Abstract
Primary cultures of human hair follicle keratinocytes were established by using a basement membrane-like growth substrate, the bovine eye lens capsule. A method was adapted for the isolation of 3H-benzo(a)pyrene (BP)-modified DNA from the cellular outgrowth of only one hair follicle (approximately 2×105 cells). In a routine procedure hair follicle keratinocytes were incubated with 0.5 μM 3H-BP for 24 h. The purified DNA was subjected to enzymic hydrolysis and the adducts were analyzed by Sephadex LH-20 column chromatography followed by HPLC. Only one major adduct, which represented 60–80% of the total radioactivity which can be confined to modified nucleosides in the LH-20 chromatograph, could be identified. This adduct co-chromatographed with the marker adducts resulting from the trans-addition of the N-2-amino group of guanine to the 10-position of (±)-7β,8α-dihydroxy-9α,10α-epoxy-7,8,9,10-etrahydrobenzo(a)pyrene.
Co-incubation with 7,8-benzoflavone (0.3 μM), an inhibitor of cytochrome P-448, and with 1,1,1-trichloropropene-2,3-oxide (0.2 μM), an inhibitor of epoxide hydrolase, resulted in a marked inhibitory effect (15% of the control binding) and a large increase (300% of the control value) in BP-DNA binding respectively. Induction of aryl hydrocarbon hydroxylase activity in the cultures with 5,6-benzoflavone (10 μM) or benz(a)anthracene (10 μM) caused a decrease (75 and 46% of the control value respectively) in BP-DNA binding. The ratio between “total” binding (as calculated from the specific activity of the isolated DNA) and “true” binding (represented by the BP-nucleoside adducts eluted from the HPLC column) appeared to be rather constant in cultures from four different individuals. Therefore, total binding may serve as a good representative of true binding. Using cultures from hair follicles of eight different persons, interindividual variation was 4-fold, with a mean binding of 2.4×109 molecules/μg DNA. Since it has been demonstrated that the formation of dihydrodiols of BP — among them the proximate carcinogen 7,8-dihydrodiol-BP — in freshly isolated hair follicles is largely genetically determined (Hukkelhoven et al. 1982), the interindividual differences in binding may possibly reflect individual variation in susceptibility to BP-induced neoplasia.
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This investigation was supported by the Netherlands Cancer Society (Koningin Wilhelmina Fonds)
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Hukkelhoven, M.W.A.C., Bronkhorst, A.M. & Vermorken, A.J.M. Covalent binding of BP-metabolites to DNA of cultured human hair follicle keratinocytes. Arch Toxicol 57, 6–12 (1985). https://doi.org/10.1007/BF00286567
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DOI: https://doi.org/10.1007/BF00286567