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Short-chain fatty acids induce cell cycle inhibitors in colonocytes

J Wang1, E A Friedman

  • 1Department of Pathology, State University of New York Health Science Center-Syracuse, Syracuse, New York 13210, USA.

Gastroenterology
|May 30, 1998
PubMed
Abstract

Insights

Short-chain fatty acids (SCFAs) from wheat bran fiber effectively inhibit colon cancer cell growth by inducing cell cycle inhibitors. This effect is not mediated by TGF-beta1, highlighting SCFAs as key protective compounds.

Area of Science:

  • Gastroenterology
  • Oncology
  • Molecular Biology

Background:

  • Dietary fibers like pectin, wheat bran, and oat bran yield short-chain organic acids (SCFAs) in the colon.
  • SCFAs are hypothesized to protect against colon cancer by inducing transforming growth factor (TGF)-beta1, which inhibits cell growth via cyclin-directed kinase (cdk) inhibitors.

Purpose of the Study:

  • To investigate the role of SCFAs from dietary fibers in colon cancer prevention.
  • To determine if SCFA-induced inhibition of colon cancer cell growth is mediated by TGF-beta1 and cdk inhibitors.

Main Methods:

  • U4 human colon carcinoma cells were used to model normal colonocytes.
  • Cells were treated with SCFA mixtures mimicking digestion products of wheat bran, oat bran, pectin, and cellulose.
  • Immunoprecipitation and Western blotting assessed cdk/cyclin complex composition and kinase activity.

Main Results:

  • SCFA mixtures rapidly and significantly induced cdk inhibitors (p21cip1 and p27kip1) more than TGF-beta1.
  • Wheat bran-derived SCFA mixtures were most effective in inhibiting cell growth and inducing cdk inhibitors, followed by oat bran and pectin.
  • Cellular response was independent of TGF-beta1 induction.

Conclusions:

  • SCFA induction of cdk inhibitors is not mediated by TGF-beta1.
  • Wheat bran fiber-derived SCFA mixtures demonstrate the highest efficacy in inhibiting colon cancer cell growth through cdk inhibitor induction.

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