title: Reducing ability of the striatum and cerebral cortex in rats following acute administration of risperidone or haloperidol: an estimation by in vivo electron paramagnetic resonance imaging.
abstract: In vivo temporal electron paramagnetic resonance (EPR) imaging of the blood-brain barrier-permeable nitroxide radical, 3-methoxycarbonyl-2,2,5,5-tetramethylpyrrolidin-1-yloxy (PCAM), in the brain of rats was conducted following acute administration of risperidone (RSP) or haloperidol (HPD). The half-life of the signal intensity of PCAM was obtained from a selected area in the temporal EPR images. The half-lives in the striatum and cerebral cortex for the RSP- or HPD-treated rats were significantly longer than for the control rats (p < 0.01). This finding indicates that the reducing abilities of the striatum and cerebral cortex decreased in the rats to which either RSP or HPD had been acutely administrated because the half-life of PCAM in the selected region of the brain reflects its reducing ability.
authors.affiliation: Institute for Life Support Technology, Yamagata, Japan. yokohidea@fmu.ac.jp
authors.forename: Hidekatsu
authors.initials: H
authors.lastname: Yokoyama
authors.forename: Osamu
authors.initials: O
authors.lastname: Itoh
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Ohya-Nishiguchi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kamada
mesh_terms: D000818:Animals; D014150:Antipsychotic Agents / Q000008:administration & dosage / Q000494:pharmacology; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism*; D003342:Corpus Striatum / Q000187:drug effects / Q000378:metabolism*; D003497:Cyclic N-Oxides; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D006207:Half-Life; D006220:Haloperidol / Q000008:administration & dosage / Q000494:pharmacology*; D007091:Image Processing, Computer-Assisted; D008297:Male; D010084:Oxidation-Reduction; D011759:Pyrrolidines / Q000493:pharmacokinetics; D051381:Rats; D017208:Rats, Wistar; D018967:Risperidone / Q000008:administration & dosage / Q000494:pharmacology*
chemical_list: D014150:Antipsychotic Agents; D003497:Cyclic N-Oxides; C109806:MCPROXYL; D011759:Pyrrolidines; D006220:Haloperidol; D018967:Risperidone