title: Regional distribution of high-affinity [3H]somatostatin binding sites in the human brain.
abstract: The distribution of high-affinity binding sites for [3H]somatostatin has been studied in membrane preparations from a number of regions of normal human brain. The highest densities of binding sites (greater than 48 fmol/mg protein) were found in the cerebral and cerebellar cortices and the hippocampus, with intermediate binding densities (30-46 fmol/mg protein) being present in the basal ganglia, amygdala, septum and claustrum. The lowest densities of binding sites (less than 14 fmol/mg protein) were observed in the hypothalamus, thalamus and substantia nigra. The binding of [3H]somatostatin in both the frontal cortex and cerebellar cortex demonstrated pharmacological specificity, since somatostatin-28, but not somatostatin-28(1-12) or Des AA1,2,4,5,12,13, D-Trp8-somatostatin, competed for the binding sites. Scatchard analysis of the binding in both frontal cortex and cerebellar cortex revealed the presence of two classes of high-affinity binding sites.
mesh_terms: D000368:Aged; D000818:Animals; D001665:Binding Sites; D001667:Binding, Competitive; D001921:Brain / Q000378:metabolism*; D002525:Cerebellar Cortex / Q000378:metabolism; D002540:Cerebral Cortex / Q000378:metabolism; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011869:Radioligand Assay; D051381:Rats; D017981:Receptors, Neurotransmitter / Q000378:metabolism*; D017481:Receptors, Somatostatin
chemical_list: D017981:Receptors, Neurotransmitter; D017481:Receptors, Somatostatin