ENHANCEMENT OF APOMORPHINE-INDUCED ROTATIONAL BEHAVIOUR IN RATS FOLLOWING THE COMBINATION OF 6-HYDROXYDOPAMINE AND ELECTROLYTIC LESIONS IN THE SUBSTANTIA NIGRA
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概要
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Electrolytic lesion in combination with 6-hydroxydopamine (6-OHDA) microinjection was produced in rat substantia nigra (SN) and the animals were observed for drug-induced rotational behaviour. Apornorphine produced rotation toward the left (contralateral) while methamphetamine produced totation toward the right (ipsilateral) in rats with 6-OHDA lesion of the right SN. Both apomorphine and methamphetamine produced rotations ipsilateral to the side of the lesion in rats with unilateral electrolytic lesion of the SN. When the electrolytic lesion was placed in the right SN in an animal that had been treated with 6-OHDA (group 3), apomorphineinduced rotation toward the left was markedly suppressed. Methamphetamine-induced rotation was not affected by this treatment. When the electrolytic lesion was placed in the left SN of rats with 6-OHDA lesion of the right SN (group 4), apomorphineinduced rotation toward the left was significantly enhanced. Methamphetamineinduced rotation obviously decreased. The results in group 3 indicate that electrolytic lesion may induce a dysfunction of postsynaptic factors (i.e. efferent pathways and dopamine receptors) in addition to the degeneration of the nigrostriatal dopaminergic pathway, which may indicate a difference in the direction of apomorphine-induced rotation in groups 1 and 2. The enhancement of rotation produced by apomorphine in group 4 appears to be the result of a dysfunction of the postsynaptic factors in the left SN in combination with the denervation supersensitivity to apomorphine in the right striatum.
- 社団法人 日本薬理学会の論文
著者
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Watanabe Hiroshi
Department of Cardiology, Niigata City General Hospital
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Watanabe Kazuo
Department Of Neurosurgery Southern Tohoku Research Institute For Neuroscience
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Watanabe Kazuo
Department Of Biology Faculty Of Science Osaka University
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Watanabe Hiroshi
Department Of Applied Chemistry And Bioengineering Graduate School Of Engineering Osaka City Univers
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WATANABE Kazuo
Department of Pharmacoinetrics, Research Institute for Wakan-yaku, Toyama University
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