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Influence of Bile Acids on Colorectal Cancer Risk: Potential Mechanisms Mediated by Diet-Gut Microbiota Interactions

  • Cancer (MF Leitzmann, Section Editor)
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Abstract

Purpose of Review

The purpose of this study is to review the evidence for the tumorigenic effects of food-stimulated bile acids on the colon and interaction with the gut microbiota.

Recent Findings

High-fat diets promote the hepatic synthesis of bile acids and increase their delivery to the colonic lumen. Here, they stimulate the growth and activity of 7α-dehydroxylating bacteria, which convert primary into secondary bile acids that show tumorigenic activity, especially deoxycholic acid (DCA). Fecal levels of secondary bile acids correlate with mucosal and metabolic markers of colorectal cancer (CRC) risk in high- and low-risk adult individuals and can be modified within a few weeks by dietary change. While gut bacteria regulate the bile acid pool via complex microbial biotransformation, bile acids alter the gut microbiota composition due to their antimicrobial properties. This mutual reaction induces altered bile acid pools and dysbiotic compositions of the gut microbiota that may show tumor-promoting activity of bile acids beyond their conversion to DCA.

Summary

Bile acids act as tumor promoters in the colon. Diet and the gut microbiota are most likely the key drivers that mediate and confer bile acid-associated tumorigenic activity. Bacterial conversion of bile acids in the colon has a significant impact on their tumorigenic activity, substantiating the hypothesis that diet affects CRC risk through its effects on colonic microbial metabolism.

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Acknowledgements

S. Ocvirk is supported by the German Cancer Aid.

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Authors and Affiliations

  1. Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh, S853 Scaife Hall, 3550 Terrace Street, Pittsburgh, PA, 15213, USA

    Soeren Ocvirk & Stephen JD O’Keefe

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  1. Soeren Ocvirk
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Correspondence to Stephen JD O’Keefe.

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Soeren Ocvirk and Stephen J.D. O’Keefe declare they have no conflict of interest.

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This article does not contain any studies with human or animal subjects performed by any of the authors.

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This article is part of the Topical Collection on Cancer

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Ocvirk, S., O’Keefe, S.J. Influence of Bile Acids on Colorectal Cancer Risk: Potential Mechanisms Mediated by Diet-Gut Microbiota Interactions. Curr Nutr Rep 6, 315–322 (2017). https://doi.org/10.1007/s13668-017-0219-5

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