The voltage-gated proton channel Hv1 enhances brain damage from ischemic stroke.

The voltage-gated proton channel Hv1 enhances brain damage from ischemic stroke.
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DOI:
10.1038/nn.3059
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发表时间:
2012-03-04
影响因子:
25
通讯作者:
--
中科院分区:
医学1区
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吞噬细胞NADPH氧化酶(NOX)产生活性氧(ROS)作为先天免疫的一部分。不幸的是,缺血也可以诱导这一途径,并对天然细胞造成损害。在这里,我们表明,氮氧化物介导的损害可以通过抑制电压门控质子通道,Hv1抑制。Hv1是完全NOX活性所必需的,因为它补偿NOX输出电荷的损失。我们表明,Hv1是需要在原位和体内脑小胶质细胞中的NOX依赖性ROS的产生。小鼠和人脑小胶质细胞,但不是神经元或星形胶质细胞,表达大的Hv1介导的电流。缺乏Hv1的小鼠在中风后24小时免受NOX介导的神经元死亡和脑损伤。这些结果表明,Hv1依赖性ROS的产生是负责缺血性卒中后早期时间点的脑损伤的一个显着的分数,并提供了一个理由Hv1作为治疗缺血性卒中的治疗靶点。
Phagocytic cell NADPH oxidase (NOX) generates reactive oxygen species (ROS) as part of innate immunity. Unfortunately, ischemia can also induce this pathway and inflict damage on native cells. Here we show that NOX–mediated damage can be inhibited by suppression of the voltage-gated proton channel, Hv1. Hv1 is required for full NOX activity since it compensates for loss of NOX–exported charge. We show that Hv1 is required for NOX–dependent ROS generation in brain microglia in situ and in vivo. Mouse and human brain microglia, but not neurons or astrocytes, express large Hv1-mediated currents. Mice lacking Hv1 were protected from NOX–mediated neuronal death and brain damage 24 hours after stroke. These results demonstrate that Hv1–dependent ROS production is responsible for a significant fraction of brain damage at early time points after ischemic stroke and provide a rationale for Hv1 as a therapeutic target for the treatment of ischemic stroke.
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