Developing Microbial Therapy for MASLD: From Mechanism to Clinical Validation

Metabolic dysfunction-associated steatotic liver disease (MASLD), redefined in 2020, is an improved diagnostic standard evolved from non-alcoholic fatty liver disease (NAFLD), emphasizing the correlation between hepatic steatosis and metabolic dysfunction. Compared to NAFLD, which relies on exclusion-based diagnosis, MASLD criteria enhance population homogeneity in studies and accommodate patients with coexisting liver diseases, thereby improving the efficiency and relevance of drug development. MASLD affects approximately one-quarter of the global population. If left untreated, it may progress to liver fibrosis, cirrhosis, or hepatocellular carcinoma. Given its high clinical burden and the current lack of FDA-approved therapies, effective treatments for MASLD are urgently needed. Previous studies suggest that diet and gut microbiota play crucial roles in the pathogenesis of MASLD. Dietary composition influences microbial balance and intestinal barrier function. In dysbiosis, gut-derived harmful substances such as pathogen-associated molecular patterns (PAMPs) and microbiota-derived metabolites (MDMs) may translocate via a leaky gut to the liver through the portal vein, contributing to hepatic injury. These processes, often described as the gut-liver axis, remain incompletely understood. Animal studies have shown that dietary components regulating gut microbiota may help alleviate MASLD. While clinical evidence remains limited, incorporating microbiota-modulating and immune…

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