Serum/glucocorticoid-inducible kinase can phosphorylate the cyclic AMP response element binding protein, CREB

被引:38
作者
David, S [1 ]
Kalb, RG [1 ]
机构
[1] Childrens Hosp Philadelphia, Joseph Stokes Jr Res Inst, Philadelphia, PA 19104 USA
来源
FEBS LETTERS | 2005年 / 579卷 / 06期
关键词
serum/glucocorticoid-induced kinase; cyclic AMP response element binding protein; dexamethasone; phosphorylation;
D O I
10.1016/j.febslet.2005.01.040
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
To maintain homeostasis, cells often respond to stressful extra-cellular stimuli by new gene expression. Serum/glucocorticoid-induced kinase (SGK) is an immediate early gene whose expression is induced by a variety of extra-cellular stimuli. Here, we examine the possibility that SGK can directly phosphorylate the transcription factor cyclic AMP response element binding protein (CREB). In a cell-free context, SGK physically associates with CREB and SGK phosphorylates it on serine 133. Phospho-serine 133 is essential for stimulating the transcriptional activity of CREB. Further, we show that in a variety of cellular contexts, SGK phosphorylates CREB. Activation of receptor tyrosine kinase pathways or the phosphoinositide-dependent kinase I (PDK1) lead to SGK-dependent CREB phosphorylation. Hormonal stimulation of epithelial cells leads to the induction of endogenous SGK and CREB phosphorylation. A dominant-negative form of SGK blocks dexamethasone-induced CREB phosphorylation. Our studies indicate that stimulation of SGK can lead to CREB phosphorylation, suggesting that CREB-dependent gene transcription is an important link between stressful extra-cellular signals and cellular responses. (C) 2005 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:1534 / 1538
页数:5
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