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Vol. 10, No. 4, 2000
Issue release date: 2000
Cell Physiol Biochem 2000;10:203–208

h-sgk Serine-Threonine Protein Kinase as Transcriptional Target of p38/MAP Kinase pathway in HepG2 Human Hepatoma Cells

Waldegger S. · Gabrysch S. · Barth P. · Fillon S. · Lang F.
Institut für Physiologie I, Gmelinstr. 5, D-72076 Tübingen, Germany

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The human serum and glucocorticoid dependent serine/threonine kinase h-sgk has previously been discovered as cell volume regulated gene. The present study has been performed to elucidate the involvement of p38-kinase in the transcriptional control of h-sgk by osmotic cell shrinkage. The p38-kinase has previously been cloned as the mammalian homologue of HOG1 kinase, which constitutes a part of the osmosensor in the yeast Saccharomyces cerevisiae. Phosphorylated (active) p38-kinase has been estimated with Western blotting, transcription of hsgk using Northern blotting. Both, increase of extracellular NaCl concentration by 50 mmol/l and addition of 10 μmol/l anisomycin increase phosphorylation of the p38-kinase within 5 to 10 minutes. h-sgk transcription is upregulated by addition of 50 mmol/l NaCl and by anisomycin (10 μmol/l), effects completely inhibited by the specific p38-kinase inhibitor, SB 203580 (10 μmol/l). In conclusion, the stimulation of h-sgk transcription by osmotic cell shrinkage is mediated by p38-kinase.

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