Yamanaka N, Kato T, Nishida K, Ota K. Enhancement of DNA chain breakage by bleomycin A2 in the presence of microsomes and reduced nicotinamide adenine dinucleotide phosphate.
Cancer Res 1978;
38:3900-3. [PMID:
81106]
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Abstract
Chain breakage in DNA induced by bleomycin A2 (BLM) was enhanced more than 150-fold by the reduced nicotinamide adenine dinucleotide phosphate-dependent electron transport system of rat liver microsomes. However, the enhancement effect on DNA was partially reduced by the preincubation of BLM with the microsomal systems. BLM-Cu2+ was found to stimulate considerably microsomal reduced nicotinamide adenine dinucleotide phosphate-dependent oxygen consumption and malondialdehyde formation, whereas BLM inhibited both of the effects. These findings suggest that the pharmacological action of BLM is strongly affected by a membrane system, such as microsomes, that produces free radicals.
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