Regional differences in extracellular dopamine and serotonin assessed by in vivo microdialysis in mice lacking dopamine and/or serotonin transporters

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
Hao-Wei ShenI Sora

Abstract

Cocaine conditioned place preference (CPP) is intact in dopamine transporter (DAT) knockout (KO) mice and enhanced in serotonin transporter (SERT) KO mice. However, cocaine CPP is eliminated in double-KO mice with no DAT and either no or one SERT gene copy. To help determine mechanisms underlying these effects, we now report examination of baselines and drug-induced changes of extracellular dopamine (DAex) and serotonin (5-HT(ex)) levels in microdialysates from nucleus accumbens (NAc), caudate putamen (CPu), and prefrontal cortex (PFc) of wild-type, homozygous DAT- or SERT-KO and heterozygous or homozygous DAT/SERT double-KO mice, which are differentially rewarded by cocaine. Cocaine fails to increase DAex in NAc of DAT-KO mice. By contrast, systemic cocaine enhances DAex in both CPu and PFc of DAT-KO mice though local cocaine fails to affect DAex in CPu. Adding SERT to DAT deletion attenuates the cocaine-induced DAex increases found in CPu, but not those found in PFc. The selective SERT blocker fluoxetine increases DAex in CPu of DAT-KO mice, while cocaine and the selective DAT blocker GBR12909 increase 5-HT(ex) in CPu of SERT-KO mice. These data provide evidence that (a) cocaine increases DAex in PFc independently of DAT and ...Continue Reading

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