Home Protein Tyrosine Kinase VEGFR inhibitor KRN 633

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KRN 633 VEGFR inhibitor

Cat.No.S1557

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.
KRN 633 VEGFR inhibitor Chemical Structure

Chemical Structure

Molecular Weight: 416.86

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Chemical Information, Storage & Stability

Molecular Weight 416.86 Formula

C20H21ClN4O4

 Storage (From the date of receipt)
CAS No. 286370-15-8 Download SDF Storage of Stock Solutions

Synonyms N/A Smiles CCCNC(=O)NC1=C(C=C(C=C1)OC2=NC=NC3=CC(=C(C=C32)OC)OC)Cl

Solubility

In vitro
Batch:

DMSO : 9 mg/mL (21.58 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : Insoluble

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Mass Concentration Volume Molecular Weight

In vivo
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Mechanism of Action

Targets/IC50/Ki
VEGFR3 [1]
125 nM
VEGFR2 [1]
160 nM
VEGFR1 [1]
170 nM
PDGFRα [1]
965 nM
c-Kit [1]
4330 nM
BTK [1]
9200 nM
PDGFRβ [1]
9850 nM
Tie-2 [1]
9900 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). This compound potently inhibits ligand VEGF induced phosphorylation of VEGFR2 in HUVECs with an IC50 of 1.16 nM. It 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. This chemical 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] It 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]
Kinase Assay
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.
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 this compound 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 this compound at 100 mg/kg induces ~90% growth inhibition of HT29 tumors. [1] Treatment of mid-pregnancy mice with this chemical (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]
References

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