title: Studies of cisplatin and hemoglobin interactions using nanospray mass spectrometry and liquid chromatography with inductively-coupled plasma mass spectrometry.
abstract: Interactions of cisplatin with hemoglobin (Hb) were studied using both nanoelectrospray mass spectrometry (nanoESI-MS) and a combination of size exclusion high performance liquid chromatography with inductively coupled plasma mass spectrometry (HPLC-ICPMS). Size exclusion HPLC separation of free and protein-bound cisplatin followed by simultaneous monitoring of 195Pt and 57Fe demonstrated the presence of Hb-bound Pt complexes. Nanospray quadrupole time-of-flight mass spectrometry studies of the Hb-cisplatin complexes further demonstrated the specific binding of cisplatin to the alpha-chain, heme-alpha, beta-chain, and heme-beta units of hemoglobin. Accurate mass measurements and tandem mass spectrometry information confirmed the Hb-cisplatin complexes. The formation of Hb-cisplatin complexes was observed at the sub-microM to microM concentration levels of cisplatin, which are relevant to clinical levels. These findings and the techniques developed for cisplatin-Hb interaction studies are useful for understanding of drug-protein interactions.
authors.affiliation: Department of Public Health Sciences, Faculty of Medicine and Dentistry, University of Alberta, 10-102 Clinical Sciences Building, Edmonton, Alberta, Canada T6G 2G3.
authors.forename: Rupasri
authors.initials: R
authors.lastname: Mandal
authors.forename: Christine
authors.initials: C
authors.lastname: Teixeira
authors.forename: Xing-Fang
authors.initials: XF
authors.lastname: Li
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002945:Cisplatin / Q000737:chemistry*; D006454:Hemoglobins / Q000737:chemistry*; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods; D036103:Nanotechnology
chemical_list: D000970:Antineoplastic Agents; D006454:Hemoglobins; D002945:Cisplatin