Abstract

ACTINOMYCIN D is a potent inhibitor of RNA synthesis both in vitro and in vivo1,2. Its mode of action involves the intercalation with DNA at G-C regions and prevention of polymerase movement along the template3,4. Actinomycin D has also been shown to inhibit DNA synthesis, cell division and colony formation in mouse L cells5. We have studied the effects of this drug on the DNA of human KB cells in culture. Extensive DNA breakage was induced even at quite low concentrations of the drug.

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