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The ability of adriamycin to inhibit Z-DNA formation induced by a high-salt environment was investigated. ADM inhibited this conversion, such that in poly (dG-dC) total inhibition was observed at 1 ADM: 9 base pairs and in eukaryotic DNA (calf thymus) at 1 ADM: 11,5 base pairs. Even at low ADM concentration, 1 ADM: 160 base pairs, some inhibition was observed. At similar ADM:DNA concentrations, an inhibition in DNA synthesis in cells in culture was observed, which showed some parallel with the inhibition of Z-DNA formation. A model is proposed where Z-DNA formation precedes DNA synthesis and where inhibition of the former could explain the antineoplastic nature of adriamycin.
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Paul D. van Helden (1983) studied this question.
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