Résumé
Objective To research the therapeutic effect of dihydroarteminsinin/piperaquine phosphate(duo-cotecxin)on rats with Pneumocystis pneumonia(PCP),and explain its potential mechanism.Methods The PCP rat model was established through the subcutaneous injection with cortisone acetate twice a week for 6 weeks.The model rats were orally treated with duo-cotecxin at a dose of 40 mg/kg once a day for 3 days,and with cotecxin at a dose of 60 mg/kg once a day for 6 days,respectively.The therapy control group was treated orally with SMZco(sulfamethoxazol 250 mg/kg +Trimethoprim 50 mg/kg),positive control group and normal group were established,respectively.The drug efficacy was based on rat survival rate,increase rate of body weight,lung weight/body weight ratio,mean numbers of the cysts per field in the lung print smear,and the changes of CD4+ T cells,CD8+ T cells,NO,IFN-? and TNF-? in the blood.Results The survival rates and the body weight of rats treated with duo-cotecxin and cotecxin were higher and heavier than those of the positive control group respectively,which approached to those of the group treated with SMZco.The lung weight/body weight ratio,and mean cyst number per field of lung print smear of the rats treated with duo-cotecxin and cotecxin were lower than those of the positive control group,respectively.NO and TNF-? in the blood of the rats treated with duo-cotecxin and cotecxin were lower than those of the positive control group,respectively(P