title: On the complexity and dynamics of in vivo Cisplatin-DNA adduct formation using HPLC/ICP-MS.
abstract: In this work we present a methodology to measure the complex adduct spectrum caused by the interaction of Cisplatin with DNA. By using an optimized DNA digestion procedure we were able to show that the adduct spectrum in in vivo duplex DNA is much more complex than described so far. For the first time a high abundance of interstrand adducts has been detected by using HPLC/ESI-MS. These adducts could play a key role in the DNA repair mechanisms and the development of cellular resistance to Cisplatin. By species-unspecific isotope dilution analysis HPLC/ICP-MS measurements, we were able to study the kinetics of adduct formation. With these experiments we proved that after the initial formation of adducts a rearrangement occurs on the DNA-strands leading to significant changes in adduct patterns over time. Furthermore, the parameters of the species-unspecific isotope dilution analysis were optimized to allow measurements of specific adducts in the DNA of Cisplatin exposed cells.
authors.affiliation: Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Ziehe
authors.forename: Diego
authors.initials: D
authors.lastname: Esteban-Fernández
authors.forename: Ulrike
authors.initials: U
authors.lastname: Hochkirch
authors.forename: Jürgen
authors.initials: J
authors.lastname: Thomale
authors.forename: Michael W
authors.initials: MW
authors.lastname: Linscheid
mesh_terms: D000818:Animals; D002417:Cattle; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002945:Cisplatin / Q000032:analysis / Q000737:chemistry*; D004247:DNA / Q000737:chemistry; D018736:DNA Adducts / Q000032:analysis / Q000096:biosynthesis / Q000737:chemistry*; D008099:Liver / Q000737:chemistry / Q000378:metabolism; D008297:Male; D013058:Mass Spectrometry / Q000379:methods*; D051379:Mice; D008810:Mice, Inbred C57BL
chemical_list: D018736:DNA Adducts; C057270:cisplatin-DNA adduct; D004247:DNA; C427203:calf thymus DNA; D002945:Cisplatin