摘要:
We reveal how a N-scan SAR strategy (systematic substitution of each CH group with a N atom) was employed for quinolinone-based S1P(1) agonist 5 to modulate physicochemical properties and optimize in vitro and in vivo activity. The diaza-analog 17 displays improved potency (hS1P(1) RI; 17: EC50 = 0.020 mu M, 120% efficacy; 5: EC50 = 0.070 mu M, 110% efficacy) and selectivity (hS1P(3) Ca2+ flux; 17: EC50 >25 mu M; 5: EC50 = 1.5 mu M, 92% efficacy), as well as enhanced pharmacokinetics (17: CL = 0.15 L/h/kg, V-dss = 5.1 L/kg, T-1/2 = 24 h, % F = 110; 5: CL = 0.93 L/h/kg, V-dss = 11 L/kg, T-1/2 = 15 h, % F = 60) and pharmacodynamics (17: 1.0 mg/kg po, 24 h PLC POC = -67%; 5: 3 mg/kg po, 24 h PLC POC = -51%) in rat. (C) 2011 Elsevier Ltd. All rights reserved.