期刊
CELLULAR SIGNALLING
卷 22, 期 6, 页码 955-960出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cellsig.2010.01.020
关键词
PDGF; Erk5; Akt; Caspase; Apoptosis
类别
资金
- Ludwig Institute for Cancer Research
- Swedish Research Council
- Swedish Cancer Foundation
Extracellular regulated kinase (Erk) 5 is a member of the mitogen activated protein (MAP) kinase family that has been implicated in both cell proliferation and survival. In the present study, we found that stimulation with platelet-derived growth factor (PDGF)-BB leads to a transient activation of Erk5, which was shown to be dependent on recruitment of both Src kinases and the tyrosine phosphatase Shp2 to the activated PDGF receptor beta (PDGFR beta). We could also demonstrate that Shp2 docking to the receptor is critical for Src kinase activation, suggesting that Shp2 may contribute to Erk5 activation through its involvement in Src kinase activation. Under control conditions. PDGF-BB promoted a sustained Akt phosphorylation. However, reduction of the expression of Erk5 by siRNA resulted in only a transient Akt phosphorylation, and an inability of PDGF-BB to suppress caspase 3 activation and inhibit apoptotic nuclear morphological changes such as condensed or fragmented chromatin under serum-free conditions. (C) 2010 Elsevier Inc. All rights reserved.
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