Cited by 1,329Gut microbiota and healthDrug Transport and Resistance MechanismsCholesterol and Lipid Metabolism

Bile acids and the gut microbiome

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Ridlon, Jason M., Kang, Dae J., Hylemon, Phillip B., Bajaj, Jasmohan S.·2014·Current Opinion in Gastroenterology

Abstract

PURPOSE OF REVIEW: We examine the latest research on the emerging bile acid-gut microbiome axis and its role in health and disease. Our focus revolves around two key microbial pathways for degrading bile salts, and the impact of bile acid composition in the gut on the gut microbiome and host physiology. RECENT FINDINGS: Bile acid pool size has recently been shown to be a function of microbial metabolism of bile acids in the intestines. Recent studies have shown potential mechanisms explaining how perturbations in the microbiome affect bile acid pool size and composition. Bile acids are emerging as regulators of the gut microbiome at the highest taxonomic levels. The role of bile acids as hormones and potentiators of liver cancer is also emerging. SUMMARY: The host and microbiome appear to regulate bile acid pool size. The host produces a large, conjugated hydrophilic bile acid pool, maintained through positive-feedback antagonism of farnesoid X receptor (FXR) in intestine and liver. Members of the microbiome utilize bile acids and their conjugates resulting in agonism of FXR in intestine and liver resulting in a smaller, unconjugated hydrophobic bile acid pool. Hydrophilicity of the bile acid pool is associated with disease states. Reduced bile acid levels in the gut are associated with bacterial overgrowth and inflammation. Diet, antibiotic therapy, and disease states affect the balance of the microbiome-bile acid pool.

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  • Microbial mediators of altered intestinal secretion include metabolites from breakdown of dietary polysaccharides and bile acids.

    “Microbial mediators of altered intestinal secretion96 include metabolites from breakdown of dietary polysaccharides as well as bile acids (Table 1).”
  • Microbially-mediated effects on intestinal secretion in IBS may result from differential bile acid biotransformation by the gut microbiome.

    “Microbially-mediated effects on intestinal secretion in IBS may be a consequence of differential bile acid biotransformation by the gut microbiome96.”

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Authors
Ridlon, J. M., Kang, D. J., Hylemon, P. B., & Bajaj, J. S.
Affiliations
Virginia Commonwealth University (US)
Corresponding author
Bajaj, Jasmohan S.
Venue
Current Opinion in Gastroenterology
Published
2014-05
Volume
30
Issue
3
Pages
332-338
ISSN
0267-1379 (ISSN-L)
OpenAlex
W2049506766
Cited by
1,329
References
41
Citations by year
2026: 125 · 2025: 111 · 2024: 122 · 2023: 137 · 2022: 160 · 2021: 158 · 2020: 141 · 2019: 112 · 2018: 87 · 2017: 88 · 2016: 56 · 2015: 24 · 2014: 5
FWCI
5.44
Type
journal article
Language
en
Open access
Locations
  • Current Opinion in Gastroenterology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • U.S. Department of Veterans Affairs (I01 BX001328)
  • National Institute on Alcohol Abuse and Alcoholism (R01AA020203)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK087913)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
bile acids, gut microbiota, bile acid pool size, farnesoid X receptor, bile acid conjugates, liver cancer, bacterial overgrowth, intestinal inflammation, diet, antibiotic therapy
MeSH terms
Bile Acids and Salts, Cell Transformation, Neoplastic, Cholesterol 7-alpha-Hydroxylase, Humans, Intestinal Mucosa, Intestines, Liver Neoplasms, Microbiota

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