title: Determination of catecholamines and their 3-O-methyl metabolites in mouse plasma.
abstract: The determination of catecholamines and their 3-O-methyl metabolites in a single mouse plasma is necessary to understand the role of the sympathetic nervous activity, while the inactivation of catecholamines by catechol-O-methyltransferase indicates the activity of blood pressure regulation in animals. Here we report the basal catecholamines and their 3-O-methyl metabolite concentrations obtained from 15 microL of mouse plasma utilizing semi-microcolumn high-performance liquid chromatography (HPLC)-peroxyoxalate chemiluminescence detection system. The concentrations were 6.63 +/- 1.37 pmol/mL plasma, 0.49 +/- 0.10 pmol/mL plasma, 5.25 +/- 2.30 pmol/mL plasma, 3.23 +/- 0.84 pmol/mL plasma, 0.44 +/- 0.11 pmol/mL plasma, and 3.39 +/- 1.67 pmol/mL plasma for norepinephrine, epinephrine, dopamine, normetanephrine, metanephrine and 3-methoxytyramine, respectively (n = 5-7). Further, when blood pressure was reduced by minoxidil, plasma catecholamines were found to be significantly increased by the baroreflex-mediated response in mouse.
authors.affiliation: Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Tsunoda
authors.forename: K
authors.initials: K
authors.lastname: Takezawa
authors.forename: T
authors.initials: T
authors.lastname: Yanagisawa
authors.forename: M
authors.initials: M
authors.lastname: Kato
authors.forename: K
authors.initials: K
authors.lastname: Imai
mesh_terms: D000818:Animals; D001794:Blood Pressure; D002394:Catechol O-Methyltransferase / Q000378:metabolism; D002395:Catecholamines / Q000097:blood*; D002851:Chromatography, High Pressure Liquid; D006339:Heart Rate; D008163:Luminescent Measurements; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL
chemical_list: D002395:Catecholamines; D002394:Catechol O-Methyltransferase