Microdialysis approach to study serotonin outflow in mice following selective serotonin reuptake inhibitors and substance P (neurokinin 1) receptor antagonist administration: a review.

Abstract:

:Classical antidepressant drugs such as Selective Serotonin Reuptake Inhibitors (SSRIs) display several disadvantages, e.g., the onset of action (2 to 3 weeks) to start clinical benefits is too long, and a significant proportion of patients do not respond to this monotherapy. Several strategies have been proposed to overcome these problems, notably the use of potentiating agents, which combined with SSRIs, augment or accelerate their established antidepressant activity. Recent clinical trials proposed that compounds with dual action on both central serotonin (5-HT) and noradrenaline (NA) systems would have a faster action than SSRIs alone. Preclinical electrophysiological and neurochemical studies demonstrated that the putative new class of antidepressants, substance P (neurokinin 1) NK1 receptor antagonists, enhance brain monoaminergic neurotransmissions by reducing the sensitivity of 5-HT1A autoreceptors in the Dorsal Raphe Nucleus, and possibly alpha2 autoreceptors in the Locus Coeruleus. However, in several clinical studies, a similar delay of therapeutic effects has been reported with NK1 receptor antagonists and SSRIs. Recently intracerebral in vivo microdialysis studies were performed to examine the effects of genetic or pharmacological blockade of Substance P (SP)/ NK1 neurotransmission on SSRIs-induced increases in extracellular 5-HT levels in awake, freely moving mice. New evidences suggest that the combination of a NK1 receptor antagonist with a SSRI should benefit to depressed patients. This review describes our current knowledge of the role of SP and its preferred NK1 receptors mainly in the modulation of brain serotonergic activity.

journal_name

Curr Drug Targets

journal_title

Current drug targets

authors

Guiard BP,Lanfumey L,Gardier AM

doi

10.2174/138945006775515428

keywords:

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

187-201

issue

2

eissn

1389-4501

issn

1873-5592

journal_volume

7

pub_type

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