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Updated: Mar 20, 2026
Mouse Model of Metabolic Dysfunction-Associated Steatotic Liver Disease with Fibrosis
Published on: July 18, 2025
Hepatocyte specific Rab27a knockout aggravates metabolic dysfunction associated fatty liver disease
Jia-Ying Hu1, Xin-Yi Liao1, Rong-Zheng Ran2
1Department of Hepatobiliary Surgery Center, Shanghai Tongji Hospital, School of Medicine, Tongji University, Shanghai, 200065, China; Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China; Liver and non-liver Comorbidity Research Center, Shanghai Tongji Hospital, School of Medicine, Tongji University, Shanghai, 200065, China.
Loss of hepatocyte Rab27a impairs exosome secretion, worsening metabolic dysfunction-associated fatty liver disease (MAFLD). Hepatocyte-derived exosomes, particularly HMGB1, may offer protection against liver damage and metabolic stress.
Area of Science:
- Hepatology
- Molecular Biology
- Metabolic Diseases
Background:
- Metabolic dysfunction-associated fatty liver disease (MAFLD) is a significant cause of chronic liver disease with unclear molecular mechanisms.
- Exosomes are key mediators of intercellular communication, and Rab27a is a known regulator of exosome release.
- This study investigates the role of hepatocyte-specific Rab27a and its exosomes in MAFLD.
Purpose of the Study:
- To elucidate the role of hepatocyte-specific Rab27a in MAFLD pathogenesis.
- To determine the impact of Rab27a-regulated exosomes on liver health and metabolic function.
- To explore potential therapeutic targets for MAFLD based on exosome function.
Main Methods:
- Quantified Rab27a expression using Western blot.
- Generated hepatocyte-specific Rab27a knockout (Rab27a-HC-KO) mice.
- Assessed hepatic steatosis, liver injury (ALT, AST), glucose tolerance, and serum exosome concentration (nano-flow cytometry).
Main Results:
- High-fat diet (HFD) increased IRF-1-Rab27a signaling and serum exosome levels.
- Rab27a-HC-KO mice showed exacerbated hepatic steatosis, liver injury, and impaired glucose tolerance.
- Loss of Rab27a reduced serum exosome secretion and depleted exosomal HMGB1.
Conclusions:
- Hepatocyte-specific Rab27a is crucial for exosome secretion and mitigating MAFLD.
- Reduced exosome secretion and HMGB1 cargo worsen liver damage and metabolic dysfunction.
- Hepatocyte-derived exosomes and HMGB1 represent potential therapeutic targets for MAFLD.
