Motesanib Diphosphate (AMG 706) is the orally bioavailable diphosphate salt of a multiple-receptor tyrosine kinase inhibitor with potential antineoplastic activity.

c-Kit:8 nM, VEGFR2/Flk1:6 nM, VEGFR1:2 nM, VEGFR3:6 nM, VEGFR2:3 nM

在大鼠角膜模型中,每天口服两次（ED50=2.1 mg/kg ）或一次（ED50=4.9 mg/kg ）Motesanib Diphosphate能够抑制血管内皮生长因子诱导的血管生成.在头部和颈部鳞状细胞癌移植瘤模型中,Motesanib Diphosphate和辐射治疗联用,显示出显著地抗癌活性.

在VEGF诱导的HUVECs细胞中（IC50 =10 nM）,Motesanib Diphosphate 明显抑制细胞增殖。对于血小板衍生因子诱导的增殖（IC50=207 nM）和SCF诱导的c-kit磷酸化（IC50=37 nM）,Motesanib Diphosphate能够显著抑制。人脐静脉内皮细胞,Motesanib Diphosphate增强细胞对于放射性的敏感程度。对人VEGFR家族,Motesanib Diphosphate具有广谱活性。

In vitro kinase assays: Optimal enzyme, ATP, and substrate (gastrin peptide) concentrations are established for each enzyme using homogeneous time-resolved fluorescence (HTRF) assays. Motesanib Diphosphate is tested in a 10-point dose-response curve for each enzyme using an ATP concentration of two-thirds Km for each. Most assays consist of enzyme mixed with kinase reaction buffer [20 mM Tris-HCl (pH 7.5), 10 mM MgCl2, 5 mM MnCl2, 100 mM NaCl, 1.5 mM EGTA]. A final concentration of 1 mM DTT, 0.2 mM NaVO4, and 20 μg/mL BSA is added before each assay. For all assays, 5.75 mg/mL streptavidin-allophycocyanin and 0.1125 nM Eu-PT66 are added immediately before the HTRF reaction. Plates are incubated for 30 minutes at room temperature and read on a Discovery instrument. IC50 values are calculated using the Levenberg-Marquardt algorithm into a four-parameter logistic equation.

Cells are preincubated for 2 hours with different concentrations of Motesanib Diphosphate, and exposed with 50 ng/mL VEGF or 20 ng/mL bFGF for an additional 72 hours. Cells are washed twice with DPBS, and plates are frozen at -70 °C for 24 hours. Proliferation is assessed by the addition of CyQuant dye, and plates are read on a Victor 1420 workstation. IC50 data are calculated using the Levenberg-Marquardt algorithm into a four-parameter logistic equatio(Only for Reference)