PMID: 2113607Jun 1, 1990Paper

Mitomycin antibiotic reductive potential and related pharmacological activities

Molecular Pharmacology
S S Pan, H Gonzalez

Abstract

Relationships of reductive potential, kinetics of enzymatic reduction, augmented oxygen consumption, and cytotoxicity were determined for seven clinically relevant mitomycin antibiotics. Potentials for one-electron reduction were obtained by cyclic voltammetry analysis in dimethyl sulfoxide with 0.1 M tetraethyl-ammonium perchlorate. These potentials were -0.55 V for N7-acetylmitomycin C, -0.61 V for mitomycin A, -0.75 V for N7-(p-hydroxyphenyl)mitomycin C, -0.79 V for N7-(dimethylamino-methylene)mitomycin C, -0.81 V for N7-(2-(4-nitrophenyldithio)-ethyl)-mitomycin C, -0.81 V for mitomycin C, and -0.89 V for porfiromycin. All seven antibiotics were reduced by xanthine oxidase and NADPH-cytochrome P450 reductase, but the rate of reduction varied for each antibiotic and each enzyme. The less negative the reductive potential of an antibiotic, the more easily that antibiotic was reduced enzymatically. These seven mitomycin antibiotics also augmented oxygen consumption by rat liver microsomes. As with their reduction by xanthine oxidase and NADPH-cytochrome P450 reductase, the less negative the reductive potential of an antibiotic, the more it augmented oxygen consumption. Cytotoxicity of each antibiotic was assessed by defining the...Continue Reading

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