title: D-1 dopamine receptor stimulation enables the inhibition of nucleus accumbens neurons by a D-2 receptor agonist.
abstract: Depletion of catecholamines by pretreatment with the tyrosine hydroxylase inhibitor alpha-methyl-para-tyrosine attenuated the ability of the selective D-2 dopamine receptor agonist quinpirole to inhibit rat nucleus accumbens neurons when applied directly by microiontophoresis. Concurrent iontophoretic administration of the D-1 selective agonist SKF 38393, at currents which alone produced little inhibition, reinstated the inhibitory effect of quinpirole. These findings suggest that D-1 receptor stimulation may play a necessary 'enabling' role for D-2 receptor-mediated functional responses.
mesh_terms: D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; D000818:Animals; D001067:Appetite Depressants / Q000494:pharmacology; D001552:Benzazepines / Q000494:pharmacology; D004873:Ergolines / Q000494:pharmacology; D008297:Male; D009474:Neurons / Q000378:metabolism*; D009714:Nucleus Accumbens / Q000187:drug effects / Q000378:metabolism*; D019257:Quinpirole; D051381:Rats; D011919:Rats, Inbred Strains; D011954:Receptors, Dopamine / Q000187:drug effects / Q000378:metabolism*; D012686:Septal Nuclei / Q000378:metabolism*
chemical_list: D001067:Appetite Depressants; D001552:Benzazepines; D004873:Ergolines; D011954:Receptors, Dopamine; D019257:Quinpirole; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine