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- W2791030317 abstract "Background and Purpose Ligand–receptor binding kinetics is receiving increasing attention in the drug research community. The Motulsky and Mahan model, a one‐state model, offers a method for measuring the binding kinetics of an unlabelled ligand, with the assumption that the labelled ligand has no preference while binding to distinct states or conformations of a drug target. As such, the one‐state model is not applicable if the radioligand displays biphasic binding kinetics to the receptor. Experimental Approach We extended the Motulsky and Mahan model to a two‐state model, in which the kinetics of the unlabelled competitor binding to different receptor states (R 1 and R 2 ) can be measured. With this extended model, we determined the binding kinetics of unlabelled N ‐5′‐ethylcarboxamidoadenosine (NECA), a representative agonist for the adenosine A 1 receptor. Subsequently, an application of the model was exemplified by measuring the binding kinetics of other A 1 receptor ligands. In addition, limitations of the model were investigated as well. Key Results The kinetic rate constants of unlabelled NECA were comparable with the results of kinetic radioligand binding assays in which [ 3 H]‐NECA was used. The model was further validated by good correlation between simulated results and the experimental data. Conclusion The two‐state model is sufficient to analyse the binding kinetics of an unlabelled ligand, when a radioligand shows biphasic association characteristics. We expect this two‐state model to have general applicability for other targets as well." @default.
- W2791030317 created "2018-03-29" @default.
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- W2791030317 date "2018-04-17" @default.
- W2791030317 modified "2023-10-10" @default.
- W2791030317 title "A two‐state model for the kinetics of competitive radioligand binding" @default.
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- W2791030317 doi "https://doi.org/10.1111/bph.14184" @default.
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