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- W1965749017 abstract "A functional assay, based on aequorin-derived luminescence triggered by receptor-mediated changes in intracellular calcium levels, was used to examine relative potency and efficacy of the μ-opioid agonists endomorphin-1, endomorphin-2, morphiceptin, and their position 3-substituted analogs, as well as the δ-agonist deltorphin-II. The results of the aequorin assay, performed on recombinant cell lines, were compared with those obtained in the functional assay on isolated tissue preparations (guinea pig ileum and mouse vas deferens). A range of nine opioid peptide ligands produced a similar rank order of potency for the μ- and δ-opioid receptor agonists in both functional assays. The highest potency at the μ-receptor was observed for endomorphin-1, endomorphin-2, and [d-1-Nal<sup>3</sup>]morphiceptin, whereas deltorphin-II was the most potent δ-receptor agonist. In the aequorin assay, the μ- and δ-agonist-triggered luminescence was inhibited by the opioid antagonists naloxone and naltrindole, respectively. We can conclude that the use of the aequorin assay for new μ- and δ-receptor-selective opioid analogs gives pharmacologically relevant data and allows high-throughput compound screening, which does not involve radioactivity or animal tissues. This is the first study that validates the application of this assay in the screening of opioid analogs." @default.
- W1965749017 created "2016-06-24" @default.
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- W1965749017 date "2006-02-23" @default.
- W1965749017 modified "2023-09-30" @default.
- W1965749017 title "Functional Characterization of Opioid Receptor Ligands by Aequorin Luminescence-Based Calcium Assay" @default.
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- W1965749017 doi "https://doi.org/10.1124/jpet.105.099986" @default.
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