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• W2003802870 abstract "Transcriptional regulation by changes in tonicity. Most organisms respond to a hypertonic environment by accumulating small organic solutes. In contrast to high concentrations of electrolytes, the small organic solutes do not perturb the activity of enzymes and other macromolecules within the cell. When the renal medulla becomes hypertonic during antidiuresis, multiple signaling pathways are activated. Here, we review the role of tonicity responsive enhancers (TonE) binding protein (TonEBP), a transcription factor activated in hypertonic cells. The activation of TonEBP by hypertonicity results from its translocation to the nucleus as well as an increase in TonEBP mRNA and protein. TonEBP may have a role beyond the response to tonicity since it is highly expressed in activated lymphocytes and in developing tissues. Transcriptional regulation by changes in tonicity. Most organisms respond to a hypertonic environment by accumulating small organic solutes. In contrast to high concentrations of electrolytes, the small organic solutes do not perturb the activity of enzymes and other macromolecules within the cell. When the renal medulla becomes hypertonic during antidiuresis, multiple signaling pathways are activated. Here, we review the role of tonicity responsive enhancers (TonE) binding protein (TonEBP), a transcription factor activated in hypertonic cells. The activation of TonEBP by hypertonicity results from its translocation to the nucleus as well as an increase in TonEBP mRNA and protein. TonEBP may have a role beyond the response to tonicity since it is highly expressed in activated lymphocytes and in developing tissues. The concentration of electrolytes within renal medullary cells remains remarkably constant despite large changes in the effective osmotic activity (tonicity) of the interstitium of the renal medulla (sodium varies between 140 mmol/L in hydrated rats and more than 400 mmol/L in antidiuretic rats)1.Beck F. Dorge A. Rick R. Thurau K. Intra- and extracellular element concentrations of rat renal papilla in antidiuresis.Kidney Int. 1984; 25: 397-403Abstract Full Text PDF PubMed Scopus (85) Google Scholar. The stability of the intracellular electrolyte concentration results from the tonicity-regulated accumulation of specific small organic solutes that, in contrast to changing concentrations of electrolytes, do not perturb the activity of proteins and other macromolecules within cells2.Yancey P.H. Clark M.E. Hand S.C. et al.Living with water stress: Evolution of osmolyte system.Science. 1982; 217: 1214-1222Crossref PubMed Scopus (3002) Google Scholar. The nonperturbing organic solutes that are accumulated by cells in the hypertonic medulla and in a variety of cultured cells are polyhydric alcohols (myoinositol and sorbitol), methylamines (betaine and glycerophosphorylcholine), and amino acids (taurine, alanine, proline, and to a lesser extent, other amino acids). Nonperturbing solutes are accumulated as the result of changes in the activity of rate-limiting, sodium-coupled transporters that carry the organic solutes into cells against steep concentration gradients (myoinositol, betaine, amino acids) and changes in activity of rate-limiting enzymes that catalyze solute synthesis (sorbitol) or degradation (glycerophosphorylcholine). Molecular cloning of the cDNAs for the rate-limiting proteins revealed that the increases in activities of those proteins result from a hypertonicity-induced increase in the transcription of their genes and the resulting increase in synthesis of the proteins. The single exception is a transcription-independent decline in the activity of glycerophosphorylcholine phosphodiesterase, which degrades glycerophosphorylcholine3.Kwon E.D. Zablocki K. Jung K.Y. et al.Osmoregulation of GPC:choline phosphodiesterase in MDCK cells: Different effects of urea and NaCl.Am J Physiol. 1995; 269: C35-C41Google Scholar. Within the past few years, we have gained further insight into the molecular mechanism of the regulation of transcription by hypertonicity. The regulation of transcription of most nonhousekeeping genes depends on specific DNA elements that are typically located in the region 5′ to their promoter. Tonicity responsive enhancers (TonEs) have been identified in that region of the gene for the betaine transporter (BGT1)4.Takenaka M. Preston A.S. Kwon H.M. Handler J. The tonicity-sensitive element that mediates increased transcription of the betaine transporter gene in response to hypertonic stress.J Biol Chem. 1994; 269: 29379-29381Abstract Full Text PDF PubMed Google Scholar and subsequently in that region of the gene for aldose reductase (AR), where they were designated osmotic response elements (ORE)5.Ferraris J.D. Williams C.K. Jung K.