FR-194921 is a potent, selective, and orally active antagonist for central adenosine A1 receptors with cognitive-enhancing and anxiolytic activity. FR194921 has same binding affinity profile among human, rat, and mouse.
The A1, A2A, A2B, and A3 adenosine receptors (ARs) are ubiquitous G protein-coupled receptors. The four AR subtypes have been implicated in several areas of therapeutic interest such as stroke and other ischemic conditions, as well as inflammation, neurodegenerative diseases, diabetes, and sleep regulation. A3 AR antagonists are of interest as therapeutic agents in glaucoma agents and inflammation. CAY10498 is a potent and selective A3 AR antagonist exhibiting a Ki of 37 nM with 60 and 200-fold selectivity over A1 and A2A adenosine receptors, respectively. CAY10498 is also a structural analog of reversine, a dedifferentiation agent of embryonic progenitor cells. However, no dedifferentiation effects or any connection between A3 AR antagonism and dedifferentiation have been demonstrated.
A1AR antagonist 4 (compound 22) is a highly developed chemical compound that acts as a potent and selective antagonist of the A1 adenosine receptor (A1AR). It possesses a pIC50 value of 5.51 and a pKi value of 6.29 [1].
Adenosine receptor inhibitor 1 is a highly potent and selective antagonist of adenosine receptor (AR). It exhibits exceptional affinity for A1 AR, A2A AR, A2B AR, and A3 AR, with respective Ki values of >1000, 68.5, >1000, >1000 nM. This compound demonstrates notable antinociceptive, anti-inflammatory, and peripheral analgesic properties. Therefore, Adenosine receptor inhibitor 1 holds great promise for investigating cancer and neurodegenerative diseases [1].