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Related Experiment Video

Updated: Dec 27, 2025

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
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The microbiome modulating activity of bile acids.

Yuan Tian1,2, Wei Gui1, Imhoi Koo1

  • 1Department of Veterinary and Biomedical Sciences, The Pennsylvania State University , University Park, Pennsylvania, USA.

Gut Microbes
|March 7, 2020
PubMed
Summary

Bile acids significantly impact gut bacteria, with unconjugated forms being more potent antibacterials. This study reveals mechanisms of bile acid resistance in gut microbes and their effects on host metabolism.

Keywords:
Bile acidbile acid resistanceflow cytometrygrowth rate measurementsgut bacteriamass spectrometrymetabolomicsnmr

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Area of Science:

  • Microbiology
  • Metabolomics
  • Gut Microbiome Research

Background:

  • Bile acids are crucial for gut microbial ecology and possess antibacterial properties.
  • Understanding bile acid-host-microbe interactions is key to gut health.

Purpose of the Study:

  • To systematically profile the impact of bile acids on the gut microbiome.
  • To elucidate mechanisms of bile acid tolerance in bacteria.
  • To investigate the effects of bile acids on host metabolism.

Main Methods:

  • Utilized flow cytometry, growth rate measurements (OD600), and NMR/mass spectrometry-based metabolomics.
  • Employed both in vitro and in vivo models of the gut microbiome.
  • Analyzed bacterial responses to various bile acids, including lithocholic acid.

Main Results:

  • Unconjugated bile acids exhibit stronger antibacterial activity than conjugated forms.
  • Gram-positive bacteria are more susceptible to bile acids than Gram-negative bacteria.
  • Probiotic and 7α-dehydroxylating bacteria display bile acid resistance linked to glycolysis.
  • Lithocholic acid showed reduced toxicity in the cecal microbiome.
  • Bile acids rapidly disrupt bacterial metabolism, affecting membranes and nutrient pathways.
  • In vivo, bile acids altered bacterial communities, impacting host metabolism.

Conclusions:

  • Bile acids differentially affect gut bacteria based on conjugation and Gram status.
  • Specific bacteria possess resistance mechanisms involving metabolic adaptations like glycolysis.
  • Bile acids have direct, rapid metabolic effects on bacteria and indirect effects on the host.
  • This research provides comprehensive insights into bile acid-microbiome interactions and tolerance mechanisms.