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Development of a liquid Chromatography-Electrospray ionization tandem mass spectrometry method for detecting Oxaliplatin-DNA intrastrand cross-links in biological samples

Development of a liquid Chromatography-Electrospray ionization tandem mass spectrometry method for detecting Oxaliplatin-DNA intrastrand cross-links in biological samples

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Original languageEnglish
Pages1177-1182
Number of pages6
JournalChemical Research in Toxicology
Journal publication dateAug 2007
Journal number8
Volume20
DOIs
StatePublished

Abstract

Cellular resistance, both intrinsic and acquired, poses a problem in the effectiveness of platinum-based chemotherapy. The cytotoxic activity of Pt-based chemotherapeutic agents is derived from their ability to react with cellular DNA. Oxaliplatin binds to the N7 position of the purine DNA bases, forming mainly intrastrand cross-links between either two adjacent guanines (GG), an adjacent adenine and guanine (AG), or two guanines separated by an unmodified nucleotide (GNG). We report the development of a liquid chromatographyelectrospray ionization tandem mass spectrometry (LCESI-MS/MS) method for measuring GG and AG intrastrand cross-links formed by oxaliplatin. The limits of detection for GGoxPt and AGoxPt were 23 and 19 adducts per 10(8) nucleotides, respectively. We compare the formation and persistence of intrastrand cross-links between wild-type and glutathione transferase P null mice (GSTP null) treated with oxaliplatin. No significant difference was observed in the level of intrastrand cross-links formed by oxaliplatin between the mouse strains in liver, kidney, and lung DNA. Adduct levels were greatest in liver and lowest in lung tissue.

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