Depletion of STAT5 blocks TEL–SYK-induced APMF-type leukemia with myelofibrosis and myelodysplasia in mice

Depletion of STAT5 blocks TEL–SYK-induced APMF-type leukemia with myelofibrosis and myelodysplasia in mice
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STAT5 的缺失可阻断 TELâSYK 诱导的小鼠 APMF 型白血病伴骨髓纤维化和骨髓增生异常

DOI:
10.1038/bcj.2014.53
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发表时间:
2014
影响因子:
12.8
通讯作者:
Dierks C
Dierks C
中科院分区:
医学1区
文献类型:
--
作者:
Sprissler C;Belenki D;Maurer H;Aumann K;Pfeifer D;Klein C;Müller TA;Hülsdünker J;Alexandrowski J;Brummer T;Jumaa H;Duyster J;Dierks C

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脾酪氨酸激酶 (SYK) 被确定为多种血液恶性肿瘤的致癌驱动因素。三种含有癌基因 SYK、SYK wt、TEL-SYK 和 IL-2 诱导型 T 细胞激酶 (ITK)-SYK 的体内比较揭示了普遍的骨髓扩张和三种不同血液学(前)疾病的建立。 SYK wt 增强了骨髓细胞和 T 细胞区室,而没有发生白血病/淋巴瘤。 ITK-SYK 引起致死性 T 细胞淋巴瘤,细胞质 TEL-SYK 融合诱导急性全骨髓病伴骨髓纤维化型急性髓性白血病 (AML),其中高达 50% 的未成熟巨核细胞浸润骨髓、脾脏和肝脏,另外还有 MPN 特征(骨髓纤维化和粒细胞扩张)以及伴有巨核细胞和红细胞的 MDS 特征发育不良。 LKS 细胞减少,所有亚群 (LT/ST/MPP) 的增殖率均降低。 SYK抑制剂(R788)对患病TEL-SYK小鼠进行治疗可减少白细胞增多、脾脏和肝脏浸润,增强血细胞比容并延长生存时间,但不能显着减少骨髓纤维化。在体外和体内,Stat5 被确定为 TEL-SYK 的主要下游介质。因此,体内定向删除 Stat5 完全消除了 TEL–SYK 诱导的 AML 和骨髓纤维化发展,证明 Stat5 是 SYK 诱导转化的主要驱动因素。我们的实验强调了 SYK 在 AML 和骨髓纤维化中的重要作用,并证明 SYK 和 STAT5 抑制剂是这些疾病的有效治疗选择。
The spleen tyrosine kinase (SYK) was identified as an oncogenic driver in a broad spectrum of hematologic malignancies. The in vivo comparison of three SYK containing oncogenes, SYK wt, TEL–SYK and IL-2-inducible T-cell kinase (ITK)-SYK revealed a general myeloexpansion and the establishment of three different hematologic (pre) diseases. SYK wt enhanced the myeloid and T-cell compartment, without leukemia/lymphoma development. ITK–SYK caused lethal T-cell lymphomas and the cytoplasmic TEL–SYK fusion induced an acute panmyelosis with myelofibrosis-type acute myeloid leukemia (AML) with up to 50% immature megakaryoblasts infiltrating bone marrow, spleen and liver, additional MPN features (myelofibrosis and granulocyte expansion) and MDS stigmata with megakaryocytic and erythroid dysplasia. LKS cells were reduced and all subsets (LT/ST/MPP) showed reduced proliferation rates. SYK inhibitor treatment (R788) of diseased TEL–SYK mice reduced leukocytosis, spleen and liver infiltration, enhanced the hematocrit and prolonged survival time, but could not significantly reduce myelofibrosis. Stat5 was identified as a major downstream mediator of TEL–SYK in vitro as well as in vivo. Consequently, targeted deletion of Stat5 in vivo completely abrogated TEL–SYK-induced AML and myelofibrosis development, proving Stat5 as a major driver of SYK-induced transformation. Our experiments highlight the important role of SYK in AML and myelofibrosis and prove SYK and STAT5 inhibitors as potent treatment options for those diseases.
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