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Involvement of dopamine D2 receptors in apomorphine-induced facilitation of forebrain serotonin output.

Abstract：

:The effect of systemic administration of the nonselective dopamine receptor agonist apomorphine on efflux of serotonin (5-hydroxytryptamine, 5-HT) in striatum and hippocampus of freely moving rats was examined using in vivo microdialysis. 5-HT efflux was increased by a moderate dose of apomorphine sufficient for a postsynaptic dopaminergic effect (0.5 mg/kg, s.c.), but not by a lower dose (0.1 mg/kg, s.c.), that acts preferentially on presynaptic dopamine receptors. This effect was blocked by a dopamine D2 receptor antagonist raclopride, administered either systemically or locally into striatum, but not by a 5-HT1A receptor antagonist N-¿2-[4-(2-methoxyphenyl)-1-piperazinyl]ethyl¿-N-(2-pyridinyl) cyclohexanecarboxamide 3HCI (WAY-100635). This indicates that dopamine D2 receptors, and not 5-HT1A receptors, mediate the facilitatory effect of apomorphine, and that this effect occurs at the nerve terminal level. Behavioral effects of apomorphine outlasted the concomitant changes in 5-HT efflux, suggesting that these changes resulted from dopaminergic receptor activation, rather than from the drug-induced behavioral arousal.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Mendlin A,Martín FJ,Jacobs BL

doi

10.1016/s0014-2999(98)00321-5

subject

Has Abstract

pub_date

1998-06-26 00:00:00

pages

291-8

issue

3

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(98)00321-5

journal_volume

351

pub_type

杂志文章

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