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Background: Activation of inflammatory cells can cause more chemicals induced-hepatotoxicity. Aflatoxin B1 (AFB1) is a fungal toxin that induces acute hepatotoxicity in humans and animals. This study was conducted to examine the effect of co-exposure LPS and various aflatoxin B1 doses on the damage hepatic parameters in isolated perfused rat liver. Methods: Thirty-two male wistar rats (250-300g) were divided to eight groups including Control and LPS; three groups with various doses of AFB1 (0.01, 0.1 and 1 ppm) and three groups with various doses of AFB1 and Lipopolysaccharide (LPS) (300 ppm). Activity of Aspartate transaminase (AST) and Alanine transaminase (ALT) were determined in perfusate. Thiobarbituric acid reactive substances (TBARS) and Glutathione (GSH) concentrations were measured in homogenate liver. Results: At two groups of AFB 1 (with LPS and without LPS) at AFB1 concentrations of 0.1 and 1 ppm, elevation of AST and ALT enzymes activity were indicated. Values of GSH in both of groups (AFB 1 with LPS and without LPS) had reduced at concentration of 1 ppm. TBARS concentrations were enhanced in AFB1 concentration of 1 ppm in both of groups (with LPS and without LPS), however in comparison between groups (with LPS and without LPS) in similar concentrations significant different did not observe (P