-Y. et al.ORE, a eukaryotic minimal essential osmotic response element: The aldose reductase gene in hyperosmotic stress.J Biol Chem. 1996; 271: 18318-18321https://doi.org/10.1074/jbc.271.31.18318Crossref PubMed Scopus (156) Google Scholar, 6.Daoudal S. Tournaire C. Halere A. et al.Isolation of the mouse aldose reductase promoter and identification of a tonicity-responsive element.J Biol Chem. 1997; 272: 2615-2619https://doi.org/10.1074/jbc.272.5.2615Crossref Scopus (36) Google Scholar, 7.Ko B.C.B. Chung S.M. Identification and characterization of multiple osmotic response sequences in the human aldose reductase gene.J Biol Chem. 1997; 272: 16431-16437https://doi.org/10.1074/jbc.272.26.16431Crossref PubMed Scopus (191) Google Scholar, and in distant 5′ regions of the SMIT gene8.Rim J.S. Atta M.G. Dahl S.C. et al.Transcription of the sodium/myo-inositol cotransporter gene is regulated by multiple tonicity-responsive enhancers spread over 50 kilobase pairs in the 5′-flanking region.J Biol Chem. 1998; 273: 20615-20621https://doi.org/10.1074/jbc.273.32.20615Crossref PubMed Scopus (153) Google Scholar. The TonE consensus sequence TGGAAANNYNY confers transcriptional stimulation by hypertonicity on reporter genes with TonEs in their 5′ region. In addition, the nucleus of hypertonic cells contains a protein that binds to radiolabeled TonEs in vitro in electrophoretic mobility shift assays (EMSAs) with far more activity than that found in the nucleus of isotonic cells. In hypertonic cells, specific G residues within the TonEs of BGT1 and SMIT are protected from methylation in so-called in vivo footprinting assays, whereas in isotonic cells, those G residues are methylated8.Rim J.S. Atta M.G. Dahl S.C. et al.Transcription of the sodium/myo-inositol cotransporter gene is regulated by multiple tonicity-responsive enhancers spread over 50 kilobase pairs in the 5′-flanking region.J Biol Chem. 1998; 273: 20615-20621https://doi.org/10.1074/jbc.273.32.20615Crossref PubMed Scopus (153) Google Scholar. The changes in EMSA mobility and the protection from methylation in hypertonic cells suggest that the activation of transcription conferred by TonEs is the result of the binding of one or more proteins to TonEs. Using TonEs as bait in yeast one-hybrid assays, we cloned the cDNA for a novel transcription factor, TonE binding protein (TonEBP), a large protein of approximately 160 kD9.Miyakawa H. Woo S.K. Dahl S.C. et al.Tonicity-responsive enhancer binding protein, a Rel-like protein that stimulates transcription in response to hypertonicity.Proc Natl Acad Sci USA. 1999; 96: 2538-2542https://doi.org/10.1073/pnas.96.5.2538Crossref PubMed Scopus (472) Google Scholar. Unexpectedly, mRNA for TonEBP is expressed in every tissue examined. The highest levels of expression are found in the renal medulla, brain, and heart. Figure 1 presents cartoon diagrams of TonEBP and the NFAT transcription factors, which play a key role in the regulation of transcription in activated lymphocytes, heart, and mesenchymal cells. The TonEBP sequence carboxy to the DNA binding domain contains many glutamine residues, a feature commonly found in the activator region of transcription factors. The hypothesis that the glutamine-rich region mediates transcriptional activation was supported when we expressed a peptide lacking the presumed activator domain. The truncated protein behaved as a dominant negative; that is, it inhibited the transcriptional activation of reporter genes in hypertonic cells9.Miyakawa H. Woo S.K. Dahl S.C. et al.Tonicity-responsive enhancer binding protein, a Rel-like protein that stimulates transcription in response to hypertonicity.Proc Natl Acad Sci USA. 1999; 96: 2538-2542https://doi.org/10.1073/pnas.96.5.2538Crossref PubMed Scopus (472) Google Scholar. The DNA binding domain of TonEBP has a 45% identity to the DNA binding domains of the NFAT family of transcription factors, which share about 80% identity in that region. The greater identity within the DNA binding domain of NFATs includes a region that interacts