title: Formation and removal of benzo(a)pyrene adducts of DNA in hamster tracheal epithelial cells.
abstract: A cloned cell line derived from normal hamster tracheal epithelium has been characterized with respect to its response to the environmental pollutant and carcinogen benzo(a)pyrene [B(a)P]. These cells metabolize B(a)P to ultimate reactive forms as assayed by alkylation of DNA. Alkylation with radiotracer amounts of B(a)P was maximum at 8 hr, at which time 70% of the applied hydrocarbon had been converted to water-soluble forms. At longer incubation times, the rate of removal of adducts exceeded the rate of formation. When B(a)P-containing medium was replaced with fresh medium at two or four hr, a subsequent biphasic removal of adducts occurred, a rapid removal for the first four hr postincubation and then a slower repair. About 50% of the DNA-bound hydrocarbon remained in DNA after 48 hr. Cells were able to divide in the presence of these lesions, undergoing five doublings (five days), while only 60% of the adducts were removed from the DNA. Integrity of DNA during this period was monitored by the alkaline elution technique. A toxic dose of B(a)P was required to cause any increase in the rate of elution. Minimal single-strand breakage was observed from two to eight hr of B(a)P treatment, but at 15 hr DNA appeared normal. Comparison was made with a nontoxic dose of methyl methanesulfonate which caused very rapid elution of DNA after only one hr treatment. At least 15 deoxyribonucleoside-bound B(a)P adducts were separated by high-pressure liquid chromatography. Four adducts, probably deoxyadenosine-B(a)P, were removed almost completely in 24 hr, while the others appeared to be poorly removed. The possible significance to neoplasia of persistent and repairable lesions is discussed.
mesh_terms: D000818:Animals; D001564:Benzo(a)pyrene; D001580:Benzopyrenes / Q000378:metabolism* / Q000633:toxicity; D002455:Cell Division; D002851:Chromatography, High Pressure Liquid; D002999:Clone Cells; D006224:Cricetinae; D004247:DNA / Q000378:metabolism*; D003839:Deoxyadenosines / Q000032:analysis; D003853:Deoxyribonucleosides / Q000032:analysis; D008741:Methyl Methanesulfonate / Q000494:pharmacology; D013997:Time Factors; D014132:Trachea
chemical_list: D001580:Benzopyrenes; D003839:Deoxyadenosines; D003853:Deoxyribonucleosides; D001564:Benzo(a)pyrene; D004247:DNA; D008741:Methyl Methanesulfonate