title: Characterization and quantification of Bcl-2 antisense G3139 and metabolites in plasma and urine by ion-pair reversed phase HPLC coupled with electrospray ion-trap mass spectrometry.
abstract: A novel ion-pair reversed phase electrospray ionization (IP-RP-ESI) liquid chromatography-mass spectrometry (LC-MS) method has been developed for identification and quantification of Bcl-2 antisense phosphorothioate oligonucleotides G3139 and metabolites in plasma. This method utilized solid phase extraction for desalting and matrix removal and detection by an ion trap mass spectrometer. Resolution was accomplished on a micro C18 column eluted with a mobile phase consisting of hexafluoro-2-propanol and triethylamine in methanol at 50 degrees C. Five G3139 metabolites were identified in plasma and urine from treated patients and rats. A cassette HPLC-MS/MS quantification method for G3139 and three metabolites was developed and validated with a limit of quantification (LOQ) of 17.6 nM in human and rat plasma with acceptable precision and accuracy. Plasma pharmacokinetics of G3139 and metabolites in these species were described.
authors.affiliation: Division of Pharmaceutics, College of Pharmacy, Room no. 308, The Ohio State University, Comprehensive Cancer Center (OSU CCC), 410 W12th Ave., Columbus, OH 43210, USA.
authors.forename: Guowei
authors.initials: G
authors.lastname: Dai
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Wei
authors.forename: Zhongfa
authors.initials: Z
authors.lastname: Liu
authors.forename: Shujun
authors.initials: S
authors.lastname: Liu
authors.forename: Guido
authors.initials: G
authors.lastname: Marcucci
authors.forename: Kenneth K
authors.initials: KK
authors.lastname: Chan
mesh_terms: D000818:Animals; D001483:Base Sequence; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D007477:Ions; D016376:Oligonucleotides, Antisense / Q000097:blood* / Q000652:urine*; D051381:Rats; D017207:Rats, Sprague-Dawley; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013873:Thionucleotides / Q000097:blood* / Q000493:pharmacokinetics / Q000652:urine*
chemical_list: D007477:Ions; D016376:Oligonucleotides, Antisense; D013873:Thionucleotides; C408162:oblimersen