期刊
SYNAPSE
卷 48, 期 4, 页码 170-177出版社
WILEY
DOI: 10.1002/syn.10200
关键词
fluoxetine; antidepressant; Ca2+ channel; glutamate release; cerebrocortical; synaptosomes
Fluoxetine, an antidepressant that is used clinically in the treatment of mood disorders, is a selective serotonin reuptake inhibitor. In the present study we investigated the effects of fluoxetine on 4-aminopyridine (4AP)-evoked glutamate release in cerebrocortical nerve terminals (synaptosomes). Fluoxetine suppressed the release of glutamate evoked by 4AP in a concentration-dependent manner. This effect was associated with a reduction in the depolarization-evoked increase in cytosolic free calcium levels in the absence of significant effect on the synaptosomal membrane potential. In addition, both ionomycin- and sucrose-evoked glutamate releases were not affected by fluoxetine, indicating that fluoxetine-mediated inhibition of glutamate release is not a direct effect on the exocytotic machinery. Furthermore, the inhibitory action of fluoxetine was completely abolished in synaptosomes pretreated with P/Q type Ca2+ channel blocker omega-agatoxin IVA (omega-AgTX IVA) or protein kinase C (PKC) stimulator 4beta-phorbol 12, 13-dibutyrate (PDBu). These results suggest that, in cerebrocortical nerve terminals, fluoxetine inhibits glutamate release through the suppression of P/Q type Ca2+ channel activity. The presynaptic action of fluoxetine is mediated by a PKC-sensitive signaling pathway.
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