Exaggerated effect of fluvoxamine in heterozygote serotonin transporter knockout mice.

Abstract:

:Clearance rates for serotonin (5-HT) in heterozygote (+/-) and homozygote (-/-) serotonin transporter (5-HTT) knockout (KO) mice have not been determined in vivo. Moreover, the effect of selective serotonin reuptake inhibitors (SSRIs) on 5-HT clearance in these mice has not been examined. In this study, the rate of clearance of exogenously applied 5-HT was measured in the CA3 region of the hippocampus of anesthetized mice using high-speed chronoamperometry. Compared with wild-type mice, the maximal rate of 5-HT clearance from extracellular fluid (ECF) was decreased in heterozygotes and more markedly so in KO mice. Heterozygote mice were more sensitive to the 5-HT uptake inhibitor, fluvoxamine, resulting in longer clearance times for 5-HT than in wild-type mice; as expected, the KO mice were completely unresponsive to fluvoxamine. There were no associated changes in norepinephrine transporter density, nor was there an effect of the norepinephrine uptake inhibitor, desipramine, on 5-HT clearance in any genotype. Thus, adaptive changes in the norepinephrine transport system do not occur in the CA3 region of hippocampus as a consequence of 5-HTT KO. These data highlight the potential of the heterozygote 5-HTT mutant mice to model the dynamic in vivo consequences of the human 5-HTT polymorphism.

journal_name

J Neurochem

authors

Montañez S,Owens WA,Gould GG,Murphy DL,Daws LC

doi

10.1046/j.1471-4159.2003.01836.x

keywords:

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

210-9

issue

1

eissn

0022-3042

issn

1471-4159

pii

1836

journal_volume

86

pub_type

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