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• W2094580786 abstract "RT - PCR technique was used to clone the human 5-HT(4(e)) receptor (h5-HT(4(e))) from heart atrium. We showed that this h5-HT(4(e)) receptor splice variant is restricted to brain and heart atrium. Recombinant h5-HT(4(e)) receptor was stably expressed in CHO and C6-glial cell lines at 347 and 88 fmol mg(-1) protein, respectively. Expression of h5-HT(4(e)) receptors at the cell membrane was confirmed by immunoblotting. The receptor binding profile, determined by competition with [(3)H]-GR113808 of a number of 5-HT(4) ligands, was consistent with that previously reported for other 5-HT(4) receptor isoforms. Surprisingly, we found that the rank order of potencies (EC(50)) of 5-HT(4) agonists obtained from adenylyl cyclase functional assays was inversely correlated to their rank order of affinities (K(i)) obtained from binding assays. Furthermore, EC(50) values for 5-HT, renzapride and cisapride were 2 fold lower in C6-glial cells than in CHO cells. ML10302 and renzapride behaved like partial agonists on the h5-HT(4(e)) receptor. These results are in agreement with the reported low efficacy of the these two compounds on L-type Ca(2+) currents and myocyte contractility in human atrium. A constitutive activity of the h5-HT(4(e)) receptor was observed in CHO cells in the absence of any 5-HT(4) ligand and two 5-HT(4) antagonists, GR113808 and ML10375, behaved as inverse agonists. These data show that the h5-HT(4(e)) receptor has a pharmacological profile which is close to the native h5-HT(4) receptor in human atrium with a functional potency which is dependent on the cellular context in which the receptor is expressed." @default.
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• W2094580786 date "2000-02-01" @default.
• W2094580786 modified "2023-10-15" @default.
• W2094580786 title "Isolation of the serotoninergic 5-HT_4(e)receptor from human heart and comparative analysis of its pharmacological profile in C6-glial and CHO cell lines" @default.
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• W2094580786 doi "https://doi.org/10.1038/sj.bjp.0703101" @default.
• W2094580786 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1571890" @default.
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