SGI-1776 (Pim-Kinase Inhibitor IX) has been used in trials studying the treatment of Prostate Cancer, Non-Hodgkins Lymphoma, and Relapsed/Refractory Leukemias.

FLT3:44 nM, Pim1:7 nM, Pim3:69 nM, Pim2:363 nM

SGI-1776已经显示出针对白血病和实体瘤细胞系模型的临床前活性,其IC50值为0.005-11.68 mM.在31个实体瘤异种移植物中的9个和8个可评估的ALL异种移植物中的1个中,SGI-1776诱导体内EFS分布的显著差异.SGI-1776对携带MV-4-11肿瘤的小鼠模型有效.

SGI-1776诱导CLL细胞剂量依赖性凋亡。SGI-1776诱导CLL细胞凋亡,作用机理涉及Mcl-1减少。SGI-1776在体外,具有毒性,且平均相对IC50值为3.1 mM。SGI-1776除了Pim, 也有效靶向作用于FLT3 ,IC50 = 44 nM。SGI-1776诱导AML细胞凋亡,这种作用存在浓度依赖性。SGI-1776 作用于AML原代细胞,具有毒性,且导致Mcl-1蛋白降低。

Kinase Assays: Kinase inhibition is measured by the use of radiometric assays performed by KinaseProfiler service. Assays contain a peptide substrate, known purified recombinant human kinases, gamma-labeled ATP, magnesium ion, and a fixed concentration (1 μM) of SGI-1776. In a final reaction volume of 25 μL, 5 to 10 mU of Pim1/2/3 is incubated with 8 mM of MOPS, pH 7.0; 0.2 mM ethylene diamine tetraacetic acid; 100 μM KKRNRTLTV;10 mM MgAcetate; and [γ-32P-ATP] . The reaction is initiated by the addition of the MgATP mix. After incubation for 40 minutes at room temperature, the reaction is stopped by the addition of 5 μL of a 3% phosphoric acid solution. Then, 10 μL of the reaction is spotted onto a P30 filtermat and washed 3 times for 5 minutes in 75 mM phosphoric acid and once in methanol before it is dried and measured via a scintillation counter.

Cells are cultured in IMDM (ATCC) supplemented with 10% FBS and grown in a 37oC incubator with 5% CO2. Cells are routinely tested for Mycoplasma infection using a commercially available kit. Cells are treated with DMSO or various concentrations of SGI-1776 for 24 hours. Cells (1×106) are washed, then resuspended in 100 μL of annexin binding buffer, mixed with 5 μL of FITC solution and 5 μL of propidium iodide (PI; 50 μg/mL) solution. For each sample, 1×104 cells are measured using a Becton Dickinson FACSCalibur flow cytometer. (Only for Reference)