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Protection of human colon epithelial cells against deoxycholate by rottlerin

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Abstract

The bile salt, deoxycholate (DOC), can harm cells and cause disease. Hence, there is interest in identifying compounds capable of protecting cells against DOC. In HCT-116 colon epithelial cells, DOC increased generation of reactive oxygen species and caused DNA damage and apoptosis. These effects of DOC were inhibited by rottlerin, which is a phenolic compound of plant origin. In elucidating its mechansim, rottlerin prevented the release of cytochrome c from mitochondria into cytosol, and also prevented the cleavage of caspase-3. Yet, rottlerin by itself markedly decreased mitochondrial membrane potential and increased mitochondrial superoxide production, but this did not result in cytochrome c release or in caspase-3 cleavage. At a higher test concentration, two other phenolic phytochemicals, namely, quercetin and resveratrol, were each able to largely prevent the occurrence of apoptosis in cells exposed to DOC. In contrast, epigallocatechin gallate, curcumin, and genistein were ineffective.

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Acknowledgements

This study was supported by the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service (grant number 2006-35200-16578), and also by the North Carolina Agricultural Research Service (NC06659).

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  1. Cellular and Molecular Nutrition Research Laboratory, Department of Nutrition, University of North Carolina at Greensboro, Greensboro, NC, 27402-6170, USA

    Jennifer M. Longpre & George Loo

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  1. Jennifer M. Longpre
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  2. George Loo
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Correspondence to George Loo.

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Longpre, J.M., Loo, G. Protection of human colon epithelial cells against deoxycholate by rottlerin. Apoptosis 13, 1162–1171 (2008). https://doi.org/10.1007/s10495-008-0244-3

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