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Molecular mechanisms of cell cycle block by methionine restriction in human prostate cancer cells

S Lu1, D E Epner

  • 1Department of Medicine, Baylor College of Medicine and Veterans Affairs Medical Center, Houston, TX 77030, USA.

Nutrition and Cancer
|May 9, 2001
PubMed

Insights

Methionine restriction inhibits prostate cancer cell growth by halting cell cycle progression and inducing apoptosis. This dietary intervention shows promise as a novel prostate cancer treatment strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Nutritional Science

Background:

  • Previous research indicates methionine restriction (MR) inhibits human prostate cancer cell growth.
  • The precise molecular mechanisms underlying MR's anti-cancer effects require further elucidation.

Purpose of the Study:

  • To investigate the molecular mechanisms by which methionine restriction impacts prostate cancer cell proliferation and survival.
  • To determine the effects of MR on cell cycle progression and apoptosis in different prostate cancer cell lines.

Main Methods:

  • Utilized PC-3, DU 145, and LNCaP human prostate cancer cell lines.
  • Employed cell culture with homocysteine in place of methionine to induce methionine restriction.
  • Assessed cell proliferation, cell cycle distribution via flow cytometry, protein levels via Western blot, and apoptosis via DNA gel electrophoresis.

Main Results:

  • Methionine restriction halted proliferation in PC-3 and DU 145 cells, with partial inhibition in LNCaP cells.
  • MR induced cell cycle arrest, predominantly in G2/M phase for PC-3 cells and G1 phase for LNCaP cells.
  • Accumulation of p21 and p27, inhibition of CDK2 and cdc2 kinase activity, and induction of apoptosis were observed in PC-3 cells.

Conclusions:

  • Methionine restriction effectively inhibits prostate cancer cell growth through cell cycle arrest and apoptosis induction.
  • MR demonstrates potential as a novel therapeutic strategy for prostate cancer treatment.

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