期刊
NEUROSCIENCE
卷 124, 期 3, 页码 647-653出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuroscience.2003.12.023
关键词
cerebellum; nicotinic acetylcholine receptors; alpha-bungarotoxin; mecamylamine; dihydro-beta-erythroidine
This is a neurochemical study which shows that nicotine acting through alpha7-containing nicotinic acetylcholine receptors promotes the release of [H-3]-glutamate from rat cerebellar slices. Release evoked by half maximal concentration of nicotine (100 muM) was blocked by alpha-bungarotoxin and in a calcium-free medium, suggesting an effect mediated by an alpha7 receptor. Dihydro-beta-erythroidine and mecamylamine were effective only at very high concentrations, excluding the participation of heteromeric receptors. The effect of nicotine was partially blocked by inhibitors of glutamatergic receptors DL-2-amino-5-phosphonovaleric acid and 6-cyano-7-nitroquinoxaline-2,3-dione, indicating a glutamate-induced glutamate release. Nicotine-evoked response was dependent on activation of tetrodotoxin sensitive sodium channels. Therefore, here we show that glutamate released by stimulation of alpha7-containing nicotinic receptors, located preterminal and/or postsynaptically, evokes a further glutamate release in adult rat cerebellar slices. (C) 2004 Published by Elsevier Ltd on behalf of IBRO.
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