Background:

SB203580 HCl is a specific inhibitor of p38-MAPKs with IC50 value of 0.6 μM [1].

SB203580 is an inhibitor of p38-MAPKα and p38-MAPKβ. In neonatal myocytes, SB203580 prevented p38-MAPK from activating MAPKAPK2 with IC50 value of 70 nM. It also significantly suppressed MAPKAPK2 activation in by IL-1, osmotic stress or arsenite in KB cells. In neonatal rat ventricular myocytes, SB203580 inhibited JNK activity of activating c-Jun with IC50 value of 3-10 μM. Besides that, SB203580 affected the phosphorylation of small heat shock proteins caused by MAPKAPK2. It inhibited the IL-1-, chemical- or osmotic stress-stimulated HSP27 phosphorylation with IC50 value of< 1μM in KB cells [1, 2].

参考文献:
[1] Cuenda A, Rouse J, Doza Y N, et al. SB 203580 is a specific inhibitor of a MAP kinase homologue which is stimulated by cellular stresses and interleukin-1. FEBS letters, 1995, 364(2): 229-233.
[2] Clerk A, Sugden P H. The p38-MAPK inhibitor, SB203580, inhibits cardiac stress-activated protein kinases/c-Jun N-terminal kinases (SAPKs/JNKs). FEBS letters, 1998, 426(1): 93-96.