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Pubmed ID :7680751
Publication Date : //

Cloning and expression of a novel serotonin receptor with high affinity for tricyclic psychotropic drugs.


We have used the polymerase chain reaction technique to selectively amplify a guanine nucleotide-binding protein-coupled receptor cDNA sequence from rat striatal mRNA that exhibits high homology to previously cloned serotonin receptors. Sequencing of a full length clone isolated from a rat striatal cDNA library revealed an open reading frame of 1311 base pairs, encoding a 437-residue protein with seven hydrophobic regions. Within these hydrophobic regions, this receptor was found to be 41-36% identical to the following serotonin [5-hydroxytryptamine (5-HT)] receptors: 5-HT2 > 5-HT1D > 5-HT1C > 5-HT1B > 5-HT1A > 5-HT1E. Northern blots revealed a approximately 4.2-kilobase transcript localized in various brain regions, with the following rank order of abundance: striatum > olfactory tubercle > cerebral cortex > hippocampus. Expression of this clone in COS-7 cells resulted in the appearance of high affinity, saturable binding of (+)-[2-125I] iodolysergic acid diethylamide ([125I]LSD) with a Kd of 1.26 nM. Among endogenous biogenic amines, only 5-HT completely inhibited [125I]LSD binding (Ki = 150 nM). The inhibition of [125I]LSD binding by other serotonergic agonists and antagonists revealed a pharmacological profile that does not correlate with that of any previously described serotonin receptor subtype. In addition, this receptor exhibits high affinity for a number of tricyclic antipsychotic and antidepressant drugs, including clozapine, amoxipine, and amitriptyline. In HEK-293 cells stably transfected with this receptor, serotonin elicits a potent stimulation of adenylyl cyclase activity, which is blocked by antipsychotic and antidepressant drugs. The distinct structural and pharmacological properties of this receptor site indicate that it represents a completely novel subtype of serotonin receptor. Based on its affinity for tricyclic psychotropic drugs and its localization to limbic and cortical regions of the brain, it is likely that this receptor may play a role in several neuropsychiatric disorders that involve serotonergic systems.

Authors : Monsma F J , Shen Y , Ward R P , Hamblin M W , Sibley D R ,

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