通过microRNA-22323调节原生细胞增殖和粒细胞功能
Jonathan B Johnnidis1, Marian H Harris, Robert T Wheeler
1Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA.
Nature
|February 19, 2008
概括
微RNA-223 (miR-223) 微调粒细胞的产生和炎症反应. 在小鼠中,miR-223的损失导致粒细胞扩张,炎症增加和组织损伤.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 遗传学 是一个遗传学.
背景情况:
- 微RNAs (miRNAs) 是基因表达的关键调节者,在哺乳动物中主要是未知的功能.
- 骨髓细胞特异性microRNA-223 (miR-223) 与骨髓细胞发育有关,但其确切作用尚不清楚.
研究的目的:
- 研究miR-223在骨髓原体发育和粒细胞生物学中的功能.
- 阐明miR-223调节颗粒形成和炎症的分子机制.
主要方法:
- 利用小鼠的功能丧失等位基因来研究miR-223的作用.
- 为了评估其影响,使用了Mef2c的基因切除,这是miR-223的标.
- 在野生型和miR-223突变小鼠中分析了粒细胞分化,激活和炎症反应.
主要成果:
- miR-223 缺乏导致由于原始细胞增多而扩大的粒细胞区.
- Mef2c被确定为miR-223的直接标;Mef2c的切除挽救了原始细胞的扩张.
- 缺乏miR-223的粒细胞表现出过度成熟,对激活过敏,以及增强的杀菌活性.
- 在受到内毒素挑战后,miR-223突变小鼠出现了自发的肺病理和过度的组织损伤.
结论:
- miR-223 作为粒细胞原始细胞增殖和分化的关键负调节剂.
- miR-223微调粒细胞激活,控制炎症反应,防止过度组织损伤.
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