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Photo-induced formation of DNA adducts of 2,2',4,4',5,5'-hexachlorobiphenyl in cultured human cells.

Biochem. Pharmacol. 38, 2773-2779 (1989)
DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Association of the PCB congener 2,2',4,4',5,5'-hexachlorobiphenyl (6-CB) with cell nuclei has been studied in cultured monolayer human Chang liver cells. Photo-induced formation of covalent bonds determined 6-CB binding to protein of cell nuclei and to DNA. Nuclear binding of 6-CB approached equilibrium after approximately 30 min of incubation. Photo-induced binding in vitro to purified Chang liver cell DNA substantiated direct interaction of the PCB congener with DNA. In monolayer cells, low levels of photo-induced 6-CB DNA adducts could be detected using the very sensitive 32P-postlabeling method. Adduct formation was dependent on 6-CB concentration as well as on incubation time. Highest adduct levels were in the range of 2 X 10(-8). Model reactions in vitro showed photo-induced binding of 6-CB to individual purine deoxyribonucleotide-3'-phosphates. The results demonstrate rapid intracellular movement of the PCB congener into the cell nucleus. The vast majority is associated with nuclear protein, minute amounts of 6-CB are found proximate to the DNA helix as evidenced by photo-induced adducts of purine nucleotides.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
ISSN (print) / ISBN 0006-2952
e-ISSN 0006-2952
Quellenangaben Band: 38, Heft: , Seiten: 2773-2779 Artikelnummer: , Supplement: ,
Verlag Elsevier
Begutachtungsstatus Peer reviewed