Talmapimod hydrochloride is a selective and ATP-competitive p38α inhibitor (IC50: 9 nM). It also shows about 10-fold selectivity over p38β, and at least 2000-fold selectivity over a panel of 20 other kinases, including other MAPKs.
PF-03715455 potently inhibits LPS-induced TNFα production in human whole blood (IC50=1.7 nM). PF-03715455 is an effective inhibitor of inhaled p38 MAPK. PF-03715455 displays some selectivity for p38α over p38β (respective IC50: 0.88 and 23 nM). PF-0371545