title: Induction and removal of DNA interstrand cross-links in V-79 Chinese hamster cells measured by hydroxylapatite chromatography after treatments with bifunctional furocoumarins.
abstract: DNA interstrand crosslinks (CL) photoinduced by bifunctional furocoumarins in V-79 Chinese hamster cells were measured by alkaline denaturation and hydroxylapatite chromatography. Treatments with 5-methoxypsoralen (5-MOP), 8-methoxypsoralen (8-MOP) and 4,5',8-trimethylpsoralen (4,5',8-TMP) and 365 nm irradiation (UVA) confer a dose-dependent linear increase in the amount of double-stranded DNA indicating the induction of CL. Determination in alkaline sucrose gradients of the molecular weight of the DNA and estimation of drug-induced strand breakage allowed quantification of the CL induced. 5-MOP was found to be slightly more effective than 8-MOP whereas 4,5',8-TMP was 9 times more effective for the induction of CL. The fate of CL during post-treatment incubation was also followed. Cells in exponential growth phase were found to be efficient in the removal of CL.
mesh_terms: D000818:Animals; D002460:Cell Line; D002845:Chromatography; D006224:Cricetinae; D003412:Cricetulus; D004247:DNA / Q000187:drug effects / Q000528:radiation effects; D017886:Durapatite; D011564:Furocoumarins / Q000494:pharmacology*; D006882:Hydroxyapatites; D066298:In Vitro Techniques; D014466:Ultraviolet Rays
chemical_list: D011564:Furocoumarins; D006882:Hydroxyapatites; D004247:DNA; D017886:Durapatite