Synonyms: PB 203580, RWJ 64809

4-(4-Fluorophenyl)-2-(4-methylsulfinylphenyl)-5-(4-pyridyl)1H-imidazole
>99%
C21H16FN3OS
M.W. 377.43

SB 203580 is a pyridinyl imidazole that suppresses the activation of MAPKAP kinase-2 and inhibits the phosphorylation of heat shock protein (HSP) 27 in response to IL-1, cellular stresses and bacterial endotoxin in vivo. It does not inhibit JNK or p42 MAP kinase and therefore, is useful for studying the physiological roles and targets of p38 MAPK and MAPKAP kinase-2. It has been shown to induce the activation of the serine/threonine kinase Raf-1 and has been reported to inhibit cytokine production.

Solubility: Soluble in DMSO at 100 mg/mL; soluble in ethanol at 12.5 mg/mL with warming; very poorly soluble in water; maximum solubility in plain water is estimated to be about 10-50 µM;

Important, highly specific inhibitor of the kinase known variously as p38, p40, CSBP, or RK. This kinase is a homolog of MAP kinase. Gallagher, T.F., et al. "2,4,5-Triarylimidazole inhibitors of Il-1 biosynthesis." Bioorg. Med. Chem. Lett. 5: 1171-1176 (1995). Cuenda, A., et al. "SB203580 is a specific inhibitor of MAP kinase homologue which is stimulated by cellular stresses and interleukin-1." FEBS Lett.. 364: 229-233 (1995). Hazzalin, C.A., et al. "Effects of the inhibition of p38/RK MAP kinase on induction of five fos and jun genes by diverse stimuli." Oncogene 15: 2321-2331 (1997).

Store at  -20 ºC