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Related Experiment Videos

Bile acid induces hydrophobicity-dependent membrane alterations.

Sandeep Akare1, Jesse D Martinez

  • 1Arizona Cancer Center, Department of Cell Biology and Anatomy, University of Arizona, 1515 N. Campbell Avenue, Tucson, Arizona 85724, United States.

Biochimica Et Biophysica Acta
|June 14, 2005
PubMed
Summary

Hydrophobic bile acids alter colon cell membranes by increasing cholesterol and phospholipids, impacting cellular signaling and potentially increasing colon cancer risk. These changes, not membrane disruption, are key to bile acid

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Elevated fecal bile acids are linked to colon cancer risk.
  • Bile acid-induced membrane alterations in colonic cells are poorly understood.
  • Hydrophobicity is proposed to drive these membrane changes.

Purpose of the Study:

  • To investigate the determinants and characteristics of bile acid-induced membrane alterations.
  • To use PKCalpha activation and cholesterol up-regulation as indicators.
  • To elucidate the role of hydrophobicity in bile acid signaling.

Main Methods:

  • Examined bile acid-induced PKCalpha and ERK1/2 activation.
  • Measured changes in membrane lipid composition (cholesterol, phospholipids).
  • Assessed caveolin-1 modification and up-regulation.

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  • Used unrelated hydrophobic molecules to mimic effects.

    • Main Results:

    • Bile acid-induced PKCalpha activation depends on hydrophobicity.
    • Significant up-regulation of membrane cholesterol and phospholipids observed.
    • Bile acids altered membrane composition without causing disruption.
    • Hydrophobic bile acids induced caveolin-1 modification and ERK1/2 activation.
    • Effects mimicked by non-bile acid hydrophobic molecules.

    Conclusions:

    • Hydrophobicity is a critical determinant of bile acid-induced membrane alterations and signaling.
    • These alterations involve changes in membrane lipid composition and caveolin-1.
    • The findings suggest hydrophobicity-induced membrane stress contributes to colon cancer risk.