SB203580 Unit size Cat. code Docs Qty Price
p38 MAP Kinase Inhibitor
5 mg

p38 MAP Kinase Inhibitor

SB203580 is a pyridinyl imidazole inhibitor widely used to elucidate the roles of p38 mitogen-activated protein (MAP) kinase [1].

SB203580 inhibits also the phosphorylation and activation of protein kinase B (PKB, also known as Akt) [2]. Both kinases are involved in a wide array of signaling pathways, including the TLR signaling pathway [3].

Moreover, several studies suggest that p38 MAPKs regulate distinct phases of autophagy. p38 can elicit autophagy via Beclin1. Contrarily, p38α has also been reported to inhibit autophagy by interfering with the trafficking of Atg9.



1. Cuenda A. et al., 1995. SB 203580 is a specific inhibitor of a MAP kinase homologue which is stimulated by cellular stresses and interleukin-1. FEBS Lett. 364:229-233.
2. Lali FV. et al., 2000. The pyridinyl imidazole inhibitor SB203580 blocks phosphoinositide-dependent protein kinase activity, protein kinase B phosphorylation, and retinoblastoma hyperphosphorylation in interleukin-2-stimulated T cells independently of p38 mitogen-activated protein kinase. J Biol Chem. 275(10):7395-402.
3. Jarnicki AG. et al., 2008. Attenuating Regulatory T Cell Induction by TLR Agonists through Inhibition of p38 MAPK Signaling in Dendritic Cells Enhances Their Efficacy as Vaccine Adjuvants and Cancer Immunotherapeutics. J. Immunol., 180: 3797 - 3806.

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Working concentration: 1-10 μM

CAS number: 152121-47-6

Purity: ≥98% (UHPLC)

Solubility: DMSO (50 mg/ml)

Synonym: 4-(4’-Fluorophenyl)-2-(4’-methylsulfinylphenyl)-5- (4’-pyridyl)-imidazole

Molecular weight: 377.44

Formula: C6H16FN3OS

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SB203580 is provided as a translucent film.

  • 5 mg

SB203580 is and shipped at room temperature.

Store at -20°C in the dark.

Solid product is stable 1 year at -20°C.

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SB203580 chemical properties

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