Across three murine acute liver injury models, hepatotoxin-induced intestinal barrier breakdown drives gut-liver dysbiosis, microbial translocation, and immune-mediated liver injury, and transplanting fecal or liver microbiota from ALI mice into microbiota-depleted recipients was sufficient to reproduce liver injury, immune activation, and intestinal barrier disruption.
Each of three hepatotoxin-based murine ALI models recapitulated distinct features of human ALI and produced unique patterns of hepatic and intestinal injury.
Hepatotoxin-induced injury enabled progressive translocation of live bacteria from the gut to the liver and bloodstream.
ALI was consistently associated with depletion of commensal bacterial taxa and enrichment of opportunistic pathogens.
Dysbiosis in ALI included changes in the virome: reduced gut bacteriophages and expansion of viral families in the liver and blood.
Transplanting fecal or liver microbiota from ALI mice into microbiota-depleted recipients reproduced liver injury, immune activation, and intestinal barrier disruption.
The transplanted dysbiotic communities activated Th1/Th17-associated pathways and expanded pro-inflammatory immune populations.
Direct comparison of fecal- versus liver-derived microbiota revealed distinct mechanistic roles for each in driving liver pathology.
Across all models, hepatotoxin-induced intestinal barrier breakdown drives gut-liver dysbiosis, microbial translocation, and immune-mediated liver injury.
This study in mice looked at how sudden liver damage caused by toxic chemicals is connected to the gut. Using three different mouse models of acute liver injury, the researchers found that the toxins damaged the gut lining, allowing live bacteria to move from the intestine into the liver and bloodstream. At the same time, helpful gut bacteria declined and potentially harmful ones increased, and gut viruses that infect bacteria decreased while other viruses increased in the liver and blood. The researchers then transferred gut or liver microbes from injured mice into mice whose own microbes had been removed. These recipients developed liver injury, immune activation, and gut barrier damage, suggesting that the altered microbial communities alone can trigger liver inflammation. The microbes activated inflammatory immune pathways, including those involving Th1/Th17 cells. Gut-derived and liver-derived microbes appeared to play different roles in causing liver damage. This research suggests that acute liver injury is not only caused by the toxin itself but also by a harmful loop involving gut barrier breakdown, microbial imbalance, and immune activation. It points to the gut-liver connection as a possible target for future treatments, though these findings come from mouse models and would need testing in humans.
Halder U, Hamida H, Kakar K, Yang X, Zhong Y, Nagarkatti M, et al.. (2026). Acute liver injury is triggered by dysbiosis and microbial translocation involving gut-liver axis.. Gut microbes. https://doi.org/10.1080/19490976.2026.2749977