Pharmacological study of TA-0910, a new thyrotropin-releasing hormone(TRH) analog(III): Inhibition of pentobarbital anesthesia.
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概要
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Sites and mechanisms of the antagonistic action of TA-0910, a new thyrotropin-releasing hormone (TRH) analog, on pentobarbital anesthesia were studied in rats. Intravenous administration of TA-0910 dose-dependently shortened the duration of pentobarbital anesthesia at 30 μg/kg or more. The anti-anesthetic action of TA-0910 after intracerebral injection was in the following order of effectiveness: the posterior lateral hypothalamic area > midbrain reticular formation > raphe nuclei = locus ceruleus > anterior lateral hypothalamic area = ventral globus pallidus = hippocampus. TA-0910 injected into the nucleus accumbens, medial septal nucleus, parietal cortex or striatum had no effect, even at high doses. The anti-anesthetic action of TA-0910 (0.1mg/kg, i.v.) was inhibited by a low dose of scopolamine or mecamylamine and by a high dose of haloperidol, phenoxybenzamine or metergoline. However, physostigmine and oxotremorine showed no anti-anesthetic action alone or in combination with TA-0910 (0.01mg/kg, i.v.). Pentobarbital anesthesia was not inhibited by carbachol injected into various sites of the brain. These results suggest that the inhibitory effect of TA-0910 on pentobarbital anesthesia is mainly produced by activation of the posterior lateral hypothalamic area and the midbrain reticular formation, and that the involvements of not only acetylcholine but also other neurotransmitters such as dopamine, serotonin, and noradrenaline should be examined for their anti-anesthetic action.
- 公益社団法人 日本薬理学会の論文
著者
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Nakagawa Hiroyuki
Department Of Applied Chemistry School Of Science And Engineering Waseda University
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Kinoshita Kiyoshi
Department of Pharmacology, Kyoritsu College of Pharmacy
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YAMAMURA Michio
Department of Pharmacology, Safety Research Laboratory, Tanabe Seiyaku
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Yamamura Michio
Department of Pharmacology, Safety Research Laboratory, Tanabe Seiyaku Co., Ltd.
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Kinoshita Kiyoshi
Department of Pharmacology, Safety Research Laboratory, Tanabe Seiyaku Co., Ltd.
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