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• W2156106424 abstract "The measurement of intracellular calcium response transients in living mammalian cells is a popular functional assay for identification of agonists and antagonists to receptors or channels of pharmacological interest. In recent years, advances in fluorescence-based detection techniques and automation technologies have facilitated the adaptation of this assay to 384-well microplate format high-throughput screening (HTS) assays. However, the cost and time required performing the intracellular calcium HTS assays in the 384-well format can be prohibitive for HTS campaigns of greater than 1 x 10(6) wells. For these reasons, it is attractive to miniaturize intracellular calcium functional assays to the 1536-well microplate format, where assay volumes and plate throughput can be decreased by several fold. The focus of the research described in this article is the miniaturization of an intracellular calcium assay to 1536-well plate format. This was accomplished by modifying the hardware and software of a fluorometric imaging plate reader (FLIPR) to enable transfer of nanoliters of test compound directly to a 1536-well assay plate, and measure the resulting calcium response from all 1536 wells simultaneously. An intracellular calcium functional assay against the rat muscarinic acetylcholine receptor subtype 1 (rmAchR1) G-protein coupled receptor (GPCR) was miniaturized and executed on this modified instrument. In experiments measuring the activity of known muscarinic receptor agonists and antagonists, the miniaturized FLIPR assay gave EC(50) and IC(50) values and rank order potency comparable to the 384-well format assays. Calculated Z' factors for the miniaturized agonist and antagonist assays were, respectively, 0.56 +/- 0.21 and 0.53 +/- 0.22, which were slightly higher (Z'(agonist) = 0.55 +/- 0.33) and lower (Z'(antagonist) = 0.70 +/- 0.18) than the corresponding values in the 384-well assays. A mock agonist HTS campaign against the muscarinic receptor in miniaturized format was able to identify all wells spiked with the rmAchR1 agonist carbachol." @default.
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• W2156106424 date "2004-08-01" @default.
• W2156106424 modified "2023-10-16" @default.
• W2156106424 title "Miniaturization of Intracellular Calcium Functional Assays to 1536-Well Plate Format Using a Fluorometric Imaging Plate Reader" @default.
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• W2156106424 doi "https://doi.org/10.1177/1087057104264038" @default.
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