The transcription factor PlagL2 activates Mpl transcription and signaling in hematopoietic progenitor and leukemia cells.

The transcription factor PlagL2 activates Mpl transcription and signaling in hematopoietic progenitor and leukemia cells.
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DOI:
10.1038/leu.2010.301
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发表时间:
2011-04
期刊:
影响因子:
11.4
通讯作者:
Castilla, L. H.
Castilla, L. H.
中科院分区:
医学1区
文献类型:
--
作者:
Landrette, S. F.;Madera, D.;He, F.;Castilla, L. H.

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细胞因子信号通路是急性髓性白血病致癌突变的常见靶点,促进增殖和存活。我们之前已经证明,转录因子PLAGL 2促进增殖,并与白血病融合蛋白Cbfβ-SMMHC在急性髓系白血病的发展中合作。在这里,我们表明PLAGL 2上调血小板生成素受体Mpl的表达,使用其近端启动子中的2个共有位点。我们还发现Mpl过表达与Cbfβ-SMMHC在小鼠白血病的发展中有效地协同作用。最后,我们证明了表达PlagL 2的白血病细胞对Tpo配体的反应显示出Jak 2和下游STAT 5、Akt和Erk 1/2通路的超活化。这些结果表明,PlagL 2表达激活造血祖细胞中Mpl的表达,并且野生型Mpl的上调与小鼠中CBFβ-SMMHC合作提供致癌信号。
Cytokine signaling pathways are frequent targets of oncogenic mutations in acute myeloid leukemia, promoting proliferation and survival. We have previously shown that the transcription factor PLAGL2 promotes proliferation and cooperates with the leukemia fusion protein Cbfβ-SMMHC in acute myeloid leukemia development. Here we show that PLAGL2 upregulates expression of the thrombopoietin receptor Mpl, using 2 consensus sites in its proximal promoter. We also show that Mpl overexpression efficiently cooperates with Cbfβ-SMMHC in development of leukemia in mice. Finally, we demonstrate that PlagL2-expressing leukemic cells show hyper-activation of Jak2 and downstream STAT5, Akt and Erk1/2 pathways in response to Tpo ligand. These results show that PlagL2 expression activates expression of Mpl in hematopoietic progenitors, and that upregulation of wild type Mpl provides an oncogenic signal in cooperation with CBFβ-SMMHC in mice.
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