocytes (344) |
| Parathyroid glands (137) | |
| Testosterone | Parathyroid glands (137) |
| Gonadotropin | Leydig cells (1346) |
| Somatostatin | Colon cells (277) |
| Adenosine | Erythrocytes (1132) |
| Angiotensin | Vascular smooth muscle cells (296) |
| Interleukin | Lymphocytes (1184) |
| α-Adrenergic | Hepatocytes (1286) |
| β-Adrenergic | Erythrocytes (56323459862) |
| Salivary glands (172) | |
| Sweat glands (907) | |
| Acetylcholine* | Sweat glands (907) |
| Myogenic L6 cells (1110) | |
| Glutamate* | Glial cells (73185486–48859410841151) |
| Neurons (1851869751059) | |
| Kainate | Neurons (24999) |
| NMDA | Brain (1901267) |
| Aspartate | Neurons (1059) |
| Deoxyadenosine | Lymphoblastoid cells (36) |
| cAMP | Sweat glands (907) |
| cGMP | Barnacle muscle (957) |
| PKC-ε,δ | Promyelocytes (1302) |
| Arachidonic acid | Glial cells (11471148) |
| ras Oncogene | Fibroblasts (695824) |
| Phorbol esters | Necturus gallbladder (247) |
| Genistein | Tumor cells (925) |
| Okadaic acid | Erythrocytes (581597941) |
| Superoxide | Erythrocytes (1247) |
| Lithium | Erythrocytes (935944) |
| Magnesium | Erythrocytes (332943944) |
| Amino acid uptake | Hepatocytes (43516020434247150265365413001341) |
| Proximal renal tubule (6769122173) | |
| Intestine cells (70678578893010921095) | |
| Glucose uptake | Necturus gallbladder (355) |
| Kidney (67) | |
| LLC-PK1 cells (75) | |
| Intestine cells (785) | |
| Vascular smooth muscle cells (881) | |
| Mesangial cells (620) | |
| Bile acids | Hepatocytes (497506) |
| Increase of K+ | Hepatocytes (1261) |
| Gallbladder epithelium (229528639) | |
| Proximal renal tubule (2616316891282) | |
| Renal cortical slices (973) | |
| Thick ascending limb (1178) | |
| Amphiuma diluting segment (443) | |
| Shark rectal gland (638) | |
| Glial cells (462595946126287318028479021086) | |
| Neurons (24331086) | |
| Retinal Müller cells (312) | |
| GH-producing cells (307) | |
| Adrenal glomerulosa cells (513) | |
| Vestibular dark cells (1314) | |
| Ba2+, quinidine* | Proximal renal tubule (11741282) |
| Hepatocytes (12498618) | |
| A6 cells (272a) | |
| MDCK cells (1176) | |
| Ouabain* | Necturus gallbladder (251378) |
| Thick ascending limb (1179) | |
| Collecting duct principal cells (11641165) | |
| Neurons (168) | |
| Platelets (806) | |
| Enterocytes (784) | |
| Sperm (258) | |
| HCO−3 | Parotid glands (976) |
| Acidosis | Proximal renal tubule (11741175) |
| Neurons (11491150) | |
| Glial cells (61188311451146114911511172) | |
| Esophageal cells (1214) | |
| (Short chain)fatty acids* | Enterocytes (2782801032) |
| Proximal renal tubule (1016) | |
| Erythrocytes (385) | |
| Brain (178) | |
| Vestibular dark cells (1313) | |
| Shark rectal gland (315) | |
| NH3 | Astrocytes (867897898) |
| Opossum kidney cells (982) | |
| Cytochalasin B | Lymphoblast cells (36) |
| Colchicine | Lymphoblast cells (36) |
| Vinblastine* | Lymphoblast cells (36) |
| Endotoxin | Hepatocytes (127) |
| N-methylformamide | HT-29 cells (260) |
| Chlorpromazine* | Erythrocytes (2191205) |
| Hydroxyurea | Endothelial cells (2) |
| Ethanol | Hepatocytes (1362) |
| Adenohypophysial cells (1063) | |
| Cardiac cells (552) | |
| Proximal tubule cells (600) | |
| Dideoxycytidine | Monoblastoid cells (115) |
| Mercurials | MDCK cells (1028) |
| Shark rectal gland (637) | |
| Dioxin* | Hepatocytes (1344) |
| Veratridine | Neurons (190) |
| Hyperthermia | Chondrocytes (335) |
| Osteoblasts (335) | |
| Hemolysin | Erythrocytes (556) |
| Photofrin | Tumor cells (729730) |
| Fertilization | Sperm (1212) |
| Electric field stimulus | Outer hair cells (906) |
| Factors leading to cell shrinkage | |
| Glucagon | Hepatocytes (3794731287) |
| VIP | Intestine (2769011297) |
| Somatoliberin (hGHRH) | GH-producing cells (307) |
| ADH | MDCK cells (1176) |
| Hepatocytes (1286) | |
| Atriopeptin (ANF) | glial cells (705) |
| Cardiac myocytes (198199201) | |
| NO | Heart (200201) |
| ATP | Endothelial cells (916) |
| Hepatocytes (1286) | |
| Bradykinin | Enterocytes (1210) |
| Fibroblasts (1005) | |
| Ehrlich cells (5471126) | |
| Endothelial cells (916) | |
| Histamine | Enterocytes (1210) |
| Ehrlich cells (547) | |
| Thrombin | Enterocytes (1210) |
| Ehrlich cells (5471126) | |
| Serotonin | Leech glial cells (46) |
| Adenosine | Renal collecting duct (1107) |
| Hepatocytes (1286) | |
| fMLP | Granulocytes (955) |
| Corticostatic peptides | Enterocytes (786) |
| α-Adrenergic | Hepatocytes (849) |
| Salivary glands (797) | |
| Isoprenaline | Nonpigmented ciliary epithelium (183) |
| Acetylcholine* | Salivary glands (3383416997978468728738829119761363) |
| Sweat glands (11811189) | |
| Enterocytes (12101297) | |
| PGE2 | Erythrocytes (743) |
| H2O2 | Hepatocytes (4701045) |
| cAMP | Necturus gallbladder (229994) |
| Hepatocytes (1286) | |
| MDCK cells (8288298331176) | |
| Barnacle muscle (957987) | |
| Pulmonary epithelium (787) | |
| Pancreatic epithelial cells (1182) | |
| Pancreatic epithelium (643) | |
| Intestine (1251) | |
| Nonpigmented ciliary epithelium (183) | |
| cGMP | Heart (199201) |
| A23187* | Pulmonary epithelium (787) |
| Enterocytes (7861210) | |
| Erythrocytes (134310) | |
| Fibroblasts (1358) | |
| Neuroblastoma cells (233) | |
| Thapsigargin | Enterocytes (786) |
| Okadaic acid* | Hepatocytes (101) |
| Cytochalasin B | MDCK cells (828829) |
| Colchicine | Macrophages (821) |
| Ouabain | Neurons (16) |
| Cardiac myocytes (1131) | |
| Vascular smooth muscle cells (919) | |
| Proximal renal tubules (631) | |
| Decrease in K+o | Erythrocytes (291) |
| Leech glial cells (46) | |
| Pigmented ciliary epithelium (301) | |
| Removal of Na+o | Muscle cells (959) |
| Pigmented ciliary epithelium (301) | |
| Removal of Cl−o | Kidney (777) |
| Pigmented ciliary epithelium (301) | |
| Toad bladder (740) | |
| Amphibian skin (4341246) | |
| Erythrocytes (933939) | |
| Removal of Ca2+o | Muscle cells (958) |
| Mg2+ depletion | Erythrocytes (711) |
| Starvation | Hepatocytes (31140) |
| Heme oxygenation | Erythrocytes (163164) |
| Elastin peptides | Tumor cells (946) |
| Urea | Proximal renal tubules (359) |
| Hepatocytes (474) | |
| Erythrocytes (936) | |
| Mastoparan | MDCK cells (1350) |
| NDS | Enterocytes (790) |
| Furosemide* | Macula densa cells (964) |
| MDCK cells (1176) | |
| MAG-3but | HL-60 leukemic cells (162) |
| Ethanol | Prolactin-secreting cells (10631068) |
| Thyrotropin-releasing cells (1063) | |
| Amphotericin B | Cornea epithelium (992) |
| Macrophages (299) | |
| Lead | Erythrocytes (310) |
| Cisplatin | Renal tubule cells (110) |
| Noise | Auditory hair cells (275) |
Under the influence of ouabain, hepatocytes and renal cortical cells are apparently able to maintain their cell volume by electrolyte accumulation in intracellular vesicles, which are subsequently expelled by exocytosis (103810391257–1260). The electrolyte accumulation is accomplished by a H+-ATPase in parallel to Cl− channels (1039). At least theoretically, a H+-ATPase in the plasma membrane could similarly maintain cell volume by creating a cell negative potential difference across the cell membrane, thus driving Cl− extrusion.
B. Volume Regulatory Ion Transport
As indicated above, ion transport across the cell membrane is the most efficient and rapid means of altering cellular osmolarity. During cell swelling, cells extrude ions, thus accomplishing RVD, whereas during cell shrinkage, cells accumulate ions to achieve RVI. The activation of ion release during RVD is paralleled by inhibition of ion uptake mechanisms, and the ion uptake during RVI is paralleled by inhibition of ion release mechanisms. Thus the simultaneous stimulation of ionic mechanisms for RVD and RVI is largely avoided (927938). A tremendous amount of work has been dedicated to the elucidation of the ion transport systems in different tissues. A synopsis of tissue-specific transport systems is beyond the scope of this review and has been reviewed in detail elsewhere (682).
1. Regulatory cell volume decrease
The transport systems most often activated by cell swelling are separate K+ and anion channels. In several studies, the anion channels activated by cell swelling have been found to be nonselective, allowing the passage not only of Cl− but also of HCO−3 (6901334) and even organic anions and neutral organic osmolytes (17657663210341169).
Obviously, different channel proteins from different families are utilized for cell volume regulation. Among the cloned K+ channels invoked to serve cell volume regulation are the Kv1.3 (N-type K+ channel) (273), the Kv1.5 channel (316), and the minK channel (150151). Cloned Cl− channels invoked in cell volume regulation include the ClC-2 channel (4355845857601203), BRI-VDAC (272), ICln (158439440910948949), and the P-glycoprotein (or MDR protein) (3624641015122512491250). Alternatively, P-glycoprotein (490532589590) and ICln (647) were suggested to regulate the volume regulatory Cl− channel. However, the role of P-glycoprotein in cell volume regulation has been questioned (141516025625766376498812171269). Clearly, many of the properties of cell volume regulatory anion channels are not explained by the known cloned channels (539), and additional anion channels must be operative. In addition, Na+(HCO−3)n cotransport may participate in RVD (1281). Apart from ion channels, the most frequently utilized transport system for KCl exit is electroneutral KCl cotransport (708–7109631206; for review, see Ref. 682). This transporter appears to be activated preferably by isotonic cell swelling (374). Some cells apparently release KCl by parallel activation of K+/H+ exchange and Cl−/HCO−3 exchange (103161). The H+ and HCO−3 exchanged for KCl form CO2 , which then diffuses out of the cell and is thus not osmotically active. Beyond that, the anion exchanger (AE1) has been implicated in activation of volume regulatory ion channels (374861).
Swelling of Na+-rich erythrocytes is thought to stimulate Na+ extrusion through reversal of Na+/Ca2+ exchange, and parallel extrusion of Ca2+ by the Ca2+-ATPase (932). Alternatively, evidence has been presented for the activation of ouabain-insensitive Na+-ATPase or Na+-K+-ATPase (850). Swelling has been shown to stimulate (1263) or inhibit (1342) the Na+-K+-ATPase. The gastric K+-H+-ATPase is stimulated by cell swelling (1113).
In many cells, swelling leads to the activation of nonselective cation channels (for review, see Refs. 68210401043). Because with the negative potential difference across the cell membrane the net driving force for cation movement is directed into the cell, ion movement through these channels cannot be expected to directly serve cell volume regulation. However, these channels allow the passage of Ca2+, which then enters the cells and activates Ca2+-sensitive K+ channels (18711941234).
Usually more cations (K+ and Na+) are lost from cells than Cl− (436476998). The difference is partially due to loss of HCO−3. Most HCO−3 lost is replaced by CO2 , and the H+ thus generated is bound to intracellular buffers. Thus the exit of HCO−3 is limited by the intracellular buffer capacity (346738). The HCO−3 that is replaced by CO2 does not directly contribute to cell volume regulation but allows the cellular loss of K+.
Osmotic cell swelling decreases the gap junctional conductance (8901002), an effect in part due to decrease of intracellular ion concentration.
Decreasing extracellular osmolarity activates Na+ channels in the frog skin (126226), urinary bladder (329740), and A6 cells (234), an effect, however, not related to cell volume regulation.
2. Regulatory cell volume increase
The major ion transport systems accomplishing electrolyte accumulation in shrunken cells are the Na+-K+-2Cl− cotransporter (294381) and the Na+/H+ exchanger (420). The latter alkalinizes the cell leading to parallel activation of the Cl−/HCO−3 exchanger. The H+ and HCO−3 exchanged for NaCl by the Na+/H+ exchanger and the Cl−/HCO−3 exchanger are replenished within the cell from CO2 , which diffuses into the cell and is thus osmotically not relevant.
Among the cloned members of the Na+/H+ exchanger family (1294), NHE-1 (266), NHE-2 (266601), and NHE-4 (107) are stimulated, whereas NHE-3 (8687266601) is inhibited by cell shrinkage. The putative volume-sensitive site at the NHE-1 molecule has been identified and is distinct from the sites regulated by Ca2+ and growth factors (86). The cloned anion exchanger AE2 but not AE1 is postulated to participate in RVI (587).
Several members of the volume regulatory Na+-K+-2Cl− cotransporters have been cloned (2653649519521370). In muscle cells, NaCl cotransport rather than Na+-K+-2Cl− cotransport is utilized for NaCl uptake (288). However, little is known about the volume regulatory role of the cloned NaCl cotransporters (365).
