Use of a monoclonal antibody to detect DNA damage caused by the anticancer drug cis-diamminedichloroplatinum (II) in vivo and in vitro

• Published in: FEBS letters Vol. 354; no. 1; pp. 103 - 109
• Main Authors: Chao, Chuck C.-K., Shieh, Teh-Chien, Huang, Haimei
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 31.10.1994
• Subjects: Antibodies, Monoclonal - immunology; Antibody Specificity; Binding, Competitive; CDRP, cisplatin-damaged DNA recognition protein; Cisplatin; Cisplatin - analysis; Cisplatin - immunology; Cisplatin - metabolism; Cisplatin - pharmacology; cisplatin, cis-diamminedichloroplatinum (II); Damage-recognition protein; DNA Adducts - analysis; DNA Adducts - immunology; DNA Adducts - metabolism; DNA Damage; DNA Repair; ELISA; ELISA, enzyme-linked immunoassay; HeLa Cells; Humans; UV, ultraviolet radiation; Damage-recognition protein; ELISA, enzyme-linked immunoassay; cisplatin, cis-diamminedichloroplatinum (II); DNA repair; CDRP, cisplatin-damaged DNA recognition protein; UV, ultraviolet radiation; Cisplatin; ELISA
• ISSN: 0014-5793; 1873-3468
• DOI: 10.1016/0014-5793(94)01088-9

A monoclonal antibody, MAb62-5, was prepared and used to detect DNA damage due to the anticancer drug cis-diamminedichloroplatinum (II) (or cisplatin). ELISA competition indicated that the binding of MAb62-5 to cisplatin-DNA was competitively inhibited (50% control) by 210 nM of cisplatin bound to DNA, cisplatin/nucleotide (DIN) = 0.2. Using a DNA mobility shift assay, MAb62-5 binding activity was inhibited by 50% by ∼50-fold molar excess of cisplatin-DNA adducts (DIN = 0.08) whereas there was less than 5% inhibition by UV-DNA adducts or mock-treated DNA. In addition, MAb62-5 showed a similar affinity to the cisplatin-DNA adducts as compared to an endogenous cisplatin-damaged DNA recognition protein. Using ELISA with this antibody, we have demonstrated a 2-fold enhancement in excision repair of cisplatin-DNA adducts in resistant HeLa cells. This is supported by the measurement of repair-associated DNA strand breaks using alkaline elution and host cell reactivation of transfected plasmid DNA carrying cisplatin damage. These findings also provide a possible explanation for the complexicity of immunoassay in cells.