p21Waf1 inhibits the activity of cyclin dependent kinase 2 by preventing its activating phosphorylation

被引：28

作者：

Hitomi, M ^{[1
]}

Shu, JY ^{[1
]}

Agarwal, M ^{[1
]}

Agarwal, A ^{[1
]}

Stacey, DW ^{[1
]}

机构：

[1] Cleveland Clin Fdn, Dept Mol Biol, Lerner Res Inst, Cleveland, OH 44195 USA

来源：

ONCOGENE | 1998年 / 17卷 / 08期

关键词：

prostaglandin A2; cyclin; cyclin dependent kinase; gadd45; gadd153; p27(Kip1); p21(Waf1); p53;

D O I：

10.1038/sj.onc.1202005

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：

Prostaglandin A2 (PGA2), a potent inhibitor of the growth of many cell types, inhibits G1 phase cyclin dependent kinases (cdk). Although PGA2 suppresses cyclin D1 and elevates p21(Waf1) levels, it was the failure of cdk2 to become activated by phosphorylation which correlated best with growth inhibition. In kinetic studies, cdk2 activation was inhibited efficiently only if p21(Waf1) levels increased prior to the activating phosphorylation; suggesting that p21(Waf1) had blocked this phosphorylation. This model was confirmed in cells from p21(Waf1) knockout mice where PGA2 was completely unable to block the activating phosphorylation of cdk2, or inhibit cdk2 activity. As expected, growth inhibition of p21(Waf1-/-) cells was not observed at PGA2 concentrations which inhibited cdk2 activity and growth of p21Waf1-/- cells.

引用

页码：959 / 969

页数：11

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