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1 - Presynaptic adaptive responses to constitutive versus adult pharmacologic inhibition of serotonin uptake

Published online by Cambridge University Press:  06 July 2010

By
Beth A. Luellen ,
Tracy L. Gilman  and
Anne Milasincic Andrews
Edited by
Allan V. Kalueff  and
Justin L. LaPorte
Allan V. Kalueff
Affiliation:
Georgetown University Medical Center
Justin L. LaPorte
Affiliation:
National Institute of Mental Health
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Summary

ABSTRACT

Many antidepressants are believed to relieve depressed mood and excessive anxiety by inhibiting the reuptake of serotonin so as to cause increases in extracellular serotonin. This homeostatic alteration is thought to underlie further adaptive processes – which have not been fully clarified – that together constitute the cellular mechanisms of current antidepressant therapy. Here, we review the literature on presynaptic adaptive responses to chronic antidepressant treatment, focusing on alterations in serotonin transporter (SERT) expression, extracellular and intracellular serotonin levels, and serotonergic innervation. We contrast this with studies on constitutive loss of SERT gene expression. A partial genetic reduction in SERT expression results in modest increases in extracellular serotonin, while the total absence of SERT is associated with substantial increases in extracellular serotonin, decreases in intracellular serotonin, and a reduction in serotonin immunopositive cell bodies and axons in the dorsal raphe and hippocampus, respectively. Adaptive changes in SERT protein levels and extracellular and intracellular serotonin concentrations following many different regimens of chronic antidepressant administration were found to be more variable, often falling in between those resulting from partial and complete genetic ablation of SERT. This might reflect incomplete pharmacologic inhibition of SERT and the wide variety of drug administration paradigms utilized. The microdialysis literature, in particular, suggests that it is difficult to conclude that chronic antidepressant treatment reliably causes elevated extracellular serotonin.

Type
Chapter
Information
Experimental Models in Serotonin Transporter Research , pp. 1 - 42
Publisher: Cambridge University Press
Print publication year: 2010

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