
Nature:抵御流感等病毒侵袭的新方法
加拿大麦吉尔大学发现了一种可以提高生物组织自然抵抗病毒的方法,利用该方法可以有效地使生物组织细胞对流感和其他病毒产生免疫能力。相关研究结果发表在2月13日在线发表于《自然》杂志上。
病毒是一种亚微观的传染性中介,它只能够通过细胞的复制能力进行自身复制。这种复制过程通常导致疾病的产生,甚至导致生物组织自身的死亡。
干扰素特别是1型干扰素具有限制病毒繁殖的能力。而1型干扰素又受到干扰素调节蛋白质7(lrf7)的控制,研究人员认为lrf7是体内干扰素生产的主要调节器。麦吉尔大学的研究人员发现,lrf7的蛋白合成受到被称为4E-BP1和4E-BP2两种抑制基因的控制。
实验中,科研人员从老鼠体内去除了上述两种阻止蛋白干扰素生产的基因。去除这两种基因后,老鼠细胞能够生产出更高水平的干扰素,这些干扰素可以有效阻止病毒自我复制。研究人员使用该方法对流感病毒、脑心肌炎病毒、疱疹性口炎病毒等进行了测试。
研究人员表示,从原理上讲,这似乎非常简单,其实就是去除抑制后,将会有更多的关键蛋白质lrf7现身,lrf7导致细胞内部形成抗病毒状态。
研究人员没有发现在实验鼠体内提高干扰素的产量会导致任何异常或副作用产生,他们知道,从人体内完全去除这两种基因是不可能的,但研究人员对利用其研究成果找到新的病毒治疗方法感到非常乐观。如果能够使用药物对付这两种基因,就可以使人们免遭病毒的侵袭。目前,这种药物虽然还不存在,但这正是今后的研究方向。(来源:科技日报 杜华斌)
(《自然》(Nature),doi:10.1038/nature06730,Rodney Colina, Nahum Sonenberg)
生物谷推荐原始出处:
Nature advance online publication 13 February 2008 | doi:10.1038/nature06730; Received 28 November 2007; Accepted 25 January 2008; Published online 13 February 2008
Translational control of the innate immune response through IRF-7
Rodney Colina1,4, Mauro Costa-Mattioli1,4, Ryan J. O. Dowling1, Maritza Jaramillo1, Lee-Hwa Tai2, Caroline J. Breitbach3, Yvan Martineau1, Ola Larsson1, Liwei Rong1, Yuri V. Svitkin1, Andrew P. Makrigiannis2, John C. Bell3 & Nahum Sonenberg1
- Department of Biochemistry and McGill Cancer Center, McGill University, Montreal, Quebec H3G 1Y6, Canada
- Institut de Recherches Cliniques de Montréal, Laboratory of Molecular Immunology, Université de Montréal, Montréal, Quebec H2W 1R7, Canada
- Ottawa Health Research Institute, Ottawa, Ontario K1H 8L6, Canada
- These authors contributed equally to this work.
Correspondence to: Mauro Costa-Mattioli1,4Nahum Sonenberg1 Correspondence and requests for materials should be addressed to N.S. (Email: nahum.sonenberg@mcgill.ca) or M.C.-M. (Email: mauro.costa-mattioli@mail.mcgill.ca).
Abstract
Transcriptional activation of cytokines, such as type-I interferons (interferon (IFN)-
and IFN-
), constitutes the first line of antiviral defence. Here we show that translational control is critical for induction of type-I IFN production. In mouse embryonic fibroblasts lacking the translational repressors 4E-BP1 and 4E-BP2, the threshold for eliciting type-I IFN production is lowered. Consequently, replication of encephalomyocarditis virus, vesicular stomatitis virus, influenza virus and Sindbis virus is markedly suppressed. Furthermore, mice with both 4E- and 4E-BP2 genes (also known as Eif4ebp1 and Eif4ebp2, respectively) knocked out are resistant to vesicular stomatitis virus infection, and this correlates with an enhanced type-I IFN production in plasmacytoid dendritic cells and the expression of IFN-regulated genes in the lungs. The enhanced type-I IFN response in 4E-BP1 -/- 4E-BP2 -/- double knockout mouse embryonic fibroblasts is caused by upregulation of interferon regulatory factor 7 (Irf7) messenger RNA translation. These findings highlight the role of 4E-BPs as negative regulators of type-I IFN production, via translational repression of Irf7 mRNA.
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