A 804598 is a potent and selective antagonist of P2X7 receptor with IC50 values of 8.9, 9.9 and 10.9 nM for mouse, rat and human P2X7 receptors, respectively [1].
P2X purinoceptor 7 (P2X7 receptor) is a purinoceptor and is activated by high concentrations of ATP. P2X7 receptor plays an important role in ATP-mediated cell death, inflammation and regulation of receptor trafficking.
A 804598 is a potent and selective P2X7 receptor antagonist. In differentiated THP-1 cells that expressed human P2X7 receptors, A 804598 inhibited BzATP stimulated Yo-Pro uptake and release of IL-1β. In 1321N1 cells expressed recombinant rat P2X7 receptor, A 804598 showed high affinity with Kd = 2.4 nM [1]. A 804598 inhibited BZ-ATP stimulated calcium influx with IC50 value of 28.71 nM in a concentration-dependent way. A-804598 was a potent P2X7 receptor antagonist with Ki value of 7.51 nM [2].
In adult male rats, footshock increased the mRNA levels of CD14 and IL-1β in the paraventricular nucleus. While A-804598 (25 mg/kg) partially inhibited these effects [3].
References:
[1]. Donnelly-Roberts DL, Namovic MT, Surber B, et al. [3H]A-804598 ([3H]2-cyano-1-[(1S)-1-phenylethyl]-3-quinolin-5-ylguanidine) is a novel, potent, and selective antagonist radioligand for P2X7 receptors. Neuropharmacology, 2009, 56(1): 223-229.
[2]. Able SL, Fish RL, Bye H, et al. Receptor localization, native tissue binding and ex vivo occupancy for centrally penetrant P2X7 antagonists in the rat. Br J Pharmacol. 2011, 162(2): 405-414.
[3]. Catanzaro JM1, Hueston CM, Deak MM, et al. The impact of the P2X7 receptor antagonist A-804598 on neuroimmune and behavioral consequences of stress. Behav Pharmacol, 2014, 25(5-6): 582-598.