项目名称: miR-490通过调控NSP1表达抑制轮状病毒复制的作用机制研究
项目编号: No.81202326
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 医学免疫学、法医学
项目作者: 申子刚
作者单位: 中国人民解放军第三军医大学
项目金额: 23万元
中文摘要: 轮状病毒(RV)感染小肠上皮细胞,是婴幼儿腹泻的主要病因。应用生物芯片对RV感染肠上皮细胞Caco-2的microRNA表达谱分析后,发现miR-490在RV感染宿主细胞中的表达水平发生了显著的下调。但是miR-490在RV感染宿主细胞中表达改变的实际意义及生物学功能目前仍不清楚。我们前期在感染RV的Caco-2细胞中过量表达miR-490,发现它能抑制病毒RNA表达以及感染滴度,且显著诱导I型干扰素的表达。用生物软件预测miR-490在RV基因组上的靶基因是非结构蛋白1(NSP1)。我们推测miR-490可能通过调控NSP1表达抑制RV复制/感染的功能。本项目拟在RV感染体外/体内模型上,利用qRT-PCR、FFA和RNAi等技术方法,分析miR-490在RV感染的作用,阐明miR-490抵抗RV感染的作用机制,为有效治疗RV感染提供新的理论依据和潜伏靶点,具有较强的理论意义和应用价值。
中文关键词: 轮状病毒;腹泻;miR-490;I型干扰素;非结构蛋白1
英文摘要: Rotavirus infection of intestinal epithlial cells is a major cause of infant diarrhea. Microarray analysis of microRNA expression profile in rotavirus infection of Caco-2 cells, we found that miR-490 was significantly downregulated. However, the precise role of miR-490 in rotavirus infection of intestinal epithlial cells remains unclear. Overexpression of miR-490 in Caco-2 cells infected with rotavirus, we found that miR-490 could decrease expression of rotavirus RNA and suppress the infectious virus titer, and significantly induce the expression of type Ⅰinterferon. The target genes of miR-490 in rotavirus genome would be predicted by web-base computer program. It found that nonstructural protein 1(NSP1)is a target gene of miR-490. Thus we assume that miR-490 inhibits rotavirus replication by regulating the NSP1 expression. The project intends to analyze the role of miR-490, and elucidate the molecular mechanisms of miR-490 in vivo and in vitro by qRT-PCR, fluorescent focus assay and RNAi methods. This study has a strong theoretical and practical value, which provides a new theoretical basis and latency target for effective treatment of rotavirus infection.
英文关键词: rotavirus;diarrhea;miR-490;type I interferon;Nonstructural protein 1