Dopamine D2 receptor-dependent modulation of striatal NO synthase activity.

Dopamine D2 receptor-dependent modulation of striatal NO synthase activity. Research Abstract Details 

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Dopamine D2 receptor-dependent modulation of striatal NO synthase activity. Abstract Text:

Stephen Sammut,Kristina E Bray,Anthony R West,

RATIONALE: Striatal nitric oxide (NO)-producing interneurons receive synaptic contacts from midbrain dopamine (DA) neurons and are regulated by phasic DA transmission. Classic antipsychotic drugs elevate neuronal NO synthase (NOS) expression in the rat striatum. Given that NO signaling potently modulates the membrane excitability of striatal projection neurons, it is plausible that up-regulation of NOS activity after DA D2 receptor blockade contributes to the therapeutic efficacy and/or motor side effects associated with antipsychotic drugs. OBJECTIVES: This study assessed the impact of DA D(2) receptor activation on striatal NOS activity in vivo. Characterization of the dopaminergic regulation of striatal NO signaling will be relevant for understanding the mechanism(s) of action of antipsychotic drugs. MATERIALS AND METHODS: Striatal NO efflux, evoked via electrical stimulation of the substantia nigra (SN) or systemic administration of the DA D(1) receptor agonist SKF 81297, was assessed in anesthetized rats using an NO-selective amperometric microsensor. RESULTS: The facilitatory effect of SN stimulation on striatal NO efflux was attenuated by systemic administration of the DA D(2) receptor agonist quinpirole. Conversely, administration of the DA D(2) receptor antagonist eticlopride augmented evoked NO efflux. NO efflux induced by systemic administration of SKF 81297 was attenuated by quinpirole and restored by co-administration of quinpirole and eticlopride. The facilitatory effect of SKF 81297 on NO efflux was also significantly attenuated after pretreatment with the non-specific NOS inhibitor methylene blue. CONCLUSIONS: Activation of NO synthesis by phasic DA transmission is down-regulated via a DA D2 receptor-dependent mechanism. DA D(2) receptor activation opposes DA D(1) receptor activation of NO synthesis at a site postsynaptic to the DA terminal. Further studies examining NO-DA dynamics may have potential to reveal novel therapeutic strategies to treat various brain disorders.

Dopamine D2 receptor-dependent modulation of striatal NO synthase activity. Publishing Authors By Initials

S Sammut,KE Bray,AR West,

For similar natural sciences: time: time factors research abstracts see: natural sciences: time: time factors research

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MEDLINE DATE:

Dopamine D2 receptor-dependent modulation of striatal NO synthase activity. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Psychopharmacology

VOLUME: 191

Page Numbers: 793-803

Journal Abbreviation: Psychopharmacology (Berl.)

ISSN: 0033-3158

DAY: 6

MONTH: 01

YEAR: 2007

Dopamine D2 receptor-dependent modulation of striatal NO synthase activity. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 7608025

Dopamine D2 receptor-dependent modulation of striatal NO synthase activity. Keywords Mesh Terms:

KEYWORDS: Time Factors

MESH TERMS: metabolism

Chemical & Substance for Abstract: Dopamine D2 receptor-dependent modulation of striatal NO synthase activity. Information

Substance Name: Nos1 protein, rat

Registry Number: EC 1.14.13.39

Grant and Affiliation Information for Dopamine D2 receptor-dependent modulation of striatal NO synthase activity.

AFFILIATION: Department of Neuroscience, The Chicago Medical School at Rosalind Franklin University of Medicine and Science, 3333 Green Bay Road, North Chicago, IL, 60064, USA.

Country: Germany

AGENCY: United States NINDS

GRANT: NS 047452

ACRONYM: NS

MEDLINETA: Psychopharmacology (Berl)

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