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• W2023563217 endingPage "5729" @default.
• W2023563217 startingPage "5724" @default.
• W2023563217 abstract "Alterations of the epidermal growth factor receptor ( EGFR ) gene occur frequently in human malignant gliomas. The most common of these is deletion of exons 2–7, resulting in truncation of the extracellular domain (ΔEGFR or EGFRvIII), which occurs in a large fraction of de novo malignant gliomas (but not in progressive tumors or those lacking p53 function) and enhances tumorigenicity, in part by decreasing apoptosis through up-regulation of Bcl-X L . Here, we demonstrate that the ΔEGFR concomitantly confers resistance to the chemotherapeutic drug cisplatin (CDDP) by suppression of CDDP-induced apoptosis. Expression of Bcl-X L was elevated in U87MG.ΔEGFR cells prior to and during CDDP treatment, whereas it decreased considerably in CDDP-treated parental cells. CDDP-induced activation of caspase-3-like proteases was suppressed significantly in U87MG.ΔEGFR cells. These responses were highly specific to constitutively kinase-active ΔEGFR, because overexpression of kinase-deficient ΔEGFR (DK) or wild-type EGFR had no such effects. Correspondingly, ΔEGFR specific tyrosine kinase inhibitors reduced Bcl-X L expression and potentiated CDDP-induced apoptosis in U87MG.ΔEGFR cells. Ectopic overexpression of Bcl-X L in parental U87MG cells also resulted in suppression of both caspase activation and apoptosis induced by CDDP. These results may have important clinical implications for the use of CDDP in the treatment of those malignant gliomas expressing ΔEGFR." @default.
• W2023563217 created "2016-06-24" @default.
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• W2023563217 date "1998-05-12" @default.
• W2023563217 modified "2023-10-03" @default.
• W2023563217 title "Drug resistance of human glioblastoma cells conferred by a tumor-specific mutant epidermal growth factor receptor through modulation of Bcl-X _L and caspase-3-like proteases" @default.
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• W2023563217 doi "https://doi.org/10.1073/pnas.95.10.5724" @default.
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