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The TGFbeta/Smad 3-signaling pathway is involved in butyrate-mediated vitamin D receptor (VDR)-expression

Carolin Daniel1, Oliver Schroder, Nadine Zahn

  • 1First Department of Internal Medicine, ZAFES, Johann Wolfgang Goethe University, Frankfurt am Main, Germany.

Journal of Cellular Biochemistry
|May 2, 2007
PubMed

Insights

Butyrate enhances colon cancer cell differentiation by upregulating vitamin D receptor (VDR) expression. This process involves the transforming growth factor-beta (TGFbeta)/Smad 3 pathway and p38 MAPK, crucial for VDR regulation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • The vitamin D receptor (VDR) is crucial for butyrate-induced differentiation in colon cancer cells.
  • Smad 3, a transforming growth factor-beta (TGFbeta) signaling component, acts as a VDR coactivator.

Purpose of the Study:

  • To investigate the role of the TGFbeta/Smad 3 pathway in butyrate-mediated VDR expression and colon cancer cell differentiation.
  • To elucidate the mechanisms underlying VDR upregulation by butyrate.

Main Methods:

  • Butyrate treatment of colon cancer cells.
  • Analysis of Smad 3 phosphorylation levels.
  • Inhibition of TGFbeta signaling using antibodies and receptor inhibitors.
  • Assessment of VDR expression.
  • Inhibition of p38 MAPK activity.

Main Results:

  • Butyrate treatment significantly increased Smad 3 phosphorylation.
  • Inhibiting TGFbeta signaling diminished butyrate-induced VDR upregulation.
  • p38 MAPK was involved in the increase of Smad 3 phosphorylation induced by butyrate.

Conclusions:

  • The TGFbeta/Smad 3 pathway distinctly impacts butyrate-mediated VDR expression and colon cancer cell differentiation.
  • p38 MAPK plays a role in mediating VDR upregulation by butyrate in colon cancer cells.

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