SP600125

FLT3

220, 23

Mouse LPS/TNF model (female CD-1)

0–5 uM, dissolved in 0.1% DMSO

Dissolved in PPCES (30% PEG-400/20% polypropylene glycol/15% Cremophor EL/5% ethanol/30% saline)

SP600125 is originally characterized as a selective ATP-competitive inhibitor of c-Jun N-terminal kinase JNK. In Jurkat T cells, SP600125 inhibits the phosphorylation of c-Jun with IC50 of 5 uM to 10 uM. In CD4+ cells, such as Th0 cells isolated from either human cord or peripheral blood, SP600125 blocks cell activation and differentiation and inhibits the expression of inflammatory genes COX-2, IL-2, IL-10, IFN-gamma, and TNF-alpha, with IC50 of 5 uM to 12 uM. [1] However, later studies reveal that SP600125 also suppresses aryl hydrocarbon receptor (AhR) [2], Mps1 [3], and a panel of other serine/threonine kinases, including Aurora kinase A, FLT3, MELK, and TRKA [4]. In a mouse beta cells MIN6, SP600125 (20 uM) induces the phosphorylation of p38 MAPK and its downstream CREB-dependent promoter activation. [5] In HCT116 cells, SP600125 (20 uM) blocks the G2 phase to mitosis transition and induces endoreplication. This ability of SP600125 is independent of JNK inhibition, but due to its inhibition of CDK1-cyclin B activation upstream of Aurora A and Polo-like kinase 1. [6]

72 hours

Cells are seeded in 384 well-plates. One day after seeding, the cells are treated with SP600125 for 72 hours and the plates are then processed using a CellTiter-Glo assay. Inhibitory activity is evaluated comparing treated versus control data and IC50 value of proliferation is calculated.

SP600125 (Nsc75890) is a broad-spectrum JNK inhibitor for JNK1, JNK2 and JNK3 with IC50 of 40 nM, 40 nM and 90 nM in cell-free assays, respectively; 10-fold greater selectivity against MKK4, 25-fold greater selectivity against MKK3, MKK6, PKB, and PKCα, and 100-fold selectivity against ERK2, p38, Chk1, EGFR etc. SP600125 is also a broad‐spectrum inhibitor of serine/threonine kinases including Aurora kinase A，FLT3 and TRKA with of IC50 of 60 nM, 90 nM and 70 nM. SP600125 inhibits autophagy and activates apoptosis.