title: Structural relationships in the inhibition of [3H]tryptamine binding to rat brain membranes in vitro by phenylalkylamines.
abstract: The ability of various phenylalkylamines to inhibit the binding of [3H]tryptamine to rat frontal/parietal cortical membranes was examined in vitro. Affinity for [3H]tryptamine binding sites improved as the alkyl side chain was extended to include four carbons or when a methoxy group was added at the para position of the ring. One compound, p-methoxyphenylpropylamine (IC50 = 3.6 nM), was as potent as unlabelled tryptamine as a displacing agent. Based on the unique structure-activity relationship obtained, it appears that [3H]tryptamine binding sites do not mediate the actions of phenethylamines on serotonin uptake or release.
mesh_terms: D000478:Alkylation; D000814:Aniline Compounds / Q000494:pharmacology*; D000818:Animals; D001921:Brain / Q000378:metabolism*; D066298:In Vitro Techniques; D008297:Male; D011869:Radioligand Assay; D051381:Rats; D011919:Rats, Inbred Strains; D011985:Receptors, Serotonin / Q000187:drug effects* / Q000378:metabolism; D013329:Structure-Activity Relationship; D014363:Tryptamines / Q000378:metabolism*
chemical_list: D000814:Aniline Compounds; D011985:Receptors, Serotonin; D014363:Tryptamines; C030820:tryptamine