KRN 633

For research use only.

Catalog No.S1557

6 publications

KRN 633 Chemical Structure

CAS No. 286370-15-8

KRN 633 is an ATP-competitive inhibitor of VEGFR1/2/3 with IC50 of 170 nM/160 nM/125 nM, weakly inhibits PDGFR-α/β and c-Kit, does not block the phosphorylation of FGFR-1, EGFR or c-Met in cell.

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Selleck's KRN 633 has been cited by 6 publications

1 Customer Review

  • Inhibited migration of hNSCs toward HeLa cells with the treatment of KRN633, a VEGFR2 inhibitor. The cultured hNSCs were treated with KRN633 for 6 h. After that, the transwell migration assay was performed as described above. The number of migrated cells was counted and the results were presented as means ± SD. Magnification,× 200. *P < 0.05 vs. KRN633 non-treated GESTECs. (A) Migrated HB1.F3.CD cells. (B) Migrated HB1.F3.CD.IFN-β cells.

    Mol Cells, 2013, 36:347-354.. KRN 633 purchased from Selleck.

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Biological Activity

Description KRN 633 is an ATP-competitive inhibitor of VEGFR1/2/3 with IC50 of 170 nM/160 nM/125 nM, weakly inhibits PDGFR-α/β and c-Kit, does not block the phosphorylation of FGFR-1, EGFR or c-Met in cell.
VEGFR3 [1] VEGFR2 [1] VEGFR1 [1] PDGFRα [1] c-Kit [1]
125 nM 160 nM 170 nM 965 nM 4330 nM
In vitro

KRN 633, a novel quinazoline urea derivative, strongly inhibits VEGFR1, VEGFR2 and VEGFR3 receptors with IC50 values of 170 nM, 160 nM and 125 nM respectively. It shows lower inhibitory activity towards non-RTKs, such as PDGF receptor (PDGFRα and β, c-Kit, breast tumor kinase, and tunica interna endothelial cell kinase tyrosine kinases (IC50 = 965, 9850, 4330, 9200, and 9900 nM, respectively). KRN 633 potently inhibits ligand VEGF induced phosphorylation of VEGFR2 in HUVECs with an IC50 of 1.16 nM. KRN 633 also inhibits VEGF-dependent, but not bFGF-dependent, phosphorylation of the MAP kinases in endothelial cells, with IC50 values of 3.51 nM and 6.08 nM for ERK1 and ERK2, respectively. KRN633 has also been shown to inhibit the VEGF-driven proliferation of HUVECs with an IC50 of 14.9 nM, but it only suppresses FGF-driven proliferation at 3 μM weakly. [1] KRN 633 inhibits hypoxia-induced transcriptional activation of HIF-1α in a concentration-dependent manner with an IC50 of 3.79 μM, through the inhibition of both Akt and ERK phosphorylation signaling pathways. [2]

In vivo Although not cytotoxic to various cancer cells in vitro, KRN633 exhibits excellent antitumor activity in vivo due to its inhibitory effect on tumor vessel formation and vascular permeability. Once-daily administration of KRN633 at 100 mg/kg/d produces significant tumor growth inhibition in A549, LC-6-LCK, HT29, Ls174T, LNCap and Du145 cells while twice-daily administration of KRN633 at 100 mg/kg induces ~90% growth inhibition of HT29 tumors. [1] Treatment of mid-pregnancy mice with KRN 633 (300 mg/kg, p.o.) reduces the blood supply to fetal tissues due to diminished vascularization in both placenta and fetal organs and consequently increases the risk of induction of intrauterine growth restriction (IUGR). [3]


Kinase Assay:[1]
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Cell-Free Kinase Assays:

Cell-free kinase assays are done to obtain IC50 values against a variety of recombinant VEGF receptors. KRN633 is tested at concentrations varying from 0.3 nM to 10 μM. All assays are done in quadruplicate with 1 μM ATP.
Cell Research:[1]
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  • Cell lines: A549, Ls174T, DU145, HT29, LNCap and PC-3 cell lines
  • Concentrations: Dissolved in DMSO, final concentrations 0.01 to 10 μM
  • Incubation Time: 96 hours
  • Method: Cancer cells are plated in media containig 10% FBS and antibiotics, at densities known to permit exponential growth over the assay period. The cells are cultured for 24 hours before adding KRN633 (0.01 to 10 μM) or just the vehicle (0.1% DMSO in medium) and then grown for a further 96 hours. Cell viability is measured using WST-1 reagent.
    (Only for Reference)
Animal Research:[1]
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  • Animal Models: A549, Ls174T, HT29, DU145, LNCap, PC-3 cells and LC-6-JCK are established in athymic mice (BALB/cA, Jcl-nu) and athymic rats (F344/N, Jcl-rnu), respectively.
  • Dosages: 20-100 mg/kg
  • Administration: Gavage once daily
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 9 mg/mL (21.58 mM)
Water Insoluble
Ethanol Insoluble
In vivo Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
0.5% methylcellulose+0.2% Tween 80
For best results, use promptly after mixing.
10 mg/mL

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 416.86


CAS No. 286370-15-8
Storage powder
in solvent
Synonyms N/A
Smiles CCCNC(=O)NC1=C(C=C(C=C1)OC2=NC=NC3=CC(=C(C=C32)OC)OC)Cl

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID