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PPARα induces cell apoptosis by destructing Bcl2

Jiaming Gao1,2, Qian Liu1, Ying Xu2

  • 1Department of Oncology, The Affiliated Wujin People's Hospital, Jiangsu University, Changzhou, Jiangsu Province, China.

Oncotarget
|November 12, 2015
PubMed

Insights

Peroxisome-proliferator-activated receptors alpha (PPARα) acts as an E3 ubiquitin ligase, degrading the Bcl2 protein. This mechanism enhances cancer cell sensitivity to chemotherapy, offering a new therapeutic target.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Biochemistry

Background:

  • Peroxisome-proliferator-activated receptors (PPARs) are crucial in regulating cell proliferation and tumorigenesis.
  • The precise molecular mechanisms underlying PPARs' role in cancer are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanism by which PPARα influences cancer cell proliferation and chemoresistance.
  • To investigate the role of PPARα in regulating Bcl2 protein stability.

Main Methods:

  • Co-immunoprecipitation assays to confirm physical binding between PPARα and Bcl2.
  • Ubiquitination assays to detect K48-linked polyubiquitination of Bcl2 at lysine-22.
  • Cellular experiments involving PPARα overexpression and silencing to assess chemotherapy sensitivity.

Main Results:

  • PPARα directly binds to the BH3 domain of Bcl2.
  • PPARα functions as an E3 ubiquitin ligase, mediating K48-linked polyubiquitination and proteasomal degradation of Bcl2.
  • Overexpression of PPARα increases cancer cell sensitivity to chemotherapy, while silencing PPARα reduces it.

Conclusions:

  • PPARα regulates Bcl2 protein stability through ubiquitination and proteasomal degradation.
  • This novel mechanism contributes to reduced cancer cell chemoresistance.
  • PPARα represents a potential therapeutic target for enhancing cancer treatment efficacy.
Keywords:
Bcl2PPARαapoptosisdegradationubiquitination

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