Serotonin-1A receptor function in the dorsal raphe nucleus following chronic administration of the selective serotonin reuptake inhibitor sertraline.

Abstract:

:Serotonin-1A (5-HT(1A) receptors in the dorsal raphe nucleus (DRN) function as somatodendritic autoreceptors, and therefore play a critical role in controlling serotonergic cell firing and serotonergic neurotransmission. We hypothesized that a decrease in the capacity of 5-HT(1A) receptors to activate G proteins was a general mechanism by which 5-HT(1A) receptors in the DRN are desensitized following chronic administration of selective serotonin reuptake inhibitors (SSRIs). Using in vivo microdialysis, we found that the ability of the 5-HT(1A) receptor agonist 8-hydroxydipropylaminotetralin hydrobromide (8-OH-DPAT) (0.025 mg/kg, s.c.) to decrease extracellular 5-HT levels in striatum was attenuated following chronic treatment of rats with the SSRIs sertraline or fluoxetine. This apparent desensitization of somatodendritic 5-HT(1A) autoreceptor function was not accompanied by a decrease in 5-HT(1A) receptor sites in the coupled, high-affinity agonist state as measured by the binding of [3H]8-OH-DPAT. In marked contrast to what was observed following chronic administration of fluoxetine, 5-HT(1A) receptor-stimulated [(35)S]GTPgammaS binding in the DRN was not altered following chronic sertraline treatment. Thus, desensitization of 5-HT(1A) somatodendritic autoreceptor function following chronic sertraline administration appears not to be due to a decrease in the capacity 5-HT(1A) receptors to activate G proteins in the DRN. Our findings suggest that the SSRIs may not be a homogeneous class of antidepressant drug with regard to the mechanism by which the function of somatodendritic 5-HT(1A) autoreceptors is regulated.

journal_name

J Neurochem

authors

Rossi DV,Burke TF,McCasland M,Hensler JG

doi

10.1111/j.1471-4159.2007.05201.x

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

1091-9

issue

4

eissn

0022-3042

issn

1471-4159

pii

JNC5201

journal_volume

105

pub_type

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