Abstract
This study deals with the characterization of 5-hydroxytryptamine (5-HT, serotonin) receptors positively linked to adenylyl cyclase in membranes from pig brain caudate. 5-HT and related agonists induced a concentration-dependent stimulation of adenylyl cyclase activity in pig caudate membranes, with the following rank order of potency (mean pEC50 values): 5-HT (7.1) ≥ 5-methoxytryptamine (6.9) > 5-carboxamidotryptamine (5.6) > sumatriptan (<5). Maximal stimulation by 5-HT averaged 35 pmol cyclic AMP/min/mg protein over a basal activity of 159 pmol cyclic AMP/min/mg protein. 5-Methoxytryptamine and 5-carboxamidotryptamine had similar efficacies to that of 5-HT, whereas sumatriptan was about half efficacious. Other compounds known as agonists at some 5-HT receptors were weakly potent (mean pEC50 values <5). They include the 5-HT1A receptor agonist, 8-hydroxy-2-(di-n-propylamino)tetralin hydrobromide (8-OH-DPAT), the 5-HT4 receptor agonist, renzapride and the 5-HT2 receptor agonist, (1-(2,5-dimethoxy-4-iodophenyl)-2 aminopropane) (DOI). In antagonist studies, methiothepin (0.1 and 1 μmol/l) shifted the 5-HT curve to the right with no depression of the Emax, yielding pKB values of 7.4–8.0. Clozapine (1 μmol/l) also produced surmountable antagonism of 5-HT-induced effects (pKB 6.9). Ketanserin (10 μmol/l) weakly antagonized 5-HT (pKB 5.0). The 5-HT4 receptor antagonists, tropisetron (ICS 205–930) and SDZ 205–557 (2-methoxy-4-amino-5-chloro-benzoic acid 2-(diethylamino) ethyl ester), each at 1 μmol/l, did not significantly alter the concentration-response curve of 5-HT. The present receptor shares some characteristics of the recently cloned 5-HT6 receptor (Monsma et al. (1993) Mol Pharmacol 43:320–327): similar pharmacological profile, location (striatum) and ability to stimulate adenylyl cyclase. It may thus represent the functional 5-HT6 receptor in its natural environment.
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Adham N, Kao HT, Schechter LE, Bard J, Olsen M, Urquhart D, Durkin M, Hartig PR, Weinshank RL, Branchek TA (1993) Cloning of another human serotonin receptor (5-HT1F): a fifth 5-HT1 receptor subtype coupled to the inhibition of adenylate cyclase. Proc Natl Acad Sci USA 90:408–412
Amlaiky N, Ramboz S, Boschert U, Plassat JL, Hen R (1992) Isolation of a mouse “5HT1E-like” serotonin receptor expressed predominantly in hippocampus. J Biol Chem 267:19761–19764
Bard JA, Zgombick J, Adham N, Vaysse P, Branchek TA, Weinshank RL (1993) Cloning of a novel human serotonin receptor (5-HT7) positively linked to adenylate cyclase. J Biol Chem 268: 23422–23426
Bradford MM (1967) A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Anal Biochem 72:248–254
Buchheit K-H, Gamse R, Pfannkuche H-J (1992) SDZ 205–557, a selective/surmountable antagonist for 5-HT4 receptors in the isolated guinea pig ileum. Naunyn-Schmiedeberg's Arch Pharmacol 345:387–393
Chneiweiss H, Prochiantz A, Glowinski J, Prémont J (1984) Biogenic amine-sensitive adenylate cyclases in primary culture of neuronal and glial cells from mesencephalon. Brain Res 302:363–370
Conner DA, Mansour TE (1990) Serotonin receptor-mediated activation of adenylyl cyclase in the neuroblastoma.NCB-20: a novel 5-hydroxytryptamine receptor. Mol Pharmacol 37:742–751
DeLean A, Stadel JM, Lefkowitz RJ (1980) A ternary complex model explains the agonist-specific binding properties of the adenylate cyclase-coupled beta-adrenergic receptor. J Biol Chem 255:7108–7117
Dumuis A, Bouhelal R, Sebben M, Cory R, Bockaert J (1988) A non-classical 5-hydroxytryptamine receptor positively coupled with adenylate cyclase in the central nervous system. Mol Pharmacol 34:880–887
Dumuis A, Sebben M, Bockaert J (1989) BRL 24924: a potent agonist at 5-HT4 receptors positively coupled with adenylate cyclase in colliculi neurons. Eur J Pharmacol 162:381–384
Fillion G, Rousselle JC, Beaudoin D, Pradelles P, Goiny M, Dray F, Jacob J (1979) Serotonin sensitive adenylate cyclase in horse brain synaptosomal membranes. Life Sci 24:1813–1822
Fillion G, Beaudoin D, Rousselle JC, Jacob J (1980) [3H]5-HT binding sites and 5-HT-sensitive adenylate cyclase in glial cell membrane fraction. Brain Res 198:361–374
Furchgott RF (1972) The classification of adrenoceptors (adrenergic receptors). An evaluation from the standpoint of receptor theory. In: Blaschko H, Muscholl E (eds) Catacholamines. Springer, Berlin Heidelberg New York Tokyo, pp 238–335
Glennon RA (1987) Central serotonin receptors as targets for drug research. J Med Chem 30:1–12
