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Human PBL were treated in vitro with the ultimate reactive metabolites of BaP anti- and syn-BaPDE and DNA damage and repair were measured. The incorporation of radioactivity into DNA due to UDS was higher after treatment with anti-BaPDE. Radioactive DNA adduct dosimetry applied to PBL treated with tritiated syn- and anti-BaPDE demonstrated that anti-BaPDE gave more DNA adducts, which were more efficiently removed than syn adducts in the 24 h following the treatment. HPLC analysis of deoxynucleosides obtained from the enzymatic digestion of DNA showed that in treated PBL the major DNA adduct involved deoxyguanosine. DNA strand breaks, detected by FADU, were induced at comparable levels by anti- and syn-BaPDE (0.1-0.4 micrograms/ml), and persisted after 20 h of post-treatment incubation. Only in the case of syn-BaPDE did the percentage of double-stranded DNA tend to increase with time after the treatment.
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