ABC> Vol.4 No.5, August 2014

Spin-Labelled 1-Ethyl-1-Nitrosourea Prevents Doxorubicin and Bleomycin-Induced Oxidative Stress in Lungs, Hearts and Kidneys of Tumour-Bearing Mice

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ABSTRACT

This study was carried out to determine the possible protective effect of 1-ethyl-3-[4-(2, 2, 6, 6-tetramethylpiperidine-1-oxyl)]-1-nitrosourea (SLENU), recently synthesised in our laboratory on doxorubicin and bleomycin-induced oxidative toxicity in C57 black tumour-bearing mice. Specifically, alterations in some biomarkers of oxidative stress, such as lipid peroxidation products measured as malondialdehyde (MDA) levels and activities of the antioxidant enzymes, superoxide dismutase (SOD) and catalase (CAT), were studied in lung, heart and kidney homogenates isolated from C57 black tumor-bearing mice after i.p. treatment with solutions of DOX (60 mg/kg) and BLM (60 mg/kg). The same biomarkers were also measured after i.p. pretreatment of mice with SLENU (100 mg/kg). After treatment with doxorubicin, heart and kidney homogenates of mice had significantly higher productions of lipid peroxidation compared to lung homogenates. It was accompanied by increased activity of the antioxidant defence enzyme superoxide dismutase and decreased activity of catalase. Bleomycin-induced oxidative stress was confirmed by significantly higher production of lipid peroxidation in lungs compared to heart homogenates, elevation of the anti-oxidant activity of superoxide dismutase and decreased activity of catalase enzymes. After pre-treatment of the mice with SLENU, the levels of all studied oxidative stress biomarkers were significantly improved in comparison with those of the mice treated alone with either bleomycin, or doxorubicin. The present results and those from a previously demonstrated superoxide scavenging activities (SSA) of the nitrosourea SLENU have enabled us to explain the protective effect of the spin-labelled nitrosourea on doxorubicin and bleomycin-induced oxidative stress by scavenging of  O2- and increased NO release.

Cite this paper

Gadjeva, V. , Nikolova, G. , Grigorov, B. , Zheleva, A. , Tolekova, A. and Vasileva, M. (2014) Spin-Labelled 1-Ethyl-1-Nitrosourea Prevents Doxorubicin and Bleomycin-Induced Oxidative Stress in Lungs, Hearts and Kidneys of Tumour-Bearing Mice. Advances in Biological Chemistry, 4, 291-300. doi: 10.4236/abc.2014.45035.

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