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Proanthocyanidin from grape seeds inactivates the PI3-kinase/PKB pathway and induces apoptosis in a colon cancer cell

A-M Engelbrecht1, M Mattheyse, B Ellis

  • 1Department of Physiological Sciences, Stellenbosch University, Stellenbosch, South Africa. ame@sun.ac.za

Cancer Letters
|October 10, 2007
PubMed

Insights

Grape seed proanthocyanidin extract (GSPE) shows chemopreventative potential against colon cancer. GSPE inhibited colon cancer cell viability and increased apoptosis by suppressing the PI3-kinase survival pathway.

Area of Science:

  • Oncology
  • Molecular Biology
  • Natural Products Chemistry

Background:

  • Colon cancer remains a significant global health challenge.
  • Chemoprevention using natural compounds offers a promising strategy.
  • Grape seed proanthocyanidin extract (GSPE) is rich in bioactive polyphenols.

Purpose of the Study:

  • To evaluate the chemopreventative and antiproliferative effects of GSPE on colon cancer cells (CaCo2).
  • To elucidate the mechanism of action of GSPE in colon cancer cells.

Main Methods:

  • Treatment of CaCo2 cells and normal colon cells (NCM460) with varying concentrations of GSPE.
  • Assessment of cell viability using standard assays.
  • Induction of apoptosis and analysis of key proteins in the PI3-kinase pathway (PI3K, PKB).

Main Results:

  • GSPE significantly inhibited viability and induced apoptosis in CaCo2 cells.
  • GSPE did not affect the viability of normal colon cells (NCM460).
  • Apoptosis induction correlated with reduced PI3-kinase signaling (p110, p85 subunits) and decreased PKB phosphorylation.

Conclusions:

  • GSPE exhibits selective antiproliferative effects against colon cancer cells.
  • GSPE exerts its beneficial effects through enhanced apoptosis.
  • GSPE suppresses the PI3-kinase/PKB survival pathway, suggesting a potential chemopreventative role.

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