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A fluorescence enhancement assay for cellular DNA damage

PM Kanter and HS Schwartz

A fluorescence procedure is described for quantitative measurement of DNA damage in mammalian cells. The technique is based upon the time- dependent partial alkaline unwinding of cellular DNA followed by determination of duplex:total DNA ratios with bisbenzamide, which has a differential molar fluorescence with single-stranded and duplex DNA. The method is rapid, does not require radioactive labeling of DNA, and is sufficiently sensitive to detect damage induced with 100 rads of X- irradiation. This method is standardized with respect to the alkaline unwinding unit, Mn0, and the unwinding constant, beta. Results obtained with this new technique and with hydroxylapatite chromatography for physical separation of single- and double-stranded DNA were confirmatory. The utility of the technique was demonstrated by detection of dose-related damage with X-irradiation and a variety of antineoplastic agents in unlabeled murine leukemia cells.

Volume 22, Issue 1, pp. 145-151, 07/01/1982
Copyright © 1982 by American Society for Pharmacology and Experimental Therapeutics




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