title: Repair of DNA lesions induced by ultraviolet irradiation and aromatic amines in normal and repair-deficient human lymphoblastoid cell lines.
abstract: A host cell reactivation (HCR) assay was employed to study the capacity of a normal and three repair-deficient human lymphoblastoid cell lines to repair DNA damage induced by UV irradiation and the aromatic amines 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and N-acetyl-2-aminofluorene (AAF) respectively. The cell line belonging to xeroderma pigmentosum complementation group C (XP-C) removed all three types of damage less efficiently than the normal cell line, but more efficiently than the cell line belonging to xeroderma pigmentosum complementation group D (XP-D). The cell line belonging to complementation group B of Cockayne's syndrome (CS-B) showed reduced host cell reactivation. Fibroblasts from CS-B patients have reduced gene-specific DNA repair, but normal total genomic DNA repair, thus our data suggest that the HCR assay measures the capacity for gene-specific DNA repair. In the XP-D cell line, which had practically no DNA repair capacity, AAF adducts had a more potent inhibitory effect on gene expression than UV and PhIP adducts. When corrected for this inhibitory effect, the wild-type, XP-C and CS-B cell lines repaired low levels of AAF and UV adducts with similar efficiencies, however, PhIP adducts were repaired less efficiently.
authors.affiliation: Institute of Environmental and Occupational Medicine, University of Aarhus, Denmark.
authors.forename: T
authors.initials: T
authors.lastname: Stevnsner
authors.forename: H
authors.initials: H
authors.lastname: Frandsen
authors.forename: H
authors.initials: H
authors.lastname: Autrup
mesh_terms: D015073:2-Acetylaminofluorene / Q000633:toxicity*; D002273:Carcinogens / Q000633:toxicity*; D002460:Cell Line; D018736:DNA Adducts / Q000378:metabolism; D004260:DNA Repair; D006801:Humans; D007093:Imidazoles / Q000633:toxicity*; D014466:Ultraviolet Rays
chemical_list: D002273:Carcinogens; D018736:DNA Adducts; D007093:Imidazoles; C049584:2-amino-1-methyl-6-phenylimidazo(4,5-b)pyridine; D015073:2-Acetylaminofluorene