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MAP kinase-activated protein kinase 2 (MAPKAP2, MK2) is a stress-activated serine/threonine protein kinase that is phosphorylated by p38 MAP kinase and is involved in diverse cellular functions with a central role in inflammation. MK2 inhibitor III is a potent, cell-permeable inhibitor of MK2 (IC50 = 8.5 nM). It less potently blocks MK3 and MK5 (IC50s = 210 and 81 nM, respectively) and is weak or inactive against several other kinases, including other p38 MAP kinase targets. MK2 inhibitor III prevents LPS-induced synthesis of TNF-α in human monocyte-like U937 cells (IC50 = 4.4 µM).

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