کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1938013 | 1050730 | 2007 | 6 صفحه PDF | دانلود رایگان |
Glucocorticoids blunt insulin release, an effect partially due to activation of Kv channels. Similar to those channels Na+/K+ ATPase activity repolarizes the plasma membrane. The present study explored whether glucocorticoids increase the Na+/K+ ATPase activity in pancreatic β-cells. The glucocorticoid dexamethasone (100 nmol/l for 1 day) significantly increased Na+/K+ ATPase α1/β1-subunit transcript levels and ouabain-sensitive outward current reflecting Na+/K+ ATPase activity in INS-1 cells, effects blunted by glucocorticoid-receptor-blocker RU487 (1 μmol/l). Dexamethasone (100 nmol/l) increased K+ current in β-cells from wild type mice but not from knockout mice lacking functional serum and glucocorticoid inducible kinase SGK1. Thus, glucocorticoids indeed up-regulate Na+/K+ ATPase activity, an effect requiring SGK1.
Journal: Biochemical and Biophysical Research Communications - Volume 352, Issue 3, 19 January 2007, Pages 662–667