Sibutramine induces potential-dependent exocytotic release but not carrier-mediated release of dopamine and 5-hydroxytryptamine
- 作者：Ukai ; Kiyoharu ; Nakagawa ; Terutake ; Ohyama ; Tadashi ; Nakanishi ; Hiroshi
- 关键词：Sibutramine ; Dosulepin ; Microdialysis ; Dopamine release ; 5-HT (5-hydroxytryptamine ; serotonin) release ; Carrier-mediated
- 刊名：European Journal of Pharmacology
- 出版年：2004
- 期刊代码：24_00142999
- 类别：neu
- 出版时间：January 26, 2004
- 卷：484
- 期：2-3
- 页码：209-215
- 文件大小：437 K
摘要
In order to clarify the mechanism underlying the anti-obesity effects of sibutramine, we examined the effects of sibutramine on extracellular levels of dopamine and 5-hydroxytryptamine (5-HT) through microdialysis in the striatum in unanesthetized and freely moving rats. Sibutramine (5 mg/kg, oral administration (p.o.)) increased extracellular dopamine and 5-HT levels in rat striatum. The tricyclic antidepressant dosulepin (80 mg/kg, p.o. or 1 μM perfusion through the striatal probe) increased 5-HT levels only. Sibutramine-induced dopamine release was antagonized by perfusion of tetrodotoxin (1 μM) through the microdialysis probe in the striatum. However, sibutramine-induced dopamine release was not inhibited by prazosin (1 mg/kg, intraperitoneal injection (i.p.)), a suppressor of serotonergic activity in the striatum via blockade of α1-adrenoceptors, or perfusion with nomifensine (1 μM), an inhibitor of dopamine re-uptake. These results suggest that sibutramine increases dopamine levels in the striatum by exocytotic release and not by a carrier-mediated mechanism.