Interference of porcine reproductive and respiratory syndrome virus replication on MARC-145 cells using DNA-based short interfering RNAs

文献类型： 外文期刊

第一作者： He, Yun-xia

作者： He, Yun-xia;Hua, Rong-hong;Zhou, Yan-jun;Qiu, Hua-ji;Tong, Guang-zhi

作者机构：

关键词： PRRSV;RNAi;shRNA;siRNA

期刊名称：ANTIVIRAL RESEARCH （ 影响因子：5.97； 五年影响因子：5.801 ）

ISSN： 0166-3542

年卷期： 2007 年 74 卷 2 期

页码：

收录情况： SCI

摘要： Porcine reproductive and respiratory syndrome (PRRS) is an economically important disease in swine-producing areas of the world. Many vaccine strategies developed to control the disease are not yet completely successful. The objective of this study was to determine if RNA interference (RNAi) could be utilized to inhibit PRRSV replication on MARG 145 cells. Four short interfering RNA (siRNA) sequences (N95, N179, N218 and N294) directed against a well-conserved region of PRRSV genome ORF7 gene were selected. Sense and antisense siRNA encode sequences separated by a hairpin loop sequence were designed as short hairpin RNA (shRNA) expression cassettes driven by mouse U6 promoter. Using a polymerase chain reaction (PCR)-based approach, shRNAs were generated from shRNA expression cassettes. The PCR products were cloned into pEGFP-N1 vector and shRNA expression vectors were constructed. When MARG 145 cells were transfected with shRNA expression vectors and then infected with PRRSV, N179 was found to be the most effective inhibition site in decreasing cytopathic effect (CPE) induced by PRRSV. Western blot, indirect immunofluorescence and fluorescence quantitative PCR (FQ-PCR) confirmed that the expression of ORF7 was reduced both at protein and RNA levels comparing to controls. The results presented here indicated that DNA-based siRNA could effectively inhibit the replication of PRRS virus (approximately 681-fold reduction of viral titers) on MARC-145 cells. (c) 2006 Elsevier B.V. All rights reserved.

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