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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/172324
Remote control of movement disorders using a photoactive adenosine A(2A) receptor antagonist
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G protein-coupled adenosine receptors are promising therapeutic targets for a wide range of neuropathological conditions, including Parkinson's disease (PD). However, the ubiquity of adenosine receptors and the ultimate lack of selectivity of certain adenosine-based drugs have frequently diminished their therapeutic use. Photopharmacology is a novel approach that allows the spatiotemporal control of receptor function, thus circumventing some of these limitations. Here, we aimed to develop a light-sensitive caged adenosine A(2A) receptor (A(2A)R) antagonist to photocontrol movement disorders. We synthesized MRS7145 by blocking with coumarin the 5-amino position of the selective A(2A)R antagonist SCH442416, which could be photoreleased upon violet light illumination (405 nm). First, the light-dependent pharmacological profile of MRS7145 was determined in A(2A)R-expressing cells. Upon photoactivation, MRS7145 precluded A(2A)R ligand binding and agonist-induced cAMP accumulation. Next, the ability of MRS7145 to block A(2A)R in a light-dependent manner was assessed in vivo. To this end, A(2A)R antagonist-mediated locomotor activity potentiation was evaluated in brain (striatum) fiber-optic implanted mice. Upon irradiation (405 nm) of the dorsal striatum, MRS7145 induced significant hyperlocomotion and counteracted haloperidol-induced catalepsy and pilocarpine-induced tremor. Finally, its efficacy in reversing motor impairment was evaluated in a PD animal model, namely the hemiparkinsonian 6-hydroxydopamine (6-OHDA)-lesioned mouse. Photo-activated MRS7145 was able to potentiate the number of contralateral rotations induced by L-3,4-dihydroxyphenylalanine (L-DOPA). Overall, MRS7145 is a new light-operated A(2A)R antagonist with potential utility to manage movement disorders, including PD.
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TAURA, Jaume, et al. Remote control of movement disorders using a photoactive adenosine A(2A) receptor antagonist. Journal of Controlled Release. 2018. Vol. 283, num. 135-142. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/172324