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Selective modifications in the nucleus accumbens of dopamine synaptic transmission in rats exposed to chronic stress

Scheggi, Simona and Leggio, Benedetta and Masi, Flavio and Grappi, Silvia and Gambarana, Carla and Nanni, Giulio and Rauggi, Riccardo and De Montis, Maria Graziella (2002) Selective modifications in the nucleus accumbens of dopamine synaptic transmission in rats exposed to chronic stress. Journal of Neurochemistry, Vol. 83 (4), p. 895-903. eISSN 1471-4159. Article.

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DOI: 10.1046/j.1471-4159.2002.01193.x

Abstract

Stressful events are accompanied by modifications in dopaminergic transmission in distinct brain regions. As the activity of the neuronal dopamine (DA) transporter (DAT) is considered to be a critical mechanism for determining the extent of DA receptor activation, we investigated whether a 3-week exposure to unavoidable stress, which produces a reduction in DA output in the nucleus accumbens shell (NAcS) and medial prefrontal cortex (mPFC), would affect DAT density and DA D1 receptor complex activity in the NAcS, mPFC and caudate-putamen (CPu). Rats exposed to unavoidable stress showed a decreased DA output in the NAcS accompanied by a decrease in the number of DAT binding sites, and an increase in the number of DA D1 binding sites and Vmax of SKF 38393 -stimulated adenylyl cyclase. In the mPFC, stress exposure produced a decrease in DA output with no modification in DAT binding or in DA D1 receptor complex activity. Moreover, in the CPu stress exposure induced no changes in DA output or in the other neurochemical variables examined. This study shows that exposure to a chronic unavoidable stress that produces a decrease in DA output in frontomesolimbic areas induced several adaptive neurochemical modifications selectively in the nucleus accumbens.

Item Type:Article
ID Code:1352
Status:Published
Refereed:Yes
Uncontrolled Keywords:Chronic stress, dopamine transporter, microdialysis, nucleus accumbens
Subjects:Area 05 - Scienze biologiche > BIO/14 Farmacologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze del farmaco
Publisher:Blackwell / Wiley
eISSN:1471-4159
Copyright Holders:© 2002 International Society for Neurochemistry
Additional Information:Pubblicato online il 4 novembre 2002.
Deposited On:18 Aug 2009 10:04

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