title: GR127935 acts as a partial agonist at recombinant human 5-HT1D alpha and 5-HT1D beta receptors.
abstract: In this study we have investigated the functional activity of GR127935 (2-methyl-1,2,4 oxadiazol-3-yl)-biphenyl-[4-carboxylic acid 4-methoxy-3-(4-methyl-piperazine-1-yl]-amide) at human 5-HT1D alpha and 5-HT1D beta receptors which have been expressed in a Chinese Hamster Ovary (CHO) cell line. Using [35S] GTP gamma S binding to cell membranes as a measure of receptor-G protein coupling. GR127935 showed partial agonist activity in both 5-HT1D alpha and 5-HT1D beta receptor expressing cells (Emax: 29 and 31% above basal control; pEC50: 8.6 and 9.7, respectively). GR127935 also acted as a potent antagonist at the 5-HT1D alpha (app. pA2 8.5) and 5-HT1D beta (app. pA2 9.1) receptors. From studies measuring cAMP accumulation in cultured CHO cells GR127935 also displayed partial agonism, as well as acting as a potent antagonist at the 5-HT1D alpha receptors which stimulate cAMP levels and 5-HT1D beta receptors which inhibit cAMP levels (app. pA2 8.6 and 9.7, respectively). The 5\-HT1-like receptor antagonist methiothepin showed negative intrinsic activity at both receptors in the [35S]GTP gamma S binding assay only. From studies using the receptor alkylating agent EEDQ (N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline) the 5-HT1D alpha cell line displayed a lack of receptor reserve but it was evident in the 5-HT1D beta cell line. In previous studies we have also shown that agonist stimulation of 5-HT1D alpha receptors increases cAMP levels which may be due to high receptor expression. Further investigation using up to 1 microM EEDQ to reduce 5-HT1D alpha receptor number did not reveal an underlying inhibitory adenylyl cyclase response. In conclusion, GR127935 acts as a partial agonist, as well as a potent antagonist, at the human 5-HT1D alpha and 5-HT1D beta receptors when expressed in CHO cells.
authors.affiliation: Psychiatry Research Department, SmithKline Beecham Pharmaceuticals, Harlow, Essex, UK.
authors.forename: J M
authors.initials: JM
authors.lastname: Watson
authors.forename: M J
authors.initials: MJ
authors.lastname: Burton
authors.forename: G W
authors.initials: GW
authors.lastname: Price
authors.forename: B J
authors.initials: BJ
authors.lastname: Jones
authors.forename: D N
authors.initials: DN
authors.lastname: Middlemiss
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism; D000477:Alkylating Agents / Q000494:pharmacology; D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D000242:Cyclic AMP / Q000378:metabolism; D019204:GTP-Binding Proteins / Q000378:metabolism*; D016244:Guanosine 5'-O-(3-Thiotriphosphate) / Q000378:metabolism*; D006801:Humans; D016015:Logistic Models; D010069:Oxadiazoles / Q000494:pharmacology*; D010879:Piperazines / Q000494:pharmacology*; D011804:Quinolines / Q000494:pharmacology; D011985:Receptors, Serotonin / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D011994:Recombinant Proteins / Q000096:biosynthesis; D012702:Serotonin Antagonists / Q000494:pharmacology; D017366:Serotonin Receptor Agonists / Q000494:pharmacology*
chemical_list: D000477:Alkylating Agents; D010069:Oxadiazoles; D010879:Piperazines; D011804:Quinolines; D011985:Receptors, Serotonin; D011994:Recombinant Proteins; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists; C090701:GR 127935; D016244:Guanosine 5'-O-(3-Thiotriphosphate); C000470:EEDQ; D000242:Cyclic AMP; D019204:GTP-Binding Proteins; D000262:Adenylyl Cyclases