Large procyanidins prevent bile-acid-induced oxidant production and membrane-initiated ERK1/2, p38, and Akt activation in Caco-2 cells

Mathieu Da Silva, Grayson K. Jaggers, Sandra V. Verstraeten, Alejandra G. Erlejman, Cesar G. Fraga, Patricia I. Oteiza

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

Procyanidins are oligomers of flavanol subunits present in large amounts in fruits and vegetables. Their consumption is associated with health benefits against colonic inflammation and colorectal cancer (CRC). Large procyanidins (with more than three subunits) are not absorbed by intestinal epithelial cells but could exert biological actions through their interactions with the cell membrane. This study investigated the capacity of hexameric procyanidins (Hex) to prevent oncogenic events initiated by deoxycholic acid (DCA), a secondary bile acid linked to the promotion of CRC. Hex interacted with Caco-2 cell membranes preferentially at the water-lipid interface. Hex (2.5-20 μM) inhibited DCA-triggered increase in cellular calcium, NADPH oxidase activation, and oxidant production. DCA promoted the activation of protein kinase B (Akt), of the mitogen-activated protein kinases ERK1/2 and p38, and of the downstream transcription factor AP-1. This activation was not triggered by calcium or oxidant increases. Hex caused a dose-dependent inhibition of DCA-mediated activation of all these signals. DCA also triggered alterations in the cell monolayer morphology and apoptotic cell death, events that were delayed by Hex. The capacity of large procyanidins to interact with the cell membrane and prevent those cell membrane-associated events can in part explain the beneficial effects of procyanidins on CRC.

Original languageEnglish (US)
Pages (from-to)151-159
Number of pages9
JournalFree Radical Biology and Medicine
Volume52
Issue number1
DOIs
StatePublished - Jan 1 2012

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Keywords

  • Bile acids
  • Colorectal cancer
  • Flavonoids
  • Free radicals
  • Intestinal epithelial cells
  • MAPK
  • Membrane
  • NADPH oxidase
  • Procyanidins

ASJC Scopus subject areas

  • Biochemistry
  • Physiology (medical)

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