title: D2 dopamine receptors in the rat prefrontal cortex: characterization and alteration by stress.
abstract: D2 dopamine (DA) receptors were characterized in the medial prefrontal cortex (MPFC) of the rat by employing radioligand binding techniques which greatly reduced [3H]spiperone binding to filters, S2 serotonin receptors and spirodecanone sites. Competition studies suggested that the MPFC contains a higher proportion of D2 [high] receptors than does the striatum. The IC50 values of DA receptor antagonists in assays of MPFC tissue were correlated with their antipsychotic potencies. Stress (footshock or tailshock) increased the density of MPFC D2 dopamine receptors and decreased their affinity for [3H]spiperone. These changes were delayed in onset, being present at 27 h but not at 3 h after exposure to stress. The binding assay detected the changes when it was performed at pH 7.9 but not when the pH was reduced to 6.2. D2 dopamine receptors in the striatum and nucleus accumbens were not affected by stress.
authors.affiliation: Department of Psychiatry, University of British Columbia, Vancouver, Canada.
authors.forename: A J
authors.initials: AJ
authors.lastname: MacLennan
authors.forename: M A
authors.initials: MA
authors.lastname: Pelleymounter
authors.forename: S
authors.initials: S
authors.lastname: Atmadja
authors.forename: A
authors.initials: A
authors.lastname: Jakubovic
authors.forename: S F
authors.initials: SF
authors.lastname: Maier
authors.forename: H C
authors.initials: HC
authors.lastname: Fibiger
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D002540:Cerebral Cortex / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D011954:Receptors, Dopamine / Q000378:metabolism*; D017448:Receptors, Dopamine D2; D012016:Reference Values; D013134:Spiperone / Q000378:metabolism; D013315:Stress, Psychological / Q000378:metabolism*
chemical_list: D011954:Receptors, Dopamine; D017448:Receptors, Dopamine D2; D013134:Spiperone