Preladenant is an orally bioavailable antagonist of the adenosine A2A receptor (Kis = 1.1 and 2.5 nM for human and rat receptors, respectively). It is selective for A2A receptors over A1, A2B, and A3 receptors (Kis = >1,000, >1,700, and >1,000 nM, respectively) as well as a panel of 59 receptors, enzymes, and ion channels. Preladenant inhibits adenylate cyclase activity (Kbs = 1.3 and 0.7 nM for human and rat receptors, respectively) induced by the A2A receptor agonist CGS 21680 . It inhibits catalepsy induced by haloperidol in rats by 77 and 70% after 1 and 4 hours, respectively, when administered at a dose of 1 mg/kg. Preladenant also increases the efficacy of L-DOPA when used in combination with eltoprazine in a 6-OHDA rat lesion model of Parkinson’s disease dyskinesia.
A potent and selective antagonist at the adenosine A2A receptor. It is being researched as a potential treatment for Parkinson''s disease.
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