Development of an improved IP(1) assay for the characterization of 5-HT(2C) receptor ligands

Assay and Drug Development Technologies
Jean Y ZhangRavikumar Peri

Abstract

The 5-hydroxytryptamine 2C (5-HT(2C)) receptor is a member of the serotonin 5-HT(2) subfamily of G-protein-coupled receptors signaling predominantly via the phospholipase C (PLC) pathway. Stimulation of phosphoinositide (PI) hydrolysis upon 5-HT(2C) receptor activation is traditionally assessed by measuring inositol monophosphate (IP(1)) using time-consuming and labor-intensive anion exchange radioactive assays. In this study, we have developed and optimized a cellular IP(1) assay using homogeneous time-resolved fluorescence (HTRF), a fluorescence resonance energy transfer (FRET)-based technology (Cisbio; Gif sur Yvette, France). The measurement is simple to carry out without the cumbersome steps associated with radioactive assays and may therefore be used as an alternative tool to evaluate PI hydrolysis activated by 5-HT(2C) agonists. In Chinese hamster ovary (CHO) cells stably expressing 5-HT(2C) receptors, characterization of 5-HT(2C) agonists with the HTRF platform revealed a rank order of potency (EC(50), nM) comparable to that from intracellular calcium mobilization studies measured by the fluorometric imaging plate reader (FLIPR). A similar rank order of potency was seen with conventional radioactive PI assay with the ex...Continue Reading

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Citations

Dec 2, 2010·Nature Reviews. Drug Discovery·Dennis A SmithEdward H Kerns
Jun 9, 2016·Pflügers Archiv : European journal of physiology·Yuan HaoWing H Ko
Jun 19, 2018·Journal of Clinical Psychopharmacology·Svetlana A IvanovaAnton J M Loonen
Jun 30, 2019·Cellular Signalling·Candi M EsquinaAngeline M Lyon

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Methods Mentioned

BETA
fluorescence imaging
scintillation proximity assay
fluorescence resonance energy
MDS
transfection
FRET

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