In vitro activity: BFH772 was highly effective at targeting VEGFR2 kinase with an IC50 value of 3 nM, however, lost 500-fold potency on FLK-1, FLT-1, and FLT-4. BFH772 was highly selective, In addition to VEGFR2, it also targeted B-RAF, RET, and TIE-2, albeit with at least 40-fold lower potency. BFH772 inhibits the ligand induced autophosphorylation of RET, PDGFR, and KIT kinases, with IC50 values ranging between 30 and 160 nM.

Kinase Assay: BFH772 is highly selective; apart from inhibiting VEGFR2 at 3 nM IC50, it also targets B-RAF, RET, and TIE-2, albeit with at least 40-fold lower potency. BFH772 is inactive (IC50>10 μM;>2 μM for cKIT) against all other tyrosine specific- and serine/threonine-specific protein kinases tested. BFH772 inhibits VEGFR2 with IC50 of 4.6±0.6 nM in CHO cells. BFH772 inhibits VEGFR2 with IC50 of 3 nM in HUVEC cells. BFH772 inhibits the ligand induced autophosphorylation of RET, PDGFR, and KIT kinases, with IC50 values ranging between 30 and 160 nM. BFH772 is selective (IC50 values>0.5 μM) against the kinases of EGFR, ERBB2, INS-R, and IGF-1R and against the cytoplasmic BCR-ABL kinase. IC50 of BFH772 (<0.01 nM, n=2) demonstrates that they abrogated VEGF induced proliferation at remarkably low nM concentrations.

Cell Assay: Subconfluent HUVECs were incubated in triplicate in 96-well plates with basal medium containing 1.5% FCS and a constant concentration of VEGF (10 ng/mL), bFGF (0.5 ng/mL), or FCS (5%) in the presence or absence of compounds. After 24 h of incubation, BrdUrd labeling solution was added and cells incubated an additional 24 h before fixation, blocking, and addition of peroxidaselabeled anti-BrdUrd antibody. Bound antibody was then detected spectrophotometrically at 450 nm.

J Med Chem. 2016 Jan 14;59(1):132-46.