Objective:To investigate the protective effect of FK866 on acute liver injury(ALI)induced by acetaminophen(APAP)and its mechanism. Methods:Twenty-four male C57 BL/6 mice(6-week-old)were randomly divided into the control group,FK866 group,APAP group and FK866 +APAP group. The activities of alanine aminotransferase(ALT) and aspartate aminotransferase(AST) in serum were determined by colorimetric method,the pathological changes of liver by HE(hematoxylin eosin)staining,the levels of tumor necrosis factor-α(TNF...