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Recombinant OX40 attenuates neuronal apoptosis through OX40-OX40L/PI3K/AKT signaling pathway following subarachnoid hemorrhage in rats.
Experimental Neurology ( IF 4.6 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.expneurol.2020.113179
Ling-Yun Wu 1 , Budbazar Enkhjargal 2 , Zhi-Yi Xie 2 , Zachary D Travis 2 , Cheng-Mei Sun 2 , Ke-Ren Zhou 2 , Tong-Yu Zhang 2 , Qi-Quan Zhu 2 , Chun-Hua Hang 3 , John H Zhang 4
Affiliation  

Subarachnoid hemorrhage (SAH) is the most devastating form of stroke. Reducing neuronal apoptosis is an important countermeasure against early brain injury (EBI) after SAH. Recent evidence indicates that OX40-OX40L coupling is critical for cell survival and proliferation. Current study was performed to detect the role of recombinant OX40 (ReOX40) against neuronal apoptosis after SAH. The endovascular perforation model of SAH was performed on Sprague-Dawley (SD) rats. ReOX40 was injected intracerebroventricularly (i.c.v) 1 h after SAH induction and the following methods were employed: neurological function evaluation, immunofluorescence staining, fluoro-Jade C staining, and western blot. To study the underlying precise molecular mechanism, small interfering ribonucleic acid (siRNA) for OX40L and a specific inhibitor of PI3K, LY294002, were injected i.c.v. into SAH + ReOX40 rats before induction of SAH. When compared with sham rats, the expression of OX40 and OX40L was seen to decrease in the brain at 24 h after SAH induction. Administration of ReOX40 (5 μg/kg) increased expression of the OX40L, reduced the neuronal apoptosis, and improved short and long-term neurological function deficits. Furthermore, ReOx40 heightened activation of OX40L/PI3K/AKT axis, increased the downstream anti-apoptotic protein (Bcl2, Bcl-XL), and depressed the apoptotic protein (cleaved caspase 3, Bax). However, the protective effects of ReOX40 were abolished by the administration of OX40L siRNA and LY294002, respectively. These results demonstrate that ReOX40 attenuates neuronal apoptosis through OX40-OX40L/PI3K/AKT pathway in EBI after SAH.

中文翻译:

重组蛛网膜下腔出血后,OX40通过OX40-OX40L / PI3K / AKT信号通路减弱神经元凋亡。

蛛网膜下腔出血(SAH)是中风最破坏性的形式。减少神经元凋亡是SAH后早期脑损伤(EBI)的重要对策。最近的证据表明,OX40-OX40L偶联对于细胞存活和增殖至关重要。进行了当前的研究以检测重组OX40(ReOX40)对SAH后神经元凋亡的作用。在Sprague-Dawley(SD)大鼠上进行SAH的血管内穿孔模型。在SAH诱导后1 h内(icv)脑室内注射ReOX40,并采用以下方法:神经功能评估,免疫荧光染色,荧光Jade C染色和蛋白质印迹。为了研究潜在的精确分子机理,研究了OX40L的小分子干扰核糖核酸(siRNA)和PI3K的特异性抑制剂LY294002,在诱导SAH之前,先向icv注射SAH + ReOX40大鼠。与假手术大鼠相比,在SAH诱导后24小时,大脑中OX40和OX40L的表达下降。服用ReOX40(5μg/ kg)可增加OX40L的表达,减少神经元凋亡,并改善短期和长期神经功能缺损。此外,ReOx40增强了OX40L / PI3K / AKT轴的激活,增加了下游抗凋亡蛋白(Bcl2,Bcl-XL),并抑制了凋亡蛋白(裂解的半胱天冬酶3,Bax)。然而,分别通过施用OX40L siRNA和LY294002,消除了ReOX40的保护作用。这些结果表明,ReOX40通过SAH后EBI中的OX40-OX40L / PI3K / AKT途径减弱神经元凋亡。与假手术大鼠相比,在SAH诱导后24小时,大脑中OX40和OX40L的表达下降。服用ReOX40(5μg/ kg)可增加OX40L的表达,减少神经元凋亡,并改善短期和长期神经功能缺损。此外,ReOx40增强了OX40L / PI3K / AKT轴的激活,增加了下游抗凋亡蛋白(Bcl2,Bcl-XL),并抑制了凋亡蛋白(裂解的半胱天冬酶3,Bax)。然而,分别通过施用OX40L siRNA和LY294002,消除了ReOX40的保护作用。这些结果表明,ReOX40通过SAH后EBI中的OX40-OX40L / PI3K / AKT途径减弱神经元凋亡。与假手术大鼠相比,在SAH诱导后24小时,大脑中OX40和OX40L的表达下降。服用ReOX40(5μg/ kg)可增加OX40L的表达,减少神经元凋亡,并改善短期和长期神经功能缺损。此外,ReOx40增强了OX40L / PI3K / AKT轴的激活,增加了下游抗凋亡蛋白(Bcl2,Bcl-XL),并抑制了凋亡蛋白(裂解的半胱天冬酶3,Bax)。然而,分别通过施用OX40L siRNA和LY294002,消除了ReOX40的保护作用。这些结果表明,ReOX40通过SAH后EBI中的OX40-OX40L / PI3K / AKT途径减弱神经元凋亡。服用ReOX40(5μg/ kg)可增加OX40L的表达,减少神经元凋亡,并改善短期和长期神经功能缺损。此外,ReOx40增强了OX40L / PI3K / AKT轴的激活,增加了下游抗凋亡蛋白(Bcl2,Bcl-XL),并抑制了凋亡蛋白(裂解的半胱天冬酶3,Bax)。然而,分别通过施用OX40L siRNA和LY294002,消除了ReOX40的保护作用。这些结果表明,ReOX40通过SAH后EBI中的OX40-OX40L / PI3K / AKT途径减弱神经元凋亡。服用ReOX40(5μg/ kg)可增加OX40L的表达,减少神经元凋亡,并改善短期和长期神经功能缺损。此外,ReOx40增强了OX40L / PI3K / AKT轴的激活,增加了下游抗凋亡蛋白(Bcl2,Bcl-XL),并抑制了凋亡蛋白(裂解的半胱天冬酶3,Bax)。然而,分别通过施用OX40L siRNA和LY294002,消除了ReOX40的保护作用。这些结果表明,ReOX40通过SAH后EBI中的OX40-OX40L / PI3K / AKT途径减弱神经元凋亡。增加下游抗凋亡蛋白(Bcl2,Bcl-XL),并抑制凋亡蛋白(裂解的胱天蛋白酶3,Bax)。然而,分别通过施用OX40L siRNA和LY294002,消除了ReOX40的保护作用。这些结果表明,ReOX40通过SAH后EBI中的OX40-OX40L / PI3K / AKT途径减弱神经元凋亡。增加下游抗凋亡蛋白(Bcl2,Bcl-XL),并抑制凋亡蛋白(裂解的胱天蛋白酶3,Bax)。然而,分别通过施用OX40L siRNA和LY294002可以消除ReOX40的保护作用。这些结果表明,ReOX40通过SAH后EBI中的OX40-OX40L / PI3K / AKT途径减弱神经元凋亡。
更新日期:2020-01-11
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