Excision repair by human fibroblasts of DNA damaged by r-7, t-8-dihydroxy-t-9,10-OXY-7,8,9,10-tetrahydrobenzo(a)pyrene
Mutation Research/Fundamental and Molecular Mechanisms of MutagenesisPublished 1 June 1978
Rufus S. Day, Dominic A. Scudiero, Michael Dimattina
Citations44
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TL;DR
Normal fibroblasts blocked in semi-conservative DNA synthesis incorporated into their DNA more [3H]thymidine in response to diol-epoxide I treatment than did XP fibro Blasts, and also excised more diol(a)pyrene I from their DNA.
Abstract
Benzo(a)pyrene diol-epoxide I (r-7,t-8,dihydroxy-t-9,10 oxy-7,8,9,10 tetrahydrobenzo(a)pyrene) was used to treat either human adenovirus 5 or cultures of human fibroblasts. The survival of diol-epoxide I treated adenovirus was greater when infecting fibroblasts from normal persons than when infecting fibroblasts from patients with xeroderma pigmentosum (XP). One diol-epoxide I molecule bound per viral genome correlated with one lethal hit as measured using XP fibroblasts. Normal fibroblasts blocked in semi-conservative DNA synthesis incorporated into their DNA more [3H]thymidine in response to diol-epoxide I treatment than did XP fibroblasts, and also excised more diol-epoxide I from their DNA. All of the effects described above were similar to those obtained when the inactivating agent was ultraviolet light rather than benzo(a)pyrene diol-epoxide I.
Keywords
Biochemistry, Genetics and Molecular Biology
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