In some cells, electrolyte accumulation during RVI is accomplished by activation of Na+ channels and/or nonselective cation channels (15917712781332). The depolarization induced by the Na+ entry favors Cl− entry into the cell.
On the other hand, cell shrinkage has been shown to inhibit K+ and Cl− channels, preventing cellular electrolyte loss through those channels (for review, see Ref. 682). In several cell types, shrinkage has been observed to activate the Na+-K+-ATPase, which serves to replace accumulated Na+ with K+ (for review, see Ref. 682).
Some cells do not undergo RVI during exposure to hypertonic extracellular fluid. The same cells, if exposed to hypotonic extracellular fluid, show RVD, and if reexposed to isotonic fluid, first shrink and then display RVI (secondary RVI or RVI on RVD). In these cells, primary RVI is presumably prevented by increased intracellular Cl− activity, as detailed in section iiiI.
C. Osmolytes
The cellular accumulation of electrolytes after cell shrinkage is limited because high ion concentrations interfere with structure and function of macromolecules, including proteins (2513919219341349156457313761381). Furthermore, alterations of ion gradients across the cell membrane would affect the respective transporters. An increase of intracellular Na+ activity, for instance, would reverse Na+/Ca2+ exchange and thus increase intracellular Ca2+ activity, which would in turn affect a multitude of cellular functions (1226).
To circumvent the untoward effects of disturbed ion composition, cells produce so-called osmolytes, molecules specifically designed to create osmolarity without compromising other cell functions (3744141371384484629630714875113813771378). Unlike ions, organic osmolytes even at high concentrations are compatible with normal macromolecular function. Thus the term compatible osmolytes has been coined (129).
Three groups of osmolytes are used in mammalian cells: polyalcohols, such as sorbitol and inositol; methylamines, such as glycerophosphorylcholine and betaine; and amino acids and amino acid derivatives, such as glycine, glutamine, glutamate, aspartate, and taurine (14136837037162963071471972410771381). Tissue-specific utilization of the various osmolytes has been reviewed elsewhere in detail (682).
Osmolytes are specifically important for cell volume regulation in renal medulla, where extracellular osmolarity may become more than fourfold that of isotonicity (6264–669911214136939944245252566671872485510751076107813521353135613771378), and in the brain, where cell volume alterations cannot be tolerated due to the rigid skull and where alterations of ion composition would affect excitability (453524715–71774574691511551166116711701220122112661270).
Osmolytes not only replace ions as osmotically active species but also stabilize macromolecules, thus counteracting the adverse effects of inorganic (such as K+, Na+, and Cl−) and organic (such as spermine) ions (2613813921333466212711351). Furthermore, betaine and glycerophosphorylcholine, and to a lesser extent inositol, counteract the destabilizing effect of urea on proteins (145203384483750879966111913801382). For normal cell function, an appropriate balance must be maintained between destabilizing (i.e., ions, urea) and stabilizing (i.e., counteracting osmolytes) forces (19267807863127213761383). Accordingly, an increase of urea concentration specifically favors the parallel increase of glycerophosphorylcholine (723855966).
Beyond their function in cell volume regulation, osmolytes are protective against the destructive effects of excessive temperatures (342923523835345797599269891058116011931200) and dessication (169232). Furthermore, they have been found to ease cell membrane assembly (642).
Cellular osmolyte accumulation can be achieved by stimulated uptake, enhanced formation, or decreased degradation. Decrease of intracellular osmolyte concentration is accomplished by degradation or release. As compared with RVI accomplished by ions, accumulation of osmolytes is a slow process taking hours to days.
1. Glycerophosphorylcholine
Glycerophosphorylcholine (GPC) is formed by deacylation of phosphatidylcholine. The reaction is catalyzed by a phospholipase A2 , which is distinct from the arachidonyl-selective enzyme (370371). Glycerophosphorylcholine is broken down by the GPC phosphodiesterase, which degrades GPC to glycerol phosphate and choline (370371). Increase of osmolarity by extracellular addition of either NaCl or urea inhibits the phosphodiesterase and thus leads to accumulation of GPC (1243).
2. Sorbitol
Sorbitol is produced from glucose under the catalytic influence of aldose reductase (70321373), an enzyme that is distributed in various tissues (1041402173586147658561053–105511021198). The enzyme is upregulated by hypertonic extracellular addition of NaCl or raffinose, but not of membrane-permeable solutes, such as urea or glycerol. It is presumably an increase of cellular ionic strength that stimulates the aldose reductase transcription rate (4023037359985411301236). With continued hyperosmotic stress, the enzyme activity and thus sorbitol concentration increases slowly, approaching maximal values within 3 days (372). Osmolarity does not affect mRNA stability or enzyme degradation (39854). The half-life of the enzyme is ∼6 days (372). Cell swelling stimulates the release of sorbitol (393771345) through putative channels, which are thought to be inserted into the cell membrane by fusion of vesicles (629).
3. Inositol
Myo-inositol (inositol) is taken up into cells by a Na+-coupled transporter (81480666–6686701375). Increased cellular ionic strength (141) but not urea (878) stimulates the transcription of the transporter and thus cellular inositol accumulation (8771372). Similar to sorbitol, inositol is rapidly released from swollen cells (354630).
4. Betaine
Betaine is accumulated in cells by a Na+-coupled transporter (149119013721374). The carrier prefers γ-aminobutyric acid (GABA), which, however, is minimally available in extracellular fluid (1374). Increased cellular ionic strength (1242), but not urea (878), stimulates the transcription rate of the transporter and thus betaine accumulation (87687811911372). Betaine may further be accumulated by choline oxidation, which is, however, sensitive to cell shrinkage only in renal cortex (433758). After cell swelling, betaine is rapidly released (354630).
5. Taurine
Taurine is accumulated in cells by a Na+-coupled transporter (1239). The transcription of the transporter is stimulated by enhanced ionic strength, eventually leading to cellular taurine accumulation (12381240). After cell swelling, taurine is rapidly released, presumably through an anion channel (1025406326716726788471050108712381240) which is, at least in Ehrlich ascites tumor cells, distinct from the volume regulatory Cl− channel (677). In oocytes, expression of band 3-anion exchanger tAE1 confers volume regulatory taurine transport (324374861), but in mammalian cells, taurine efflux is not dependent on the presence of band 3 protein (1049). On the other hand, taurine transport is induced by the insertion of the peptide phospholemman (PLM) in lipid bilayers (845).
6. Amino acids
In addition to taurine, the cellular concentration of several other amino acids and amino acid metabolites is modified by cell volume, including glutamine, glutamate, glycine, proline, serine, threonine, β-alanine, (N-acetyl)aspartate, and GABA (for review, see Refs. 181682). Although the intracellular concentration of most individual amino acids is quite low, the sum of all amino acids significantly contributes to cellular osmolarity in cells exposed to isotonic extracellular fluid (714). Cell shrinkage stimulates Na+-coupled transport of neutral amino acids (18238011351373) and proteolysis (498) and inhibits protein synthesis (1159). Conversely, cell swelling inhibits proteolysis and stimulates protein synthesis (4984991159). Furthermore, cell swelling stimulates breakdown of glutamine and glycine (496500) as well as cellular release of several amino acids (540), at least partially through volume regulatory anion channels (176). Accordingly, cellular amino acid concentration increases upon cell shrinkage and decreases upon cell swelling (714). In fibroblasts, the major amino acid accumulated is glutamine (238239). Amino acids are probably important during adaptation to minor changes of extracellular osmolarity. Their contribution is, however, negligible for the adaptation to the excessive osmolarities in kidney medulla (714).
D. Further Metabolic Pathways Contributing to Cell Volume Regulation
In addition to amino acids, numerous organic metabolites contribute to cellular osmolarity. Several metabolic pathways known to be sensitive to cell volume may modify the concentrations of these metabolites and thus contribute to cell volume regulation. Cell swelling increases glycogen synthesis and inhibits glycolysis, thus decreasing the concentration of carbohydrate metabolites (124950696819953). Furthermore, cell swelling has a relatively weak stimulatory effect on lipogenesis (51). As detailed in section vC, cell volume changes interfere with a great number of other metabolic functions that to some extent may modify cellular osmolarity. The overall impact of these effects on cellular osmolarity is probably modest, but the influence of cell volume on various metabolic pathways is of paramount importance for regulation of metabolic function (see sect. vC).
III. INTRACELLULAR SIGNALING OF CELL VOLUME REGULATION
Cell swelling and shrinkage exert profound effects on intracellular signaling mechanisms, which in turn modify a multitude of cellular functions including the volume regulatory mechanisms. A great deal of experimental effort has been spent in elucidating the intracellular machinery underlying cell volume regulation. Frequently, the result has been inconclusive for several reasons. 1) Not every effect of altered cell volume on intracellular signaling is related to regulation of cell volume. 2) Cells usually use several mechanisms in parallel, with different, partially overlapping cellular signaling mechanisms. 3) Different cells utilize distinct mechanisms, i.e., the information gained in any given cell cannot necessarily be generalized to other cells. 4) Volume regulation requires mechanisms that are themselves not modified by cell volume changes but rather permissive for activation of cell volume regulatory mechanisms.
In the simplest case, an intracellular mechanism serves cell volume regulation if it is modified by alterations of cell volume, and a qualitatively and quantitatively identical modification of this intracellular mechanism triggers the appropriate alterations of cell volume. This requirement frequently is not met. If the identical modification does not trigger respective alterations of cell volume, the participation of a mechanism in cell volume regulation still cannot be ruled out, since the mechanism may require the collaboration of other mechanisms to be effective. Similarly, the use of inhibitors, even if they are specific, does not lead to conclusive results. On the one hand, inhibition of cell volume regulation by elimination of a given element of intracellular signaling (e.g., inhibition of protein kinases or removal of Ca2+) does not discriminate between volume regulatory and permissive mechanisms. On the other hand, cell volume regulation may prove insensitive to elimination of a volume regulatory mechanism if other mechanisms operating in parallel are strong enough to replace the defect. Further examples could be given, each of which illustrates that the experimental elucidation of the complex machinery serving cell volume regulation is extremely difficult.
Even though our understanding of the intracellular machinery mediating cell volume regulation is still incomplete, knowledge of the interaction between cell volume, elements of cellular signaling, and cell volume regulatory mechanisms is mandatory for understanding the role of cell volume for cell function.
A. Macromolecular Crowding
Cell swelling leads to dilution and cell shrinkage to concentration of cellular constituents including proteins. The concentration of intracellular proteins markedly influences their function (1313533768348369371011). In erythrocytes, the volume regulatory set point can indeed be varied by manipulation of intracellular protein concentration (8358371397). The set points of both the KCl symport (835838) and the Na+/H+ exchanger (209210940) appear to be determined by macromolecular crowding. It has been suggested that among the enzymes sensitive to ambient protein concentration is a kinase that is inactivated by protein dilution during cell swelling and activated by protein crowding during cell shrinkage (835838). This kinase may inhibit the volume regulatory KCl cotransport. Its inactivation during cell swelling would then disinhibit volume regulatory KCl efflux.
Because of interaction of proteins with ambient electrolytes, macromolecular crowding is reduced by increasing ionic strength, which indeed shifts the volume regulatory set point to smaller volumes (942).
Similarly, urea decreases the thermodynamic activity of proteins and thus reduces macromolecular crowding (2115747238379789841376). Urea has been shown to activate erythrocyte KCl transport (293596936), erythrocyte Na+/Ca2+ exchange (936), and hepatocyte K+ channels (474) and to inhibit Na+/H+ exchanger in erythrocytes (936) and adenosine 3′,5′-cyclic monophosphate (cAMP) production (58), Na+/H+ exchanger (732), and Na+-K+-2Cl− cotransport (595) in thick ascending limb cells, thus leading to cell shrinkage. In erythrocytes, the effect of urea was reversed by okadaic acid, pointing to the involvement of phosphorylation (936).
B. Cytoskeleton
1. Actin filaments
Obviously, cell swelling or shrinkage will affect the cytoskeletal architecture. In fact, actin filaments have been found to be depolymerized during swelling of a variety of cells (89220–22324147747852773683083184812091398), an effect which is at least partially due to Ca2+ (223). Calcium concentration increases in most cells after osmotic swelling (see sect. iiiF ). As a result, Ca2+ depolymerizes actin filaments by binding to gelsolin (11611327). Depolymerization could further result from degradation of phosphatidylinositol 4,5-bisphosphate, which inhibits depolymerization by interaction with profilin (703704). A transient depolymerization of the actin filaments may be followed by a polymerization of actin filaments (1398). In hepatocytes, polymerization of actin filaments prevails (1202) and is paralleled by expression of β-actin (10971202). The de novo actin biosynthesis is probably the result of actin polymerization, since it is inhibited by depolymerized actin (993).
Cytoskeletal elements may interfere in several ways with volume regulatory mechanisms. Actin filaments may inhibit osmotically driven water fluxes (566567) and thus retard osmotically induced cell volume changes. Beyond that, RVD is inhibited in several tissues by cytochalasin D (892212222242893403636197541258), which interferes with actin assembly (7811161). Moreover, expression of actin binding protein was required for RVD in melanoma cells (166). Thus an intact actin filament network is required for activation of at least some of the volume regulatory mechanisms. In fibroblasts, actin depolymerization reverses the shrinking effect of bradykinin into a swelling effect, again pointing to a role of actin filaments in cell volume control (10011004). Via other cytoskeletal elements, such as spectrin and ankyrin, actin filaments couple to membrane proteins, an interaction modified by cell volume changes. For instance, cell swelling stimulates binding of ankyrin to the anion exchanger band 3 protein (868). Another putative target of the actin filament network is a K+ channel that cannot be activated in isolated membrane vesicles devoid of cytoskeleton (423). Furthermore, it has been shown that actin filament fragments regulate Na+ channels (77), and it has been speculated that the cytoskeleton may participate in the insertion of cell volume regulatory channels into the plasma membrane (340741), in the regulation of channels by kinases (see sect. iiiH) and phospholipids (see sect. iiiK), and in the activation of channels by membrane stretch (1040). However, disruption of the actin network did not prevent activation of channels by cell membrane stretch (1133). Furthermore, the stimulation of taurine or inositol release during cell swelling was not affected by cytochalasin B (626848).
