- Duan, Yi;
- Chu, Huikuan;
- Brandl, Katharina;
- Jiang, Lu;
- Zeng, Suling;
- Meshgin, Nairika;
- Papachristoforou, Eleni;
- Argemi, Josepmaria;
- Mendes, Beatriz G;
- Wang, Yanhan;
- Su, Hua;
- Sun, Weizhong;
- Llorente, Cristina;
- Hendrikx, Tim;
- Liu, Xiao;
- Hosseini, Mojgan;
- Kisseleva, Tatiana;
- Brenner, David A;
- Bataller, Ramon;
- Ramachandran, Prakash;
- Karin, Michael;
- Fu, Wenxian;
- Schnabl, Bernd
Complement receptor of immunoglobulin superfamily (CRIg) is expressed on liver macrophages and directly binds complement component C3b or Gram-positive bacteria to mediate phagocytosis. CRIg plays important roles in several immune-mediated diseases, but it is not clear how its pathogen recognition and phagocytic functions maintain homeostasis and prevent disease. We previously associated cytolysin-positive Enterococcus faecalis with severity of alcohol-related liver disease. Here, we demonstrate that CRIg is reduced in liver tissues from patients with alcohol-related liver disease. CRIg-deficient mice developed more severe ethanol-induced liver disease than wild-type mice; disease severity was reduced with loss of toll-like receptor 2. CRIg-deficient mice were less efficient than wild-type mice at clearing Gram-positive bacteria such as Enterococcus faecalis that had translocated from gut to liver. Administration of the soluble extracellular domain CRIg-Ig protein protected mice from ethanol-induced steatohepatitis. Our findings indicate that ethanol impairs hepatic clearance of translocated pathobionts, via decreased hepatic CRIg, which facilitates progression of liver disease.