In this study we have investigated the functional activity of GR127935 (2-methyl-4-(5-methyl-1,2,4 oxadiazol-3-yl)-biphenyl-[4-carboxylic acid 4-methoxy-3-(4-methyl-piperazine-1-yl)-phenyl]-amide) at human 5-HT 1Dα and 5-HT 1Dβ receptors which have been expressed in a Chinese Hamster Ovary (CHO) cell line. Using [ 35S]GTPγS binding to cell membranes as a measure of receptor-G protein coupling, GR127935 showed partial agonist activity in both 5-HT 1Dα and 5-HT 1Dβ receptor expressing cells ( E max: 29 and 31% above basal control; pEC 50: 8.6 and 9.7, respectively). GR127935 also acted as a potent antagonist at the 5-HT 1Dα (app. pA 2 8.5) and 5-HT 1Dβ (app. pA 2 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-HT 1Dα receptors which stimulate cAMP levels and 5-HT 1Dβ receptors which inhibit cAMP levels (app. pA 2 8.6 and 9.7, respectively). The 5H̄T 1-like receptor antagonist methiothepin showed negative intrinsic activity at both receptors in the [ 35S]GTPγS binding assay only. From studies using the receptor alkylating agent EEDQ (N-ethoxycarbonyl-2-methoxy-1,2-dihydroquinoline) the 5-HT 1Dα cell line displayed a lack of receptor reserve but it was evident in the 5-HT 1Dβ cell line. In previous studies we have also shown that agonist stimulation of 5-HT 1Dα receptors increases cAMP levels which may be due to high receptor expression. Further investigation using up to 1 μM EEDQ to reduce 5-HT 1Dα receptor number did not reveal an underlying inhibitory adenylyl cyclase response. In conclusion, GR127935 acts as a partial agonist, aswell as a potent antagonist, at the human 5-HT 1Dα and 5-HT 1Dβ receptors when expressed in CHO cells.
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