Department of Pediatrics, Shimane University School of Medicine, 89-1 Enya-Cho, Izumo, Shimane 693-8501, Japan.
J Oncol. 2011;2011:946936. doi: 10.1155/2011/946936. Epub 2010 Dec 23.
ITD-Flt3 mutations are detected in leukemia stem cells (LSCs) in acute myeloid leukemia (AML) patients. While antagonizing Survivin normalizes ITD-Flt3-induced acute leukemia, it also impairs hematopoietic stem cell (HSC) function, indicating that identification of differences in signaling pathways downstream of Survivin between LSC and HSC are crucial to develop selective Survivin-based therapeutic strategies for AML. Using a Survivin-deletion model, we identified 1,096 genes regulated by Survivin in ITD-Flt3-transformed c-kit(+), Sca-1(+), and lineage(neg) (KSL) cells, of which 137 are deregulated in human LSC. Of the 137, 124 genes were regulated by Survivin exclusively in ITD-Flt3(+) KSL cells but not in normal CD34(neg) KSL cells. Survivin-regulated genes in LSC connect through a network associated with the epidermal growth factor receptor signaling pathway and falls into various functional categories independent of effects on apoptosis. Pathways downstream of Survivin in LSC that are distinct from HSC can be potentially targeted for selective anti-LSC therapy.
ITD-Flt3 突变存在于急性髓系白血病(AML)患者的白血病干细胞(LSCs)中。拮抗 Survivin 可以使 ITD-Flt3 诱导的急性白血病正常化,但也会损害造血干细胞(HSC)的功能,这表明鉴定 Survivin 下游信号通路在 LSC 和 HSC 之间的差异对于开发针对 AML 的选择性 Survivin 为基础的治疗策略至关重要。我们使用 Survivin 缺失模型,鉴定了 1096 个在 ITD-Flt3 转化的 c-kit(+)、Sca-1(+)和谱系(neg)(KSL)细胞中受 Survivin 调节的基因,其中 137 个在人类 LSC 中失调。在 137 个基因中,有 124 个基因仅受 ITD-Flt3(+) KSL 细胞中的 Survivin 调节,而不受正常 CD34(neg) KSL 细胞的调节。LSC 中受 Survivin 调节的基因通过与表皮生长因子受体信号通路相关的网络连接,并分为各种与凋亡无关的功能类别。LSC 中与 HSC 不同的 Survivin 下游途径可能成为潜在的针对 LSC 的选择性治疗靶点。