Abstract：
:The functional regulation by dopamine (DA) receptors of serotonin (5-HT) release from the rat substantia nigra (SN) was investigated using in vivo microdialysis. A D1- and D2-receptor-mediated inhibition of nigral 5-HT release was demonstrated in this study. Continuous administration of the D1-receptor agonist CY 208243 (10 microM) through the probe did not alter extracellular DA nor 5-HT from the SN, whereas intranigral administration of the D1-receptor antagonist SCH-23390 HCl (10 microM) significantly increased both DA (to 214%) and 5-HT release (to 168%) from the SN. Co-perfusion of the D1-receptor agonist and antagonist did not change nigral DA nor 5-HT release compared to perfusion of the antagonist alone. The continuous intranigral perfusion of the D2-receptor agonist, (-)-quinpirole HCl (1 microM) significantly decreased both DA ad 5-HT release to 71% and 78%, respectively. These decreases were abolished when the D2-receptor antagonist S(-)-sulpiride (10 microM) and the D2-receptor agonist (-)-quinpirole HCl (1 microM) were co-perfused. In contrast, the intranigral perfusion of the DA precursor, L-DOPA (5 microM; 1 h), significantly increased nigral and striatal 5-HT release to 202% and 155%, respectively. This enhanced nigral 5-HT release might not be receptor-mediated. The results of the present study suggest a D1 and D2 regulation of nigral 5-HT release, either directly mediated by DA receptors on nigral 5-HT terminals or indirectly by nigral GABA, Glu or Asp. Alternatively, the observed DA-5HT-interaction in the SN might not reflect a local interaction but might involve an interaction at the level of the serotonin cell body region, the dorsal raphe nuclei (DRN).
journal_name
Brain Resjournal_title
Brain researchauthors
Thorré K,Sarre S,Smolders I,Ebinger G,Michotte Ydoi
10.1016/s0006-8993(98)00336-9subject
Has Abstractpub_date
1998-06-15 00:00:00pages
107-16issue
1-2eissn
0006-8993issn
1872-6240pii
S0006-8993(98)00336-9journal_volume
796pub_type
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