Bergler, Tobias and Stoelcker, Benjamin and Jeblick, Roland and Reinhold, Stephan W. and Wolf, Konrad and Riegger, Guenter A. J. and Kraemer, Bernhard K. (2008) High osmolality induces the kidney-specific chloride channel CLC-K1 by a serum and glucocorticoid-inducible kinase 1 MAPK pathway. KIDNEY INTERNATIONAL, 74 (9). pp. 1170-1177. ISSN 0085-2538,
Full text not available from this repository. (Request a copy)Abstract
The kidney-specific chloride channels CLC-K1/2 and their functionally important subunit barttin, by mediating solute transport in medulla, contribute to the osmotic gradient. We sought to determine whether they themselves are regulated by variations of osmolality. The expression of CLC-K1 and barttin mRNA and protein was significantly increased in a distal convoluted tubule cell line after a shift to high osmolar medium. This upregulation paralleled that of serum and glucocorticoid-inducible kinase 1 (SGK1), a gene known to be upregulated by cell shrinkage. Specific knockdown of SGK1 or addition of the p38 MAPK pathway inhibitor SB203580 abolished the induction of SGK1, CLC-K1 and barttin by high osmolarity suggesting that a functional MAPK pathway is required to mediate osmotic-driven induction of all three genes. The physiological relevance of our in vitro data was confirmed by water deprivation of male C57BL6 mice, which caused a significant increase in serum osmolality along with induction of CLC-K1, barttin and SGK1. Our study shows that change in intracellular volume, because of high osmolality, result in SGK1 upregulation and the subsequent increase of CLC-K1/barttin expression in distal renal tubular cells in vivo and in vitro.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | EPITHELIAL NA+ CHANNEL; THICK ASCENDING LIMB; CONVOLUTED TUBULE CELLS; RAT-KIDNEY; HYPEROSMOTIC STRESS; SURFACE EXPRESSION; K CHANNELS; BARTTIN; SGK1; LOCALIZATION; barttin; cell shrinkage; water deprivation; osmoregulation |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Innere Medizin II |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 21 Oct 2020 06:47 |
| Last Modified: | 21 Oct 2020 06:47 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30121 |
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