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Current Nutrition Reports

, Volume 6, Issue 4, pp 315–322 | Cite as

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

  • Soeren Ocvirk
  • Stephen JD O’KeefeEmail author
Cancer (MF Leitzmann, Section Editor)
Part of the following topical collections:
  1. Topical Collection on Cancer

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.

Keywords

Colorectal cancer High-fat diet Bile acids Gut microbiota Deoxycholic acid 

Notes

Acknowledgements

S. Ocvirk is supported by the German Cancer Aid.

Compliance with Ethical Standards

Conflict of Interest

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

Human and Animal Rights and Informed Consent

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

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Division of Gastroenterology, Hepatology and NutritionUniversity of PittsburghPittsburghUSA

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