New Rat Model of Advanced NASH Mimicking Pathophysiological Features and Transcriptomic Signature of The Human...

Area of Science:

• Hepatology
• Pre-clinical research
• Animal models

Background:

• Non-alcoholic steatohepatitis (NASH) is a leading cause of chronic liver disease.
• Existing animal models often fail to replicate the full spectrum of human NASH.
• Advanced NASH is characterized by liver fibrosis and portal hypertension, critical prognostic indicators.

Purpose of the Study:

• To develop a novel, multi-hit rat model of NASH.
• To accurately recapitulate advanced human NASH, including fibrosis and portal hypertension.
• To validate the model through transcriptomic analysis and comparison with human NASH.

Main Methods:

• Male rats were subjected to a multi-hit protocol: high-fat, high-cholesterol diet, carbon tetrachloride (CCl4), and phenobarbital.
• Disease progression was monitored over 24 weeks.
• Transcriptomic analysis using next-generation sequencing was performed on liver tissue.
• Pathway enrichment analysis compared rat and human NASH transcriptomes.

Main Results:

• The rat model developed characteristics of advanced NASH within 10 weeks and cirrhosis by 24 weeks.
• Key NASH features observed include steatosis, metabolic syndrome, lipotoxicity, hepatocellular injury, inflammation, significant hepatic fibrosis, and portal hypertension.
• Transcriptomic analysis revealed similarities between the rat model and human NASH, with shared pathways in cell death, inflammation, and matrix remodeling.

Conclusions:

• A novel multi-hit rat model effectively replicates moderate to advanced human NASH.
• This pre-clinical model exhibits key pathophysiological features and a similar transcriptomic signature to human NASH.
• The developed rat model serves as a valuable tool for investigating NASH pathophysiology and evaluating therapeutic strategies.