生物活性 | |||
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描述 | EGFR (epidermal growth factor receptor) family consists of four members that belong to the ErbB lineage of proteins (ErbB1–4) with an external domain that binds activating ligands, such as EGF, and is overexpressed in a significant percentage of carcinomas and contributes to the malignant phenotype. Upon activation, EGFR phosphorylates both the receptor itself and a variety of “effector” protein. Afatinib Dimaleate is the dimaleate form of Afatinib. Afatinib is an irreversible inhibitor of pan-ErbB inhibitor with IC50 values of 0.4nM, 0.5nM, 10nM, 14nM and 1nM for EGFR (L858R), EGFR (wt), EGFR (L858R/T790M), HER2 (measured by cell-free in vitro kinase assays) and ErbB4, respectively. Afatinib displays potent cellular effects on both EGFR and HER2 phosphorylation in cell lines with the in vitro kinase results, as well as anchorage-independent proliferation in NIH-3T3 cells ectopically expressing EGFR mutants. Afatinib inhibited survival of human NSCLC cell lines expressing HER2 776insV (NCI-H1781) or EGFR E746_A750del (HCC827), but showed no activity toward A549 cells, which expressed wild-type EGFR and HER2, but simultaneously harboring an oncogenic Kras G12S point mutation. Daily oral treatment with Afatinib at dose of 20mg/kg for 25 days resulted in dramatic tumor regression and downregulation of EGFR and AKT phosphorylation in A431 cells xenografted models. Also the tumor regression by Afatinib can be observed in NCI-N87 cells and H1975 cells xenografted animals. |
实验方案 | |||
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1mg | 5mg | 10mg | |
1 mM 5 mM 10 mM |
1.39mL 0.28mL 0.14mL |
6.96mL 1.39mL 0.70mL |
13.93mL 2.79mL 1.39mL |
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