The depolymerization of the actin filament network may participate in the activation of a mechanosensitive anion channel (83211081227). Furthermore, depolymerization of submembranous actin filaments may facilitate the fusion of channel-containing vesicle membranes with the plasma membrane. Agonist-induced exocytosis has indeed been shown to be favored by actin depolymerization (32130147283954).
The cytoskeleton is further thought to be involved in the volume regulatory activation of the Na+/H+ exchanger (1064044311292), which does contain putative cytoskeletal binding sites (333). Actin depolymerization by either cell swelling or by addition of cytochalasin B, however, activates the Na+-K+-2Cl− cotransporter (541586813), and in vesicles devoid of cytoskeleton, the Na+-K+-2Cl− cotransporter is permanently active (541). This activation is counterproductive during the initial phase of cell swelling.
In addition to its role in regulation of ion transport, the cytoskeleton may mediate some effects of cell volume on gene expression (76529).
2. Microtubules
Cell swelling increases microtubule stability and stimulates the expression of tubulin (511).
Colchicine, which disrupts the microtubule network, inhibits RVD in Jurkat cells, HL-60 cells, and peripheral neutrophils (289), but not in Ehrlich ascites tumor cells (223), kidney cells (924), and gallbladder (340). In macrophages, disruption of microtubules was found to activate anion channels (821).
An intact microtubule network was found to be crucial for the influence of cell volume on alkalinization of intracellular vesicles (1561089), proteolysis (1561284), and taurocholate exit from liver cells (508).
C. Cell Membrane Stretch
A variety of ion channels are activated by cell membrane stretch, i.e., increased tension of the cell membrane (10401043). Stretch increases the open probability of the channels without affecting single-channel conductance or selectivity of the channels (1043).
The stretch-activated channels may be selective for K+ or for anions, thus directly serving cell volume regulation (8571043). Most of these channels, however, are nonselective cation channels, allowing the passage of K+, Na+, and Ca2+ (for review, see Refs. 6821043). Because of the cell-negative cell membrane potential, the respective electrochemical gradients favor the cellular accumulation of Na+ and Ca2+ rather than cellular loss of K+. Thus these channels are not likely to directly serve cell volume regulation, and inhibition of these channels by gadolinium has been shown to decrease osmotic swelling and favor regulatory decrease of cell volume (1173). On the other hand, Ca2+ entering the cells through these channels is thought to activate Ca2+-sensitive K+ channels (18711941234).
The mechanism linking membrane stretch to activation of the channels has not been clearly defined (1043). Under discussion are 1) release of fatty acids from the stretched membrane and subsequent activation of stretch-sensitive channels by these fatty acids (917) and 2) stretch-induced activation of some element of the cytoskeleton, such as spectrin (1133). Because stretch enhances channel open probability in the cell-free excised patch configuration (1043), cytosolic components are apparently not required for channel activation.
It is debatable whether stretch-activated channels participate in the fine-tuning of cell volume, since considerable stretch is required to activate these channels (1043). Possibly, these channels may represent a last line of defense against excessive cell swelling but are not involved in the response to moderate changes of cell volume.
D. Cell Membrane Potential
The influence of cell swelling on cell membrane potential depends on the ion channels preferentially activated or inactivated and on the potential difference before cell swelling. Activation of K+ channels and a low initial cell membrane potential favor hyperpolarization, whereas activation of anion or nonselective cation channels and a high initial cell membrane potential would favor depolarization. After cell swelling, hyperpolarization of the cell membrane is seen in hepatocytes (406), depolarization of the cell membrane in Ehrlich ascites tumor cells (680691), Madin-Darby canine kidney (MDCK) cells (947), opossum kidney cells (1235), lymphocytes (4184191060), pancreatic β-cells (124), astrocytes (627), neuroblastoma cells (313), and vascular smooth muscle cells (685). In some cells, a transient hyperpolarization due to activation of K+ channels is followed by a more sustained depolarization due to activation of anion channels (516–5181002).
The alteration of cell membrane potential may influence the activity of additional ion channels. A depolarization of the cell membrane may open voltage-sensitive ion channels. In lymphocytes, RVD involves n-type K+ channels (273429), which are activated by cell membrane depolarization. Depolarization of the cell membrane may further activate voltage-sensitive Ca2+ channels, as observed in pancreatic β-cells (124) and vascular smooth muscle cells (685). The increase of intracellular Ca2+ could trigger a variety of further mechanisms, as illustrated in section v, E and F.
As discussed in section iiB, increase of extracellular osmolarity may either depolarize or hyperpolarize cells due to activation of unspecific cation channels or inhibition of K+ and/or Cl− channels.
E. Cytosolic pH
Cell swelling leads to cytosolic acidification (2163974796106166857578641002108911431279), which has been explained by the exit of HCO−3 through anion channels (1334), by release of H+ from acidic intracellular compartments (see sect. iiiL), and by enhancement of Cl−/HCO−3 exchange due to decreasing cellular Cl− activity (757). This latter mechanism, however, should be impeded by inhibition of the exchanger at acidic cytosolic pH (645), and cellular acidosis is not inhibited by removal of extracellular Cl−, at least in osteosarcoma cells (864).
Cell shrinkage is frequently observed to alkalinize cells, at least partially due to activation of volume regulatory Na+/H+ exchange (see sect. iiB).
The impact of intracellular pH on volume regulatory mechanisms has not been explored. After cell swelling, the cytosolic acidification may impede activation of volume regulatory K+ channels (783) and may contribute to inhibition of glycolysis and thus to the decreased release of lactic acid (696). The alkalinization after cell shrinkage should stimulate glycolysis (696).
F. Calcium
After cell swelling, intracellular Ca2+ concentration ([Ca2+]i) increases in a variety of cells, whereas it remains apparently constant in others (for review, see Refs. 682815). Swelling may increase [Ca2+]i by both activation of Ca2+-permeable channels in the cell membrane and Ca2+ release from intracellular stores. Calcium-permeable channels may be activated by cell membrane stretch (see sect. iiiC ), cell membrane depolarization (see sect. iiiD), and/or protein kinase C (1066). Calcium release from intracellular stores is presumably triggered by inositol phosphates (5272118012881289) or Ca2+-induced Ca2+ release (516518). The regulation of [Ca2+]i by cell volume may interfere with signaling of Ca2+-recruiting hormones, as shown for gastric parietal cells (885) and HT-29 cells (330). In those cells, agonist-induced entry of Ca2+ was further stimulated by cell swelling (330885) and inhibited by cell shrinkage (885).
The increase of [Ca2+]i accounts for the activation of Ca2+-sensitive K+ channels, as shown in Ehrlich ascites tumor cells (188), MDCK cells (1334), proximal tubule cells (290605), thick ascending limb cells (1194), choroid plexus epithelial cells (187), and neuroblastoma cells (313). In MDCK cells, [Ca2+]i did not appreciably increase upon moderate osmotic cell swelling, even though the Ca2+-sensitive K+ channels were already activated by this treatment (1002). Possibly small, localized increases of [Ca2+]i are sufficient to activate the K+ channels but are not detected by fluorescence measurements (1357).
Despite the activation of Ca2+-sensitive K+ channels, RVD is apparently not mediated by a rise of [Ca2+]i in Ehrlich ascites tumor cells (1204), and swelling-induced K+ efflux was virtually unaffected by the inhibitors of the Ca2+-sensitive K+ channels, clotrimazole and charybdotoxin (489). Because these K+ channels are inwardly rectifying (1334), K+ exit through these channels during cell swelling may be limited by the depolarization of the cell membrane. Other less inwardly rectifying K+ channels may thus be more important for cell volume regulation in those cells (539). In a variety of tissues, increase of [Ca2+]i was not required for RVD (for review, see Ref. 682). Clearly, activation of K+ channels by Ca2+ may contribute to, but is frequently not crucial for, RVD (539).
In contrast to volume regulatory K+ channels in many tissues, volume regulatory Cl− channels have been found to be insensitive to Ca2+ in intestinal cells (517657), ciliary epithelial cells (1385), cardiac myocytes (1227), T84 colon carcinoma cells (11341364), airway epithelial cells (3611134), MDCK cells (4810291334), lymphocytes (421), Ehrlich cells (188), and chromaffin cells (287). Yet, as shown in Ehrlich ascites tumor cells, Ca2+ triggers the formation of leukotrienes, which do activate the channels (539). In kidney cortex, Ca2+-sensitive Cl− channels have been found in endosomes and proposed to serve cell volume regulation (991). Calcium is also thought to trigger the fusion of vesicles, allowing the release of sorbitol (629), whereas it is apparently not required for release of GPC (629) or taurine (1051).
Calmodulin antagonists and inhibitory peptides against Ca2+/calmodulin-dependent kinase (116) have been shown to inhibit RVD or activation of cell volume regulatory ion channels (71263421424543546815), and it has been concluded that calmodulin/Ca2+ complexes are important for activation of RVD. In other cells, however, Ca2+-sensitive K+ channels involved in cell volume regulation did not require calmodulin and were actually activated by calmodulin antagonists (950).
Beyond its putative role during RVD, calmodulin has been implicated in activation of the Na+-K+-2Cl− cotransport in RVI (583).
G. G Proteins
Inhibitors of G proteins such as pertussis toxin or cholera toxin have been shown to blunt the RVD (539) as well as swelling-induced osmolyte efflux (1037), increases of intracellular Ca2+ concentration (30), mitogen-activated protein kinase (MAPK) activity (8951072), vesicular acidification (1088), and swelling-induced stimulation of taurocholate excretion (895), suggesting that G proteins do mediate some effects of cell swelling. Activation of the Na+/H+ exchanger during cell shrinkage has similarly been claimed to involve G proteins (108249).
In addition to heterotrimeric G proteins, small G proteins have been implicated in cell volume regulation. Clostridium botulinus C3 exoenzyme, which depolymerizes the actin filament network by ADP-ribosylation of rho (8), blunts the volume regulatory anion efflux (1209). In neurons, osmotic cell shrinkage stimulates the expression of α1-chimerin (286), a GTPase-activating protein that inactivates the small G protein Rac. The impact of this effect on cell volume regulation is not explored.
H. Protein Phosphorylation
1. Cell swelling
Mechanical stress or cell swelling has been found to stimulate protein kinase C (9971017) to foster tyrosine phosphorylation of several proteins including focal adhesion kinase p125FAK (12091211), to stimulate phosphatidylinositol 3-kinase (PI 3-kinase) (1209), and to trigger MAPK cascades leading to the activation of Jun-NH2-terminal kinase (JNK) or extracellular signal-regulated kinases ERK-1 and ERK-2 (436048256856989510441072107311271211). Adenylate cyclase has been reported to be stimulated (8511324–1326) and inhibited (535) by cell swelling, and cAMP has been shown to inhibit volume regulatory Cl− channels in chicken hearts (468). Most recently, we have successfully cloned a cell volume-regulated serine/threonine kinase, the human serum glucocorticoid-dependent kinase h-sgk (1295). Expression of this kinase is rapidly upregulated by moderate cell shrinkage and markedly depressed by moderate cell swelling.
How these events link to activation of the various volume regulatory mechanisms is poorly understood. The volume regulatory KCl cotransport is activated by dephosphorylation and inactivated by phosphorylation (942955805815979201144). Swelling or increased hydrostatic pressure was suggested to inhibit a kinase, favoring dephosphorylation (94295386580), but nothing is known about the properties of this kinase, which appears to be distinct from protein kinases A and C (581). Some evidence indicates the involvement of the cytoskeleton in the swelling-induced inhibition of the kinase (539). On the other hand, the view that phosphorylation or dephosphorylation links cell swelling to activation of KCl cotransport has been challenged (1041).
The volume of a wide variety of cells is decreased by cAMP (see Table 2), an effect mainly due to activation of Cl− channels and K+ channels. To the extent that in those cells cAMP is increased after cell swelling, cAMP participates in cell volume regulation. Beyond that, cAMP has been postulated to shift the volume regulatory set point of the channel toward smaller volumes (823).
Additional experimental evidence points to the involvement of various kinases in volume regulation of different cell types. In intestinal cells, volume regulatory rubidium efflux was inhibited by herbimycin A and genistein, pointing to involvement of tyrosine kinase (1211). Swelling of Jurkat cells activates the src-like tyrosine kinase p56lck, which in turn accounts for the activation of the volume regulatory Cl− channels (727a). Wortmannin, an inhibitor of PI 3-kinase, similarly interferes with cell volume regulation in those cells (1209). In proximal tubules (1012–1014) and in HeLa cells (490), protein kinase C has been invoked to link cell swelling to activation of Cl− channels. Cell swelling leads to phosphorylation of the anion exchanger, which was postulated to release taurine (869).
In addition to its role in the phosphorylation of proteins, ATP may serve as a signaling molecule itself. The volume regulatory Cl− channel in collecting duct, glioma, and intestine 470 cells (9081277) as well as taurine efflux in skate hepatocytes and glioma cells (475751277) are apparently regulated by intracellular ATP concentration. Decreased ATP concentration, as it occurs during energy depletion, inhibited the channel. In pancreatic β-cells, cell swelling leads to activation of ATP-sensitive K+ channels (289a). Extracellular ATP has been shown to stimulate taurine release from tracheal cells (362). It has been speculated that after cell swelling ATP is extruded via the cystic fibrosis transmembrane conductance regulator and activates K+ channels and Cl− channels from the extracellular side (10301310). On the other hand, extracellular ATP has been shown to inhibit volume regulatory Cl− channels in intestinal cells (1228).
2. Cell shrinkage
Similar to cell swelling, osmotic cell shrinkage has been shown to activate protein kinase C (702), whereas cAMP formation (648) and cAMP-dependent phosphorylation have been shown to remain unaffected (13648). In several cell types, osmotic shrinkage stimulates the phosphorylation of myosin light chains, an effect presumably related to activation of Na+-K+-2Cl− cotransport (6359031188).
