Skepinone-L

Skepinone-L is a potent, ATP-competitive inhibitor of p38 MAPK isoform p38α (IC₅₀ = 5 nM) and p38β (97% inhibition at 1 µM). It has little effect on a range of other kinases, including p38γ and p38δ. Skepinone-L dose-dependently blocks the phosphorylation of heat shock protein 27 (HSP27), a p38 MAPK substrate, in response to stimulation with anisomycin (Cat. No. 1549) in HeLa cells (IC₅₀ = 25 nM) or TNF-α in THP-1 cells.