title: Correlation between cell killing by cis-diamminedichloroplatinum(II) in six mammalian cell lines and binding of a cis-diamminedichloroplatinum(II)-DNA antiserum.
abstract: The relationship between cell killing and the binding of the anticancer drug cis-diamminedichloroplatinum(II) (cis-DDP) to DNA was studied in six mammalian cell lines. Two of the human cell lines (COV413B) were of the same origin, comprising one sensitive to cis-DDP and the other with induced resistance to the drug. The four other lines, two rodent (RIF-1, Chinese hamster ovary) and two human (A2780, A1847), were unrelated. The cell lines differed in their sensitivity to cis-DDP, as tested in a clonogenic assay. cis-DDP-DNA binding was determined by quantitative immunocytochemistry using an antiserum against cis-DDP-modified DNA. The resistance factors relative to RIF-1, calculated from full survival curves for cis-DDP, were 3.8 +/- 0.4 for Chinese hamster ovary cells and 8.8 +/- 0.7 for both A2780 and A1847 lines. Using quantitative immunocytochemistry, the levels of the adduct-specific nuclear staining density compared with RIF-1 cells were 4.8 +/- 0.2 for Chinese hamster ovary cells, 9.1 +/- 0.2 for A2780, and 10.0 +/- 0.1 for A1847 cells, i.e., in good agreement with the resistance factors. In studies with the COV413B cells and their cis-DDP-resistant counterpart COV413B-PtR, immunologically detected adduct levels again correlated closely with resistance factors (correlation coefficient = 0.97). The kinetics of cis-DDP-DNA adduct formation and loss was investigated in RIF-1, A2780, and A1847 cells by the immunocytochemistry technique. Adduct levels after a 1-h incubation with approximately equitoxic doses of cis-DDP increased by 18 to 32% (average, 27%) between 0 and 6.5 h after treatment and then declined. Adduct half-lives in this latter phase did not correlate with the sensitivities of the cells for cis-DDP. These results indicate that the initial level of cis-DDP-DNA binding measured by quantitative immunocytochemistry may be a reasonable predictor of sensitivity to this chemotherapeutic drug.
authors.affiliation: Division of Chemical Carcinogenesis, The Netherlands Cancer Institute, (Antoni van Leeuwenhoek Huis), Amsterdam.
authors.forename: P M
authors.initials: PM
authors.lastname: Terheggen
authors.forename: J Y
authors.initials: JY
authors.lastname: Emondt
authors.forename: B G
authors.initials: BG
authors.lastname: Floot
authors.forename: R
authors.initials: R
authors.lastname: Dijkman
authors.forename: P I
authors.initials: PI
authors.lastname: Schrier
authors.forename: L
authors.initials: L
authors.lastname: den Engelse
authors.forename: A C
authors.initials: AC
authors.lastname: Begg
mesh_terms: D000818:Animals; D000906:Antibodies; D002470:Cell Survival / Q000187:drug effects; D002945:Cisplatin / Q000276:immunology / Q000378:metabolism* / Q000494:pharmacology; D004260:DNA Repair; D004273:DNA, Neoplasm / Q000187:drug effects / Q000276:immunology / Q000378:metabolism*; D004351:Drug Resistance; D005260:Female; D005354:Fibrosarcoma / Q000188:drug therapy / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D051379:Mice; D010051:Ovarian Neoplasms / Q000188:drug therapy / Q000235:genetics / Q000378:metabolism*; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000378:metabolism
chemical_list: D000906:Antibodies; D004273:DNA, Neoplasm; D002945:Cisplatin