Excessive osmotic cell shrinkage, such as doubling of extracellular osmolarity, triggers several proteins involved in the MAPK pathways, such as Raf-1, MAPK kinase, MAPK, and ribosomal protein S6 kinase (8091197) or activation of JNK by the MAPK kinase MKK4 (853), which may be triggered by the tyrosine kinase Pyk2 through a pathway requiring activation of PI 3-kinase and the small G proteins Ras and Rac (1216). The activation of MAPK pathways may be secondary to clustering and internalization of cytokine receptors with subsequent activation of downstream targets (1020). On the other hand, the ribosomal protein S6 has been reported to be dephosphorylated upon osmotic cell shrinkage (656).
As shown in several tissues, cell shrinkage stimulates serine and threonine phosphorylation of the Na+-K+-2Cl− cotransporter (6367729279681219). Volume-regulated Na+-K+-2Cl− cotransport may be activated (812814968) or inhibited (728) by cAMP, and cAMP does not participate in activation of this carrier during cell shrinkage (381). The protein kinase C inhibitor chelerythrine (702), but not staurosporine (583919), inhibits volume regulatory Na+-K+-2Cl− cotransport, which may be activated (583) or inhibited (728) by phorbol esters. The involvement of protein kinase C in the activation of this carrier is thus a matter of debate.
Even though the Na+/H+ exchanger is activated by phosphorylation (88), phosphorylation of the carrier is not affected by cell shrinkage (430) and not required for activation (430). In Ehrlich ascites tumor cells, shrinkage-induced activation of the transporter has been reported to be blunted by inhibition of protein kinase C and stimulated by inhibition of phosphatases (956). In dog erythrocytes, inhibition of phosphatases shifted the set point of the Na+/H+ exchanger to higher volumes (941). However, protein kinase C appeared not to be involved in activation of the carrier in other tissues (108244422426427).
The role of MAPKs in triggering of cell volume regulatory mechanisms remains elusive, whereas their involvement in regulation of betaine transporter expression has been ruled out (669).
In yeast, histidine kinases are activated by enhanced osmolarity and trigger a cascade involving a MAPK-like protein (791). Up to now, attempts to identify a volume-regulated histidine kinase in mammalian cells have failed.
I. Chloride
As pointed out in section iiA, intracellular Cl− activity is kept low, and this counterbalances the high intracellular osmolarity created by organic substances. During osmotic cell swelling, intracellular Cl− activity is expected to decrease further due to H2O entry during the swelling phase and Cl− release during RVD. Intracellular Cl− activity is similarly expected to decrease during swelling by cumulative substrate uptake, but it should increase during swelling by depolarization of the cell membrane or after stimulation of Na+-K+-2Cl− cotransport.
Osmotic cell shrinkage is expected to increase intracellular Cl− activity due to cellular H2O loss during the shrinking phase and Cl− accumulation during RVI. On the other hand, intracellular Cl− activity should decrease during shrinkage caused by activation of ion channels.
Decreased intracellular Cl− activity is apparently required for full activation of Na+-K+-2Cl− cotransport during cell shrinkage (53954812451370). Beyond its influence on one of the driving forces of Na+-K+-2Cl− cotransport, a decreased intracellular Cl− concentration is thought to play a permissive role for the activation of both Na+-K+-2Cl− cotransport (1197347351009) and Na+/H+ exchange (1082509339341009). If extracellular osmolarity is made hypertonic by increased extracellular NaCl concentration, the increase of intracellular Cl− activity could thus impede RVI (539). Accordingly, some cells are unable to regulate their volume during exposure to hypertonic extracellular fluid (308437522539544545634). If intracellular Cl− is lowered by prior RVD (308420522634) or by activation of Cl− channels with cAMP (4371177) or vasopressin (3515191177), the same cells do accomplish RVI. Moreover, if cells are exposed to short-chain fatty acids, they swell by accumulation of the acids along with Na+ and are forced to release Cl− for RVD (see Table 2). In the presence of these acids, they display RVI after exposure to hypertonic extracellular fluid (1016).
Intracellular Cl− inhibits the glycogen synthase phosphatase (408), and the decrease of intracellular Cl− activity participates in the stimulation of glycogen synthesis during osmotic or glutamine-induced cell swelling (555819).
J. Magnesium
The dilution and concentration of intracellular solutes during cell swelling or shrinkage lead to the respective alterations of Mg2+ concentration. Magnesium has been described to inhibit volume regulatory KCl cotransport (78295). During cell swelling, the decrease of intracellular Mg2+ concentration may partially account for the activation of KCl cotransport (78295). Conversely, an increase of intracellular Mg2+ activity stimulates Na+/H+ exchange (944) and Na+-K+-2Cl− cotransport (794) and may thus participate in regulatory cell volume increase.
K. Eicosanoids
Cell swelling has been shown to activate phospholipase A2 (542800), possibly in part through decrease of macromolecular crowding (539). Metabolites of arachidonic acid include the products of cyclooxygenase (e.g., prostaglandins), 15-lipoxygenase (such as hepoxilin A3), 5-lipoxygenase [e.g., leukotriene (LT) D4], and epoxygenase (epoxyeicosatrienoic acids) (675). On the other hand, as shown in Ehrlich ascites tumor cells, swelling stimulates the formation of the leukotrienes, namely, LTD4 , at the expense of prostaglandins such as prostaglandin (PG) E2 (675). Both phospholipase A2 and 5-lipoxygenase are activated by Ca2+ (542675). Thus an increase of intracellular Ca2+ concentration during cell swelling could participate in the activation of these two enzymes during cell swelling. Along these lines, LTD4 may overcome the inhibitory effect of the calmodulin antagonist pimozide on cell volume regulation, suggesting that LTD4 is a signal downstream of Ca2+ (673).
Arachidonic acid has been shown to inhibit glial cell volume regulation (1052) and to inhibit volume regulatory Cl− channels (4036736791047). On the other hand, it may increase Ca2+ concentration in renal collecting duct and activate K+ channels in neurons (6221213). Moreover, the 15-lipoxygenase product of arachidonic acid hepoxilin A3 activates volume regulatory K+ channels in platelets (798–801), and the 5-lipoxygenase product LTD4 activates volume regulatory K+ and Cl− channels (547592674675679) and volume regulatory taurine release (592678) in Ehrlich ascites tumor cells, as well as taurine release in fish erythrocytes (1207). 5-Lipoxygenase products similarly appear to mediate regulatory cell volume decrease in colonic epithelium (277281282), chromaffin cells (287), MDCK cells (947), and human fibroblasts (808). However, in most of these cell types, the evidence comes largely from effects of 5-lipoxygenase inhibitors such as nordihydroguaiaretic acid (NDGA). In Ehrlich ascites tumor cells (679) and proximal renal tubules (Völkl and Lang, unpublished observations), on the other hand, the inhibitory effect of NDGA was not overcome by the addition of LTD4 , pointing to an additional effect of the drug not related to 5-lipoxygenase inhibition. It may more directly inhibit the volume regulatory Cl− channels (438) or be effective by increasing arachidonic acid concentration (1052).
The enhanced formation of leukotrienes in swollen Ehrlich ascites tumor cells parallels a decreased formation of PGE2 , an effect possibly accounting for the inhibition of Na+ channels (679). Those channels are thought to be stimulated by PGE2 (679). On the other hand, in ciliary epithelial cells, PGE2 was thought to mediate the activation of volume regulatory K+ channels during cell swelling (191). Prostaglandin E2 similarly activates K+ channels in MDCK cells (1153) and erythrocytes (743).
In collecting duct principal cells, inhibition of phospholipase A2 with quinacrine blunted the activation of volume regulatory Ca2+-sensitive K+ channels, which, on the other hand, were activated by arachidonic acid (751). In LLC-PK1 cells, however, volume regulatory rubidium flux was not modified by arachidonic acid, even though it was inhibited by an arachidonic acid antagonist (262).
Ketoconazole, an inhibitor of epoxygenase (cytochrome P-450), impedes volume regulatory efflux of osmolytes, such as sorbitol, betaine, myo-inositol, or amino acids from renal papillary cells (354), MDCK cells (38), and C6 glioma cells (8181171). However, the inhibitory effect is not reversed by addition of hydroxyeicosatetraenoic acids (818), indicating that the inhibitory effect on osmolyte flux is not due to inhibition of epoxygenase. Similarly, in Necturus gallbladder, ketoconazole does not prevent regulatory KCl efflux but stimulates NaCl entry, leading to cell swelling (615).
In addition to their influence on volume-sensitive ion channels, phospholipase A2 and a cytochrome P-450 product of arachidonic acid have been invoked in mediating the swelling-induced cellular release of sorbitol (354).
The fatty acid composition of the cell membrane can be modulated by dietary polyunsaturated fatty acids, which lead to enhanced formation of leukotrienes and thus to acceleration of RVD in Ehrlich ascites tumor cells (712).
L. pH in Acidic Cellular Compartments
As evidenced from acridine orange and fluorescein isothiocyanate-dextran fluorescence, hepatocyte swelling leads to alkalinization of acidic cellular compartments, whereas cell shrinkage enhances the acidity in those compartments (1566831088108912791280).
The lysosomal proteases are known to have their pH optimum in the acidic range, and alkalinization of the lysosomes is well known to inhibit hepatic proteolysis (859860). Thus the alkalinizing effect on acidic cellular compartments could at least in theory contribute to the antiproteolytic action of cell swelling. Along these lines, alkalinization of acidic cellular compartments parallels the cell swelling and antiproteolytic effect of transforming growth factor-β1 on LLC-PK1 cells (752). However, the contribution of vesicular alkalinization to the antiproteolytic effect of cell swelling remains to be proven. At least in liver cells, swelling alkalinizes prelysosomal rather than lysosomal compartments (7661090). Moreover, inhibition of tyrosine kinase by erbstatin interferes with prelysosomal alkalinization but not with inhibition of proteolysis (S. vom Dahl and D. Häussinger, unpublished observations), pointing to some antiproteolytic mechanisms independent of lysosomal pH.
The alkalinization of acidic cellular compartments in hepatocytes occurs not only if cell swelling is due to decrease of extracellular osmolarity but also if cell swelling is caused by inhibition of K+ channels and by concentrative uptake of amino acids (1279).
It appears that the influence of cell volume on pH of acidic cellular compartments is not confined to prelysosomes in hepatocytes but involves a number of distinct compartments in a great variety of cells, such as pancreatic β-cells, glial cells, neurons, vascular smooth muscle cells, proximal renal tubules, MDCK cells, alveolar cells, macrophages, and fibroblasts (153–15768410901283). Accordingly, the functions of these compartments may be modified by alterations of cell volume.
M. Gene Expression
Both cell swelling and cell shrinkage markedly influence the expression of a wide variety of genes (see Table 1).
| Effect | Gene/Gene Product Affected |
|---|---|
| Cell swelling | |
| + | c-jun in hepatocytes (328) |
| + | c-fos in cardiac myocytes (1044) |
| + | JNK-1 in cardiac myocytes (1044) |
| + | ERK-1,2 in cardiac myocytes (1044) |
| + | Ornithine decarboxylase in LLC-PK1 cells (75769), leukemia cells (977), CHO cells (761), and hepatocytes (1215) |
| − | TNF-α in macrophages (1392) |
| + | β-Actin (1202) |
| + | Tubulin (511) |
| Cell shrinkage | |
| + | Aldose reductase in MDCK cells and kidney medulla (3731130) |
| + | Na+-inositol cotransporter SMIT (1416701318) |
| + | Na+-betaine cotransporter BGLT1 (319878131913721393) |
| + | Na+-taurine cotransporter (1238123913201322) |
| + | ROSIT, putative osmolyte transporter (1323) |
| + | Amino acid transport system A (18238011351373) |
| + | α1-Subunit Na+-K+-ATPase (322) |
| + | P-glycoprotein (1333) |
| + | ClC-K1 in kidney (1241) |
| + | Serine/threonine kinase h-sgk (1295) |
| + | Egr-1 in MDCK cells (205206208) and cardiomyocytes (1361) |
| + | α1-Chimerin in neurons (286) |
| + | c-fos in MDCK cells (208), hypothalamic cells (396), and cardiomyocytes (1361) |
| + | Heat shock proteins (1120811161192) |
| + | Cyclooxygenase-2 (1391) |
| + | PEPCK (7138861317) |
| − | Tyrosine hydroxylase in PC12 cells (621) |
| − | Dopamine β-hydroxylase in PC12 cells (621) |
| + | Tyrosine aminotransferase (1317) |
| + | Tissue plasminogen activator in endothelial and HeLa cells (733) |
| + | αβ-Crystallin in lens and kidney (245) |
| − | Matrix metalloproteinase 9 (1031) |
| + | Matrix proteins in chondrocytes (1244) |
| − | Laminin B2 in mesangial cells (603) |
| + | Vasopressin (866) |
| + | CD9 antigen in MDCK and PAP-HT25 cells (1115) |
As indicated in section iiC, exposure of cells to enhanced extracellular osmolarity or ionic strength stimulates the expression of aldose reductase and the Na+-coupled transport systems for inositol, betaine, taurine, and amino acids. The function of these proteins serves cellular accumulation of osmolytes and thus reestablishes osmotic equilibrium and cell volume constancy (144). Moreover, cell shrinkage stimulates the expression of heat shock proteins that serve to stabilize the proteins and thus to counteract the detrimental effects of increased salt concentrations. The cell volume regulated kinase h-sgk (see sect. iiiH) is a putative element of the signaling cascade triggering cell volume regulation. Furthermore, cell shrinkage stimulates the expression of proteins with diverse functions not obviously related to RVI, such as P-glycoprotein, ClC-K1, and Na+-K+-ATPase α1-subunit, cyclooxygenase-2, the GTPase-activating protein for Rac α1-chimerin, the immediate early gene transcription factors Egr1–1 and c-Fos, vasopressin, phosphoenolpyruvate carboxykinase, tyrosine aminotransferase, tyrosine hydroxylase, dopamine β-hydroxylase, matrix metalloproteinase 9, and several matrix proteins (see Table 1).
