Objective:To investigate the therapeutic effect of the intervention treatment with different doses of Captopril on TNF-α contents in serum of rheumatoid arthritis(RA) rats,and to provide the theoretical proofs for clinical application of Captopril in treatments ol rheumatoid diseases.Methods:Fifty Wistar rats were randomly divided into 5 groups,namely.Group A,Group 13.Group C.Group D,Group E with 10 rats in each group.Injection of Freund’s complete adjuvant was employed to establish adjuvant-induced arthritis model in rats.Group A was model group;after model establishment,rats were treated with 20 mL normal saline as placebo(ip.).Rats in Group B were treated with 8 mg/kg cyclophosphamide(ip.).Rats in Group C.D and E were intraperitoneally injected with 30 mg/kg.100 mg/kg and 300 mg/kg Captopril respectively.Rats in each group were subjected to continuous treatment for 3 weeks,and then sacrificed.Eyeballs of rats were excised and blood was collected.TNF- α content in serum were detected using ELISA:each group rats were compared for the hind legs arthrocele.Right ankle tissues of rats were collected to prepare section,and microscopic observation of pathological changes was performed.Results:TNF- α content in serum of Group A rats was significantly higher than that of rats in other 4 groups(P<0.05).TNF- α content in serum of Group B rats was significantly lower compared with that of rats in Groups C.D and E.The highest TNF- α content in serum of rats treated with Captopril was found in Group C,followed by Groups D and E(P<0.05).Right ankle arthrocele of rats in Groups B.C.D and E in early stage showed no statistical difference compared with that of Group A rats(P>0.05).From Day 8,ankle arthrocele of rats in Groups B.C.D and E was obviously relieved compared with that of Group A rats:the anti-inflammatory effects were gradually enhanced with the extension of medication time.Treatments of Groups C.D and E showed significant activities against tardive aithrocele:the degree of ankle arthrocele in rats of these three groups was lower than that of Group A rats(P<0.01).Histological observation showed that large amount of inflammatory cells and plasmocyte infiltration was found in ankle synovial tissues of Group A rats.Relief of hyperaemia and edema of right ankle synovial tissues as well as significant decrease in synoviocyte layer hyperplasia,intra—articular inflammatory cells infiltration and cartilage articularis damage degree etc.were observed in Groups B.C.D and E.Conclusions:Intervention treatment with Captopril can effectively reduce the TNF- α content in serum of rheumatoid arthritis rats and inhibit the generation of inflammatory factors,so as to achieve the therapeutic effect. Objective: To investigate the therapeutic effect of the intervention treatment with different doses of Captopril on TNF-α contents in serum of rheumatoid arthritis (RA) rats, and to provide the theoretical proofs for clinical application of Captopril in treatments ol rheumatoid diseases. Methods: Fifty Wistar rats were randomly divided into 5 groups, namely. Group A, Group 13. Group C. Group D, Group E with 10 rats in each group. Injection of Freund’s complete adjuvant was employed to establish adjuvant-induced arthritis model in rats. Rats were Group B was treated with 8 mg / kg cyclophosphamide (ip.). Rats in Group CD and E were intraperitoneally injected with 30 mg / kg.100 mg / kg and 300 mg / kg Captopril respectively. Rats in each group were subjected to continuous treatment for 3 weeks, and then sacrificed. Eyeballs of rats were excised and blood was collected. in serum were detect ed using ELISA: each group rats were compared for the hind legs arthrocele. Light ankle tissues of rats were collected to prepare section, and microscopic observation of pathological changes was performed. Results: TNF-α content in serum of Group A rats was significantly higher TNFα content in serum of Group B rats was significantly lower than with that of rats in Groups CD and E. The highest TNF- α content in serum of rats treated with Captopril was found in Group C, followed by Groups D and E (P <0.05). Light ankle arthrocele of rats in Groups BCD and E in early stage showed no statistical difference compared with that of Group A rats Day 8, ankle arthrocele of rats in Groups BCD and E was significantly relieved compared with that of Group A rats: the anti-inflammatory effects were gradually enhanced with the extension of the medication of .Treatments of Groups CD and E showed significant activities against tardive aithrocele : the degree of ankle arthrocele in rats of these three groups was lower than that of Group A rats (P <0.01). Histological observation showed that large amount of inflammatory cells and plasmocyte infiltration was found in ankle synovial tissues of Group A rats. Relief of hyperaemia and edema of right ankle synovial tissues as well as significant decrease in synoviocyte layer hyperplasia, intra-articular inflammatory cells infiltration and cartilage articularis damage degree etc. were observed in Groups BCD and E. Conclusions: Intervention treatment with Captopril can effectively reduce the TNF- α content in serum of rheumatoid arthritis rats and inhibit the generation of inflammatory factors, so as to achieve the therapeutic effect.