Grossman CJ, Kilpatrick GJ, Bunce KT (1993) Development of a radioligand binding assay for 5-HT4 receptors in guinea-pig and rat brain. Br J Pharmacol 109:618–624
Gudermann T, Levy FO, Birnbaumer M, Birnbaumer L, Kaumann AJ (1993) Human S31 serotonin receptor clone encodes a 5-hydroxytryptamine1E-like serotonin receptor. Mol Pharmacol 43:412–418
Hoyer D, Fozard JR, Saxena PR, Mylecharane EJ, Clarke DE, Martin GR, Humphrey PPA (1994) A new classification of receptors for 5-hydroxytryptamine (serotonin). Pharmacol Rev (in press)
Hoyer D, Waeber C, Schoeffter P, Palacios JM, Dravid A (1989) 5-HT1C-receptor-mediated stimulation of inositol phosphate production in pig choroid plexus. Naunyn-Schmiedeberg's Arch Pharmacol 339:252–258
Humphrey PPA, Hartig P, Hoyer D (1993) A proposed new nomenclature for 5-HT receptors. Trends Pharmacol Sci 14:233–236
Iorio LC, Barnett A, Leitz FH, Houser VP, Korduba CA (1983) SCH 23390, a potential benzazepine antipsychotic with unique interactions on dopaminergic systems. J Pharmacol Exp Ther 226: 462–468
Lovenberg TW, Erlander MG, Baron BM, Racke M, Slone AL, Siegel BW, Craft CM, Burns JE, Danielson PE, Sutcliffe JG (1993) Molecular cloning and functional expression of 5-HT1E-like rat and human 5-hydroxytryptamine receptor genes. Proc Natl Acad Sci USA 90:2184–2188
Markstein R, Hoyer D, Engel G (1986) 5-HT1A receptors mediate stimulation of adenylate cyclase in rat hippocampus. NaunynSchmiedeberg's Arch Pharmacol 333:335–341
Matthes H, Boschert U, Amlaiky N, Grailhe R, Plassat JL, Muscatelli F, Mattei MG, Hen R (1993) Mouse 5-hydroxytryptamine5A and 5-hydroxytryptamine5B receptors define a new family of serotonin receptors: cloning, functional expression, and chromosomal localization. Mol Pharmacol 43:313–319
McAllister G, Charlesworth A, Snodin C, Beer MS, Noble AJ, Middlemiss DN, Iversen LL, Whiting P (1992) Molecular cloning of a serotonin receptor from human brain (5 HT 1E): A fifth 5 HT 1-like receptor. Proc Natl Acad Sci USA 89:5517–5521
Monsma FJ Jr, Shen Y, Ward RP, Hamblin MW, Sibley DR (1993) Cloning and expression of a novel serotonin receptor with high affinity for tricyclic psychotropic drugs. Mol Pharmacol 43:320–327
Plassat JL, Boschert U, Amlaiky N, Hen R (1992) The mouse 5HT5 receptor reveals a remarkable heterogeneity within the 5-HT 1D receptor family. EMBO J 11:4779–4786
Plassat JL, Amlaiky N, Hen R (1993) Molecular cloning of a mammalian serotonin receptor that activates adenylate cyclase. Mol Pharmacol 44:229–236
Richardson BP, Engel G, Donatsch P, Stadler PA (1985) Identification of serotonin M-receptor subtypes and their specific blockade by a new class of drugs. Nature 316:126–131
Salomon Y, Londos C, Rodbell M (1974) A highly sensitive adenylate cyclase assay. Anal Biochem 58:541–548
Schoeffter P, Hoyer D (1989) How selective is GR 43175? Interactions with functional 5-HT1A, 5-HT1B, 5-HT1C and 5-HT1D receptors. Naunyn-Schmiedeberg's Arch Pharmacol 340:135–138
Schoeffter P, Waeber C (1993) A atypical 5-HT receptor stimulating adenylate cyclase activity in pig caudate membranes. Naunyn-Schmiedeberg's Arch Pharmacol 347:R124
Schoeffter P, Waeber C, Palacios JM, Hoyer D (1988) The 5-hydroxytryptamine 5-HT1D receptor subtype is negatively coupled to adenylate cyclase in calf substantia nigra. Naunyn-Schmiedeberg's Arch Pharmacol 337:602–608
Shen Y, Monsma FJ Jr, Metcalf MA, Jose PA, Hamblin MW, Sibley DR (1993) Molecular cloning and expression of a 5-hydroxytryptamine7 serotonin receptor subtype. J Biol Chem 268:18200–18204
Shenker A, Maayani S, Weinstein H, Green JP (1987) Pharmacological characterization of two 5-hydroxytryptamine receptors coupled to adenylate cyclase in guinea-pig hippocampal membranes. Mol Pharmacol 31:357–367
Zgombick JM, Schechter LE, Macchi M, Hartig PR, Branchek TA, Weinshank RL (1992) Human gene S31 encodes the pharmacologically defined serotonin 5-hydroxytryptamine1E receptor. Mol Pharmacol 42:180–185
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Correspondence to: P. Schoeffter at the above address
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Schoeffter, P., Waeber, C. 5-Hydroxytryptamine receptors with a 5-HT6 receptor-like profile stimulating adenylyl cyclase activity in pig caudate membranes. Naunyn-Schmiedeberg's Arch Pharmacol 350, 356–360 (1994). https://doi.org/10.1007/BF00178951
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DOI: https://doi.org/10.1007/BF00178951