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Aim: Angiotensin Ⅱ type 1 receptor (AT1R) blocker losartan ameliorates the rheumatoid arthritis (RA) experimental model adjuvant-induced arthritis (AIA) disease progression.Angiotensin Ⅱ type 2 receptor (AT2R) mainly exerts counterregulatory actions to AT1R still remains obscure in RA.In present study, we investigated the role of AT2R in losartan-induced treatment effects on rats with AIA.