Biochem/physiol Actions

BAY 60-6583 is a potent adenosine receptor A2b (A2bR) partial agonist (Ki against 0.3 nM [3H]PSB-603 for binding human/mouse/rat A2bR = 114/136/100 nM) that selectively induces cAMP-dependent transcription activity in CHO transfectants expressing human A2bR (EC50 ~100 nM), but not A1R or A2aR, while exhibiting no affinity toward human/rat/mouse A2aR. BAY 60-6583 also displays low-affinity antagonistic activity toward A1R (Ki against 1 nM [3H]CCPA for binding human/mouse/rat A1R = 387/351/514 nM; IC50 = 7.4 µM against 100 nM CCPA-induced hA1R β-arrestin recruitment) and A3R (Ki against 10 nM [3H]NECA for binding human/mouse/rat A3R = 223/3920/2750 nM; IC50 = 6.7 µM against 30 nM Cl-IB-MECA-induced hA3R β-arrestin recruitment). BAY 60-6583 is widely administered in animals in vivo via i.p. (0.1-80 mg/kg) or i.v. (0.2-2 mg/kg) for studying A2bR-mediated biological responses.