title: Automated method to estimate catecholamine and indoleamine content and turnover rates.
abstract: A double-label isotopic method for estimation of the rate of formation of serotonin (5-HT) and dopamine (DA) in mouse striatum, hippocampus and cortex was standardized. Mice received an intravenous pulse injection of [3H]tryptophan (TRP) and [3H]tyrosine (TYR) at 2.5, 5, 10 or 20 min before sacrifice by microwave irradiation. Compounds of interest were separated by automated high-performance liquid chromatography and their contents were determined by electrochemical detection. Programmed collection of the TYR, DA, 5-HT and TRP peaks allowed determination of their radioactivity by liquid scintillation. Conversion of [3H]TYR to [3H]DA was nearly ten times greater in striatum than cortex, whereas the formation of [3H]5-HT from [3H]TRP was similar in striatum, cortex and hippocampus.
mesh_terms: D000818:Animals; D001322:Autoanalysis; D001711:Biotransformation; D001921:Brain / Q000378:metabolism*; D002540:Cerebral Cortex / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D003342:Corpus Striatum / Q000378:metabolism; D004298:Dopamine / Q000096:biosynthesis / Q000378:metabolism*; D006624:Hippocampus / Q000378:metabolism; D007700:Kinetics; D008297:Male; D051379:Mice; D012701:Serotonin / Q000096:biosynthesis / Q000378:metabolism*; D014364:Tryptophan / Q000378:metabolism; D014443:Tyrosine / Q000378:metabolism
chemical_list: D012701:Serotonin; D014443:Tyrosine; D014364:Tryptophan; D004298:Dopamine