Loss of rat striatal dopamine receptors with ageing is selective for D-2 but not D-1 sites: association with increased non-specific binding of the D-1 ligand [3H]piflutixol.
The effects of age on the binding of dopaminergic ligands to rat striatal membranes were studied. When compared with four month old animals, at 22 months there was a significant decrease in the density of specific binding sites for the D-2 ligand [3H]spiperone while their affinity was unaltered. However, the specific binding of [3H]piflutixol to D-1 sites was unaltered between these age groups. The non-specific binding of [3H]piflutixol was significantly increased in aged preparations. Age-related loss of striatal D-2 dopamine receptors does not extend to the D-1 type. Alterations in non-specific [3H]piflutixol binding may reflect other pathophysiological changes associated with senescence.
D000262:Adenylyl Cyclases / Q000378:metabolism; D000375:Aging; D000818:Animals; D014150:Antipsychotic Agents / Q000378:metabolism*; D003342:Corpus Striatum / Q000378:metabolism*; D066298:In Vitro Techniques; D007700:Kinetics; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D011954:Receptors, Dopamine / Q000378:metabolism*; D017447:Receptors, Dopamine D1; D017448:Receptors, Dopamine D2; D013134:Spiperone / Q000378:metabolism; D013892:Thioxanthenes / Q000378:metabolism*
D014150:Antipsychotic Agents; D011954:Receptors, Dopamine; D017447:Receptors, Dopamine D1; D017448:Receptors, Dopamine D2; D013892:Thioxanthenes; D013134:Spiperone; D000262:Adenylyl Cyclases; C015448:piflutixol