with the transcription factor AP1. TonEBP lacks the region for interaction with AP1 and, in contrast to the NFAT transcription factors, stimulates transcription in the absence of activated AP110.Lopez-Rodriguez C. Aramburu J. Rakeman A.S. Rao A. NFAT5, a constitutively nuclear FNAT protein that does not cooperate with Fos and Jun.Proc Natl Acad Sci USA. 1999; 96: 7214-7219https://doi.org/10.1073/pnas.96.13.7214Crossref PubMed Scopus (316) Google Scholar. Using a variety of strategies, other laboratories have subsequently cloned TonEBP and called it NFAT510.Lopez-Rodriguez C. Aramburu J. Rakeman A.S. Rao A. NFAT5, a constitutively nuclear FNAT protein that does not cooperate with Fos and Jun.Proc Natl Acad Sci USA. 1999; 96: 7214-7219https://doi.org/10.1073/pnas.96.13.7214Crossref PubMed Scopus (316) Google Scholar, NFATL111.Trama J. Lu Q. Hawley R.G. Ho S.N. The NFAT-related protein NFATL1 (TonEBP/NFAT5) is induced upon t cell activation in a calcineurin-dependent manner.J Immunol. 2000; 165: 4884-4894Crossref PubMed Scopus (133) Google Scholar, NFATz12.Pan S. Tsurita R. Masuda E.S. et al.NFATz: A novel rel similarity domain containing protein.Biochem Biophys Res Commun. 2000; 272: 765-776Crossref PubMed Scopus (16) Google Scholar, and OREBP13.Ko B.C.B. Turck C.W. Lee K.W. et al.Purification, identification, and characterization of an osmotic response element binding protein.Biochem Biophys Res Commun. 2000; 270: 52-61Crossref PubMed Scopus (120) Google Scholar. In contrast to the members of the NFAT family, TonEBP has no sequence homology to NFAT proteins outside of the DNA binding domain. Specifically, TonEBP lacks a sequence that is located amino terminal to the DNA binding domain, is phosphorylated by a nuclear protein kinase and directs the export of NFATs to the cytoplasm. In quiescent cells, NFATs are cytosolic. When lymphocytes are activated and cell calcium rises, NFATs are dephosphorylated by the calcium-calmodulin–sensitive phosphatase calcineurin and move to the nucleus where they regulate expression of specific genes. Activation of NFATs is inhibited by cyclosporine A and by FK506, which inhibit the phosphatase activity of calcineurin. Although there is a preliminary report of inhibition of the transcriptional response to hypertonicity by cyclosporine A and by FK506 using high concentrations of these agents (abstract; Sheikh-Hamad et al, J Am Soc Nephrol 11:47A, 2000), we found that cyclosporine A and FK506 had no effect on the stimulation by hypertonicity of BGT1 activity and had divergent effects on the stimulation of SMIT activity14.Atta M.G. Dahl S.C. Kwon H.M. Handler J.S. Tyrosine kinase inhibitors and immunosuppressants perturb the myo-inositol but not the betaine cotransporter in isotonic and hypertonic MDCK cells.Kidney Int. 1999; 55: 956-962https://doi.org/10.1046/j.1523-1755.1999.055003956.xAbstract Full Text Full Text PDF Scopus (18) Google Scholar. Another laboratory found that concentrations of cyclosporine A or FK506 that clearly inhibited calcineurin activity in lymphocytes did not inhibit the transcriptional response to hypertonicity in the same cells11.Trama J. Lu Q. Hawley R.G. Ho S.N. The NFAT-related protein NFATL1 (TonEBP/NFAT5) is induced upon t cell activation in a calcineurin-dependent manner.J Immunol. 2000; 165: 4884-4894Crossref PubMed Scopus (133) Google Scholar. TonEBP undergoes a number of changes when it is activated by hypertonicity. First, TonEBP is phosphorylated when cells are shifted to a hypertonic medium15.Dahl S.C. Handler J.S. Kwon H.M. Hypertonicity-induced phosphorylation and nuclear localization of the transcription factor TonEBP.Am J Physiol (Cell Physiol). 2001; 280: C248-C253Google Scholar. Most of the phosphorylation occurs at serine residues, but also there is increased tyrosine phosphorylation. Since TonEBP contains 197 serine residues and 13 tyrosine residues, it will be difficult to identify the important phospho-residues. Using immunofluorescence and immunoprecipitation from cell fractions, we found that in isotonic cells, approximately half of the cell's TonEBP is in the cytoplasm and half in the nucleus. Within an hour of exposure to hypertonicity, cytoplasmic TonEBP diminishes, and nuclear TonEBP increases. After 8 to 12 hours, almost all of the TonEBP is nuclear9.Miyakawa H. Woo S.K. Dahl S.C. et al.Tonicity-responsive enhancer binding protein, a Rel-like protein that stimulates transcription