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• W1979456024 abstract "Phosphatidylinositol-3-kinase pathway is constitutively activated in chronic lymphocytic leukemia mainly due to microenvironment signals, including stromal cell interaction and CXCR4 and B-cell receptor activation. Because of the importance of phosphatidylinositol-3-kinase signaling in chronic lymphocytic leukemia, we investigated the activity of the NVP-BKM120, an orally available pan class I phosphatidylinositol-3-kinase inhibitor. Sensitivity to NVP-BKM120 was analyzed in chronic lymphocytic leukemia primary samples in the context of B-cell receptor and microenvironment stimulation. NVP-BKM120 promoted mitochondrial apoptosis in most primary cells independently of common prognostic markers. NVP-BKM120 activity induced the blockage of phosphatidylinositol-3-kinase signaling, decreased Akt and FoxO3a phosphorylation leading to concomitant Mcl-1 downregulation and Bim induction. Accordingly, selective knockdown of BIM rescued cells from NVP-BKM120-induced apoptosis, while the kinase inhibitor synergistically enhanced the apoptosis induced by the BH3-mimetic ABT-263. We also found NVP-BKM120 to inhibit B-cell receptor- and stroma-dependent Akt pathway activation, thus sensitizing chronic lymphocytic leukemia cells to bendamustine and fludarabine. Furthermore, NVP-BKM120 down-regulated secretion of chemokines after B-cell receptor stimulation and inhibited cell chemotaxis and actin polymerization upon CXCR4 triggering by CXCL12. Our findings establish that NVP-BKM120 effectively inhibits the phosphatidylinositol-3-kinase signaling pathway and disturbs the protective effect of the tumor microenvironment with the subsequent apoptosis induction through the Akt/FoxO3a/Bim axis. We provide here a strong rationale for undertaking clinical trials of NVP-BKM120 in chronic lymphocytic leukemia patients alone or in combination therapies." @default.
• W1979456024 created "2016-06-24" @default.
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• W1979456024 date "2013-07-12" @default.
• W1979456024 modified "2023-10-09" @default.
• W1979456024 title "The phosphatidylinositol-3-kinase inhibitor NVP-BKM120 overcomes resistance signals derived from microenvironment by regulating the Akt/FoxO3a/Bim axis in chronic lymphocytic leukemia cells" @default.
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• W1979456024 doi "https://doi.org/10.3324/haematol.2013.088849" @default.
• W1979456024 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3815175" @default.
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