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Published on: March 18, 2015

Arsenic trioxide induces G2/M arrest in hepatocellular carcinoma cells by increasing the tumor suppressor PTEN

Xinyu Zhang1, Shuzhao Jia, Shumeng Yang

  • 1Department of Surgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150081, China.

Journal of Cellular Biochemistry
|June 26, 2012
PubMed

Insights

Arsenic trioxide induces G2/M cell cycle arrest in liver cancer cells by upregulating PTEN. This mechanism involves regulating cdc2 and Wee1, crucial for cell division.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Cycle Regulation

Background:

  • Arsenic trioxide (As(2)O(3)) shows efficacy against acute promyelocytic leukemia and inhibits solid tumor cell lines.
  • The molecular mechanisms of As(2)O(3)-induced G2/M arrest and the role of PTEN are not fully understood.

Purpose of the Study:

  • To investigate the role of PTEN in As(2)O(3)-mediated G2/M cell cycle arrest in hepatocellular carcinoma (HCC) cell lines.
  • To elucidate the molecular pathways involved in As(2)O(3) treatment in HCC.

Main Methods:

  • Hepatocellular carcinoma cell lines (HepG2 and SMMC7721) were treated with As(2)O(3).
  • Cell cycle progression was analyzed using flow cytometry.
  • Protein levels and phosphorylation states of cdc2, Wee1, Akt, and PTEN were assessed using Western blotting.
  • PTEN was downregulated using small interfering RNA (siRNA).

Main Results:

  • As(2)O(3) induced a concentration-dependent G2/M phase arrest in HCC cells.
  • This arrest correlated with decreased cdc2, increased phospho-cdc2(Tyr15), increased Wee1, decreased phospho-Wee1(642), decreased Akt phosphorylation, and upregulated PTEN.
  • PTEN downregulation reversed the As(2)O(3)-induced G2/M arrest, affecting Wee1 and cdc2 phosphorylation.

Conclusions:

  • As(2)O(3) induces G2/M cell cycle arrest in HCC cells.
  • PTEN upregulation is a key mechanism in As(2)O(3)-mediated G2/M arrest.
  • The pathway involves the regulation of Wee1 and cdc2 activity.

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