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Regulatory effects of D2 receptors in the ventral tegmental area on the mesocorticolimbic dopaminergic pathway.

Abstract：

:To investigate the regulatory effects of somatodendritic D2 receptors on the terminal's extracellular dopamine (DA) concentration, a D2 antagonist (eticlopride) was infused directly into the ventral tegmental area via a microdialysis probe in chloral hydrate-anesthetized rats. Extracellular DA changes in both the nucleus accumbens (N ACC) and the medial prefrontal cortex (mPFC) were monitored. Infusion of 10.0 fM eticlopride had no effect on DA in the mPFC (110.2 +/- 10.0% of baseline) but significantly increased DA in the N ACC (150.1 +/- 11.7%). Infusion of a higher dose of eticlopride (100.0 or 1,000.0 fM) significantly augmented the DA in the mPFC (121.1 +/- 7.6 and 180.7 +/- 25.8%, respectively) but surprisingly had no effect on DA in the N ACC (111.5 +/- 7.3 and 104.1 +/- 8.7%, respectively). To further investigate whether the bluntness of DA increase in the N ACC was due to DA receptor activation in the mPFC, eticlopride or SCH23390 was infused into the mPFC prior to and during intrategmental eticlopride infusion, and the change of DA in the N ACC was simultaneously monitored. During intra-mPFC 1.0 nM eticlopride infusion but not during 10.0 nM SCH23390 administration (95.5 +/- 6.1%), intrategmental 1,000.0 fM eticlopride infusion could further elevate DA in the N ACC (130.0 +/- 4.6%). Our results indicated that (1) the mesolimbic and the mesocortical pathways were under tonic inhibition by somatodendritic D2 receptors; (2) the DA concentration in the N ACC first increased and then returned to baseline while the intrategmental infusion dose of eticlopride increased; and (3) the bluntness of DA increase in the N ACC resulted from the D2 receptor activation in the mPFC.

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Chen NN,Pan WH

doi

10.1046/j.1471-4159.2000.0742576.x

keywords:

subject

Has Abstract

pub_date

2000-06-01 00:00:00

pages

2576-82

issue

6

eissn

0022-3042

issn

1471-4159

journal_volume

74

pub_type

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