p38alpha inhibitor 2

p38α inhibitor 2 is a highly potent and selective p38α MAPK inhibitor, with a pIC50 of 9.6. p38α inhibitor 2 inhibits the hERG ion channel (IC50=27 μM) and shows a promising selectivity profile when tested in a panel of 51 other protein kinases (<30% inhibition at 10 μM concentration) and a panel of 141 other biological targets[1]. [1]. Raubo P, et al. The discovery and evaluation of 3-amino-2(1H)-pyrazinones as a novel series of selective p38α MAP kinase inhibitors [published online ahead of print, 2020 Jul 15]. Bioorg Med Chem Lett. 2020;30(18):127412.

R-130823 is a ighly selective inhibition against mitogen-activated protein kinase p38alpha (IC50=22 nM). The release of tumor necrosis factor-alpha, interleukin-1beta, -6 and -8 was inhibited in lipopolysaccharide-stimulated human blood pretreated by R-130823 , with IC50 values of 0.089, 0.066, 0.95 and 0.16 microM, respectively. R-130823 reduced the established hind paw swelling in rat adjuvant-induced arthritis, while methotrexate showed no suppression. In the same model, R-130823 ameliorated adjuvant-induced hyperalgesia with rapid onset and long duration comparable to a cyclooxygenase-2 inhibitor, celecoxib.