in response to hypertonicity.Proc Natl Acad Sci USA. 1999; 96: 2538-2542https://doi.org/10.1073/pnas.96.5.2538Crossref PubMed Scopus (472) Google Scholar. In view of the similar time course for phosphorylation of TonEBP and its movement to the nucleus, we hypothesize that the phosphorylation plays a role in moving TonEBP to the nucleus, but this remains to be tested. In vitro binding assays showed that the association of TonEBP with TonE enhancer sequences is not affected by phosphorylation. Proteasome activity is also important in the regulation of TonEBP by hypertonicity. When proteasome protease activity is inhibited, movement of TonEBP to the nucleus is decreased, as is the increase in nuclear TonEBP activity16.Woo S.K. Maouyo D. Handler J. Kwon H.M. Nuclear redistribution of tonicity-responsive enhancer binding protein requires prosteasome activity.Am J Physiol (Cell Physiol). 2000; 278: C323-C330Google Scholar. In analogy to the regulation of nuclear factor-κB (NF-κB), there may be a cytosolic protein that limits TonEBP movement to the nucleus in control cells that is degraded by proteasomes in hypertonic cells, but for the moment this is only speculation. In addition to translocation to the nucleus, activation by hypertonicity also evokes an increase in total cell TonEBP. The increase in TonEBP protein follows an increase in TonEBP mRNA abundance, which is probably the result of stimulating the transcription of TonEBP. Unfortunately, the very low level of transcription of TonEBP precludes assessment of transcription by classic nuclear run-off assays. The regulation of TonEBP by tonicity is bidirectional. When cells are switched from a hypertonic to an isotonic medium, the degradation of TonEBP mRNA and protein is not affected by tonicity, as they decay with half-lives of approximately 6 and 10 hours, respectively. Since TonEBP has a detectable level of activity in isotonic cells, we examined its status in cells adapted to growth in medium made hypotonic by removing most of the NaCl in the medium. The level of TonEBP fell in hypotonic cells, and nuclear immunostaining decreased far more than in cytosolic cells17.Woo S.K. Dahl S.C. Handler J.S. Kwon H.M. Bidirectional regulation of tonicity-responsive enhancer binding protein in response to changes in tonicity.Am J Physiol (Renal Physiol). 2000; 278: F1006-F1012PubMed Google Scholar. We return to these observations later when speculating about the regulation and function of TonEBP. There is a large gap in understanding how hypertonicity regulates TonEBP. First, how is hypertonicity detected? The strategy of maintaining intracellular ionic activity nearly constant by accumulating or losing organic osmolytes as external tonicity changes is an old one. Like the animal cells we study, bacteria, yeast, and most plant and animal cells accumulate amino acids and polyhydric alcohols when exposed to a hypertonic environment2.Yancey P.H. Clark M.E. Hand S.C. et al.Living with water stress: Evolution of osmolyte system.Science. 1982; 217: 1214-1222Crossref PubMed Scopus (3002) Google Scholar. Some bacterial osmolyte transporters are directly stimulated by hypertonicity18.Racher K.I. Voegele R.T. Marshall E.V. et al.Purification and reconstitution of an osmosensor: Transporter ProP of Escherichia coli senses and responds to osmotic shifts.Biochem J. 1999; 38: 1676-1684Crossref Scopus (109) Google Scholar,19.Huang K.-J. Lan C.-Y. Igo M.M. Phosphorylation stimulates the cooperative DNA-binding properties of the transcription factor OmpR.Proc Natl Acad Sci USA. 1997; 94: 2828-2832https://doi.org/10.1073/pnas.94.7.2828Crossref PubMed Scopus (60) Google Scholar. The initial sensor in yeast is a two-component histidine kinase located in the plasma membrane20.Posas F. Wurgler-Murphy S.M. Maeda T. et al.Yeast HOG1 MAP kinase cascade is regulated by a multistep phosphorelay mechanism in the SLN1–YPD1-SSK1 “two-component” osmosenor.Cell. 1996; 86: 865-875Abstract Full Text Full Text PDF PubMed Scopus (742) Google Scholar. The sensor initiates a multistep phosphorelay cascade that activates a p38 mitogen-activated protein (MAP) kinase homologue, HOG kinase, which regulates the rate of transcription of a number of genes. Similar sensors have not been identified in animal cells, although there is evidence that animal cells detect changes in cell size or shape within minutes after exposure to a hypertonic environment21.Szasz K. Buday