| In Vitro | In vitro activity: Axitinib could block the cellular autophosphorylation of VEGFR and VEGF-mediated endothelial cell viability, tube formation, and downstream signaling. Axitinib inhibits the proliferation of variable cell lines with IC50 of >10,000 nM (IGR-N91), 849 nM (IGR-NB8), 274 nM (SH-SY5Y) and 573 nM (non-VEGF stimulated HUVEC).
Kinase Assay: Porcine aorta endothelial (PAE) cells, which overexpress full-length VEGFR2, PDGFRβ, Kit, and NIH-3T3, which overexpress murine VEGFR2 (Flk-1) or PDGFRα, are generated. The 96-well plates are coated with 100 μL/well of 2.5 μg/mL anti-VEGFR2 antibody, 0.75 μg/mL anti-PDGFRβ antibody, 0.25 μg/mL anti-PDGFRα antibody, 0.5 μg/mL anti-KIT antibody, or 1.20 μg/mL anti-Flk-1 antibody to prepare ELISA capture plates. Then phosphorylation of RTK is measured by ELISA.
Cell Assay: Cells (HUVEC, SH-SY5Y, IGR-N91 and IGR-NB8 cells) are seeded in a 96-well plate at a density of 5 × 104 and cultured for 24 hours. Axitinib is added to the cells at concentrations ranging from 1 nM to 10 μM. Cell viability is measured after 72 hours by MTS tetrazolium substrate and IC50 values are calculated. |
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| In Vivo | Axitinib exhibits primary inhibition to orthotopically transplanted models such as M24met (melanoma), HCT-116 (colorectal cancer), and SN12C (renal cell carcinoma). Axitinib delays the tumor growth with 11.4 days compared to the controls (p.o. 30 mg/kg) and decreases the Mean Vessels Density (MVD) to 21, compared to 49 in controls, in IGR-N91 flank xenografts. Axitinib significantly inhibits growth and disrupts tumor microvasculature in BT474 breast cancer model at 10-100 mg/kg. Axitinib has shown single-agent activity in variable tumors, including renal cell carcinoma, thyroid cancer, non-small cell lung cancer, and melanoma. |
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