Background: Doxorubicin (DOX) is highly effective antineoplastic agent, but it has side effects including cardiotoxicity.Moringa oleifera and vitamin E are potent antioxidants that prevent cardiotoxicity. Objective: evaluate the possible protective role of moringa oleifera and vitamin E on doxorubicin-induced cardiotoxicity. Materials and Methods: Sixty-five adult male albino rats were randomly divided into five groups. Group I (control group). Group II (affected group): rats were injected intraperitoneally with a cumulative dose of 15 mg/ kg of DOX for three weeks. Group III (moringa group): given in a dose of (500 mg/ kg/ day) by gastric tube orally for four weeks. Group IV (vitamin E group): given in a dose of (100 mg/ kg/ day) by gastric tube orally for four weeks. Group V (moringa and vitamin E).Heart specimens were taken and prepared for histological, immunohistochemical and EM examination. Results: Group II showed disorganized, widely separated muscle fibers, cytoplasmic vacuolation, pyknosis of many cardiomyocyte nuclei, the mitochondria appeared distorted, extravasation of RBCs and inflammatory infiltrations. There was significant increase (P <0.01) in collagen fibers deposition and iNOS immunostaining compared with control group. Groups III and IV showed improvement of some histological microscopic changes, significant decrease (P <0.01) in collagen fibers deposition and iNOS immunostaining compared with group II. While group V showed histological architecture near to control group. Conclusion: each of moringa olifera and vitamin E can ameliorate induced cardiotoxicity, but their co-administration can give better results.
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