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Cannabinoid receptor 2 (CB2R) is highly expressed in immune cells and plays an important role in regulating immune responses.In the current study,we investigated the effects of GW405833 (GW),a specific CB2R agonist,on acute liver injury induced by concanavalin A (Con A).In animal experiments,acute liver injury was induced in mice by injection of Con A (20 mg/kg,i.v.).The mice were treated with GW (20 mg/kg,i.p.,30 min after Con A injection) or GW plus the selective CB2R antagonist AM630 (2 mg/kg,i.p.,15 min after Con A injection).We found that Con A caused severe acute liver injury evidenced by significantly increased serum aminotransferase levels,massive hepatocyte apoptosis,and necrosis,as well as lymphocyte infiltration in liver tissues.Treatment with GW significantly ameliorated Con A-induced pathological injury in liver tissue,decreased serum aminotransferase levels,and decreased hepatocyte apoptosis.The therapeutic effects of GW were prevented by AM630.In cell experiments,we showed that CB2Rs were highly expressed in Jurkat T cells,but little expression in L02 liver cells.Treatment with GW (10-40 μg/mL) dose-dependently decreased the viability of Jurkat T cells and induced cell apoptosis,which was reversed by AM630.In the coculture of Jurkat T cells with L02 liver cells,GW dose-dependently protected L02 cells from apoptosis induced by Con A (5 pg/mL).The protective effect of GW was reversed by AM630 (1 μg/mL).Our results suggest that GW protects against Con A-induced acute liver injury in mice by inhibiting Jurkat T-cell proliferation through the CB2Rs.