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InVivo RNAi Screening Identifies a Leukemia-Specific Dependence on Integrin Beta 3 Signaling

机译:InVivo RNAi筛选确定了对整合素β3信号传导的白血病特异性依赖性。

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We used an invivo small hairpin RNA (shRNA) screening approach to identify genes that are essential for MLL-AF9 acute myeloid leukemia (AML). We found that Integrin Beta 3 (Itgb3) is essential for murine leukemia cells invivo and for human leukemia cells in xenotransplantation studies. In leukemia cells, Itgb3 knockdown impaired homing, downregulated LSC transcriptional programs, and induced differentiation via the intracellular kinase Syk. In contrast, loss of Itgb3 in normal hematopoietic stem and progenitor cells did not affect engraftment, reconstitution, or differentiation. Finally, using an Itgb3 knockout mouse model, we confirmed that Itgb3 is dispensable for normal hematopoiesis but is required for leukemogenesis. Our results establish the significance of the Itgb3 signaling pathway as a potential therapeutic target in AML.
机译:我们使用了一种体内小发夹RNA(shRNA)筛选方法来鉴定对MLL-AF9急性髓细胞性白血病(AML)至关重要的基因。在异种移植研究中,我们发现整合素Beta 3(Itgb3)对于鼠白血病细胞的体内存活和人类白血病细胞必不可少。在白血病细胞中,Itgb3敲低会损害归巢,下调LSC转录程序并通过细胞内激酶Syk诱导分化。相反,正常造血干细胞和祖细胞中Itgb3的丢失不会影响移入,重构或分化。最后,使用Itgb3基因敲除小鼠模型,我们证实Itgb3对于正常的造血作用是不可缺少的,但对于白血病的形成是必需的。我们的结果确立了Itgb3信号通路作为AML中潜在治疗靶点的重要性。

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