Studies on the interaction of bleomycin A2with rat lung microsomes. III. Effect of exogenous iron on bleomycin-mediated DNA chain breakage

  • Trush M
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The interaction of bleomycin A2with rat lung microsomes results in bleomycin-mediated DNA chain breakage due to the mixed-function oxidase catalyzed activation of bleomycin. This study demonstrates that the addition of exogenous Fe3+significantly enhances the bleomycin-mediated cleavage of DNA deoxyribose, that the enhancing effect of Fe3+is maximum when a 1:1 ratio of bleomycin to Fe3+is achieved and that either NADPH or NADH can serve as pyridine cofactors for this reaction. Since the activation of bleomycin can be facilitated by iron in the Fe2+form, these observations support the hypothesis that the mixed-function oxidase system may serve to maintain either adventitious or exogenous iron in the Fe2+form. In the absence of DNA, the interaction of bleomycin with rat lung microsomes results in the self-inactivation of bleomycin, a reaction which is also enhanced by the addition of exogenous Fe3+. Thus, the microsomal mixed-function oxidase system represents an efficient biological system for the 'activation-inactivation' of bleomycin. © 1983.

Author-supplied keywords

  • Bleomycin - DNA deoxyribose cleavage - Lung microsomes

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  • Michael A. Trush

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