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Area of Science:

  • Microbiology
  • Hepatology
  • Metabolomics

Background:

  • Chronic alcohol consumption is a leading cause of liver damage.
  • Alcohol intake significantly alters gut microbiota composition and function.
  • The direct metabolic role of gut microbes in alcohol-induced liver disease remains unclear.

Purpose of the Study:

  • To investigate the metabolic impact of alcohol on gut microbiota using mouse models.
  • To determine if gut microbiota directly metabolize ethanol.
  • To elucidate the mechanisms linking alcohol consumption, gut microbiota, and liver disease.

Main Methods:

  • Utilized isotope-labeled [1-13C] ethanol in ethanol-feeding and intragastric mouse models.
  • Employed metagenomics and metatranscriptomics to analyze gut microbial changes.
  • Measured liver, plasma, and cecum acetate and ethanol metabolite levels.

Main Results:

  • Isotope-labeled ethanol was found in liver, plasma, and cecum, but not metabolized by gut microbiota ex vivo.
  • Gut microbiota activated acetate dissimilation in response to ethanol feeding, not direct ethanol metabolism.
  • Elevated blood acetate concentrations correlated with ethanol consumption, and glyceryl triacetate supplementation mimicked microbiota alterations without affecting liver disease.

Conclusions:

  • Ethanol is not directly metabolized by the gut microbiota.
  • Alcohol-induced gut microbiota alterations are a consequence of elevated systemic acetate levels.
  • Accounting for acetate effects is crucial for understanding the gut microbiota's role in alcohol-related liver disease.