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Vol. 273, Issue 3, 1832-1837, January 16, 1998

p38 Kinase Activity Is Essential for Osmotic Induction of mRNAs for HSP70 and Transporter for Organic Solute Betaine in Madin-Darby Canine Kidney Cells

David Sheikh-HamadDagger , John Di Mari, Wadi N. SukiDagger , Robert Safirstein, Bruns A. Watts III, and Diane RouseDagger

From the Dagger  Renal Division, Department of Medicine, Baylor College of Medicine, Houston, Texas 77030 and the  Renal Division, Department of Medicine, University of Texas Medical Branch, Galveston, Texas 77555

In renal cells, hypertonicity induces genes for heat shock proteins (HSP70, alpha B-crystallin), as well as enzymes and transporters directly involved in the metabolism and transport of protective organic osmolytes. While heat shock proteins are induced by many stresses including osmotic stress, the induction of the osmolytes genes appears to be specific to osmotic stress. These two adaptive mechanisms allow kidney cells to survive and function in the hypertonic environment that exists on routine basis in kidney medulla. In mammalian cells, hypertonicity induces three mitogen-activated protein kinase pathways: ERK (extracellular regulated kinase), JNK (Jun N-terminal kinase), and p38. ERK activation by osmotic stress is a consistent finding in many cells, but it is not essential for transcriptional regulation of mRNA for transporter of organic osmolyte betaine. While the growth of yeast cells on NaCl-supplemented medium is dependent on HOG1 pathway, it is still unclear which pathway mediates the adaptation to osmotic stress in mammalian cells. Here, we show that inhibition of p38 kinase activity, using the specific inhibitor SB203580 (4-(fluorophenyl)-2-(4-methylsulfonylphenyl)-5-(4-pyridyl) imidazole), abolishes the hypertonicity-mediated induction of mRNAs for HSP70 and betaine transporter in Madin-Darby canine kidney cells. The inhibition is dose-dependent and correlates with the in situ activity of native p38 kinase, determined as MAPKAPK-2 activity in cell extracts. As reported previously, the activities of ERK-1 and -2 were not affected by SB203580, but surprisingly, inhibition of native p38 kinase activity correlates with up-regulation of native JNK-1 activity in osmotically stressed cells. p38 mRNA is induced by hypertonic stress and is attenuated with p38 kinase inhibition. We also find that thermal induction of HSP70 mRNA is not affected by p38 kinase inhibition. Such findings suggest that p38 kinase activity is essential for the induction of genes involved in the adaptation of mammalian cells to osmotic stress and that the increased activity of JNK-1 during p38 kinase inhibition is consistent with regulation of JNK-1 by p38 kinase in osmotically stressed cells. In addition, the transduction pathways mediating HSP70 mRNA induction by different stresses appear to be divergent; osmotic induction of HSP70 is p38 kinase-dependent, while thermal induction is not.


Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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J. Biol. Chem., July 16, 1999; 274(29): 20185 - 20190.
[Abstract] [Full Text] [PDF]


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Proc. Natl. Acad. Sci. USAHome page
D. Kultz and L. Csonka
What sets the TonE during osmotic stress?
PNAS, March 2, 1999; 96(5): 1814 - 1816.
[Full Text] [PDF]


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Proc. Natl. Acad. Sci. USAHome page
H. Miyakawa, S. K. Woo, S. C. Dahl, J. S. Handler, and H. M. Kwon
Tonicity-responsive enhancer binding protein, a Rel-like protein that stimulates transcription in response to hypertonicity
PNAS, March 2, 1999; 96(5): 2538 - 2542.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Cell Physiol.Home page
J. D. Ferraris, C. K. Williams, A. Ohtaka, and A. Garcia-Perez
Functional consensus for mammalian osmotic response elements
Am J Physiol Cell Physiol, March 1, 1999; 276(3): C667 - C673.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
J.-J. Hung, T.-J. Cheng, Y.-K. Lai, and M. D.-T. Chang
Differential Activation of p38 Mitogen-activated Protein Kinase and Extracellular Signal-regulated Protein Kinases Confers Cadmium-induced HSP70 Expression in 9L Rat Brain Tumor Cells
J. Biol. Chem., November 27, 1998; 273(48): 31924 - 31931.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
D. Kultz, S. Madhany, and M. B. Burg
Hyperosmolality Causes Growth Arrest of Murine Kidney Cells. INDUCTION OF GADD45 AND GADD153 BY OSMOSENSING VIA STRESS-ACTIVATED PROTEIN KINASE 2
J. Biol. Chem., May 29, 1998; 273(22): 13645 - 13651.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
T. Yang, Y. Huang, L. E. Heasley, T. Berl, J. B. Schnermann, and J. P. Briggs
MAPK Mediation of Hypertonicity-stimulated Cyclooxygenase-2 Expression in Renal Medullary Collecting Duct Cells
J. Biol. Chem., July 21, 2000; 275(30): 23281 - 23286.
[Abstract] [Full Text] [PDF]


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Proc. Natl. Acad. Sci. USAHome page
N. I. Dmitrieva, D. V. Bulavin, A. J. Fornace Jr., and M. B. Burg
Rapid activation of G2/M checkpoint after hypertonic stress in renal inner medullary epithelial (IME) cells is protective and requires p38 kinase
PNAS, January 8, 2002; 99(1): 184 - 189.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Cell Physiol.Home page
O. Nahm, S. K. Woo, J. S. Handler, and H. M. Kwon
Involvement of multiple kinase pathways in stimulation of gene transcription by hypertonicity
Am J Physiol Cell Physiol, January 1, 2002; 282(1): C49 - C58.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Renal Physiol.Home page
H. Zhao, W. Tian, and D. M. Cohen
Rottlerin inhibits tonicity-dependent expression and action of TonEBP in a PKCdelta -independent fashion
Am J Physiol Renal Physiol, April 1, 2002; 282(4): F710 - F717.
[Abstract] [Full Text] [PDF]




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