title: Specific inhibition of dopamine D-1-mediated cyclic AMP formation by dopamine D-2, muscarinic cholinergic, and opiate receptor stimulation in rat striatal slices.
abstract: The ability of different receptors to mediate inhibition of cyclic AMP accumulation due to a variety of agonists was examined in rat striatal slices. In the presence of 1 mM 3-isobutyl-1-methylxanthine, dopamine D-2, muscarinic cholinergic, and opiate receptor stimulation by RU 24926, carbachol, and morphine (all at 10(-8)-10(-5) M), respectively, inhibited the increase in cyclic AMP accumulation in slices of rat striatum due to dopamine D-1 receptor stimulation by 1 microM SKF 38393. In contrast, these inhibitory agents were unable to reduce the ability of a number of other agonists, including isoprenaline, prostaglandin E1, 2-chloroadenosine, vasoactive intestinal polypeptide, and cholera toxin, to increase cyclic AMP levels in striatal slices. These results suggest that in rat striatum either dopamine D-2, muscarinic cholinergic, and opiate receptors are only functionally linked to dopamine D-1 receptors or that the D-1 and D-2 receptors linked to adenylate cyclase lie on the cells, distinct from other receptors capable of elevating striatal cyclic AMP levels.
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; D015762:2-Chloroadenosine; D000241:Adenosine / Q000031:analogs & derivatives / Q000494:pharmacology; D000527:Alprostadil / Q000494:pharmacology; D000818:Animals; D001552:Benzazepines / Q000494:pharmacology; D002217:Carbachol / Q000494:pharmacology; D002772:Cholera Toxin / Q000494:pharmacology; D003342:Corpus Striatum / Q000378:metabolism*; D000242:Cyclic AMP / Q000096:biosynthesis*; D007545:Isoproterenol / Q000494:pharmacology; D009020:Morphine / Q000494:pharmacology; D010627:Phenethylamines / Q000494:pharmacology; D051381:Rats; D011950:Receptors, Cholinergic / Q000378:metabolism*; D011954:Receptors, Dopamine / Q000378:metabolism*; D011976:Receptors, Muscarinic / Q000378:metabolism*; D011957:Receptors, Opioid / Q000378:metabolism*; D014660:Vasoactive Intestinal Peptide / Q000494:pharmacology
chemical_list: D001552:Benzazepines; D010627:Phenethylamines; D011950:Receptors, Cholinergic; D011954:Receptors, Dopamine; D011976:Receptors, Muscarinic; D011957:Receptors, Opioid; D015762:2-Chloroadenosine; D014660:Vasoactive Intestinal Peptide; C025254:RU 24926; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; D009020:Morphine; D002217:Carbachol; D002772:Cholera Toxin; D000242:Cyclic AMP; D000527:Alprostadil; D000241:Adenosine; D007545:Isoproterenol; D015056:1-Methyl-3-isobutylxanthine