Differential regulation of serotonin-1A receptor-stimulated [35S]GTPγS binding in the dorsal raphe nucleus by citalopram and escitalopram

被引:12
|
作者
Rossi, Dania V. [1 ]
Burke, Teresa F. [1 ]
Hensler, Julie G. [1 ]
机构
[1] Univ Texas Hlth Sci Ctr San Antonio, Dept Pharmacol, San Antonio, TX 78229 USA
关键词
quantitative autoradiography; serotonin-1A; citalopram; escitalopram; S-35]GTP gamma S binding; H-3]8-OH-DPAT;
D O I
10.1016/j.ejphar.2008.01.022
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
The effect of chronic citalopram or escitalopram administration on 5-HT1A receptor function in the dorsal raphe nucleus was determined by measuring [S-35]GTP gamma S binding stimulated by the 5-HT1A receptor agonist (R)-(+)-8-0H-DPAT (InM-10 mu M). Although chronic administration of citalopram or escitalopram has been shown to desensitize somatodendritic 5-HT1A autoreceptors, we found that escitalopram treatment decreased the efficacy of 5-HT1A receptors to activate G proteins, whereas citalopram treatment did not. The binding of [H-3]8-OH-DPAT to the coupled, high affinity agonist state of the receptor was not altered by either treatment. Interestingly, escitalopram administration resulted in greater occupancy of serotonin transporter sites as measured by the inhibition of [H-3]cyanoimipramine binding. As the binding and action of escitalopram is limited by the inactive enantiomer R-citalopram present in racemic citalopram, we propose that the regulation of 5-HT1A receptor function in the dorsal raphe nucleus at the level of receptor-G protein interaction may be a result of greater inhibition of the serotonin transporter by escitalopram. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:103 / 107
页数:5
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