TG101209 is a selective JAK2 inhibitor with IC50 of 6 nM.

JAK2:6 nM

与安慰剂处理的动物相比,TG101209处理的动物体内循环肿瘤细胞负荷显著减少,呈剂量依赖性,在+11天时减少比例达到20%.100 mg/kg TG101209有效延长JAK2V617F诱发的患病动物的存活时间（10天）.

TG101209抑制HCC2429和H460肺癌细胞中存活素,并降低STAT3的磷酸化作用。TG101209在表达人JAK2V617F的急性髓细胞性白血病细胞系中,诱导细胞周期阻滞和细胞凋亡,并抑制JAK2V617F,STAT5和STAT3的磷酸化。TG101209抑制表达JAK2V617F或MPLW515L突变体的Ba/F3细胞生长,IC50为B200 nM。TG101209抑制来自携带JAK2V617F或MPL515突变的原始祖细胞的造血集落的生长。TG101209明显减少STAT5磷酸化,而不影响STAT5蛋白质的总量。TG101209消除BCR-JAK2和STAT5的磷酸化,减少Bcl-xL表达,并引发转化的Ba/F3细胞凋亡。

Cell-free Kinase Activity Assays: IC50 values for TG101209 are determined using a luminescence-based kinase assay with recombinant JAK2, VEGFR2/KDR, and JAK3 obtained from Upstate Cell Signaling Solutions. Kinase reactions are carried out in a buffer consisting of 40 mM Tris buffer (pH 7.4), 50 mM MgCl2, 800?M EGTA, 350?M Triton X-100, 2?M ?-mercaptoethanol, 100?M peptide substrate, and an appropriate amount of JAK2, VEGFR2/KDR or JAK3 such that the assay is linear over 60 minutes. The reaction is initiated by the addition of 10?L of ATP to a final concentration of 3 mM and terminated by the addition of Kinase-Glo reagent after 60 minutes. Luciferase activity is quantified using an Ultra 384 instrument set for luminosity measurements. IC50 values are derived from experimental data using the non-linear curve fitting capabilities of the GraphPad Prism 4.0 software. The single concentration inhibition data for a panel of 63 kinases is determined using the SelectScreen TM service.

In brief, approximately 2 × 103 cells are plated into microtiterplate wells in 100 ml RPMI-1640 growth media with indicated concentrations of TG101209. The relative growth of cells is quantified at 24-hour intervals using Cell Proliferation Kit II (XTT) as per manufacturer's guidelines. After incubation, 20 mL of XTT is added to the wells and allowed to incubate for 4-6 hours. The colored formazan product is measured spectrophotometrically at 450 nm with correction at 650 nm, and IC50 values are determined using the GraphPad Prism 4.0 software. Data are subjected to a non-linear regression-fit analysis and IC50 values are determined as the concentration that inhibited proliferation by 50%. All experiments are done in triplicate and the results normalized to growth of untreated cells.(Only for Reference)