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Hhex regulates murine lymphoid progenitor survival independently of Stat5 and Cdkn2a.
European Journal of Immunology ( IF 4.5 ) Pub Date : 2020-02-23 , DOI: 10.1002/eji.201948371
Jacob T Jackson 1 , Kristy O'Donnell 2 , Amanda Light 1 , Wilford Goh 1 , Nicholas D Huntington 1 , David M Tarlinton 2 , Matthew P McCormack 3
Affiliation  

The transcription factor Hhex (hematopoietically expressed homeobox gene) is critical for development of multiple lymphoid lineages beyond the common lymphoid progenitor. In addition, Hhex regulates hematopoietic stem cell (HSC) self‐renewal, emergency hematopoiesis, and acute myeloid leukemia initiation and maintenance. Hhex mediates its effects on HSCs and acute myeloid leukemia stem cells via repression of the Cdkn2a tumor suppressor locus. However, we report here that loss of Cdkn2a does not rescue the failure of lymphoid development caused by loss of Hhex. As loss of Hhex causes apoptosis of lymphoid progenitors associated with impaired Bcl2 expression and defective Stat5b signaling, we tested the effects of rescuing these pathways using transgenic mice. Expression of the anti‐apoptotic factor Bcl2, but not activated Stat5, rescued the development of T‐, B‐, and NK‐cell lineages in the absence of Hhex. These results indicate that Bcl2 expression, but not Stat5b signaling or loss of Cdkn2a, can overcome the lymphoid deficiencies caused by the absence of Hhex, suggesting that the primary role of this transcription factor is to promote survival of lymphoid progenitors during early lymphoid development.

中文翻译:

Hhex独立于Stat5和Cdkn2a调节鼠淋巴祖细胞的存活。

转录因子Hhex(造血表达同源异型盒基因)对于超出普通淋巴祖细胞的多种淋巴谱系的发育至关重要。此外,Hhex还调节造血干细胞(HSC)的自我更新,紧急造血功能以及急性髓细胞性白血病的发生和维持。Hhex通过抑制Cdkn2a介导其对HSC和急性髓性白血病干细胞的作用抑癌基因座。但是,我们在这里报告说,Cdkn2a的丢失不能挽救由于Hhex丢失引起的淋巴样发育失败。由于Hhex的丢失会导致与Bcl2表达受损和Stat5b信号传导缺陷相关的淋巴样祖细胞凋亡,因此我们使用转基因小鼠测试了拯救这些途径的效果。在没有Hhex的情况下,抗凋亡因子Bcl2的表达但未激活Stat5,可以挽救T细胞,B细胞和NK细胞谱系的发育。这些结果表明,Bcl2表达,但不是Stat5b信号传递或Cdkn2a缺失,可以克服由于缺少Hhex而引起的淋巴缺陷,这表明该转录因子的主要作用是在早期淋巴发育中促进淋巴祖细胞的存活。
更新日期:2020-02-23
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