Groundbreaking Study Reveals Novel Gut-Liver Pathway for Quercetin’s Anti-Obesity Effects

Researchers from Zhejiang University have uncovered a sophisticated gut-liver signaling axis through which quercetin, a dietary flavonoid, combats obesity. Published in Advanced Science (January 31, 2025), the study identifies Akkermansia muciniphilabacteria and bile acid Metabolism as critical mediators ofquercetin’s lipid-lowering effects, offering new theRapeutic targets for metabolic disorders.

Research Background

Obesity and related metabolic diseases pose global health challenges, driving interest in natural interventions like quercetin. Despite its known efficacy, the precise mechanism linking Quercetin to gut microbiota remodeling and metabolic regulation remained unexplored. This study bridges this gap by investigating how quercetin reshapes microbial ecosystems to inhibit lipid accumulation.

Key Findings

1. Metabolic Improvements:
   Quercetin supplementation in high-fat diet (HFD)-fed mice:

   • Reduced body weight and fat mass
   • Alleviated insulin resistance and dyslipidemia

2. Gut Microbiota Remodeling:
   16S rRNA sequencing revealed quercetin:

   • Enriched Akkermansia muciniphila abundance (>3-fold increase)
   • Restored HFD-disrupted microbial diversity

3. Microbial Metabolite Signaling:
   A. muciniphila produced indole-3-lactic acid (ILA), which:

   • Activated the FTO-mediated m6A demethylation pathway
   • Upregulated hepatic CYP8B1 expression (key enzyme for bile acid synthesis)

4. Bile Acid-Mediated Lipid Regulation:
   CYP8B1-driven cholic acid (CA) synthesis activated adipose tissue Farnesoid X Receptor (FXR), resulting in:

   • Suppressed de novo lipogenesis (SREBP1c↓, FAS↓)
   • Enhanced lipid oxidation (PPARα↑)

Mechanistic Validation

• Germ-free mice transplanted with A. muciniphila replicated quercetin’s anti-obesity effects.
• ILA administration reduced lipid accumulation via FTO/m6A/CYP8B1 signaling.
• FXR knockout abolished quercetin’s lipid-lowering benefits, confirming pathway necessity.

Significance and Implications

"This work establishes the quercetin–Akkermansia–ILA/CA/FXR axis as a master regulator of lipid metabolism," states corresponding author Prof. Xinxia Wang. "Targeting this gut-liver circuit provides a novel strategy for obesity therapeutics beyond conventional approaches." The findings highlight microbiome modulation as a viable route for natural product development.