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Metformin induces apoptosis of pancreatic cancer cells

Luo-Wei Wang1, Zhao-Shen Li, Duo-Wu Zou

  • 1Department of Gastroenterology, Changhai Hospital, Second Military Medical University, Shanghai 200433, China.

World Journal of Gastroenterology
|December 17, 2008
PubMed
Abstract

Insights

Metformin effectively inhibits pancreatic cancer cell proliferation by inducing apoptosis through caspase activation and cell cycle arrest. This study elucidates the mechanisms by which metformin targets pancreatic cancer cells.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Pancreatic cancer is a highly lethal malignancy with limited treatment options.
  • Metformin, a common antidiabetic drug, has shown potential anticancer properties.
  • Understanding metformin's mechanism in pancreatic cancer is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the role of metformin in inducing apoptosis in pancreatic cancer cells.
  • To elucidate the molecular mechanisms underlying metformin-induced apoptosis.
  • To assess the impact of metformin on cell proliferation and cell cycle progression.

Main Methods:

  • Human pancreatic cancer cell lines (ASPC-1, BxPc-3, PANC-1, SW1990) were treated with metformin.
  • Cell proliferation was assessed using MTS assays.
  • Apoptosis, cell cycle distribution, and caspase activation were analyzed by flow cytometry and Western blotting.
  • The role of specific caspases was evaluated using inhibitors.

Main Results:

  • Metformin inhibited pancreatic cancer cell proliferation in a dose-dependent manner.
  • Metformin induced apoptosis and S phase arrest in all tested cell lines.
  • Metformin treatment led to poly-ADP-ribose polymerase (PARP) cleavage, indicating caspase activation.
  • Metformin reduced epidermal growth factor receptor (EGFR) and phosphorylated mitogen-activated protein kinase (P-MAPK) levels.

Conclusions:

  • Metformin significantly inhibits pancreatic cancer cell proliferation and induces apoptosis.
  • Metformin-induced apoptosis is mediated by PARP cleavage and the activation of caspase-3, -8, and -9.
  • Both caspase-8 and caspase-9 signaling pathways are involved in metformin-induced apoptosis in pancreatic cancer.

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