p38 kinase activity is essential for osmotic induction of mRNAs for HSP70 and transporter for organic solute betaine in Madin-Darby canine kidney cells.

The Journal of Biological Chemistry
D Sheikh-HamadD Rouse

Abstract

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-methylsulfonyl-phenyl)-5-(4-pyridyl) imidazole), abolishes the hypertoni...Continue Reading

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