Add time:09/24/2019 Source:sciencedirect.com
Benzyl chloride (BC) and 4-Chloromethylbiphenyl (cas 1667-11-4) (4CMB) induce a class of alkaline-stable DNA damage in human cells which, like UV-induced pyrimidine dimers, undergoes repair at a slow rate by an excision-repair pathway which can be inhibited by cytosine arabinoside (araC). In the present study, in an attempt to clarify whether BC and 4CMB are UV-like agents, the excision-deficient xeroderma pigmentosum complementation group A fibroblasts and excision-proficient human alveolar tumour cells (A549) were exposed to various doses of these compounds prior to monitoring the inhibition of cell growth, DNA damage and DNA repair. The data indicate that such XP fibroblasts repair BC- and 4CMB-induced DNA damage at a normal rate, which suggests that the alkaline-stable DNA adducts induced by these chloromethyl compounds and the UV-induced pyrimidine dimers are processed by distinct excision-repair mechanisms in human cells.
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