Abstract
High-affinity [ 3H]serotonin (5-hydroxytryptamine, 5-HT) binding sites from human frontal cortex can be divided into at least 3 pharmacological subtypes (5-HT 1A, 5-HT 1B and 5-HT 3) based on affinity for [ 3H]serotonin and spiperone. All 3 sites are solubilized by 3% Triton X-100, 1% Tween-80 and can be enriched by serotonin-linked-Sepharose 4B affinity chromatography. However, 5-HT 3 sites are more sensitive to heat inactivation, long-term storage, and sulfhydrylalkylation. The pharmacological profiles are distinct for the spiperone-insensitive 5-HT 1B and 5-HT 3 sites in both human and bovine cortex. In addition, evidence is presented for the existence of a novel, low concentration [ 3H]serotonin binding site in human cortex.
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