title: Isolation and characterization of metabolites of centpropazine in rat liver, intestine, and red blood cell homogenates.
abstract: The potential sites for metabolism of centpropazine (CPZ) (an antidepressant) were evaluated in male Sprague-Dawley rats. The isolation and identification of the major metabolites formed in the presence of rat liver S9 fraction, intestine, and red blood cells under aerobic conditions were performed using high-performance liquid chromatography and electrospray ionization mass spectrometry. CPZ was found to be extensively metabolized to seven possible metabolites by liver S9 fraction in the presence of a nicotinamide adenine dinucleotide phosphate generating system at 37 degrees C. Both intestinal wall and red blood cells were also found to metabolize the compound. This metabolite structure was confirmed by comparison with that of its synthetic standard. The drug was stable in intestinal contents. On the basis of our finding, we propose the in vitro metabolic pathways for CPZ.
authors.affiliation: Department of Pharmacokinetics and Metabolism, Central Drug Research Institute, Lucknow-226 001, Uttar Pradesh, India.
authors.forename: Bhattaram V
authors.initials: BV
authors.lastname: Atul
authors.forename: Shio K
authors.initials: SK
authors.lastname: Singh
authors.forename: K P
authors.initials: KP
authors.lastname: Madhusudanan
authors.forename: Jyoti K
authors.initials: JK
authors.lastname: Paliwal
authors.forename: Ram C
authors.initials: RC
authors.lastname: Gupta
mesh_terms: D000818:Animals; D000928:Antidepressive Agents / Q000302:isolation & purification* / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D004355:Drug Stability; D004912:Erythrocytes / Q000737:chemistry* / Q000378:metabolism; D007413:Intestinal Mucosa / Q000378:metabolism; D007422:Intestines / Q000737:chemistry*; D008099:Liver / Q000737:chemistry* / Q000378:metabolism; D008297:Male; D010879:Piperazines; D051381:Rats; D017207:Rats, Sprague-Dawley; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D000928:Antidepressive Agents; D010879:Piperazines; C044266:centpropazine