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• W1569384070 abstract "Iodinated SCH 23390, 125I-SCH 23982 (DuPont-NEN), was examined using quantitative autoradiography for its potency, selectivity, and anatomical and neuronal localization of binding to the dopamine D1 receptor in rat brain sections. 125I-SCH 23982 bound to D1 sites in the basal ganglia with very high affinity (Kd values of 55-125 pM), specificity (70-85% of binding was displaced by 5 microM cis-flupenthixol), and in a saturable manner (Bmax values of 65-176 fmol/mg protein). Specific 125I-SCH 23982 binding was displaced by the selective D1 antagonists SCH 23390 (IC50 = 90 pM) and cis-flupenthixol (IC50 = 200 pM) and the D1 agonist SKF 38393 (IC50 = 110 nM) but not by D2-selective ligands (I-sulpiride, LY 171555) or the S2 antagonist cinanserin. Compared with 3H-SCH 23390, the 5- to 10-fold greater affinity for the D1 site and 50-fold greater specific radioactivity of 125I-SCH 23982 makes it an excellent radioligand for labeling the D1 receptor. The concentrations of D1 sites were greatest in the medial substantia nigra and exceeded by over 50% the concentration of D1 sites in the lateral substantia nigra, caudoputamen, nucleus accumbens, olfactory tubercle, and entopeduncular nucleus. Lower concentrations of D1 sites were present in the internal capsule, dorsomedial frontal cortex, claustrum, and layer 6 of the neocortex. D1 sites were absent in the ventral tegmental area. Intrastriatal injections of the axon-sparing neurotoxin, quinolinic acid, depleted by 87% and by 46-58% the concentrations of displaceable D1 sites in the ipsilateral caudoputamen and medial and central pars reticulata of the substantia nigra, respectively. No D1 sites were lost in the lateral substantia nigra. Destruction of up to 94% of the mesostriatal dopaminergic projection with 6-hydroxydopamine did not reduce D1 binding nor, with one exception, increase striatal or nigral D1 receptor concentrations. 125I-SCH 23982 selectively labels D1 binding sites on striatonigral neurons with picomolar affinity, and these neurons contain the majority of D1 sites in rat brain." @default.
• W1569384070 created "2016-06-24" @default.
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• W1569384070 date "1987-01-01" @default.
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• W1569384070 title "Picomolar affinity of 125I-SCH 23982 for D1 receptors in brain demonstrated with digital subtraction autoradiography" @default.
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• W1569384070 doi "https://doi.org/10.1523/jneurosci.07-01-00213.1987" @default.
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