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Inhibition of poly(ADP-Rib) by benzamide (BA) or 3-amino-benzamide (3AB) for a limited period (i.e., when ADP-ribosylation is elevated) during and shortly following X-ray or MNNG-induced DNA damage of BALB/3T3 cells significantly (3- to 30-fold) enhanced transformation frequency by these agents. Individual Type III foci isolated from benzamide, X-ray, or X-ray plus benzamide treated cultures were established and characterized for growth in soft agar and for tumor induction in nude mice. DNA isolated from representative transformed lines established as a result of BA, X-ray or X-ray and BA treatments was transfected onto NIH/3T3 cells. Transformation efficiencies ranging from 0.17 to 0.28 foci/micrograms of DNA were observed suggesting the possibility that dominant transforming gene(s) were responsible for the oncogenic phenotype of radiation and benzamide transformed DNA.
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Kasid et al. (1986) studied this question.
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