ABSTRACT
AIM: To study the effect of S-methylisothiourea(SMT) on adriamycin(ADM)-induced changes of superoxide dismutase and alutathione peroxidase activities in myocardial tissue of rats.METHODS: Rats were treated with ADM by intraperioneal injection (10.0 mg/kg body weight),and then the ADM-treated rats were intervened by SMT at different dosages by intravenous injection(once a day for three days).The contents of malondialdehyde(MDA) and NO_2~-/ NO_3~-,the activities of manganes superoxied dismutase(MnSOD),copper-zinc superoxide dismutase(Cu-Zn SOD),glutathione peroxidase(GPx) and inducible nitric oxide synthase(iNOS) were determined by spectrophotometry in myocardial tissue.The activity of isoenzymic CK-MB of creatine kinase(CK) was determined by enzymic rate method in serum.The expression of MnSOD mRNA,Cu-ZnSOD mRNA,GPx mRNA and iNOS mRNA were detected by reverse transcription-ploymerase chain reaction.RESULTS: The contents of MDA,NO~-_2/ NO~-_3,and iNOS activity of myocardial tissue,the activity of CK-MB in serum in SMT(5.0,10.0,20.0 mg/kg) intervention groups were significantly lower than those in ADM-treated group(P