Differential requirement for irf8 in formation of embryonic and adult macrophages in zebrafish.

Differential requirement for irf8 in formation of embryonic and adult macrophages in zebrafish.
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DOI:
10.1371/journal.pone.0117513
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Talbot WS
Talbot WS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Shiau CE;Kaufman Z;Meireles AM;Talbot WS

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干扰素调节因子 8 (Irf8) 对于哺乳动物巨噬细胞发育和先天免疫至关重要,但其在硬骨鱼骨髓生成中的作用仍不完全清楚。特别是,缺乏分析 Irf8 在斑马鱼幼虫和成虫阶段巨噬细胞发育中的作用的遗传工具。我们使用 TALEN 介导的靶向在斑马鱼中生成了 irf8 无效突变体。我们的分析定义了irf8在不同阶段的不同要求。 irf8是原始和短暂的定性造血过程中所有巨噬细胞形成所必需的,但在受精后5-6天开始的成体阶段定性造血过程中不需要irf8。在早期阶段,irf8 突变体在表达 pu.1 的骨髓细胞中具有过量的中性粒细胞和过量的细胞死亡。在中性粒细胞和巨噬细胞谱系中表达野生型 irf8 后,irf8 突变体的巨噬细胞命运得到恢复,表明 irf8 调节巨噬细胞的规格和存活。在幼年irf8突变鱼中,存在成熟的巨噬细胞,但数量与野生型相比显着减少,表明胚胎发生后对irf8的持续需求。随着发育的进展,斑马鱼 irf8 突变体中的组织巨噬细胞变得明显,小胶质细胞可能除外。我们的研究明确了向成人造血系统转变之前和之后骨髓生成对 irf8 的不同要求。
Interferon regulatory factor 8 (Irf8) is critical for mammalian macrophage development and innate immunity, but its role in teleost myelopoiesis remains incompletely understood. In particular, genetic tools to analyze the role of Irf8 in zebrafish macrophage development at larval and adult stages are lacking. We generated irf8 null mutants in zebrafish using TALEN-mediated targeting. Our analysis defines different requirements for irf8 at different stages. irf8 is required for formation of all macrophages during primitive and transient definitive hematopoiesis, but not during adult-phase definitive hematopoiesis starting at 5-6 days postfertilization. At early stages, irf8 mutants have excess neutrophils and excess cell death in pu.1-expressing myeloid cells. Macrophage fates were recovered in irf8 mutants after wildtype irf8 expression in neutrophil and macrophage lineages, suggesting that irf8 regulates macrophage specification and survival. In juvenile irf8 mutant fish, mature macrophages are present, but at numbers significantly reduced compared to wildtype, indicating an ongoing requirement for irf8 after embryogenesis. As development progresses, tissue macrophages become apparent in zebrafish irf8 mutants, with the possible exception of microglia. Our study defines distinct requirement for irf8 in myelopoiesis before and after transition to the adult hematopoietic system.
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