Cell Host Microbe:埃博拉如何阻止人体免疫反应?

2014-08-20 koo 生物360

西非暴发的埃博拉病毒疫情,把全世界的目光都集中到了这种致命病毒身上。根据世界卫生组织的报告,在埃博拉病毒感染者中,死亡率最高可达到90%以上。8月13日,研究者在细胞出版社的《细胞宿主与微生物》(Cell Host & Microbe)期刊上发表了一项重大研究成果,告诉我们埃博拉病毒是如何阻止人体免疫系统做出正常反应的。理解埃博拉病毒对人体防御机制的影响,对于新疗法研发来说也将成为关键。美

西非暴发的埃博拉病毒疫情,把全世界的目光都集中到了这种致命病毒身上。根据世界卫生组织的报告,在埃博拉病毒感染者中,死亡率最高可达到90%以上。8月13日,研究者在细胞出版社的《细胞宿主与微生物》(Cell Host & Microbe)期刊上发表了一项重大研究成果,告诉我们埃博拉病毒是如何阻止人体免疫系统做出正常反应的。理解埃博拉病毒对人体防御机制的影响,对于新疗法研发来说也将成为关键。




美国华盛顿大学医学院的盖亚·阿马拉辛赫(Gaya Amarasinghe)博士等人,与西奈山伊坎医学院(Icahn School of Medicine)和达拉斯德州大学西南医学中心(UT Southwestern Medical Center)的学者通力合作,终于发现了埃博拉蛋白“VP24”对细胞免疫反应的干扰机制——这是埃博拉早期发展过程中的一个关键步骤。

“我们以前就知道,埃博拉病毒感染会干扰一种重要的免疫化合物——干扰素。”阿马拉辛赫说,“现在我们终于知道埃博拉病毒是怎么做到的了。这项研究将会对新疗法的研发工作起到指导性的作用。”

研究者介绍说,转录因子STAT1会携带干扰素提供的抗病毒信息,而VP24 蛋白会阻止STAT1进入细胞核并引发免疫反应。在人体的快速免疫反应机制作用之下,细胞会允许STAT1走“应急通道”进入细胞核。埃博拉病毒的VP24蛋白并不能完全阻止细胞核与外界进行交换,但它会封闭STAT1的“应急通道”。

“在一般情况下,干扰素会促使STAT1进入细胞核,激活参与抗病毒反应的数百个蛋白质的基因。”华盛顿大学医学院的黛西·梁(Daisy Leung)博士说,“但如果VP24附着在STAT1上,STAT1就无法进入细胞核了。”

“埃博拉病毒之所以会如此致命,一个关键原因就是它会干扰人体的正常免疫反应。”西奈山伊坎医学院的克里斯·巴斯勒(Chris Basler)博士说,“了解VP24如何干扰免疫系统,将帮助我们找出对抗埃博拉病毒的方法。”

现在正是埃博拉病毒研究的关键时期,而这一新发现可谓正逢其时。如果研究者继续对VP24进行更加深入的研究,他们或许能找到新的治疗方法,消除VP24对人体免疫反应的不良影响。

原始出处:

Xu W1, Edwards MR2, Borek DM3, Feagins AR2, Mittal A4, Alinger JB1, Berry KN1, Yen B2, Hamilton J2, Brett TJ5, Pappu RV4, Leung DW1, Basler CF2, Amarasinghe GK6.Ebola Virus VP24 Targets a Unique NLS Binding Site on Karyopherin Alpha 5 to Selectively Compete with Nuclear Import of Phosphorylated STAT1.Cell Host Microbe. 2014 Aug 13;16(2):187-200. doi: 10.1016/j.chom.2014.07.008.

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    2015-01-15 xjy02
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    2014-09-09 维他命
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