Cell swelling similarly stimulates the expression of a variety of proteins including β-actin, tubulin, cyclooxygenase-2, extracellular signal-regulated kinases ERK-1 and ERK-2, JNK, the transcription factors c-Jun and c-Fos, ornithine decarboxylase, and tissue plasminogen activator (see Table 1).
Information on the mechanisms triggering altered gene expression remains scanty (1254). Some evidence points to involvement of the cytoskeleton (76). The expression of aldose reductase is regulated by a distinct osmolarity-responsive element (3203211036). The stimulation of c-fos expression by swelling of cardiac myocytes is apparently secondary to tyrosine phosphorylation (1044); the c-jun transcription after swelling of hepatocytes is at least partially the result of MAPK activation, followed by phosphorylation of c-Jun (89510721211). Cell volume changes modify phosphorylation of a histonelike nuclear protein (1057), and hypertonicity has been shown to alter the karyotype (1237).
In mice, a gene (rol) has been identified that renders erythrocytes resistant to osmotic lysis. The product of this gene is likely to be involved in the stimulation of volume regulatory K+ fluxes. However, the precise function of this gene remains elusive (318).
IV. CHALLENGES OF CELL VOLUME CONSTANCY
A multitude of mechanisms alter cell volume. They may do so by overriding the volume regulatory mechanims, by knocking them out, or by shifting their volume regulatory set point.
A. Alterations of Extracellular Osmolarity
In mammalian tissues, most cells are exposed to extracellular fluid with well-controlled osmolarity. A notable exception is the kidney medulla, where extracellular osmolarity may approach values exceeding isotonicity by a factor of >4 (1033). Any blood cell passing the kidney medulla experiences exposure to this high ambient osmolarity and subsequent return to isosmolarity within seconds. Medullary cells have not only to cope with this excessive extracellular osmolarity for prolonged periods but encounter rapid changes of osmolarity during transition from antidiuresis to diuresis, when medullary osmolarity rapidly decreases toward isosmolarity (63).
Less dramatic alterations of extracellular osmolarity occur during intestinal absorption, which exposes intestinal cells to anisosmotic luminal fluid and may modify portal blood osmolarity and liver cell volume (460).
Other tissues are exposed to altered extracellular osmolarity during a variety of disorders. Although moderate, these alterations are still highly relevant challenges to cell volume control.
Because Na+ salts (mainly NaCl) contribute >90% to extracellular osmolarity, a significant decrease of extracellular osmolarity is necessarily paralleled by hyponatremia. A variety of clinical conditions can lead to hyponatremia (2021908169051265). Hyponatremia may reflect an excess of water, either due to excessive oral load or due to impaired renal elimination, or a deficit of Na+ due to renal or extrarenal loss (906061264). In both cases, the hyponatremia reflects a decreased extracellular osmolarity, leading to cell swelling. Excessive water intake is seen in psychiatric disorders (22). Causes for impaired renal water elimination include inappropriate antidiuretic hormone (ADH) secretion, glucocorticoid deficiency, hypothyroidism, and renal and hepatic failure. Renal and/or extrarenal loss of Na+ may result from mineralocorticoid deficiency, salt losing kidney, nephrotic syndrome, osmotic diuresis, vomiting, and diarrhea (90). Moreover, a wide variety of drugs including diuretics, cyclooxygenase inhibitors, and certain central nervous system active drugs may lead to hyponatremia due to loss of Na+ and/or to retention of water (90). Hyposmolar hyponatremia is further observed after burns, pancreatitis, and crush syndrome (90).
Hyponatremia does not necessarily indicate hyposmolarity but may occur in isosmolar or even hyperosmolar states (90). Extracellular osmolarity may be enhanced despite normal or even decreased extracellular Na+ concentration during hyperglycemia in uncontrolled diabetes mellitus (27) and ethanol poisoning (1010). Moreover, hyponatremia cannot be equated with cell swelling. As detailed in section ivF, cell swelling or cell shrinkage may prevail in diabetes mellitus. Burns, pancreatitis, and severe trauma, all conditions associated with hyponatremia (see above), may actually lead to muscle cell shrinkage rather than cell swelling (507).
Extracellular osmolarity is increased in hypernatremia, due to excessive oral intake and/or renal retention of Na+ and/or renal and extrarenal loss of water (3255538581142). Causes include excessive sweating, osmotic diuresis, lack of ADH or defective renal response to ADH, and drinking of seawater (553).
Even though extracellular osmolarity increases due to accumulation of urea in uremia (803), urea easily passes cell membranes and does thus not usually cause osmotic gradients across the cell membrane. Nevertheless, as shown in several cell types, high extracellular urea concentrations may trigger cell shrinkage by modifying the set point for volume regulatory mechanisms (see sect. iiiA). Cell shrinkage may be the signal for increase of osmolyte concentration in the brain, which has been observed to parallel enhanced urea concentration in uremia (1223).
Rapid correction of chronically enhanced osmolarity may lead to cell swelling, namely, to cerebral edema (281157). Chronic increases of extracellular osmolarity are compensated by cells through accumulation of osmolytes, which may not be rapidly readjusted. Cerebral betaine, inositol, and glycerophosphorylcholine, for instance, may remain enhanced for days after correction of extracellular hypertonicity (7461208). Conversely, rapid correction of hyponatremia may prove similarly harmful (11411156).
B. Alterations of Extracellular Ion Composition
Even at constant extracellular osmolarity, cell volume constancy may be challenged by altered extracellular ion composition (see Table 2).
Most importantly, an increase of extracellular K+ concentration depolarizes the cell membrane and eventually leads to cellular uptake of K+ with accompanying anions (mainly Cl− and HCO−3) and subsequent cell swelling. Conversely, a decrease of extracellular K+ could result in cell shrinkage due to cellular loss of KCl (see Table 2).
An increase of extracellular HCO−3 concentration could swell cells by electrogenic entry, hyperpolarization, reduced driving force for K+ exit, and subsequent accumulation of KHCO3 (976). During correction of extracellular acidosis in the course of the treatment of diabetic ketoacidosis, increasing extracellular pH allows the cells to extrude H+ through the Na+/H+ exchanger, similarly leading to cell swelling (1255).
Several organic anions such as acetate, lactate, and proprionate swell cells by entry of the unionized acid, intracellular dissociation, stimulation of Na+/H+ exchange by cytosolic acidosis, and subsequent accumulation of Na+ and organic anions (see Table 2). A similar effect is exerted by CO2 . In general, acidosis favors cell swelling, whereas cellular alkalosis has the opposite effect (see Table 2). Along these lines, the cellular accumulation of lactate in muscle exercise triggers volume regulatory mechanisms (1048).
Isotonic replacement of Cl− with gluconate leads to cell shrinkage due to cellular loss of Cl− (and K+) (see Table 2).
C. Energy Depletion
As pointed out in section iiB, the maintenance of a constant cell volume requires the expenditure of energy to fuel the Na+-K+-ATPase, which is required to establish the ionic gradients across the cell membrane. Inhibition of Na+-K+-ATPase by ouabain or during ischemia eventually leads to cell swelling. In cardiac myocytes, the swelling is preceded by transient cell shrinkage due to increase of intracellular Ca2+ and hypercontraction (311741131).
As would be expected, ischemia leads to swelling of the brain (3471229) by impairment of Na+-K+-ATPase and subsequent accumulation of NaCl (347593). However, according to in vitro studies on glial and neuronal cells, energy depletion alone does not result in cell swelling (356137751396). Rather, additional factors such as the intracellular acidosis (915786111299) may account for cell swelling observed during ischemia (625). Furthermore, cell swelling in cerebral ischemia is favored by an increase of extracellular K+ concentration (612) and by extracellular accumulation of glutamate (421396), which stimulates cationic channels through N-methyl-d-aspartate (NMDA) receptors and leads to subsequent accumulation of Na+, depolarization, and uptake of Cl− (185186). In the heart, recovery from ischemia is facilitated in the presence of the Na+/H+ exchange inhibitor 3-methylsulfonyl-4-piperidinobenzoyl-guanidine-mesilate (HOE-694) (1085).
Alterations of cell volume are encountered during cryopreservation of organs (366394681). Low temperatures inhibit the Na+-K+-ATPase and may thus be expected to eventually result in cell swelling.
D. Ion Transport Altered by Hormones and Transmitters
As listed in Table 2, a wide variety of hormones has been shown to alter cell volume.
Most importantly, insulin swells hepatocytes by activation of both Na+/H+ exchange and Na+-K+-2Cl− cotransport (4472953), and glucagon shrinks hepatocytes, presumably by activation of ion channels (47312861287). The effect of these hormones on cell volume accounts for several of the effects on hepatocyte metabolism (50450612861287). It should be pointed out that insulin and glucagon modify cell volume at hormone concentrations well encountered under physiological conditions. This is not necessarily true for all hormones listed in Table 2. Similar to insulin, several growth factors increase cell volume in a variety of cells by stimulation of Na+/H+ exchange and in some cases of Na+-K+-2Cl− cotransport (see Table 2). An increase of cell volume appears to be required for cell proliferation (see sect. vI).
Activation of Na+ channels or nonselective cation channels by excitatory neurotransmitters such as glutamate tends to swell neurons, whereas activation of K+ channels or anion channels by inhibitory neurotransmitters such as GABA tends to shrink neurons (see Table 2).
Secretagogues may stimulate transepithelial transport by enhancing cellular ion entry, ion exit, or both. If stimulation of ion entry prevails, the cells swell, whereas if ion exit is preferentially activated, the cells shrink. Thus secretagogues may either swell (e.g., epinephrine) or shrink (e.g., acetylcholine) the cells (see Table 2).
In kidney medulla, ADH enhances extracellular osmolarity and thus forces the medullary cells to accumulate osmolytes (10331075). Furthermore, ADH may more directly trigger the formation or accumulation of osmolytes (880).
E. Substrate Transport
The transport and cellular accumulation of amino acids lead to cell swelling (Table 2). Especially Na+-coupled transport processes can generate large chemical gradients across the cell membrane, due to the steep electrochemical gradient for Na+. For instance, cellular glutamine has been observed to increase by >30 mM after the addition of 3 mM glutamine to portal blood (502).
As listed in Table 2, transport of several other substrates such as glucose, taurine, and taurocholeate similarly increases cell volume.
F. Metabolism
In theory, any reaction resulting in an increase of osmotically active substances, such as degradation of proteins to amino acids, glycogen to glucose phosphate, or triglycerides to glycerol and fatty acids, may be expected to create intracellular osmolarity. However, very little is known about the influence of metabolism on cell volume.
Exercising muscle may lead to cellular accumulation of lactate and thus may increase cell volume (1048). The developing intracellular acidosis may compound cell swelling by activation of the Na+/H+ exchanger.
Diabetic ketoacidosis may cause cell swelling (1251976461388) due to cellular uptake of acids and enhanced Na+/H+ exchange activity in compensation for cellular H+ generation (1255). More importantly, high glucose concentrations favor cellular formation and accumulation of sorbitol through aldose reductase (1431805597489901196). As a consequence, cells decrease other osmolytes such as myo-inositol (14341110791158122213861387), an effect which can be reversed by inhibition of aldose reductase with sorbinil (3033261218). On the other hand, hyperglycemia is paralleled by hyperosmolarity, which shrinks cells. In fact, some evidence points to shrinkage of polymorphonuclear lymphocytes in hyperosmolar diabetes mellitus (269).
In addition to creating osmotically active substances, metabolic pathways may alter cell volume indirectly through modification of transport processes across the cell membrane. For instance, a decrease of cellular ATP could activate ATP-sensitive K+ channels and thus shrink susceptible cells, a possibility which has, however, not yet been explored. On the other hand, the cellular formation of peroxides has been shown to shrink hepatocytes due to activation of K+ channels at the cell membrane (1045). Peroxides similarly activate K+ channels in pancreatic β-cells (652) and vascular smooth muscle cells (651) but inhibit N-type K+ channels in lymphocytes (1183) and minK channels (152), which are expressed in a variety of cells (150). In endothelial cells, peroxides inhibit Na+-K+-2Cl− cotransport (305). However, the consequences on cell volume have not been tested in any of those cells.
G. Others
In addition to hormones, a great number of drugs and toxins lead to cell swelling or cell shrinkage (Table 2). For most substances, the functional significance of the effect on cell volume has not been explored.
In several stress situations, such as surgical intervention (306), acute pancreatitis (1027), severe injury, burns, and sepsis (79), a decrease of muscle intracellular space has been observed, leading to disinhibition of proteolysis and thus to hypercatabolism (507). However, the mechanisms underlying muscle cell shrinkage have not yet been elucidated.
V. ROLE OF CELL VOLUME REGULATORY MECHANISMS IN CELL FUNCTIONS
A. Erythrocyte Function
Erythrocyte volume and shape are important determinants of blood viscosity. Cell volume regulatory mechanisms are specifically important in limiting alterations of cell volume during their passage through the hypertonic kidney medulla and during HCO−3 transport in the lung and the periphery. One disorder exacerbated by altered erythrocyte cell volume regulatory mechanisms is sickle cell anemia, where mutations of the hemoglobin chain (HbS) favor the polymerization of deoxygenated hemoglobin, leading to characteristic changes of cell shape (sickling) and impaired deformability of the erythrocytes (591737); the consequence is a severe increase of blood viscosity (591). The polymerization of hemoglobin is highly dependent on protein concentration and thus on cell volume (297298). In HbS erythrocytes, volume regulatory KCl cotransport (1331631643431276) is enhanced, partially due to direct interaction with the mutated hemoglobin (914). Furthermore, cell shrinkage is presumably favored by enhanced activity of Ca2+-sensitive K+ channels (105134343) due to increase of intracellular Ca2+ concentration. The ensuing cell shrinkage further favors the polymerization of hemoglobin (591). The expression of the Na+/H+ exchanger is enhanced, possibly in compensation for cell shrinkage (165). Similarly, cell volume is decreased in homozygous hemoglobin C disease (135).
