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Science上去年5月关于RNAi干扰HCV病毒复制的文献

文献名称:Inhibition of intracellular hepatitis C virus replication by synthetic and vector-derived small interfering RNAs

摘要:Small interfering RNAs (siRNAs) efficiently inhibit gene expression by RNA interference. Here, we report efficient inhibition, by both synthetic and vector-derived siRNAs, of hepatitis C virus (HCV) replication, as well as viral protein synthesis, using an HCV replicon system. The siRNAs were designed to target the 5' untranslated region (5' UTR) of the HCV genome, which has an internal ribosomal entry site for the translation of the entire viral polyprotein. Moreover, the 5' UTR is the most conserved region in the HCV genome, making it an ideal target for siRNAs. Importantly, we have identified an effective site in the 5' UTR at which 80% suppression of HCV replication was achieved with concentrations of siRNA as low as 2.5 nM. Furthermore, DNA-based vectors expressing siRNA against HCV were also effective, which might allow the efficient delivery of RNAi into hepatocytes in vivo using viral vectors. Our results support the feasibility of using siRNA-based gene therapy to inhibit HCV replication, which may prove to be valuable in the treatment of hepatitis C.

主要内容简单介绍:用针对HCV基因组5‘端保守序列的siRNA,转染HCV病毒,发现HCV病毒基因的复制表达被抑制了80%左右。从而提示可以用于临床治疗丙型肝炎。

编译:
段落1—介绍丙型肝炎的危害,以及治疗措施方面的不得力
段落2—介绍RNA干扰的技术
段落3—介绍丙型肝炎病毒基因组的基因结构,以及根据其序列,发现5端是一个理想的RNA干扰靶点

实验流程:
我们用siRNA和以DNA为基础的siRNA表达载体导入HCV基因中,然后将其置于HCV复制系统中,观察其病毒复制的抑制效应。
因为文献比较简单,所以把章节列出,有兴趣自己去看看
siRNAs directed against the HCV 5' untranslated region
Effect of siRNA oligonucleotides on pIRES–Fluc
Effect of siRNA on HCV Feo-replicon cells
DNA-vector-based siRNAs suppressed HCV replication

实验中所用的技术:
1,  准备siRNA和以DNA为基础的siRNA表达载体;
2,  HCV复制表达报告基因
3,  细胞培养和转染
4,  荧光素酶含量测定
5,  Northern 杂交
6,  Western blotting
7,  统计学分析

结果:
我们的结果发现siRNA对HCV的抑制功能比IRES reporter vector要强,这个可能要归结于其自我复制的机制;阻断IRES调节的某些蛋白的合成,而后者正是病毒RNA合成的关键;而我们发现针对5端保守序列的siRNA既可以减少蛋白的合成,又可以抑制RNA的复制。

ic and vector-derived small interfering RNAs原稿.doc (259.0k) 这篇文章是发在EMBO Reports 4, 6, 602–608 (2003)
doi:10.1038/sj.embor.embor840
AOP Published online: 9 May 2003

http://www.nature.com/cgi-taf/DynaPage.taf?file=/embor/journal/v4/n6/abs/embor840.html&dynoptions=doi1098754100 呵呵,版主真是细心啊!
我简单说明一下,我所收集的有关RNAi的文章是我们几个同事一起用来研究参考用的,包括很多篇,我大概翻译了几篇,因为都是最近的文章,也就没有仔细看了。

---在这里,向广大圆友们致歉啊!
pengding3 wrote:
呵呵,版主真是细心啊!
我简单说明一下,我所收集的有关RNAi的文章是我们几个同事一起用来研究参考用的,包括很多篇,我大概翻译了几篇,因为都是最近的文章,也就没有仔细看了。

---在这里,向广大圆友们致歉啊!
如何修改标题啊?请指教—————— 利用RNAi技术来减少病毒复制。是新技术么?高人指点。小弟水平比较差。问一个比较笨的问题
pengding3 wrote:
如何修改标题啊?请指教——————
RNAi本身大概就是生物体为了抵抗外来病毒类基因入侵而进化的一种防御机制。不过就脊椎动物和动物病毒而言,情况更加复杂一点,病毒更容易变异和逃避机体的灭活。这里的具体机制正有待阐明,但是就muqian的报道,用RNAi减少甚至消灭病毒,都是很有希望的工作。

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作者:admin@医学,生命科学    2010-11-29 17:13
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