CP-724714

FRE-erbB2 BT-474, MDA-MB-453, MDA-MB-231, LoVo (colon), and Colo-205 (colon) xenografts are established in athymic female mice (CD-1 nu/nu).

(E)-2-methoxy-N-(3-(4-(3-methyl-4-(6-methylpyridin-3-yloxy)phenylamino)quinazolin-6-yl)allyl)acetamide

0.1 nM - 10 uM.

ca.100 mg/kg.

10 nM, 10 nM, 10 nM, 10 nM, 10 nM, 10 nM

CP-724, 714 (25 mg/kg) is rapidly absorbed after p.o. administration and causes reduction of tumor erbB2 receptor phosphorylation after dosing in FRE-erbB2 or BT-474 xenografts. CP-724, 714 induces apoptosis in FRE-erbB2 xenograft–bearing (s.c.) mice and shows 50% tumor growth inhibition at 50 mg/kg, without weight loss or mortality. CP-724, 714 also has great antitumor activity in MDA-MB-453, MDA-MB-231, LoVo (colon), and Colo-205 (colon) xenografts. Furthermore, CP-724, 714 (30 or 100 mg/kg) reduces the extracellular signal–regulated kinase and Akt phosphorylation in BT-474 xenografts. [1]

Kinase assays, Recombinant erbB2 (amino acid residues 675-1255) and EGFR (amino acid residues 668-1211) intracellular domains are expressed in baculovirus-infected Sf9 cells as glutathione S-transferase fusion proteins. The proteins are purified by affinity chromatography on glutathione Sepharose beads for use in the assay. Nunc MaxiSorp 96-well plates are coated by incubation overnight at 37 C with 100 uL/well of 0.25 mg/mL poly(Glu:Tyr, 4:1), PGT in PBS. Excess PGT is removed by aspiration and the plate is washed 3 times with wash buffer (0.1% Tween 20 in PBS). The kinase reaction is performed in 50 uL of 50 mm HEPES (pH 7.4) containing 125 mm sodium chloride, 10 mm magnesium chloride, 0.1 mm sodium orthovanadate, 1 mm ATP, and 15 ng of recombinant protein. Inhibitors in DMSO are added, the final DMSO concentration is 2.5%. Phosphorylation is initiated by addition of ATP and proceeded for 6 min at room temperature, with constant shaking. The kinase reaction is terminated by aspiration of the reaction mixture and washing four times with wash buffer. Phosphorylated PGT is measured after a 25-min incubation with 50 uL/well HRP conjugated-PY54 antiphosphotyrosine antibody, diluted to 0.2 ug/mL in blocking buffer (3% BSA, 0.05% Tween 20 in PBS). Antibody is removed by aspiration and the plate is washed four times with wash buffer. The colorimetric signal is developed by addition of 50 uL/well Tetramethylbenzidine Microwell Peroxidase Substrate and stopped by the addition of 50 uL/well 0.09 m sulfuric acid. The phosphotyrosine product formed is estimated by measurement of absorbance at 450 nm. The signal for controls is typically A0.6–1.2, with essentially no background in wells without ATP, kinase protein, or PGT, and is proportional to the time of incubation for 6 min.

469, 53

, , Reto Baumann from ETH Zurich, CP-724714purchased from Selleck, After starved in primary serum, rat Schwann cells was stimulated for 15 minutes with a soluble form of neuregulin 1 type III to activate ErbB2. Activity of ErbB2 was determined by phosphorylation on Tyr1248. CP-724714 was applied at different concentrations, but achieved strong RTK inhibition already at very low concentrations.

DMSO 94 mg/mL, Water <1 mg/mL, Ethanol 94 mg/mL