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Lean NAFLD: A Distinct Entity Shaped by Differential Metabolic Adaptation.

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Lean nonalcoholic fatty liver disease (NAFLD) involves distinct bile acid and gut microbiome profiles. Understanding these metabolic differences offers new therapeutic avenues for NAFLD patients.

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Area of Science:

  • Hepatology
  • Gastroenterology
  • Metabolic Diseases

Background:

  • Nonalcoholic fatty liver disease (NAFLD) affects 25% of adults.
  • A subset of NAFLD patients are lean, with poorly understood pathophysiology.
  • Investigating lean NAFLD is crucial for understanding disease heterogeneity.

Purpose of the Study:

  • To explore the roles of bile acids (BAs) and gut microbiome in lean NAFLD pathogenesis.
  • To compare metabolic and genetic factors between lean and nonlean NAFLD patients.
  • To identify potential therapeutic targets for lean NAFLD.

Main Methods:

  • Analyzed serum BAs, fibroblast growth factor (FGF) 19, and genetic variants (PNPLA3, TM6SF2) in 538 NAFLD patients and 30 lean controls.
  • Characterized gut microbiota profiles in patients and murine models.
  • Utilized a murine model treated with an apical sodium-dependent BA transporter inhibitor (SC-435).

Main Results:

  • Lean NAFLD patients exhibited more favorable metabolic and histological profiles.
  • Higher secondary BA and FGF19 levels, with reduced C4, were observed in lean NAFLD, particularly in early fibrosis stages.
  • Distinct gut microbiota profiles were identified in lean NAFLD patients and murine models.
  • SC-435 treatment improved steatohepatitis in lean mice, altering BA and microbiota profiles.

Conclusions:

  • Metabolic adaptations differentiate lean from nonlean NAFLD.
  • Bile acid and gut microbiome alterations are key in lean NAFLD pathophysiology.
  • These findings suggest novel therapeutic strategies for lean NAFLD.