B. Epithelial Transport
Transcellular ion transport in epithelia is accomplished by entry mechanisms across one cell membrane and ion exit mechanisms at the other cell membrane. Obviously, the entry or extrusion of osmotically active substances during epithelial transport represents a continuous challenge to cell volume constancy.
In intestine, gallbladder, and renal proximal tubules (see Fig. 1A), the luminal uptake of substrates for Na+-coupled transport, such as glucose or amino acids, tends to swell the cells, leading to volume regulatory activation of K+ channels in the basolateral cell membrane (67681221733554936876927067829951092–10961230). The activation of these channels not only limits cell swelling but maintains the electrical driving force for continued transport. Fig. 1.Three examples illustrating role of cell volume in coupling of apical to basolateral cell membranes in epithelia. A: Na+-coupled transport across apical cell membrane of proximal renal tubules leads to accumulation of Na+ and substrate [e.g., amino acids (AA)] and thus to cell swelling, which activates basolateral K+ channels. B: electrolyte uptake by Na+-K+-2Cl− cotransport across basolateral cell membrane in dark vestibular cells leads to cell swelling and subsequent activation of luminal K+ channels. C: stimulation of apical Cl− channels in Cl−-secreting cells leads to loss of Cl− and, because of depolarization, of K+. Cell shrinkage and decrease of intracellular Cl− activity in turn stimulate basolateral Na+-K+-2Cl− cotransport.
In the NaCl-reabsorbing thick ascending limb of Henle's loop and diluting segment of the amphibian kidney, NaCl entry is accomplished by luminal Na+-K+-2Cl− cotransport, basolateral Cl− channels, and Na+-K+-ATPase as well as apical and basolateral K+ channels (4169001178). Inhibition of Na+-K+-ATPase leads to rapid cell swelling, which is prevented by inhibition of luminal Na+-K+-2Cl− cotransport (4445201178). On the other hand, stimulation of transport by ADH involves a well-coordinated increase of transport rate across both luminal and basolateral cell membranes (521) without any appreciable increase of cell volume (519). If the cells are shrunk by increased extracellular osmolarity, they do not display RVI unless they are stimulated with ADH or cAMP (5205221177). The hormone not only activates luminal Na+-K+-2Cl− cotransport but also a Na+/H+ exchanger in the basolateral cell membrane, which contributes to ion accumulation during RVI (5205221177).
Potassium secretion in dark vestibular cells (see Fig. 1B) and stria vascularis marginal cells of the inner ear is accomplished by basolateral Na+-K+-2Cl− cotransport, Na+-K+-ATPase, and Cl− channels as well as apical minK channels (1311). The K+ channels are activated by cell swelling (11201312), and the basolateral Na+-K+-2Cl− cotransport by cell shrinkage (1315). Cell volume couples the two cell membranes, since excess Na+-K+-2Cl− cotransport would swell the cells and thus activate the apical K+ channels, and excess K+ channel activity would shrink the cell and thus turn on Na+-K+-2Cl− cotransport. Moreover, exposure of the basolateral side to a hypotonic medium stimulates transepithelial transport (1312), possibly by decreasing intracellular Cl− and subsequent activation of Na+-K+-2Cl− cotransport.
In tight epithelia reabsorbing Na+, such as urinary bladder, Na+ entry through luminal Na+ channels is similarly coordinated with Na+-K+-ATPase and K+ channels at the basolateral cell membrane (1793297427899951232123313031349). Accordingly, inhibition of the Na+-K+-ATPase in toad urinary bladder leads to parallel inhibition of luminal Na+ channels, preventing luminal Na+ entry and cell swelling (252).
In several tight epithelia, insertion of Na+ channels was stimulated by decrease of extracellular osmolarity (12311347), a function obviously serving Na+ homeostasis rather than cell volume regulation.
Activation of K+ and Cl− channels during stimulation of secretion in several epithelia (Fig. 1C) may lead to cell shrinkage due to cellular KCl loss (2293383398731363). Shrinkage then turns on volume regulatory Na+/H+ exchange and/or Na+-K+-2Cl− cotransport, which may partially recover cell volume and at the same time supply the cell with further Cl− for secretion (341549796797).
Thus, during both reabsorption of Na+ and substrates and secretion of Cl−, cell volume participates in the coupling of the basolateral and luminal cell membrane, the so-called cross-talk between the opposing cell membranes (995). It should be kept in mind, however, that cell volume participates in, but does not fully account for, the coupling of the cell membranes (687). Accordingly, even though osmotic cell swelling mimics many effects of swelling induced by substrate transport, the underlying mechanisms are not necessarily identical. For instance, the depolarization resulting from Na+-coupled transport alkalinizes the cytosol by impairment of HCO−3 exit (687), whereas osmotic cell swelling leads to cytosolic acidification (see sect. iiiE). Because K+ channels are highly sensitive to cytosolic pH (692), their activation is expected to be different between osmotic and substrate-induced cell swelling. In enterocytes, RVD apparently depends on Ca2+ from outside and calmodulin-sensitive K+ channels, whereas substrate-induced cell swelling appears to be counterregulated by cellular Ca2+ release and subsequent activation of Cl− channels by protein kinase C (782788).
Volume-mediated activation of transporters not only involves ion channels and ion transporters. As pointed out above, cell shrinkage stimulates the expression and/or activity of Na+-coupled transporters for inositol (877), betaine (12421372), taurine (1238), and neutral amino acids (18238011351373). Cell swelling, on the other hand, stimulates cellular release of the above osmolytes and of glutathione (503) and cellular uptake of alanine and glutamine (5021335) and of taurocholate (469497). Stimulation of osmolyte flux during alterations of cell volume serves to regulate cell volume rather than transepithelial transport, but entry and/or exit may be polarized (3774806301372), and in the liver, cell swelling indeed stimulates transepithelial transport of taurocholate (469508) and leukotrienes (1340).
Hyperosmolarity stimulates urea transport (392393) but inhibits transport of NaCl in inner medullary collecting duct (410) and salivary gland (874).
Stimulation of transport during cell swelling may be the result of insertion of the carriers and/or channels into the cell membrane by exocytosis (11413246249791296912601354). Exocytosis may be stimulated by an increase of intracellular Ca2+ activity. In lung alveolar type II cells, the increase of intracellular Ca2+ concentration due to mechanical stress not only accounts for exocytosis but also for stimulation of surfactant secretion (1354). Protein secretion in seminal vesicles, on the other hand, is inhibited by both hyper- and hypotonic extracellular fluid (554). Exposure of the apical side of the pulmonary epithelium to hypotonic fluid is thought to stimulate the secretion of a humoral factor, leading to bronchodilation (367).
Whether the polarized trafficking of vesicles in epithelia is influenced by cell volume has not yet been explored. The polarized distribution of secretory proteins is modified by an alkalinization of vesicular pH (167931) and could thus theoretically be sensitive to cell volume. However, the alkalinization of vesicles during cell swelling may be too small to significantly interfere with trafficking.
In addition to its effect on transcellular transport, cell volume has been demonstrated to modify the permeability of tight junctions and thus paracellular transport. However, the reported effects are not consistent (2911140293096213481384).
C. Regulation of Metabolism
As listed in Table 3, cell volume changes modify a wide variety of metabolic functions. Most importantly, cell swelling favors the synthesis and inhibits the degradation of proteins, glycogen, and to a lesser extent lipids (504506). Cell shrinkage has the opposite effect. Thus cell swelling can be considered as an anabolic signal, whereas cell shrinkage favors cell catabolism.
| Effect | Process Affected |
|---|---|
| + | Glycogen synthesis in hepatocytes (412505153455456555819953) and muscle (762) |
| − | Glycogenolysis (406696) |
| − | Glucose-6-phosphatase activity (409) |
| + | Glucokinase activity in hepatocytes (1261) |
| − | Glycolysis in muscle and fibroblasts (196918) |
| + | Glycolysis in hepatocytes (953) |
| Macrophages and lymphocytes (1366) | |
| + | Lactate uptake in hepatocytes (696) |
| + | Pentose phosphate shunt in hepatocytes (4961046) |
| − | Release of glutamine and alanine from muscle (945) |
| + | Protein synthesis in hepatocytes (10071159), HeLa cells (10081343), and mammary cells (825) |
| − | Proteolysis in hepatocytes (471472498499767128412851287) |
| + | Amino acid uptake (100500502) |
| + | Glutamine breakdown in liver (502), lymphocytes, and macrophages (1366) |
| − | Glutamine synthesis (502) |
| + | Glycine and alanine oxidation (496510676) |
| + | Urea synthesis from amino acids (505) |
| − | Urea synthesis from NH+4 (500502) |
| + | Glutathione (GSH) efflux (503) |
| − | GSSG release into bile (1046) |
| + | Ornithine decarboxylase activity and expression (7691215) |
| + | RNA and DNA synthesis in HeLa cells (1008) |
| + | Ketoisocaproate oxidation (510) |
| + | Acetyl CoA carboxylase (495153555) |
| + | Lipogenesis (51) |
| − | Carnitine palmitoyltransferase I activity (4578411389) |
| + | Taurocholate excretion into bile (469497508) |
| + | Respiration in glial cells (609) and sperm (231) |
| − | Cellular ATP concentration in hepatocytes (820) |
| − | Phosphocreatine concentrations in glioma cells (747) |
| + | Formation of active oxygen species in neutrophils (658659) |
| + | Bile secretion (497) |
In hepatocytes, the influence of cell volume on metabolism is one way that insulin and glucagon exert their metabolic effects. Insulin increases liver cell volume by activation of Na+/H+ exchange and Na+-K+-2Cl− cotransport and thus triggers a variety of metabolic functions, including protein and glycogen synthesis and inhibition of protein and glycogen degradation (4504506). The effect of insulin on proteolysis is fully accounted for by the cell swelling effect of the hormone. Conversely, glucagon and cAMP stimulate proteolysis and glycogenolysis and inhibit protein synthesis in part by cell shrinkage due to activation of ion channels and subsequent release of KCl (504). Although cell shrinkage correlates well with the inhibitory effect of cAMP and ADH on protein synthesis, this is not true for the effects of insulin and phenylephrine (1159). Thus cell volume may play a less prominent role in hormonal regulation of protein synthesis than in proteolysis. The same probably holds true for glycogen metabolism and lipogenesis.
The antiproteolytic effect of cell swelling depends on an intact microtubule network (1561284) and could thus not be reproduced in freshly isolated hepatocytes (820), which suffer from a disintegrated microtubule network (5111284).
The set points of volume regulatory mechanisms and thus cell volume can be altered by a wide variety of other hormones and transmitters, which thus trigger the metabolic pattern typical for swollen or shrunken cells (Table 1). By this means, the mediators exploit volume regulatory mechanisms to exert their effects on cellular metabolism.
In addition to hormones, nutrients may modify protein, glycogen, and lipid metabolism in part through their influence on cell volume. In fact, the antiproteolytic effect of glutamine and glycine in liver has been shown to be completely accounted for by their influence on cell volume (471). The antiproteolytic and swelling effect of glycine is potentiated after starvation (4711285), which upregulates the glycine transporting system A (515). However, the antiproteolytic action of other amino acids such as phenylalanine, serine, alanine, and proline cannot be fully explained by their effects on cell volume. Thus mechanisms other than cell swelling contribute to the antiproteolytic action of some amino acids.
The influence of cell volume on metabolism is not restricted to macromolecular synthesis and breakdown. Swelling of hepatocytes apparently interferes with the transfer of reducing equivalents through the mitochondrial malate/aspartate shuttle (503). The lack of aspartate impedes the formation of urea from NH3 , an effect that is overcome by addition of lactate and pyruvate, allowing the mitochondrial regeneration of oxaloacetate (503). The formation of urea from glutamine is enhanced after cell swelling (500).
Some effects of cell swelling caused by a decrease of extracellular osmolarity may actually be due to concomitant mitochondrial swelling (969) because of decreasing ambient osmolarity. Glutamine breakdown (502) and glycine oxidation (510), for instance, are stimulated not only by decrease of extracellular osmolarity but also by glucagon, cAMP, and several Ca2+-mobilizing hormones that swell mitochondria (465–467), but at the same time shrink hepatocytes (see Table 2). Similarly, the swelling-induced decrease of the β-hydroxybutyrate-to-acetoacetate ratio (510) is probably due to stimulation of the respiratory chain due to concomitant mitochondrial swelling (274466).
Peroxides may modify cell volume by activation of ion channels (see Table 2). They shrink hepatocytes by activation of K+ channels (470). On the other hand, superoxide has been shown to swell erythrocytes (1247). Cell volume in turn influences the peroxide metabolism; cell swelling stimulates and cell shrinkage inhibits flux through the pentose phosphate pathway and NADPH generation (1046). Thus cell swelling provides NADPH for glutathione reductase to produce reduced glutathione (GSH) and strengthens the protective mechanisms against peroxides (1046). On the other hand, cell swelling should favor the formation of reactive oxygen species by NADPH oxidase, which is inhibited by high osmolarity (1186). Furthermore, components of the cytosolic burst oxidase have been found to be dissociated by high osmolarity (573). Moreover, cell swelling stimulates formation of arachidonic acid (see sect. iiiK), which is required for activation of NADPH oxidase (526). Accordingly, osmotic cell swelling stimulates (602) and osmotic cell shrinkage inhibits formation of peroxides in neutrophils (602659795810).
The enhanced formation of sorbitol in diabetes mellitus (see sect. ivF) has been implicated in the generation of several diabetic complications such as neuropathy, retinopathy, microangiopathy, and cataracts (143). Similarly, the cellular accumulation of galactitol with subsequent decrease of other osmolytes has been implicated in the pathophysiology of galactosemia (80302). However, the mechanisms linking cell swelling with defined sequelae of diabetes mellitus or galactosemia are far from understood.
