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Interaction of arylpiperazines with 5-HT1A, 5-HT1B, 5-HT1C and 5-HT1D receptors: do discriminatory 5-HT1B receptor ligands exist?

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Summary

The effects of several putative 5-HT1 receptorsubtype selective ligands were investigated in biochemical models for 5-HT1A, 5-HT1B, and 5-HT1D receptors (inhibition of forskolin-stimulated adenylate cyclase activity in calf hippocampus, rat and calf substantia nigra, respectively) and 5-HT1C receptors (stimulation of inositol phosphates production in pig choroid plexus). Following compounds were studied: 5-HT (5-hydroxytryptamine), TFMPP (1-(mtrifluoromethylphenyl)piperazine), mCPP (1-m-chlorophe-nyl)piperazine, 1 CGS 12066 (7-trifluoromethyl-4-(4-methyl1-piperazinyl)-pyrrolo[1,2-a]quinoxaline 1), isamoltane (CGP 361A, 1-(2-(1-pyrrolyl)-phenoxy)-3-isopropylamino-2-propranol), quipazine, 1-NP (1-(1-naphthyl)piperazine), and PAPP (LY165163, 1-[2-(4-aminophenyl)ethyl]-4-(3-trifluoromethylphenyl)-piperazine). Among reported 5-HT1B receptor selective drugs, TFMPP had similar potency at 5HT1A, 5-HT1B and 5-HT1C receptors, mCPP did not separate between 5-HT1B and 5-HT1C receptors, CGS 12066 was equipotent at 5-HT1B and 5-HT1D receptors, and isamoltane was only slightly 5-HTIB versus 5-HT1A selective. Quipazine showed equal potency at 5-HTIB and 5-HT1C receptors and 1-NP did not discriminate between the four receptor subtypes. PAPP described as 5-HT1A receptor selective, was equally potent at 5-HT1A and 5-HT1D receptors. The potencies determined in second messenger studies were in good agreement with the affinity values determined in radioligand binding studies. Thus 5-HT1A, 5-HT1B, 5-HT1C and 5-HT1D receptors have different pharmacological profiles as predicted from radioligand binding studies. Despite claims to the contrary, none of the tested compounds had actual selectivity for a given 5-HT1 receptor subtype. Of interest were the properties of several of these drugs, which behaved as agonists at some receptors and as antagonists at others (e. g. quipazine, 1-NP, PAPP and isamoltane).

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    Philippe Schoeffter & Daniel Hoyer

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Schoeffter, P., Hoyer, D. Interaction of arylpiperazines with 5-HT1A, 5-HT1B, 5-HT1C and 5-HT1D receptors: do discriminatory 5-HT1B receptor ligands exist?. Naunyn-Schmiedeberg's Arch Pharmacol 339, 675–683 (1989). https://doi.org/10.1007/BF00168661

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