Abstract

The effect of daunomycin, chromomycin A/sub 3/, anthramycin, cis-dichlorodiammineplatinum(II) (cisplatin), mitomycin C, and chloroquine on the frequency of radioninduced strand breaks in X-irradiated aqueous solutions of DNA was studied primarily by analytical ultracentrifugation using the sedimentation velocity method. The results show a potent radiosensitizing effect for daunomycin and chromomycin, a protective action for chloroquine and mitomycin, and a nonmodifying effect for anthramycin. Cisplatin forms a highly aggregated complex with DNA which prevents this kind of study.

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