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High-throughput Identification of Synergistic Drug Combinations by the Overlap2 Method
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Combination simvastatin and metformin synergistically inhibits endometrial cancer cell growth

Josephine S Kim1, Jane Turbov2, Rebecca Rosales2

  • 1Division of Gynecologic Oncology, NorthShore University HealthSystem, 2650 Ridge Avenue, Suite 1507, Walgreen Building, Evanston, IL 60201, USA; Section of Gynecologic Oncology, The University of Chicago Medicine, 5841 S. Maryland Avenue, MC 2050, Chicago, IL 60637, USA.

Gynecologic Oncology
|June 11, 2019
PubMed
Abstract

Insights

The combination of simvastatin (SIM) and metformin (MET) synergistically inhibits endometrial cancer cell growth. This effect is mediated by apoptosis and mTOR pathway inhibition, suggesting potential for clinical investigation.

Area of Science:

  • Oncology
  • Pharmacology
  • Molecular Biology

Background:

  • Simvastatin (SIM) and metformin (MET) exhibit anti-proliferative effects on cancer cells.
  • The MET+SIM combination shows promise in prostate cancer models with similarities to early endometrial cancers.

Purpose of the Study:

  • To evaluate the synergistic anti-proliferative effects of MET+SIM in endometrial cancer cells.
  • To investigate the underlying mechanisms, including apoptosis and mTOR pathway modulation.

Main Methods:

  • Endometrial cancer cell lines (RL95-2, HEC1B, Ishikawa) were treated with MET and/or SIM.
  • Cell proliferation was assessed using MTS assays.
  • Apoptosis was evaluated via caspase-3, Annexin V, and TUNEL assays, alongside western blotting for apoptosis markers (BAX, Bcl-2, Bim).
  • mTOR pathway activity was analyzed by western blotting for phospho-AMPK and phospho-S6.

Main Results:

  • MET+SIM demonstrated synergistic growth inhibition across all tested cell lines.
  • The combination treatment significantly induced apoptosis, confirmed by multiple assays.
  • Silencing Bim abrogated the anti-proliferative and pro-apoptotic effects of MET+SIM.
  • Combination therapy led to upregulated phospho-AMPK and downregulated phospho-S6, indicating mTOR inhibition.

Conclusions:

  • MET+SIM synergistically inhibits endometrial cancer cell viability through apoptosis and mTOR pathway interference.
  • These findings provide preclinical support for investigating MET+SIM as a potential endometrial cancer therapy.
Keywords:
ApoptosisEndometrial cancerMetforminStatinmTOR

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