Information on metabolic effects of cell volume in mammalian cells other than hepatocytes is still scarce (see Table 3), even though it appears highly unlikely that the influence of altered cell volume on metabolism is restricted to hepatocytes. For instance, mechanical or osmotic deformation of chondrocytes or osteoblasts, respectively, may stimulate the synthesis of proteoglycans and proteins (1236231244) and thus foster cartilage and bone growth, which indeed correlated with chondrocyte volume (661). Moreover, a decrease of muscle cell volume was correlated with hypercatabolism in several clinical conditions (507).
Certainly, more experimental information is needed on the interaction of cell volume and cell metabolism in other cells, such as glial cells and adipocytes.
D. Receptor Recycling
The formation of coated pits and internalization of low-density lipoproteins (LDL) and transferrin receptors are inhibited by both increase of extracellular osmolarity (246485531644909) and K+ depletion (485700701), both maneuvers expected to shrink cells. Conversely, internalization of LDL or ferritin is increased by hypotonic extracellular fluid (644707). However, because almost identical effects were exerted by KCl and NaCl but not by glucose or urea, the altered internalization appeared to be due to the ionic strength rather than cell volume (644). Increased ionic strength may impede internalization by interference with the formation of coated pits (531). On the other hand, cell swelling has been shown to inhibit endocytosis (1316).
Cell swelling leads rather to cytosolic acidification (see sect. iiiE), which has been shown to interfere with endocytosis from coated pits (4855301056). Moreover, cell swelling reverses lysosomal acidification, which is a prerequisite for normal recycling of LDL (57) and transferrin receptors (248). Accordingly, cell swelling would have been expected to impede receptor recycling. The vesicular alkalinization and cytosolic acidification after cell swelling may not be sufficient to significantly interfere with receptor recycling, and the effects of ionic strength exceed the weak effects of cell volume. The reason for the interference of K+ depletion with the formation of coated pits (701) remains, however, unexplained.
In glial cells, NH3 , which swells the cells (10897898) and alkalinizes their lysosomes (153), leads to upregulation of peripheral type benzodiazepine receptors (571572). Moreover, binding of benzodiazepine to glial cells (570), muscarinic drugs to peritoneal cells (537), atrial natriuretic peptide to collecting duct cells (561), and endothelin to renal cells (1268) increases after hypotonic exposure. Excessive osmotic shrinkage, on the other hand, has been shown to induce clustering and internalization of cytokine receptors and thus to mimic effects of the ligands (1020).
Taken together, these data do not suggest a uniform influence of cell volume as such on the regulation of cell membrane receptors.
E. Hormone and Transmitter Release
An increase in cell membrane tension, as occurs during cell swelling, has been described to trigger fusion of endocytotic vesicles with the plasma membrane, leading to release of vesicle contents and insertion of ion channels in the cell membrane (1324174625089691260). The mechanism requires Ca2+ and an intact actin filament network. If the same is true for secretory vesicles, osmotic cell swelling should stimulate hormone release (Fig. 2). Fig. 2.Mechanism of stimulated hormone release and of contraction after swelling of endocrine and vascular smooth muscle cells, respectively. Swelling leads to activation of anion channels, and exit of Cl− depolarizes cell membrane. Subsequent activation of voltage-sensitive Ca2+ channels stimulates Ca2+ entry. Ca2+ then triggers hormone release from endocrine cells or contraction of smooth muscle cells, respectively.
Cell swelling has indeed been shown to trigger the release of insulin (95768), prolactin (4141063106610701304130613071309), gonadotropin-releasing hormone (563), luteinizing hormone (414415), thyrotropin (41410651306), aldosterone (5141081–10831301), and renin (34558211281129). Where tested, the hormone-releasing effect was correlated with an increase of intracellular Ca2+ activity (51498310621064–106910801308). In insulin-secreting β-cells, Ca2+ entry during cell swelling is partially due to activation of Cl− channels (82), with subsequent depolarization of the cell membrane and opening of voltage-sensitive Ca2+ channels (124).
Osmotic cell shrinkage has been shown to inhibit prolactin release, presumably by inhibiting Ca2+ influx (10651305). Furthermore, increase of extracellular osmolarity decreases the formation and release of endothelin-1 (640).
For atrial natriuretic factor (ANF), the position is less clear. It is released from cardiac myocytes in response to mechanical stretch (1981071) and osmotic cell swelling (412). Cell volume may be part of a negative-feedback loop limiting ANF release. Atrial natriuretic factor inhibits the cardiac Na+/K+/2Cl− exchanger via guanosine 3′,5′-cyclic monophosphate (cGMP), with the resulting cell shrinkage then inhibiting ANF release (199201). On the other hand, ANF release has been postulated to be stimulated by cell shrinkage (13991400).
In contrast to the above hormones, vasopressin is released during cell shrinkage, which apparently leads to disinhibition of a stretch-inactivated cation channel. The activation of this channel leads to depolarization and accelerated action potentials (913). Interestingly, ethanol, which triggers hormone release from other cells (10631068), is known to inhibit vasopressin release (90). In addition to ADH, the release of nitric oxide (1152) and of the putative hormones ouabain or ouabainlike factors (98744) may be stimulated by an increase in plasma osmolarity. Furthermore, hyperosmolarity stimulates the release of histamine from basophil granulocytes (892) and of substance P from C-fiber neurons (375). Alterations of NaCl concentrations have further been shown to modify transmitter release from various regions of the brain (551).
Renin secretion is inhibited by an increase of intracellular Ca2+ activity, the so-called Ca2+ paradox of renin secretion (461923). It has been suggested that an increase of intracellular Ca2+ activity activates Ca2+-sensitive Cl− channels, thus leading to cellular loss of KCl and cell shinkage, which in turn would inhibit renin release (665).
Cell volume may further modify hormone and transmitter release through pH changes in secretory vesicles. In pancreatic β-cells, for instance, acidic proteases within the acidic secretory granules cleave proinsulin to yield insulin, a function probably compromised by cell swelling and fostered by cell shrinkage. Furthermore, the release of insulin may be modified by the luminal pH of the secretory granules and thus be sensitive to alterations of cell volume. In neurons, metabolism, uptake, and release of neurotransmitters may be modified by the luminal pH of synaptic vesicles. For instance, the uptake of neurotransmitters such as catecholamines, glutamate, GABA, and acetylcholine into small synaptic vesicles is driven by a proton gradient between the cytosol and the acid lumen (254). Uptake of glutamate and aspartate into glial cells has indeed been found to be impaired by osmotic cell swelling (628).
Transmitter metabolism may be further influenced by cell volume through effects on the expression of enzymes. At enhanced extracellular K+, an increase of extracellular osmolarity inhibits the expression of tyrosine hydroxylase and dopamine β-hydroxylase in PC12 cells (621). Increasing extracellular osmolarity at low extracellular K+ was, however, without effect on the expression of these enzymes (621).
Some of the osmolytes released during cell swelling of neurons such as glutamate (1483045235508651339), aspartate (550891), GABA (774891), glycine (891), and taurine (184560) function as neurotransmitters in the brain. Hyperosmolar glucose or sorbitol concentrations inhibited K+-induced GABA release and inhibited K+-induced release of norepinephrine and serotonin (327).
F. Excitability and Contraction
After swelling of cardiac cells, volume-sensitive Cl− currents have been shown to depolarize the cell membrane (12531394), enhance excitability, and reduce the duration of the action potential (1139). On the other hand, moderate osmotic shrinkage exerts a positive inotropic effect in the heart (74432). This latter effect may be due to a direct influence on the contractile elements. As shown in skinned muscle fibers, increased ionic strength destabilizes the actinomyosin complex, thus interfering with the Ca2+-activated force (41398). To the extent that cell shrinkage leads to increase of intracellular ionic strength, this effect could modify muscular contraction. Osmotic swelling of smooth muscle cells (see Fig. 2) activates a depolarizing anion conductance, leading to depolarization, opening of voltage-gated Ca2+ channels, increase of intracellular Ca2+ activity, and contraction (685). Conversely, osmolar cell shrinkage leads to vasodilation (11121152).
An enhanced activity of Na+/H+ exchanger with resulting cell swelling has been implicated in the generation of one type of essential hypertension (271314348558664793887–8891022–102410261109112413301390). On the one hand, cell swelling should increase contractility of smooth muscle cells, and on the other hand, enhanced Na+/H+ exchange activity should favor cell proliferation and thus hypertrophy of vascular smooth muscle cells. Proliferation of vascular smooth muscle cells has been shown to be stimulated by mechanical stretch (770979).
Neuronal excitability could be affected in several ways by cell volume. Any release of K+ for cell volume regulation should enhance extracellular K+, decrease the K+ equilibrium potential, and thus depolarize the cell membrane. Possibly, however, swollen neurons do not volume regulate by rapid release of electrolytes (23).
As discussed in section vE, glutamate, aspartate, GABA, glycine, and taurine serve both as osmolytes and as neurotransmitters. When released from swollen cells, they may modify the function of neighboring cells (6281059). Conversely, the osmosensitive betaine transporter transports GABA at higher affinity than betaine (1374). Moreover, sensitivity of neurons to neurotransmitters may be modified by cell volume. For instance, NMDA receptors have been found to be mechanosensitive (929). Cell volume changes may further interfere with neuronal excitability by modifying the pH and trafficking of secretory vesicles (see above). Increases of osmolarity have been shown to increase the percentage of slow miniature end-plate potentials (1262).
Chloride concentration in neurons is regulated by furosemide-sensitive Na+-K+-2Cl− cotransport (45839). Activation of K+ and Cl− channels shrinks the cells by KCl loss, decreases intracellular Cl− concentration, and thus dissipates the Cl− gradient. The cell shrinkage activates the Na+-K+-2Cl− cotransport, which not only restores cell volume but also maintains intracellular Cl− activity. Accordingly, GABA-induced depolarization was rendered transient by addition of furosemide (45). Moreover, furosemide has been shown to block synchronized burst discharges in hippocampal slices (538).
Excitability of neurons critically depends on glial cell function (612). One of the major tasks of glial cells is to maintain constancy of extracellular K+. Because of the minimal extracellular space, any release of K+ from neurons during depolarization would lead to rapid increase of extracellular K+ concentration, a dissipation of the chemical K+ gradient, and thus to impairment of repolarization. Glial cells accumulate K+ and thus blunt the increase of extracellular K+ concentration in part by uptake of K+ through Na+-K+-2Cl− cotransport in parallel with Na+-K+-ATPase (1298). This function is expected to be compromised during glial cell swelling. Glial cell swelling has indeed been implicated in a wide variety of disorders affecting the brain (5056246496508968981220). In hepatic encephalopathy, for instance, the enhanced NH3 concentration forces the formation and cellular accumulation of glutamine, leading to glial cell swelling (218896898). One of the consequences is cellular loss of inositol (2186491021). Accordingly, inhibition of glutamine synthetase has been found to be protective against hepatic encephalopathy (512). A striking increase of brain inositol is observed in Alzheimer's disease (1122). It is not clear, though, whether this change relates to altered cell volume regulation and contributes to the pathophysiology of this disease.
In part as a result of the above interactions, increased plasma osmolarity decreases and reduced plasma osmolarity increases the susceptibility to epileptic seizures (22921). It must be kept in mind, though, that alterations of plasma osmolarity primarily create an osmotic gradient across the blood-brain barrier, leading to respective changes of extracellular space (2351125) and movements of electrolytes from or to brain tissue (822). The decrease of extracellular space during osmotic cell swelling may be a major cause for altered excitability (9211224). Fig. 3.Polarized cell volume regulatory ion transport in migrating cells. Cell migrates from left to right. At rear end, oscillations of intracellular Ca2+ activity (Cai) lead to activation of Ca2+-sensitive K+ channels, favoring regulatory cell volume decrease (RVD). At leading edge, Na+/H+ exchange and Na+-K+-2Cl− cotransport favor regulatory cell volume increase (RVI). Ca2+ oscillations further trigger depolymerization of actin filaments at rear end. Fragments are transported to leading edge, where polymerization of actin filaments prevails.
G. Migration
Migration involves substantial reorganization of the cytoskeleton both at the leading edge and the rear of the cell (2022151162) (see Fig. 3). At the leading edge, polymerization of actin filaments prevails, whereas at the rear of the cells, actin filaments are depolymerized (1162). The depolymerization is mediated by capping or escort proteins, such as gelsolin, which are stimulated by Ca2+ (23749211621355). In fact, after chemotactic stimuli, Ca2+ concentration increases primarily at the rear of the cell (136463756). Bound to the capping or escort proteins, the actin fragments travel toward the leading edge, where they are reutilized for elongation of the actin filaments. The elongation is stimulated by polyphosphoinositides, which bind and thus neutralize the capping proteins (1162). The addition of new elements to the actin filament is thought to be facilitated by protrusion of the cell membrane, which may be caused by local osmotic swelling (1162).
Migration of leukocytes can be stimulated by chemoattractants such as formylpeptides (727). N-formyl-methionyl-leucyl-phenylalanine (FMLP) stimulates Na+/H+ cotransport in neutrophils, leading to cell swelling (842870871100310191365). Activation of Na+/H+ exchange and cell swelling are required for migration, which is impeded by inhibitors of the carrier and osmotic cell shrinkage (10031019). Similarly, inhibition of Na+-K+-2Cl− cotransport with bumetanide inhibited migration of transformed MDCK cells (1101). In those cells, migration further requires the operation of Ca2+-sensitive K+ channels, which are activated by oscillating intracellular Ca2+ activity (2401101). Inhibition of these channels similarly prevented migration. It is attractive to postulate that migration involves RVD with Ca2+ oscillations and activation of K+ channels at the rear and RVI with activation of Na+/H+ exchange and/or Na+-K+-2Cl− cotransport at the leading edge of a migrating cell. The migration would require asymmetrical distribution and/or activation of channels and carriers. As a matter of fact, the Na+/H+ exchanger is concentrated at the leading edge (431) and K+ channel activity at the rear of the cell (10991100), and a Ca2+ gradient has been observed within a migrating cell with highest values at the rear (1364014631098).
