XCR1+ type 1 conventional dendritic cells drive liver pathology in non-alcoholic steatohepatitis

Single-cell analyses reveal cDC1 as conserved immunological drivers of non-alcoholic steatohepatitis in mice and humans Non-alcoholic fatty liver disease (NAFLD) and non-alcoholic steatohepatitis (NASH) are prevalent liver conditions that underlie the development of life-threatening cirrhosis, liver failure and liver cancer. Chronic necro-inflammation is a critical factor in development of NASH, yet the cellular and molecular mechanisms of immune dysregulation in this disease are poorly understood. Here, using single-cell transcriptomic analysis, we comprehensively profiled the immune composition of the mouse liver during NASH. We identified a significant pathology-associated increase in hepatic conventional dendritic cells (cDCs) and further defined their source as NASH-induced boost in cycling of cDC progenitors in the bone marrow. Analysis of blood and liver from patients on the NAFLD/NASH spectrum showed that type 1 cDCs (cDC1) were more abundant and activated in disease. Sequencing of physically interacting cDC-T cell pairs from liver-draining lymph nodes revealed that cDCs in NASH promote inflammatory T cell reprogramming, previously associated with NASH worsening. Finally, depletion of cDC1 in XCR1(DTA) mice or using anti-XCL1-blocking antibody attenuated liver pathology in NASH mouse models. Overall, our study provides a comprehensive characterization of cDC biology in NASH and identifies XCR1(+) cDC1 as an important driver of liver pathology.

Automated summary

Single-cell analyses reveal cDC1 as conserved immunological drivers of non-alcoholic steatohepatitis in mice and humans. The study identified the significant role of cDC1 in NASH and confirmed their importance in liver pathology.