A fast and accurate mouse model for inducing non-alcoholic steatohepatitis

This study aimed to perform a head-to-head comparison of changes during NASH progression throughout 6-11 weeks of an experiment to supply a faster nutritional model in mimicking NASH to decrease the duration and cost of in vivo studies.

New therapies are urgently needed because of the growing prevalence of non-alcoholic steatohepatitis (NASH) and the lack of an effective treatment approach. Currently, dietary interventions are the most efficient options.

This study compared features of NASH in a murine model using protocol that combined special nutritional regimes based on the combination of 21.1% fat, 41% sucrose, and 1.25% cholesterol with weekly intraperitoneal injections of carbon tetrachloride (CCl4). Male C57BL/6J mice received either special compositions + CCl4 (NASH group) or standard chow diet (healthy control group) for 11 weeks. Liver histopathology based on hematoxylin and eosin (H&E) and Masson's Trichrome (TC) staining and biochemical analyses were used to assess disease progression.

In C57BL/6J mice administered a high fat, high cholesterol, high sucrose diet and CCl4 for 8 weeks, steatohepatitis with pronounced hepatocyte ballooning, inflammation, steatosis, and fibrosis was observed. According to the NAFLD activity scoring system, the maximum NAS score was manifested after 8-9 weeks (NAS score: 6.75). Following this protocol also led to a significant increase in AST and ALT, total cholesterol, and total triglyceride serum levels in the NASH group.

Following the special nutritional regime based on high fat, cholesterol, and sucrose in combination with CCL4 injections resulted in a NASH model using C57BL/6J mice in a shorter time compared to similar studies. The obtained histopathological NASH features can be advantageous for preclinical drug testing.