Novel function of FAXDC2 in megakaryopoiesis.

Novel function of FAXDC2 in megakaryopoiesis.
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FAXDC2 在巨核细胞生成中的新功能。

DOI:
10.1038/bcj.2016.87
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发表时间:
2016-09-30
影响因子:
12.8
通讯作者:
Huang Z
Huang Z
中科院分区:
医学1区
文献类型:
--
作者:
Jin Q;Ren Y;Wang M;Suraneni PK;Li D;Crispino JD;Fan J;Huang Z

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FAXDC 2(fatty acid hydroxylase domain containing 2)是脂肪酸羟化酶超家族的成员。鉴于脂肪酸在巨核细胞中的重要作用,我们研究了该基因在该谱系发育中的作用。在这里,我们发现FAXDC 2的表达在巨核细胞成熟过程中不断升高。相反,FAXDC 2在急性髓细胞白血病和急性巨核细胞白血病中显著下调。此外,FAXDC 2过表达促进巨核细胞系和原代细胞的分化,而其敲低则破坏它们的成熟。机制研究表明,FAXDC 2过表达增强了细胞外信号调节激酶(ERK)信号,并增加了RUNX 1(Runt-related transcription factor 1)的表达。FAXDC 2还恢复暴露于ERK抑制剂的细胞或表达RUNX 1显性阴性形式的细胞中的巨核细胞分化。最后,FAXDC 2过表达导致鞘脂GM 3合酶增加,表明FAXDC 2在脂质代谢中的潜在作用,其增加ERK信号传导并促进巨核细胞分化。总之,这些结果表明FAXDC 2在巨核细胞的发育中起着新的作用,其失调可能导致白血病中造血细胞发育异常。
FAXDC2 (fatty acid hydroxylase domain containing 2) is a member of the fatty acid hydroxylase superfamily. Given the important role of fatty acids in megakaryocytes, we have studied the role of this gene in the development of this lineage. Here we show that the expression of FAXDC2 is constantly elevated during megakaryocyte maturation. In contrast, FAXDC2 is significantly downregulated in acute myeloid leukemia and acute megakaryoblastic leukemia. Moreover, FAXDC2 overexpression promotes the differentiation of megakaryocytic cell lines and primary cells, whereas its knockdown disrupts their maturation. Mechanism study shows that FAXDC2 overexpression enhances extracellular signal-regulated kinase (ERK) signaling and increases RUNX1 (Runt-related transcription factor 1) expression. FAXDC2 also restores megakaryocytic differentiation in cells exposed to an ERK inhibitor or those expressing a dominant negative form of RUNX1. Finally, FAXDC2 overexpression leads to an increase in sphingolipid GM3 synthase, suggesting a potential role of FAXDC2 in lipid metabolism that increases ERK signaling and facilitates megakaryocyte differentiation. Together, these results show that FAXDC2 plays a novel role in development of megakaryocytes and its dysregulation may contribute to abnormal hematopoietic cell development in leukemia.
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