Abstract:
:Autoradiographic analysis of [(35)S]GTPgammaS binding was used to investigate functional activation of dopamine receptors in rat striatum. Dopamine-stimulated [(35)S]GTPgammaS binding was observed with a maximal increase of 38% over basal activity. A similar stimulatory response was obtained with the D(2) agonist quinpirole, but not SKF-238393, a D(1) agonist. The effect of dopamine was blocked by the D(2) antagonist raclopride, but was unaffected by SCH-23990, a D(1) antagonist. There appeared to be a differential distribution of dopamine-stimulated [(35)S]GTPgammaS binding, with the lowest activity obtained in the medial portion of the caudal striatum. These results demonstrate, using an autoradiographic approach, (i) that dopamine stimulated [(35)S]GTPgammaS binding in the rat striatum occurs through activation of D(2) receptors, and (ii) that the effects of dopamine activation vary in different areas of the rat striatum.
journal_name
Brain Resjournal_title
Brain researchauthors
He L,Di Monte DA,Langston JW,Quik Mdoi
10.1016/s0006-8993(00)02981-4subject
Has Abstractpub_date
2000-12-01 00:00:00pages
133-6issue
1eissn
0006-8993issn
1872-6240pii
S0006-8993(00)02981-4journal_volume
885pub_type
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