Blood:NADPH氧化酶通过巨噬细胞调控清除凋亡的中性粒细胞

2018-04-05 MedSci MedSci原创

吞噬细胞的NADPH氧化酶可催化产生过氧化物,过氧化物是活性氧(ROS)的前体,而ROS具有抗菌和免疫调节功能。NADPH氧化酶等位基因的失活突变可引起慢性肉芽肿病(CGD),CGD的特点是对危及生命的微生物感染和炎性疾病的易感性增强,此外,NADPH氧化酶的亚等位基因与自身免疫相关。凋亡细胞(AC)的清除受损被认为是导致慢性炎症和自身免疫性疾病的重要因素,但NADPH氧化酶所驱动的ROS在该过程

吞噬细胞的NADPH氧化酶可催化产生过氧化物,过氧化物是活性氧(ROS)的前体,而ROS具有抗菌和免疫调节功能。NADPH氧化酶等位基因的失活突变可引起慢性肉芽肿病(CGD),CGD的特点是对危及生命的微生物感染和炎性疾病的易感性增强,此外,NADPH氧化酶的亚等位基因与自身免疫相关。

凋亡细胞(AC)的清除受损被认为是导致慢性炎症和自身免疫性疾病的重要因素,但NADPH氧化酶所驱动的ROS在该过程中的作用尚未完全明了。

现Juhi Bagaitkar等人发现在小鼠腹膜渗出液的巨噬细胞(PEM)中,AC(胞葬作用)的吞噬作用可显着激活NADPH氧化酶。ROS的产生依赖于巨噬细胞CD11b、TLR2、TLR4和MyD88,同时还受与p40phox氧化酶亚基结合的磷脂酰肌醇3-磷酸盐调控。在CGD PEM中,含有凋亡中性粒细胞的凋亡小体的成熟明显延迟,包括酸化作用和蛋白水解活性的获得,这些与凋亡中性蛋白的消化速度变慢相关。

利用空泡型H+ATPase抑制剂巴弗洛霉素治疗WT 巨噬细胞也可延缓效应体内的蛋白酶水解,提示腔内酸化作用对效应体内蛋白质的有效消化至关重要。最后,CGD PEM通过AC相关抗体与CD8 T细胞的相互交联增多。

总而言之,本研究揭示了NADPH氧化酶在炎性巨噬细胞处理凋亡细胞的过程中的关键作用;该过程产生的氧化剂促进效应体成熟和酸化作用,进而促进吞噬的凋亡细胞的降解。

原始出处:

Juhi Bagaitkar,et al.NADPH oxidase activation regulates apoptotic neutrophil clearance by murine macrophages. Blood  2018  :blood-2017-09-809004;  doi: https://doi.org/10.1182/blood-2017-09-809004

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    2018-04-07 pandamao2016
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    2018-04-05 happsf

    学习

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    2018-04-05 1ddf0692m34(暂无匿称)

    学习了.长知识

    0

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