Effects of stress, non-stress cyclicity on hypothalamic noradrenaline release in rats.
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概要
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The effects of continuous stress and intermittent stress at short intervals on rat hypothalamic noradrenaline (NA) release were assessed by measuring the levels of a principal metabolite of NA, 3-methoxy-4-hydroxy-phenylethyleneglycol sulfate (MHPG-SO<SUB>4</SUB>) in male Wistar rats. The rats were exposed to one of five restraint stress conditions, unstressed (control), six 15 min intermittent stress periods (interspersed with 18 min non-stress periods), three 30 min intermittent stress periods (interspersed with 45 min non-stress periods), 90 min continuous stress period or 180 min continuous stress period. The 15 min intermittently stressed rats had significantly larger increases in hypothalamic MHPG-SO<SUB>4</SUB> than the single 90 min and 180 min continuously stressed rats, while the 30 min intermittently stressed rats were significantly different from only the 180 min continuously stressed rats. In a comparison of the 15 min and 30 min intermittently stressed rats, which had the same total duration of stress exposure; the 15 min group had larger increases in MHPG-SO<SUB>4</SUB> levels than the 30 min group. This study provides supporting evidence for the role of stress cyclicity in determining the extent of stress-induced NA release from the hypothalamus.
- 久留米大学医学部 The Kurume Medical Journal 編集部の論文
著者
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Tsuda Akira
Department Of Clinical And Laboratory Medicine Akita University School Of Medicine
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Shimizu Tomomi
Department Of Biochemistry School Of Pharmaceutical Sciences Kyushu University Of Health And Welfare
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Tanaka Masatoshi
Department Of Comprehensive Management Matsumoto University
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GONDOH YUHJI
Department of Internal Medicine, Kurume University School of Medicine
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YOKOO HIDEYASU
Department of Neuropsychiatry, Kurume University School of Medicine
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MIZOGUCHI KATSUHIRO
Department of Pharmacology, Kurume University School of Medicine
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MIZOGUCHI KATSUHIRO
Department of Internal Medicine, Kurume University School of Medicine
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SHIMIZU TOMOMI
Department of Pharmacology, Kurume University School of Medicine
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MATSUGUCHI NAOSHIGE
Department of Pharmacology, Kurume University School of Medicine
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