PMID: 3768686Sep 24, 1986Paper

Properties of D2 dopamine receptor autoradiography: high percentage of high-affinity agonist sites and increased nucleotide sensitivity in tissue sections

Brain Research
E K RichfieldJ B Penney

Abstract

[3H]Spiroperidol (spiperone) binding in the presence of mianserin, a serotonin (5-HT2) receptor antagonist, was characterized in rat brain using quantitative autoradiography. All binding parameters were directly determined from film densities. Competition and kinetic studies revealed that [3H]spiroperidol binds to a site having characteristics of the dopamine, D2, receptor in striatum. The general binding parameters were similar to values obtained in homogenate and swabbed section studies except as related to agonist binding and guanine nucleotide sensitivity. Competition studies with dopamine revealed biphasic competition curves with a Kh of 8.23 nM and a Kl of 12.3 microM. The percentage of high-affinity sites was 90%. Guanine nucleotides (1 microM guanylyl-imidodiphosphate) completely converted the high-affinity site to a low-affinity site. Quantitative regional distribution studies revealed high binding in striatum, olfactory tubercle and nucleus accumbens, with lower binding in other dopamine innervated regions including frontal and cingulate cortex. [3H]Spiroperidol was also found to bind to a spirodecanone site with an anatomical localization distinct from the dopamine and serotonin systems and in a region (entorhinal co...Continue Reading

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Citations

Sep 22, 2001·Neuroscience and Biobehavioral Reviews·N M RichtandS M Strakowski
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Apr 12, 2018·ACS Chemical Neuroscience·Sivan SubburajuJohn L Neumeyer

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