Alas1 is essential for neutrophil maturation in zebrafish.

Alas1 is essential for neutrophil maturation in zebrafish.
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Alas1 对于斑马鱼中性粒细胞的成熟至关重要。

DOI:
10.3324/haematol.2018.194316
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发表时间:
2018-11
期刊:
影响因子:
10.1
通讯作者:
Zhang Y
Zhang Y
中科院分区:
医学1区
文献类型:
--
作者:
Lian J;Chen J;Wang K;Zhao L;Meng P;Yang L;Wei J;Ma N;Xu J;Zhang W;Zhang Y

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中性粒细胞在先天免疫中起着至关重要的作用,是杀死外来微生物的第一反应者,这一功能部分依赖于它们的颗粒含量。中性粒细胞发育和成熟的复杂调控网络在很大程度上仍不清楚。在这里,我们利用中性粒细胞缺乏的斑马鱼来鉴定Alas1,一种血红素生物合成途径酶,在中性粒细胞发育中的一个新的作用。我们发现Alas1基因缺失的斑马鱼表现出适当的中性粒细胞启动,但由于缺乏血红素,进一步的中性粒细胞成熟被阻止,脂质储存和颗粒形成不足,并失去对血红素依赖的颗粒蛋白活性。因此,缺乏Alas1的斑马鱼在受到大肠杆菌攻击时,杀菌能力减弱,炎症反应增强。这些发现证明了Alas1通过血红素在调节中性粒细胞成熟和生理功能中的重要作用。我们的研究提供了Alas1缺乏症的体内模型,并可能有助于评估与血红素相关的疾病的进展,以促进这些疾病的药物和治疗策略的开发。
Neutrophils play essential roles in innate immunity and are the first responders to kill foreign micro-organisms, a function that partially depends on their granule content. The complicated regulatory network of neutrophil development and maturation remains largely unknown. Here we utilized neutrophil-deficient zebrafish to identify a novel role of Alas1, a heme biosynthesis pathway enzyme, in neutrophil development. We showed that Alas1-deficient zebrafish exhibited proper neutrophil initiation, but further neutrophil maturation was blocked due to heme deficiency, with lipid storage and granule formation deficiencies, and loss of heme-dependent granule protein activities. Consequently, Alas1-deficient zebrafish showed impaired bactericidal ability and augmented inflammatory responses when challenged with Escherichia coli. These findings demonstrate the important role of Alas1 in regulating neutrophil maturation and physiological function through the heme. Our study provides an in vivo model of Alas1 deficiency and may be useful to evaluate the progression of heme-related disorders in order to facilitate the development of drugs and treatment strategies for these diseases.
斑马鱼肾素有助于宿主防御大肠杆菌感染
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