Neutrophil stimulation with citrullinated histone H4 slows down calcium influx and reduces NET formation compared with native histone H4.

Neutrophil stimulation with citrullinated histone H4 slows down calcium influx and reduces NET formation compared with native histone H4.
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与天然组蛋白H4相比,用柠檬酸的组蛋白H4用瓜酮组蛋白H4刺激钙的流入并减少净形成。

DOI:
10.1371/journal.pone.0251726
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发表时间:
2021
期刊:
影响因子:
3.7
通讯作者:
Wagner DD
Wagner DD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Shi L;Aymonnier K;Wagner DD

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肽基精氨酸脱亚胺酶4(PAD4)通过将蛋白质精氨酸或单甲基精氨酸转化为瓜氨酸,催化多种靶蛋白的翻译后修饰。中性粒细胞胞外陷阱(Net)的形成是PAD4介导的中性粒细胞高瓜氨酸化反应最显著的表现,其特征是核染色质在细胞外空间释放,形成染色质网络。组蛋白H4是染色质的主要蛋白质成分之一,在脓毒症、创伤和缺血再灌注损伤过程中被释放到细胞外空间,在网络形成过程中也可以与其瓜氨酸形式一起释放。本研究表明,组蛋白H4能以钙和PAD4依赖的方式诱导网状结构的形成。组蛋白H4引起中性粒细胞膜的通透性和细胞内钙的持续升高,这是激活PAD4所必需的。相比之下,与天然形式相比,瓜氨酸组蛋白H4诱导的钙内流较少,导致净形成减少。这些研究表明,瓜氨酸组蛋白H4可以在NETS的病理中起到刹车的作用,减缓组蛋白H4和NETS之间的恶性循环。
Peptidylarginine deiminase 4 (PAD4) catalyzes posttranslational modification of many target proteins through converting protein arginine or mono-methylarginine to citrulline. Neutrophil extracellular trap (NET) formation is the most dramatic manifestation of PAD4-mediated hypercitrullination reaction in neutrophils, which is characterized by the release of nuclear chromatin to form a chromatin network in the extracellular space. Histones H4, one of the major protein components of chromatin, is released into the extracellular space during sepsis, trauma, and ischemia-reperfusion injury and can also be released during the process of NET formation, along with its citrullinated form. The present study showed that histone H4 can induce NET formation in a calcium and PAD4 dependent manner. Histone H4 caused permeabilization of the neutrophil membrane and sustained rise in intracellular calcium that is necessary for activation of PAD4. In comparison, citrullinated histone H4 induced less calcium influx compared with its native form, leading to reduced NET formation. These studies suggest that citrullinated histone H4 could serve as a brake in the pathology of NETs, slowing down the vicious circle between histone H4 and NETs.
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