title: Aging process affects a single class of dopamine receptors.
abstract: [3H]Spiroperidol and [3H](-)-sulpiride specific binding have been used to assay for D1 and D2 dopaminergic recognition sites in striatal membranes of aged rats. While [3H]spiroperidol binding shows a decreased number of binding sites, no changes have been detected in [3H](-)-sulpiride binding, which is a marker for D2 dopaminergic receptors. Data obtained with GTP and DA-dependent adenylyl cyclase activity confirm the hypothesis that aging selectively affects in rats those dopaminergic receptors coupled to the formation of cyclic AMP (D1).
mesh_terms: D015102:3,4-Dihydroxyphenylacetic Acid / Q000378:metabolism; D000262:Adenylyl Cyclases / Q000378:metabolism; D000375:Aging; D000818:Animals; D003342:Corpus Striatum / Q000187:drug effects / Q000201:enzymology; D006220:Haloperidol / Q000494:pharmacology; D006801:Humans; D008297:Male; D011954:Receptors, Dopamine / Q000187:drug effects / Q000378:metabolism*; D013134:Spiperone / Q000378:metabolism; D013469:Sulpiride / Q000378:metabolism
chemical_list: D011954:Receptors, Dopamine; D015102:3,4-Dihydroxyphenylacetic Acid; D013134:Spiperone; D013469:Sulpiride; D000262:Adenylyl Cyclases; D006220:Haloperidol