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CDK11(p58) protein kinase activity is associated with Bcl-2 down-regulation in pro-apoptosis pathway

Xiaojing Yun1, Yihong Wu, Luyang Yao

  • 1Gene Research Center, Shanghai Medical College of Fudan University, Shanghai 200032, P.R. China.

Molecular and Cellular Biochemistry
|May 23, 2007
PubMed

Insights

Cyclin-dependent kinase 11 (CDK11(p58)) promotes apoptosis in hepatocarcinoma cells by down-regulating the anti-apoptotic protein Bcl-2. Its kinase activity is crucial for this effect, highlighting a new therapeutic target.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Cyclin-dependent kinase 11 (CDK11(p58)) is a G2/M-specific protein kinase implicated in apoptosis.
  • Previous research demonstrated CDK11(p58) enhances cycloheximide (CHX)-induced apoptosis in SMMC-7721 hepatocarcinoma cells.

Purpose of the Study:

  • To elucidate the mechanism by which CDK11(p58) induces apoptosis in hepatocarcinoma cells.
  • To investigate the role of Bcl-2 expression and phosphorylation in CDK11(p58)-mediated apoptosis.

Main Methods:

  • Ectopic expression of CDK11(p58) in SMMC-7721 cells.
  • Analysis of Bcl-2 expression and its phosphorylation at Ser70 and Ser87.
  • Assessment of apoptosis induction.
  • Evaluation of the effect of Bcl-2 overexpression on apoptosis.
  • Inhibition of CDK11(p58) kinase activity.

Main Results:

  • Ectopic CDK11(p58) expression down-regulates Bcl-2 expression and its Ser70, Ser87 phosphorylation during CHX-induced apoptosis.
  • Overexpression of Bcl-2 counteracted the pro-apoptotic effects of CDK11(p58).
  • CDK11(p58) kinase activity was essential for both Bcl-2 down-regulation and apoptosis induction.

Conclusions:

  • CDK11(p58) mediates apoptosis in hepatocarcinoma cells by down-regulating Bcl-2 expression and phosphorylation, dependent on its kinase activity.
  • This mechanism highlights a critical survival signaling pathway in hepatocarcinoma cells that can be targeted by CDK11(p58).

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