Hepatic ischemia/reperfusion (I/R) injury may arise after partial hepatectomy and liver transplantation. Neutrophil extracellular traps (NETs) were involved in hepatic I/R injury. This study tested the hypothesis that blocking NETs formation could be a potential therapeutic target against hepatic I/R injury. NETs were excessively formed within liver and in serum of I/R mice models and were testified to be an independent contributor to hepatic I/R injury. Hydroxychloroquine (HCQ) alleviated hepatic I/R injury by inhibiting NETs formation in SCID and c57BL/6 mice models. In vitro, HCQ inhibited neutrophils to form NETs at a concentration of 100 μg/ml. CpG-ODN reversed the effect of HCQ inhibiting NETs formation. HCQ inhibited PAD4 and Rac2 expressions by blocking TLR9. NETs are essential contributors to hepatic I/R injury. HCQ blocking TLR9 protects against hepatic I/R injury by inhibiting NETs formation, which may suggest utility of HCQ or other TLR9 agonists for preventing hepatic I/R injury in clinical practices.
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