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p12(CDK2-AP1) inhibits breast cancer cell proliferation and in vivo tumor growth

Weibing Zhou1, Xiaoyan Guan, Longyun Wang

  • 1Department of Oncology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, 410008, China.

Journal of Cancer Research and Clinical Oncology
|July 26, 2012
PubMed
Abstract

Insights

p12 (CDK2-associated protein 1) acts as a tumor suppressor in breast cancer. Its downregulation promotes cancer growth, while its restoration inhibits proliferation and tumor development, suggesting therapeutic potential.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Cycle Regulation

Background:

  • p12 (CDK2-associated protein 1) is a known growth suppressor.
  • It negatively regulates cyclin-dependent kinase 2 (CDK2) activity.
  • p12 (CDK2-AP1) has been shown to interfere with DNA replication.

Purpose of the Study:

  • To investigate the role of p12 (CDK2-AP1) in breast cancer progression.
  • To determine if p12 (CDK2-AP1) functions as a tumor suppressor in breast cancer.
  • To explore p12 (CDK2-AP1) as a potential therapeutic target.

Main Methods:

  • Immunohistochemistry was used to assess p12 (CDK2-AP1) protein expression in 60 breast cancer specimens and adjacent non-tumor tissues.
  • Loss-of-function and gain-of-function studies were conducted using lentiviral vectors in MCF-7 and MDA-MB-231 breast cancer cell lines.
  • Cell proliferation (MTT, colony formation), cell cycle distribution (flow cytometry), and in vivo tumorigenesis in nude mice were evaluated.

Main Results:

  • p12 (CDK2-AP1) was significantly downregulated in breast cancer tissues compared to non-tumorous tissues.
  • Overexpression of p12 (CDK2-AP1) inhibited cell proliferation and colony formation, while RNA interference enhanced these abilities.
  • p12 (CDK2-AP1) overexpression induced G0/G1 cell cycle arrest and altered the expression of cell cycle regulators (CDK2, CDK4, p16Ink4A, p21Cip1/Waf1).
  • In vivo studies demonstrated that p12 (CDK2-AP1) overexpression suppressed tumor growth in immunodeficient mice.

Conclusions:

  • p12 (CDK2-AP1) functions as a cell cycle regulator involved in breast cancer development.
  • The downregulation of p12 (CDK2-AP1) contributes to breast cancer progression.
  • p12 (CDK2-AP1) represents a potential therapeutic candidate for suppressing tumorigenicity in breast cancer.

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