Development of a radioligand binding assay for 5‐HT4 receptors in guinea‐pig and rat brain
Open Access
- 19 July 1993
- journal article
- Published by Wiley in British Journal of Pharmacology
- Vol. 109 (3), 618-624
- https://doi.org/10.1111/j.1476-5381.1993.tb13617.x
Abstract
1 The 5-HT4 receptor antagonist, GR113808, has been radiolabelled to a high specific activity with tritium. 2 Characterization of specific [3H]-GR113808 binding in homogenates of guinea-pig striatum and hippocampus revealed a single site of high affinity (Kd values 0.20 and 0.13 nm respectively). 3 [3H]-GR113808 binding was reversible and displayed rapid kinetics such that association and dissociation were complete within 3 min. 4 Specific [3H]-GR113808 binding was potently and stereoselectively inhibited by agonists and antagonists acting at the 5-HT4 receptor but not by compounds selective for other 5-HT receptors or other neurotransmitter receptors. 5 Autoradiographic analysis revealed a discrete localization in both guinea-pig and rat brain with high concentrations of binding in brain areas such as the striatum, substantia nigra and olfactory tubercle. 6 [3H]-GR113808 binding to homogenates of guinea-pig striatum meets the criteria for labelling of the 5-HT4 receptor and, as such, represents the first characterization of this receptor in a radioligand binding assay.Keywords
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