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Tpl2 kinase inhibitor is an inhibitor of tumor progression locus 2 (Tpl2; IC50 = 0.05 µM).1 It is selective for Tpl2 over MEK, p38 MAPK, Src, MK2, and PKC (IC50s = >40, 180, >400, 110, and >400 µM, respectively). Tpl2 kinase inhibitor inhibits LPS-induced TNF-α production in isolated human monocytes and whole blood (IC50s = 0.7 and 8.5 µM, respectively). It enhances differentiation induced by calcitriol in HL-60 and U937 leukemia cells when used at a concentration of 5 µM.2 Tpl2 kinase inhibitor (5 µM) inhibits the proliferation of KG-1a leukemia cells.3

1.Garvin, L.K., Green, N., Hu, Y., et al.Inhibition of Tpl2 kinase and TNF-α production with 1,7-naphthyridine-3-carbonitriles: Synthesis and structure-activity relationshipsBioor. Med. Chem. Lett.15(23)5288-5292(2005) 2.Wang, X., and Studzinski, G.P.Expression of MAP3 kinase COT1 is up-regulated by 1,25-dihydroxyvitamin D3 in parallel with activated c-jun during differentiation of human myeloid leukemia cellsJ. Steroid. Biochem. Mol. Biol.121(1-2)395-398(2010) 3.Wang, X., Gocek, E., Novik, V., et al.Inhibition of Cot1/Tlp2 oncogene in AML cells reduces ERK5 activation and up-regulates p27Kip1 concomitant with enhancement of differentiation and cell cycle arrest induced by silibinin and 1,25-dihydroxyvitamin D3Cell Cycle9(22)4542-4551(2010)

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