ArticleMolecular biomedicine2026
Curcumin alleviates metabolic dysfunction-associated steatotic liver disease via gut microbiota-dependent epigenetic alterations.
Article in Molecular biomedicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Metabolic dysfunction-associated steatotic liver disease (MASLD) is increasingly prevalent, yet effective therapies remain limited. Curcumin (Cur), a polyphenol with well-documented metabolic benefits, shows therapeutic promise in MASLD, but its efficacy and underlying mechanisms remain incompletely understood. A meta-analysis of seven clinical studies indicated that Cur supplementation reduced serum aminotransferase levels, supporting its potential clinical benefit. In high-fat diet (HFD)-fed rats, Cur reduced hepatic lipid accumulation and metabolic dysfunction, whereas these effects were markedly weakened in antibiotic-induced pseudo-germ-free rats, indicating microbiota dependence. Fecal microbiota transplantation from Cur-treated donors transferred these metabolic and histological benefits to antibiotic-conditioned recipients. Fecal 16S rRNA sequencing identified Clostridium_sensu_stricto_1 (C. sensu) as a Cur-suppressed, pro-steatotic taxon, and targeted reconstitution of this taxon abolished Cur-mediated protection. Untargeted hepatic metabolomics and liquid chromatography-mass spectrometry identified kynurenine (KYN) as a C. sensu-derived metabolite and showed that Cur reduced hepatic KYN accumulation. Integrated H3K27ac ChIP-seq, bulk RNA-seq, and single-cell analyses pinpointed hepatocyte-enriched CEBPB as a key epigenetically regulated effector. Luciferase reporter assays, ChIP-qPCR, and gain- and loss-of-function experiments showed that KYN activated the aryl hydrocarbon receptor (AHR), increased H3K27ac enrichment at the Cebpb locus, and induced Cebpb transcription. CEBPB knockdown blocked KYN-induced PI3K-AKT activation and lipid accumulation, whereas in vivo KYN supplementation largely reversed Cur-mediated protection. Collectively, this study reveals a novel gut-liver axis in MASLD pathogenesis, demonstrating that Cur alleviates hepatic steatosis by targeting the microbiota-KYN-AHR-H3K27ac-Cebpb epigenetic axis, positioning Cur supplementation and KYN modulation as promising therapeutic strategies for MASLD intervention.
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