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Soluble dietary fiber boosts beneficial gut bacteria, specifically Bacteroides acidifaciens. This enhances liver health by reducing alcohol-associated liver injury in mice through activating a key liver enzyme.

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Area of Science:

  • Microbiology
  • Hepatology
  • Nutrition Science

Background:

  • Alcohol-associated liver disease (ALD) is a significant global health issue with limited therapeutic options.
  • The gut microbiome plays a crucial role in the pathogenesis and progression of ALD.
  • Dietary interventions are being explored for their potential to modulate the gut microbiome and mitigate liver injury.

Purpose of the Study:

  • To investigate the impact of soluble dietary fiber on the gut microbiome composition in the context of alcohol consumption.
  • To determine if specific bacterial species enhanced by fiber can ameliorate alcohol-induced liver damage.
  • To elucidate the molecular mechanisms by which these beneficial bacteria exert their protective effects on the liver.

Main Methods:

  • Mice were administered alcohol and fed diets supplemented with soluble dietary fiber.
  • Gut microbiota composition was analyzed using 16S rRNA sequencing.
  • Liver injury was assessed through histological examination and biochemical markers.
  • Hepatic ornithine aminotransferase (OAT) activity was measured.

Main Results:

  • Soluble dietary fiber significantly increased the abundance of intestinal Bacteroides acidifaciens.
  • Mice receiving fiber supplementation showed reduced alcohol-induced liver injury compared to control groups.
  • Enhanced Bacteroides acidifaciens levels correlated with increased hepatic ornithine aminotransferase activity.
  • Activation of hepatic ornithine aminotransferase was identified as a key mechanism for liver protection.

Conclusions:

  • Soluble dietary fiber promotes the growth of beneficial gut bacteria like Bacteroides acidifaciens.
  • Bacteroides acidifaciens ameliorates alcohol-associated liver injury in mice, offering a potential therapeutic strategy.
  • The mechanism involves the activation of hepatic ornithine aminotransferase, highlighting a link between gut bacteria and liver metabolism.