title: Determination of prodrug treosulfan and its biologically active monoepoxide in rat plasma, liver, lungs, kidneys, muscle, and brain by HPLC-ESI-MS/MS method.
abstract: A prodrug treosulfan (TREO) is currently investigated in clinical trials for conditioning prior to hematopoietic stem cell transplantation. Bioanalysis of TREO and its active derivatives, monoepoxide (S,S-EBDM) and diepoxide, in plasma and urine underlay the pharmacokinetic studies of these compounds but cannot explain an organ pharmacological action or toxicity. Recently, distribution of TREO and S,S-EBDM into brain, cerebrospinal fluid, and aqueous humor of the eye has been investigated in animal models and the obtained results presented clinical relevance. In this paper, a selective and rapid HPLC-ESI-MS/MS method was elaborated and validated for the studies of disposition of TREO and S,S-EBDM in rat plasma, liver, lungs, kidneys, muscle, and brain. The two analytes and codeine, internal standard (IS), were isolated from 50μL of plasma and 100μL of supernatants of the tissues homogenates using ultrafiltration Amicon vials. Chromatographic resolution was accomplished on C18 column with isocratic elution. The limits of quantitation of TREO and S,S-EBDM in the studied matrices ranged from 0.11 to 0.93μM. The HPLC-MS/MS method was adequately precise and accurate within and between runs. The IS-normalized matrix effect differed among the tissues and was the most pronounced in a liver homogenate supernatant (approximately 0.55 for TREO and 0.35 for S,S-EBDM). Stability of the analytes in experimental samples was also established. The validated method for the first time enabled determination of TREO and S,S-EBDM in the six life-important tissues in rats following administration of the prodrug.
authors.affiliation: Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, 6 Święcickiego Street, 60-781 Poznan, Poland. Electronic address: michalroman@ump.edu.pl.
authors.forename: Michał
authors.initials: M
authors.lastname: Romański
authors.affiliation: Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, 6 Święcickiego Street, 60-781 Poznan, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Kasprzyk
authors.affiliation: Department of Forensic Medicine, Poznan University of Medical Sciences, 6 Święcickiego Street, 60-781 Poznan, Poland.
authors.forename: Artur
authors.initials: A
authors.lastname: Teżyk
authors.affiliation: Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, 6 Święcickiego Street, 60-781 Poznan, Poland.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Widerowska
authors.affiliation: Department of Forensic Medicine, Poznan University of Medical Sciences, 6 Święcickiego Street, 60-781 Poznan, Poland.
authors.forename: Czesław
authors.initials: C
authors.lastname: Żaba
authors.affiliation: Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, 6 Święcickiego Street, 60-781 Poznan, Poland.
authors.forename: Franciszek
authors.initials: F
authors.lastname: Główka
mesh_terms: D000818:Animals; D001921:Brain; D002066:Busulfan / Q000031:analogs & derivatives* / Q000737:chemistry / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid; D008099:Liver; D011355:Prodrugs; D051381:Rats; D015203:Reproducibility of Results; D053719:Tandem Mass Spectrometry
chemical_list: D011355:Prodrugs; C018404:treosulfan; D002066:Busulfan
keywords: Animals; Distribution; Hematopoietic stem cell transplantation; Pharmacokinetics; Prodrug; Validation