In vivo temporal EPR study using a region-selected intensity determination method to estimate cerebral reducing ability in rats treated with olanzapine |
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Authors: | Hidekatsu Yokoyama Shin-ichi Ishida Tateaki Ogata |
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Institution: | 1. Department of Pharmaceutical Sciences, International University of Health and Welfare, Otawara 324-8501, Japan;2. Yotsukura Hospital, Iwaki 979-0203, Japan;3. Graduate School of Science and Engineering, Yamagata University, Yonezawa 992-8510, Japan |
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Abstract: | Region-selected intensity determination (RSID) is a method for obtaining the temporal changes in electron paramagnetic resonance (EPR) signal intensity from a target region, without the use of complicated procedures employed in the conventional imaging methods. An in vivo 700-MHz radio frequency EPR spectrometer equipped with a bridged loop-gap resonator was used with the RSID method to estimate intracerebral reducing ability in the rat following acute administration of olanzapine (OZP) or haloperidol (HPD). To this end, temporal changes in EPR signal intensity of target regions (the striatum and the prefrontal cortex) of rats which had received a blood-brain-barrier-permeable nitroxide radical (3-hydroxymethyl-2,2,5,5-tetramethylpyrrolidine-1-oxyl) via an intravenous route were observed. The half-lives of EPR signal intensity in both regions of OZP- or HPD-treated rats were significantly longer than in control animals. This indicated that reducing abilities of the striatum and cerebral cortex decreased in the rats to which either OZP or HPD had been acutely administered. |
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Keywords: | Region-selected intensity determination Nitroxide radical Loop-gap resonator Striatum Prefrontal cortex |
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