CDK11p58 protein kinase activity is associated with Bcl-2 down-regulation in pro-apoptosis pathway |
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Authors: | Xiaojing Yun Yihong Wu Luyang Yao Hongliang Zong Yi Hong Jianhai Jiang Junwu Yang Zhou Zhang Jianxin Gu |
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Affiliation: | (1) Gene Research Center, Shanghai Medical College of Fudan University, Shanghai, 200032, P.R. China |
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Abstract: | CDK11p58, a G2/M-specific protein kinase, has been shown to be associated with apoptosis in many cell lines, with largely unknown mechanisms. Our previous study proved that CDK11p58-enhanced cycloheximide (CHX)-induced apoptosis in SMMC-7721 hepatocarcinoma cells. Here we report for the first time that ectopic expression of CDK11p58 down-regulates Bcl-2 expression and its Ser70, Ser87 phosphorylation in CHX-induced apoptosis in SMMC-7721 cells. Overexpression of Bcl-2 counteracts the pro-apoptotic activity of CDK11p58. Furthermore, we confirm that the kinase activity of CDK11p58 is essential to the down-regulation of Bcl-2 as well as apoptosis. Taken together, these results demonstrate that CDK11p58 down-regulates Bcl-2 in pro-apoptosis pathway depending on its kinase activity, which elicits survival signal in hepatocarcinoma cells. |
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Keywords: | Bcl-2 CDK11p58 Apoptosis Cycloheximide (CHX) SMMC-7721 hepatocarcinoma cells |
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