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Conjugated linoleic acids (CLAs) regulate the expression of key apoptotic genes in human breast cancer cells

Barun Majumder1, Klaus W J Wahle, Susanne Moir

  • 1Unit of Surgical Oncology, Aberdeen University Medical School, Foresterhill, Aberdeen AB25 9ZD, Scotland.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|September 3, 2002
PubMed

Insights

Conjugated linoleic acid (CLA) promotes apoptosis in human breast cancer cells by affecting key genes. These findings reveal CLA

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Conjugated linoleic acid (CLA) has demonstrated antitumor properties in preclinical models.
  • CLA has been shown to induce apoptosis and reduce antiapoptotic protein expression in mammary tissues.
  • Understanding the precise cellular mechanisms of CLA's antitumor effects is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the cell mechanisms underlying the antitumor effects of CLA in human breast cells.
  • To analyze changes in the expression of key proapoptotic and antiapoptotic genes (p53, p21WAF1/CIP1, bax, bcl-Xs, bcl-2) at both mRNA and protein levels.
  • To differentiate the effects of CLA from its precursor, linoleic acid (LA).

Main Methods:

  • Cultured human mammary cell lines (MCF-7, MDA-MB-231, MCF-10a) were treated with CLA and linoleic acid (LA).
  • Gene expression analysis was performed using quantitative real-time PCR for mRNA and Western blotting for protein.
  • Cell proliferation and DNA damage (apoptosis) were assessed to evaluate the functional impact of CLA treatment.

Main Results:

  • CLA, but not LA, inhibited proliferation across all tested cell lines, with CLA mix being most effective.
  • CLA treatment led to increased DNA damage, indicating apoptosis induction.
  • In MCF-7 and MCF-10a cells, CLA upregulated proapoptotic genes (p53, p21WAF1/CIP1) and downregulated or had no effect on antiapoptotic bcl-2.
  • In MDA-MB-231 cells with mutant p53, CLA increased p21WAF1/CIP1 and bcl-2 mRNA, and notably, completely suppressed mutant p53 protein, while increasing proapoptotic proteins Bax and Bcl-Xs.

Conclusions:

  • Conjugated linoleic acid (CLA) primarily elicits proapoptotic effects in human breast tumor cells.
  • These proapoptotic effects are mediated through both p53-dependent and p53-independent pathways.
  • The specific mechanisms are cell-type dependent, highlighting the complexity of CLA's action in breast cancer.

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