Essential role of PU.1 in maintenance of mixed lineage leukemia-associated leukemic stem cells.

Essential role of PU.1 in maintenance of mixed lineage leukemia-associated leukemic stem cells.
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DOI:
10.1111/cas.12593
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发表时间:
2015-03
期刊:
影响因子:
5.7
通讯作者:
Kitabayashi I
Kitabayashi I
中科院分区:
医学2区
文献类型:
--
作者:
Aikawa Y;Yamagata K;Katsumoto T;Shima Y;Shino M;Stanley ER;Cleary ML;Akashi K;Tenen DG;Kitabayashi I

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急性骨髓性白血病是一种源自少量白血病干细胞(LSC)的克隆性恶性疾病。混合系白血病(MLL)基因重排在急性髓细胞白血病中发现,与预后不良相关。Hox基因的上调对于LSC的诱导和维持至关重要,但不太可能支持恶性肿瘤和在MLL白血病中观察到的高LSC频率。目前的研究表明,MLL融合蛋白与转录因子PU.1相互作用,激活CSF-1 R的转录,这对LSC活性至关重要。急性髓性白血病通过PU.1的缺失或表达CSF-1 R的细胞的消融而治愈。特异性针对CSF-1 R的激酶抑制剂可延长存活时间。这些发现表明PU.1介导的CSF-1 R上调是MLL白血病发生的关键效应子。
Acute myeloid leukemia is a clonal malignant disorder derived from a small number of leukemic stem cells (LSCs). Rearrangements of the mixed lineage leukemia (MLL) gene are found in acute myeloid leukemia associated with poor prognosis. The upregulation of Hox genes is critical for LSC induction and maintenance, but is unlikely to support malignancy and the high LSC frequency observed in MLL leukemias. The present study shows that MLL fusion proteins interact with the transcription factor PU.1 to activate the transcription of CSF-1R, which is critical for LSC activity. Acute myeloid leukemia is cured by either deletion of PU.1 or ablation of cells expressing CSF-1R. Kinase inhibitors specific for CSF-1R prolong survival time. These findings indicate that PU.1-mediated upregulation of CSF-1R is a critical effector of MLL leukemogenesis.
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