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In vitro: BIBF 1120 binds to the ATP-binding site in the cleft between the amino and carboxy terminal lobes of the kinase domain. BIBF 1120 inhibits proliferation of PDGF-BB stimulated BRPs with EC50 of 79 nM in cell assays. BIBF1120 (100 nM) blocks activation of MAPK after stimulation with 5% serum plus PDGF-BB. BIBF1120 prevents PDGF-BB stimulated proliferation with an EC50 of 69 nM in cultures of human vascular smooth muscle cells (HUASMC).
In vivo: BIBF1120 (25-100 mg/kg daily p.o.) is highly active in all tumor models, including human tumor xenografts growing in nude mice and a syngeneic rat tumor model. This is evident in the magnetic resonance imaging of tumor perfusion after 3 days, reducing vessel density and vessel integrity after 5 days, and profound growth inhibition. BIBF1120 is orally available and displays encouraging efficacy in in vivo tumor models while being well tolerated.
| Cell Experiment | |
|---|---|
| Cell lines | HUVEC, HUASMC, and BRP cell lines |
| Preparation method | The cell lines HUVEC, HUASMC, and BRP are used for the assay. BIBF1120 is added to the cultures two hours before the addition of ligands. Cell lysates are generated. Western blotting is done using standard SDS-PAGE methods, loading 50 to 75 μg of protein per lane. Detection is facilitated by enhanced chemiluminescence. Total and phosphorylated mitogen-activated protein kinase (MAPK) is analyzed using monoclonal antibodies M3807 and M8159. Total Akt is detected using the corresponding polyclonal antibody and phosphorylated Akt (Ser473) is analyzed by using its monoclonal antibody. Monoclonal antibody is also used to detect cleaved caspase-3 while KDR (VEGFR2) protein is detected using a corresponding antibody. |
| Concentrations | 50 nM |
| Incubation time | 2 h |
| Animal Experiment | |
|---|---|
| Animal models | FaDu, Caki-1, SKOV-3, H460, HT-29, or PAC-120 xenografts in Athymic NMRI-nu/nu female mice |
| Formulation | In a 0.5 % Natrosol solution |
| Dosages | 100 mg/kg |
| Administration | p.o. |
| Molecular Weight | 649.76 |
| Formula | C33H39N5O7S |
| CAS Number | 656247-18-6 |
| Solubility (25°C) | DMSO 30 mg/mL Water 10 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
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