MRS5424 is a functional fluorescent agonist for the adenosine A2A receptor (A2AR) in which the fluorescent dye Alexa Fluor 532 is covalently attached to the A2AR agonist 2-[[2-[4-[2-(2-aminoethyl)-aminocarbonyl]ethyl]phenyl]ethylamino]-5'-N-ethyl-carboxamidoadenosine (APEC). This easy-to-synthesize new A2AR fluorescent ligand was shown to be extremely useful for determining the binding kinetic constants of A2AR in a real-time mode (Fernandez-Duenas et al., 2012). In addition, this fluorescent A2AR ligand is compatible with ligand-receptor interaction studies using fluorescent plate readers. Finally, it is important to mention that even though the sensitivity of this A2AR fluorescent ligand may not be as high as that observed for the marketed A2AR radioactive compounds, the use of such fluorescent derivative may have some advantages over radioactive probes, for example its safe delivery, manipulation and disposal, the short signal acquisition times, the feasibility to automate and to miniaturize, and finally its cost.
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