Serotonin-transporter mediated efflux: A pharmacological analysis of amphetamines and non-amphetamines

被引：76

作者：

Hilber, B ^{[1
]}

Scholze, P ^{[1
]}

Dorostkar, MM ^{[1
]}

Sandtner, W ^{[1
]}

Holy, M ^{[1
]}

Boehm, S ^{[1
]}

Singer, EA ^{[1
]}

Sitte, HH ^{[1
]}

机构：

[1] Univ Vienna, Inst Pharmacol, A-1090 Vienna, Austria

来源：

NEUROPHARMACOLOGY | 2005年 / 49卷 / 06期

基金：

奥地利科学基金会;

关键词：

carrier-mediated efflux; amphetamine; serotonin; facilitated exchange diffusion model; channel properties;

D O I：

10.1016/j.neuropharm.2005.08.008

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

The physiological function of neurotransmitter transporter proteins like the serotonin transporter (SERT) is reuptake of neurotransmitter that terminates synaptic serotoninergic transmission. SERT can operate in reverse direction and be induced by SERT substrates including 5-HT, tyramine and the positively charged methyl-phenylpyridinium (MPP+), as well as the amphetamine derivatives para-chloroamphetamine (pCA) and methylene-dioxy-methamphetamine (MDMA). These substrates also induce inwardly directed sodium currents that are predominantly carried by sodium ions. Efflux via SERT depends on this sodium flux that is believed to be a prerequisite for outward transport. However, in recent studies, it has been suggested that substrates may be distinct in their properties to induce efflux. Therefore, the aim of the present study was a pharmacological characterization of different SERT substrates in uptake experiments, their abilities to induce transporter-mediated efflux and currents. In conclusion, the rank order of affinities in uptake and electrophysiological experiments correlate well, while the potencies of the amphetamine derivatives for the induction of efflux are clearly higher than those of the other substrates. These discrepancies can be only explained by mechanisms that can be induced by amphetamines. Therefore, based on our pharmacological observations, we conclude that amphetamines distinctly differ from non-amphetamine SERT substrates. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：811 / 819

页数：9

共 39 条

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