Molecular Weight(MW): 238.28
Semaxanib (SU5416) is a potent and selective VEGFR(Flk-1/KDR) inhibitor with IC50 of 1.23 μM, 20-fold more selective for VEGFR than PDGFRβ, lack of activity against EGFR, InsR and FGFR. Phase 3.
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Injected tumor cells move to the tail via blood vessels. Tg (flil1:egfp) embryos at 20 hpf were treated with 2 μM SU5416 for 1 hr (+SU5416) to inhibit vasculogenesis24; the control fish were treated with 0.02% DMSO for 1 hr (-SU5416). After 1 hr, SU5416 or DMSO was washed out by changing fish media. At 48 hpf, tfRFP-B16 cells were injected into the pericardium cavity of fish. Representative images show that tumor cells moved to the tail in a drug-free larva, while no tumor cells moved to the tail in a drug-treated larva after new vessels were inhibited by SU5416. Insets are enlarged images from each corresponding tip of the tail indicated by white arrows. Dashed white lines mark extravasated tumor cells at 12 hpi. Vessels are green and tumor cells are red. –SU5416, 6 other larvae exhibit similar behaviors; +SU5416, 3 other larvae exhibit similar behaviors. Scale bars, 500 μm. Insets, 100 μm.
Sci Rep, 2016, 6:19304. . Semaxanib (SU5416) purchased from Selleck.
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|Description||Semaxanib (SU5416) is a potent and selective VEGFR(Flk-1/KDR) inhibitor with IC50 of 1.23 μM, 20-fold more selective for VEGFR than PDGFRβ, lack of activity against EGFR, InsR and FGFR. Phase 3.|
Semaxanib inhibits VEGF-dependent phosphorylation of the Flk-1 receptor in Flk-1-overexpressing NIH 3T3 cells with IC50 of 1.04 μM. Semaxanib inhibits PDGF-dependent autophosphorylation in NIH 3T3 cells with IC50 of 20.3 μM. Semaxanib inhibits VEGF- and FGF-driven mitogenesis in a dose-dependent manner with IC50 of 0.04 and 50 μM, respectively. Semaxanib treatment has no effect on the in vitro growth of C6 glioma, Calu 6 lung carcinoma, A375 melanoma, A431 epidermoid carcinoma, and SF767T glioma cells (all IC50s > 20 μM). 
|In vivo||Semaxanib dose-related inhibits growth of A375 tumor in vivo. A >85% inhibition of subcutaneous tumor growth is observed with daily i.p. administration of SU5416 in DMSO at Semaxanib, without measurable toxicity. Semaxanib shows broad spectrum antitumor activity. SU5416 significantly inhibits the subcutaneous growth of 8 of 10 tumor lines tested (A431, Calu-6, C6, LNCAP, EPH4-VEGF, 3T3HER2, 488G2M2 and SF763T cells) with an average mortality rate of 2.5%.  Semaxanib (25 mg/kg/day) displays potent antiangiogenic activity, resulting in a significant reduction of both the total and functional vascular density of the tumor microvasculature. |
Biochemical kinase assays:Solubilized membranes from 3T3 Flk-1 cells are added to polystyrene ELISA plates that had been precoated with a monoclonal antibody that recognizes Flk-1. After an overnight incubation with lysate at 4 ℃, serial dilutions of SU5416 are added to the immunolocalized receptor. To induce autophosphorylation of the receptor, various concentrations of ATP are added to the ELISA plate wells containing serially diluted solutions of SU5416. The autophosphorylation is allowed to proceed for 60 min at room temperature and then stopped with EDTA. The amount of phosphotyrosine present on the Flk-1 receptors in the individual wells is determined by incubating the immunolocalized receptor with a biotinylated monoclonal antibody directed against phosphotyrosine. After removal of the unbound anti-phosphotyrosine antibody, avidin-conjugated horseradish pero-idase H is added to the wells. A stabilized form of 3,3 9,5,5 9-tetramethyl benzidine dihydrochloride and H2O2 is added to the wells. The color readout of the assay is allowed to develop for 30 min, and the reaction is stopped with H2SO4.
|In vitro||DMSO||22 mg/mL (92.32 mM)|
|Ethanol||2 mg/mL (8.39 mM)|
|In vivo||1% DMSO+30% polyethylene glycol+1% Tween 80||30 mg/mL|
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Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT00026377||Completed||Prostate Cancer||University of Chicago|National Cancer Institute (NCI)||November 2001||Phase 1|
|NCT00023738||Completed||Sarcoma||Radiation Therapy Oncology Group|National Cancer Institute (NCI)||August 2001||Phase 1|Phase 2|
|NCT00023725||Completed||Sarcoma||Radiation Therapy Oncology Group|National Cancer Institute (NCI)||August 2001||Phase 1|Phase 2|
|NCT00017316||Completed||Melanoma (Skin)||National Cancer Institute (NCI)||March 2001||Phase 2|
|NCT00009919||Terminated||Recurrent Renal Cell Cancer|Stage IV Renal Cell Cancer||National Cancer Institute (NCI)||December 2000||Phase 2|
|NCT00006361||Completed||Carcinoma of Unknown Primary|Head and Neck Cancer|Non-melanomatous Skin Cancer||Memorial Sloan Kettering Cancer Center|National Cancer Institute (NCI)||December 2000||Phase 2|
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