title: Characterization of serotonin binding sites on human platelets.
abstract: A high affinity, saturable 3H-spiroperidol binding site was identified for the first time on the intact human platelet, with drug affinities comparable to the serotonin-2 (S-2) receptor in human frontal cortex. The site was characterized by a KD of 2.7 +/- 0.3nM and a Bmax of 1.4 +/- 0.2 pmoles/10(8) platelets. A 3H-serotonin binding site was also found, with a KD of 42 +/- 8 nM, which appeared to represent the serotonin uptake site. No 3H-serotonin binding site with features of the serotonin-1 (S-1) receptor in brain was found on the platelet. Assay of 3H-spiroperidol binding to platelets may serve as an easily applied model for studying S-2 receptor function in man, and its relationship to age, hormonal, drug, and disease effects.
mesh_terms: D000328:Adult; D001667:Binding, Competitive; D001792:Blood Platelets / Q000378:metabolism*; D005625:Frontal Lobe / Q000378:metabolism; D006801:Humans; D007650:Ketanserin; D008297:Male; D010880:Piperidines / Q000378:metabolism; D011985:Receptors, Serotonin / Q000378:metabolism*; D012701:Serotonin / Q000378:metabolism; D012702:Serotonin Antagonists / Q000378:metabolism; D013134:Spiperone / Q000378:metabolism
chemical_list: D010880:Piperidines; D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; D012701:Serotonin; D013134:Spiperone; D007650:Ketanserin