L. Kapus A. Shrinkage-induced protein tyrosine phosphorylation in Chinese hamster ovary cells.J Biol Chem. 1997; 272: 16670-16678https://doi.org/10.1074/jbc.272.26.16670Crossref Scopus (45) Google Scholar,22.Krump E. Nikitas K. Grinstein S. Induction of tyrosine phosphorylation and Na+/H+ exchanger activation during shrinkage of human neutrophils.J Biol Chem. 1997; 272: 17303-17311https://doi.org/10.1074/jbc.272.28.17303Crossref PubMed Scopus (127) Google Scholar. Since most cells return to near their original isotonic size within 30 minutes as a result of a regulatory volume increase mediated by ion uptake, it is unlikely that the activation of TonEBP, which occurs over hours, is mediated by cell size or shape. Multiple changes, including the rapid induction and suppression of many genes, occur when cells are abruptly shifted to a hypertonic environment. The cell cycle is arrested, and many regulatory pathways are activated or inhibited23.Dmitrieva N. Kultz D. Michea L. et al.Protection of renal inner medullary epithelial cells from apoptosis by hypertonic stress-induced p53 activation.J Biol Chem. 2000; 275: 18243-18247https://doi.org/10.1074/jbc.m000522200Crossref PubMed Scopus (0) Google Scholar,24.Kultz D. Madhany S. Burg M.B. Hyperosmolality causes growth arrest of murine kidney cells induction of GADD45 and GADD153 by osmosensing via stress-activated protein kinase 2.J Biol Chem. 1998; 273: 13645-13651https://doi.org/10.1074/jbc.273.22.13645Crossref PubMed Scopus (184) Google Scholar. Indirect evidence suggests that the sensor that regulates activation of TonEBP may detect intracellular ion activity. The activation of transcription by hypertonicity is reduced as cells accumulate organic osmolytes and cell ion concentrations return to those of isotonic cells. In cells in hypertonic medium, there is a close correlation between the increase in total cell cation concentration and the increase in activity of AR25.Uchida S. Garcia-Perez A. Murphy H. Burg M.B. Signal for induction of aldose reductase in renal medullary cells by high external NaCl.Am J Physiol (Cell Physiol). 1989; 256: C614-C620PubMed Google Scholar. Also, inhibition or stimulation of osmolyte accumulation by the removal or addition of transporter substrate prolongs or hastens the decline in the abundance of hypertonicity-induced taurine transporter26.Uchida S. Kwon H.M. Yamauchi A. et al.Molecular cloning of the cDNA for an MDCK cell Na+- and Cl--dependent taurine transporter that is regulated by hypertonicity.Proc Natl Acad Sci USA. 1992; 89: 8230-8234Crossref PubMed Scopus (313) Google Scholar or AR mRNA27.Moriyama T. Garcia-Perez A. Olson A.D. Burg M.B. Intracellular betaine substitutes for sorbitol in protecting renal medullary cells from hypertonicity.Am J Physiol (Renal Fluid Electrol). 1991; 260: F494-F497PubMed Google Scholar. There are many unanswered questions regarding TonEBP. TonEBP mRNA is expressed at low levels in most cells in culture and in virtually all tissues that have been sampled. However, only the kidney medulla normally experiences marked changes in tonicity. Does TonEBP regulate processes other than those involved in the response to hypertonicity? The low level of expression of TonEBP in isotonic cells is reduced further when cells are adapted to growth in hypotonic medium, as though a hypotonic state is the null condition. Perhaps the levels of TonEBP expression in isotonic cells are based on life in more hypotonic environments experienced by ancestral precursor cells. A recent report that TonEBP, like some NFAT transcription factors, is induced in lymphocytes by ConA or by ionomycin plus a phorbol ester is intriguing11.Trama J. Lu Q. Hawley R.G. Ho S.N. The NFAT-related protein NFATL1 (TonEBP/NFAT5) is induced upon t cell activation in a calcineurin-dependent manner.J Immunol. 2000; 165: 4884-4894Crossref PubMed Scopus (133) Google Scholar. In addition, TonEBP is expressed at much higher levels in embryonic tissues than in adult tissues11.Trama J. Lu Q. Hawley R.G. Ho S.N. The NFAT-related protein NFATL1 (TonEBP/NFAT5) is induced upon t cell activation in a calcineurin-dependent manner.J Immunol. 2000; 165: 4884-4894Crossref PubMed Scopus (133) Google Scholar. Does TonEBP play a role in development? The work from this laboratory was supported by National Institutes of Health Grants DK4448s and DK42479." @default.
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