Transgenic expression of HuR increases vasogenic edema and impedes functional recovery in rodent ischemic stroke.

Transgenic expression of HuR increases vasogenic edema and impedes functional recovery in rodent ischemic stroke.
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DOI:
10.1016/j.neulet.2017.09.062
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发表时间:
2017-11-20
影响因子:
2.5
通讯作者:
King PH
King PH
中科院分区:
医学4区
文献类型:
--
作者:
Ardelt AA;Carpenter RS;Iwuchukwu I;Zhang A;Lin W;Kosciuczuk E;Hinkson C;Rebeiz T;Reitz S;King PH

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缺血性中风具有显着的发病率和死亡率,而紧急干预措施受到治疗窗口短的限制。神经保护和神经修复的新方法是必要的。 HuR 是一种 RNA 结合蛋白 (RBP),可调节与缺血性中风损伤相关的基因的 RNA 稳定性和翻译效率。使用转基因 (Tg) 小鼠模型,我们研究了星形胶质细胞中异位 HuR 表达对短暂大脑中动脉闭塞 (tMCAO) 后急性损伤演变的影响。在病灶周围区域和对侧的星形胶质细胞中检测到 HuR 转基因表达。 HuR Tg 小鼠受伤后 72 小时神经功能没有改善,而同窝对照小鼠却有改善。在 Tg 小鼠中,观察到脑血管通透性增加和水肿。梗塞体积不受转基因存在的影响。星形胶质细胞中 HuR 的异位表达使小鼠短暂性缺血性中风后的结果恶化,部分原因是增加血管源性脑水肿。这些发现表明 HuR 可能是脑缺血/再灌注的治疗靶点。
Ischemic stroke produces significant morbidity and mortality, and acute interventions are limited by short therapeutic windows. Novel approaches to neuroprotection and neurorepair are necessary. HuR is an RNA binding protein (RBP) which modulates RNA stability and translational efficiency of genes linked to ischemic stroke injury. Using a transgenic (Tg) mouse model, we examined the impact of ectopic HuR expression in astrocytes on acute injury evolution after transient middle cerebral artery occlusion (tMCAO). HuR transgene expression was detected in astrocytes in perilesional regions and contralaterally. HuR Tg mice did not improve neurologically 72 hours after injury, whereas littermate controls did. In Tg mice, increased cerebral vascular permeability and edema were observed. Infarct volume was not affected by the presence of the transgene. Ectopic expression of HuR in astrocytes worsens outcome after transient ischemic stroke in mice in part by increasing vasogenic cerebral edema. These findings suggest that HuR could be a therapeutic target in cerebral ischemia/reperfusion.
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