Long-lasting inhibition of EGFR autophosphorylation in A549 tumor cells by intracellular accumulation of non-covalent inhibitors
作者:Federica Vacondio、Caterina Carmi、Elena Galvani、Michele Bassi、Claudia Silva、Alessio Lodola、Silvia Rivara、Andrea Cavazzoni、Roberta R. Alfieri、Pier Giorgio Petronini、Marco Mor
DOI:10.1016/j.bmcl.2013.08.008
日期:2013.10
In the present study, a small set of reversible or irreversible 4-anilinoquinazoline EGFR inhibitors was tested in A549 cells at early (1 h) and late (8 h) time points after inhibitor removal from culture medium. A combination of assays was employed to explain the observed long-lasting inhibition of EGFR autophosphorylation. We found that EGFR inhibition at 8 h can be due, besides to the covalent interaction of the inhibitor with Cys797, as for PD168393 (2) and its prodrug 4, to the intracellular accumulation of non-covalent inhibitors by means of an active cell uptake, as for 5 and 6. Compounds 5-6 showed similar potency and duration of inhibition of EGFR autophosphorylation as the covalent inhibitor 2, while being devoid of reactive groups forming covalent bonds with protein thiols. (C) 2013 Elsevier Ltd. All rights reserved.