The elongation of the neuritic cylinder, but not the extension of the growth cone of neurons, has been observed to be stimulated by a decrease of extracellular osmolarity (117). Accordingly, the role of osmotic gradients in the protrusion of the leading edge is still a matter of debate (1179651162). Obviously, variation of extracellular osmolarity does more than modify the detachment of the cell membrane from the cytoskeleton. In any case, more experimentation is needed to elucidate the role of cell volume regulatory mechanisms in the machinery of migration.
H. Pathogen Host Interactions
Reports on the interplay of cell volume and infection are scarce. It is well known that cholera toxin activates both Cl− and K+ channels via cAMP (337), an effect expected to result in cell shrinkage. The heat-stable toxin from Escherichia coli has been shown to activate Cl− channels via cGMP (749), and erythrocytes infected with malaria display new ion permeation pathways (633). Moreover, several bacteria produce porins, which may be inserted into the host cell membrane (977711328). Because porins may function as Cl− channels (10351338), it is tempting to speculate that they serve to alter host cell volume. Exposure of erythrocytes to Schistosoma mansoni membrane fractions has indeed been shown to produce marked cell shrinkage (1201). However, whether the metabolic alterations triggered by cell swelling or shrinkage are favorable for the pathogen is similarly unknown. As outlined above, cell shrinkage inhibits O−2 formation in neutrophils, an effect possibly contributing to the inhibitory effect on bacterial killing in a hypertonic environment (481). On the other hand, a hypertonic environment increases adherence and invasion of Salmonella typhi (1195).
Similar scanty information is available on the role of cell volume in viral infection. The M2 protein of influenza virus serves as an ion channel (974). Whether the insertion of this channel into the host membrane alters cell volume is not known. Tacaribe virus infection was shown to inhibit Na+-K+-ATPase (996), and vaccinia virus infection of HeLa cells led to increases of Na+ at the expense of K+ (899). Infection of fibroblasts with herpes simplex virus leads to profound cell swelling (441). Cell swelling was enhanced in the presence of the antiviral drug 3′-azido-3′-deoxythymidine, which inhibits ICln , the putative volume regulatory Cl− channel (441). Infection of renal tubule cells with simian virus 40 results in the appearance of K+ channels (1199). Changes in cell volume, on the other hand, may influence viral replication. For instance, a decrease of extracellular NaCl has been shown to reduce replication of reticuloendotheliosis (93) and Sindbis virus (1290) as well as maturation of poliovirus (5). Furthermore, infection of MDCK cells with vesicular stomatitis virus is impaired by increasing extracellular K+ at the expense of Na+ (7), a maneuver known to induce cell swelling (see Table 2). The effect could not be explained by altered intracellular Ca2+ activity but was assumed to be secondary to a depolarization of the cell membrane (7). In duck hepatocytes, increase of extracellular osmolarity markedly reduced duck hepatitis B virus DNA, mRNA, and protein (904). Because shrinkage of hepatocytes leads to depolarization (406), the effect could have been due to either depolarization or cell shrinkage.
In tracheal epithelium, sulfation and sialation of membrane proteins has been shown to be sensitive to luminal pH of acidic cellular compartments, and it has been argued that defective acidification of these compartments in cystic fibrosis leads to altered sulfation and sialation and thus to enhanced adhesion of Pseudomonas aeruginosa (54). Because the primary defect of cystic fibrosis leads to impaired Cl− channel activity (92170171350111813361337) and impairment of cell volume regulation (1252), it may be paralleled by cell swelling, which increases lysosomal pH (see sect. iiiL). Thus cell swelling could enhance adhesion of P. aeruginosa and infection, a possibility, however, not yet explored.
Clearly, the role of cell volume in the interaction of host and pathogen is far from understood. The data available thus far, however, are sufficiently intriguing to justify additional experimental effort.
I. Cell Proliferation
A wide variety of mitogenic factors (for review, see Ref. 1000) activate the Na+/H+ exchanger, and many factors stimulate Na+-K+-2Cl− cotransport (85428826844928100012741275129112921293). One expected consequence of the activation of these transport systems is an increase of cell volume.
Cell proliferation has indeed been shown to correlate with increases of cell volume in fibroblasts (694695824960), mesangial cells (1371), lymphocytes (28428545411141117), HL-60 cells (120146), GAP A3 hybridoma cells (884), smooth muscle cells (317881), and HeLa cells (1185). As shown for fibroblasts, the cell volume increase parallels the entry of fibroblasts from the G1 into the S phase (960), which is accompanied by inhibition of K+ channels (253). Moreover, large variations of volume regulatory Cl− channels have been observed in ascidian embryos (1273).
Osmotic alterations of cell volume indeed modify cell proliferation. Hypertonic shrinkage inhibits (953384096710081380) and slight osmotic cell swelling has been shown to accelerate (18) cell proliferation. When exposed to enhanced extracellular ionic strength, the cells may overcome cell shrinkage by cellular accumulation of osmolytes which then allows them to proliferate normally (72013791380).
As illustrated in Figure 4, Ras oncogene expression in fibroblasts is paralleled by enhanced Na+/H+ exchange and Na+-K+-2Cl− cotransport activity, leading to an increase of cell volume (694695824). The increase of cell volume is related to oscillations of intracellular Ca2+ activity (242), which can be triggered by bradykinin, bombesin, or serum in those cells (686694697129613591360). The Ca2+ oscillations cause rapid transient cell shrinkage due to activation of Ca2+-sensitive K+ channels (10051358), followed by a sustained increase of cell volume presumably due to a depolymerization of the actin filaments (2431004) and subsequent shift of the set point for cell volume regulation (242). The Ca2+ oscillations are in turn favored by cell shrinkage (1006), pointing to a negative-feedback loop (Fig. 4). Fig. 4.Cell volume in proliferating cells. Cellular mechanisms triggered by expression of ras oncogene leading to activation or inhibition of cell volume regulatory mechanisms. Expression of Ras oncogene (RAS) sensitizes phospholipase C (PLC) for growth promotors such as bradykinin, bombesin, or serum. As a result, bradykinin-induced formation of inositol 1,4,5-trisphosphate (IP3) and inositol 1,3,4,5-tetrakisphosphate (IP4) is enhanced. Instead of a single release of cellular Ca2+, bradykinin induces sustained oscillations of intracellular Ca2+ concentration by triggering both Ca2+ entry through Ca2+ channels and Ca2+ release from cellular stores. On one hand, Ca2+ oscillations cause repetitive activation of Ca2+-sensitive K+ channels, leading to oscillations of cell membrane potential and transient decrease of cell volume. On the other hand, Ca2+ oscillations lead to depolymerization of actin filaments, which presumably facilitates activation of Na+/H+ exchanger and Na+-K+-2Cl− cotransport. Activation of these carriers results in uptake of KCl and NaCl. Because Na+ is replaced by K+ by action of Na+-K+-ATPase, cells accumulate mainly KCl. Ion uptake increases cell volume, which is one prerequisite for stimulation of cell proliferation. Increase of cell volume is limited by inhibition of Na+/H+ exchanger and Na+-K+-2Cl− cotransport by cell swelling (ICS and ECS stand for intracellular and extracellular space, respectively).
Apparently, the activation of Na+/H+ exchange and Na+-K+-2Cl− cotransport is required for stimulation of cell proliferation by ras oncogene (6946978241000). In several cell types, cell proliferation is similarly correlated with enhanced Ca2+ and K+ channel activity (for review, see Ref. 1000) and is impeded by respective channel inhibitors (1772673989398110911123119912561369). However, the activity of certain ion channels and transporters may not always be required for cell proliferation to occur. Inhibition of the Na+/H+ exchanger, for instance, is not always found to interfere with cell proliferation (831895988271025).
How alterations of cell volume interact with cell cycle control is not known. As outlined above, cell swelling stimulates the protein kinases ERK-1 and ERK-2 (1072), proteins probably involved in regulation of cell cycle (113).
In proliferating cells, the role of increased cell volume in altering further volume-sensitive cellular functions such as alkalinization of lysosomal vesicles (588), decreased proteolysis (501), and increased LDL receptor expression at the cell surface (1136) has not yet been explored.
In contrast to cell proliferation, cell differentiation is accompanied by cell shrinkage in erythroleukemia cells (264458607725), HL-60 leukemic cells (311475), and EMT6/ro mouse mammary sarcoma cells (118). HL-60 cells shrink despite enhanced expression of Na+/H+ exchanger (986), which displays altered kinetic properties (227228). On the other hand, senescent fibroblasts have been shown to gain cell volume (960961).
J. Cell Death
Apoptotic cell death (6171367) is triggered by a wide variety of factors including stimulation of specific receptors at the cell membrane, such as the receptor for Fas (CD95) (1074) or tumor necrosis factor-α (655).
One of the hallmarks of apoptotic cell death is cell shrinkage (1207). Shrinkage may in some cells be secondary to increased intracellular Ca2+ activity (9221226) and subsequent activation of Ca2+-sensitive K+ and/or Cl− channels. Accordingly, it could be inhibited by K+ channel blockers or increased extracellular K+ concentration (5561). Stimulation of the Fas-receptor leads to rapid activation of cell volume regulatory Cl− channels (I. Szabo, E. Gulbins, and F. Lang, unpublished observations) as well as delayed taurine release, the latter effect paralleling cell shrinkage (686a). The loss of cell volume may be functionally important, since a doubling of extracellular osmolarity has been shown to trigger apoptosis (109811). Moreover, the ability of cells to resist osmotic shrinkage by cell volume regulation paralleled their resistance to apoptosis after an osmotic shock (109). As discussed in section iiiH, osmotic stress triggers the MAPK pathway, leading to activation of JNK via the MAPK kinase (MKK4) (80985310201216). Both JNK and p38 kinase, another target of MKK4, have been invoked in the triggering of apoptosis (1368). On the other hand, MKK4 has been postulated to protect from apoptosis (894). Thus the precise function of these kinases in apoptosis remains elusive. Whether the proteolytic effect of cell shrinkage (see Table 1) contributes to apoptosis remains to be tested.
Surprisingly, Fas-induced cell death is inhibited during exposure of the cells to moderately hypertonic extracellular fluid (451). Moreover, in lymphocytes, stimulation of the Fas receptor leads to inhibition of the n-type K+ channel or Kv1.3 via tyrosine phosphorylation (4491183), which is the volume regulatory K+ channel in lymphocytes (273). It appears that cell shrinkage interferes at some point with the signaling cascade of apoptotic cell death. Fas-induced cell death is triggered by activation of caspases with subsequent stimulation of sphingomyelinases, ceramide formation, activation of Ras, PI 3-kinase, Rac, MKK4, and JNK or p38 kinase (4464481368). In addition, activation of Rac triggers formation of active oxygen species (AOS), presumably by the NADPH oxidase (447). Cell shrinkage apparently does not interfere with the cascade leading to Ras activation but prevents the formation of AOS, since the decrease of GSH is blunted in shrunken lymphocytes (451).
Several mechanisms could mediate the inhibition of the signaling cascade: cell shrinkage stimulates the expression of α1-chimerin (see Table 1), a GTPase activating protein for Rac. If a similar protein is expressed in lymphocytes as a function of cell volume, it could account for some inhibition of NADP oxidase activity. Moreover, cell shrinkage inhibits glucose flux through the pentose phosphate pathway, decreasing the availability of NADPH (see sect. vC). Furthermore, hyperosmolarity interferes with the respiratory burst oxidase (573). Along these lines, hyperosmotic cell shrinkage blunts agonist-triggered AOS formation (602659795810), and hyposmotic cell swelling stimulates AOS formation (602) in polymorphonuclear leukocytes. Leukocyte AOS production through NADPH oxidase is further inhibited by high concentrations of urea (1187), which at least in some cells leads to cell shrinkage (see sect. iiiA) and similar to osmotic shrinkage inhibits Fas-induced cell death (E. Gulbins and F. Lang, unpublished observations).
Although the decreased NADPH availability in shrunken cells may interfere with endogenous formation of AOS and thus protects from Fas-induced cell death, it renders the cells more vulnerable to exogenous oxidative stress, whereas cell swelling appears to protect from exogenous oxidative stress (8041046).
Beyond the role of AOS, cell shrinkage is expected to turn on Na+/H+ exchange, leading to alkalinization (see sect. iiB). Intracellular acidosis, on the other hand, has been considered a prerequisite for apoptosis (405).
Because cell shrinkage apparently interferes with the Fas signaling pathway, the inhibition of K+ channels after activation of the Fas receptor could serve to prevent premature inhibition of the signaling cascade by cell shrinkage. In analogy with Fas-induced cell death, methylprednisolone-induced apoptosis of thymocytes was observed to be inhibited by low doses of the K+ ionophore valinomycin (255). Furthermore, tumor necrosis factor-α has been shown to stimulate Na+/H+ exchange (1248).
Clearly, the role of cell volume regulatory mechanisms in apoptotic cell death is still ill-defined, and at this point, their functional significance remains a matter of speculation.
K. Others
Obviously, a number of further functions involve alterations of cell volume and/or activation of volume regulatory mechanisms.
Phagocytosis, for instance, could be expected to increase cell volume. Indeed, phagocytotic Kupffer cells do contain betaine, which is released during phagocytosis (13191393). Similarly, the ion channels activated during phagocytosis (641) may at least in part serve RVD. Moreover, phagocytosis has been shown to be sensitive to ambient osmolarity (1321).
Activation of thrombocytes is paralleled by excessive cell shrinkage, which participates in the metamorphosis of the cells (59).
Furthermore, some evidence points to the involvement of cell volume regulatory mechanisms during lymphocyte adhesion, which may play a permissive role in the activation of Na+/H+ exchange (5621103–1106). Binding to L-selectins, with the receptors mediating the first contact of lymphocytes with the endothelial cell surface (1018), triggers an intracellular cascade involving Ras activation (121), ultimately leading to an increase of cell volume (E. Gulbins, B. Brenner, and F. Lang, unpublished observations). The functional significance of these events is still elusive but may relate to the considerable mechanical forces operative during adhesion of lymphocytes to the endothelial surface (1395).
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