Coxsackievirus A16(CVA16),together with enterovirus type 71(EV71),is responsible for most cases of hand,foot and mouth disease(HFMD) worldwide.Recent findings suggest that the recombination between CVA16 and EV71,and ...Coxsackievirus A16(CVA16),together with enterovirus type 71(EV71),is responsible for most cases of hand,foot and mouth disease(HFMD) worldwide.Recent findings suggest that the recombination between CVA16 and EV71,and the co-circulation of these two viruses may have contributed to the increase of HFMD cases in China over the past few years.It is therefore important to further understand the virology,epidemiology,virus-host interactions and host pathogenesis of CVA16.In this study,we describe the viral kinetics of CVA16 in human rhabdomyosarcoma(RD) cells by analyzing the cytopathic effect(CPE),viral RNA replication,viral protein expression,viral RNA package and viral particle secretion in RD cells.We show that CVA16 appears to first attach,uncoat and enter into the host cell after adsorption for 1 h.Later on,CVA16 undergoes rapid replication from 3 to 6 h at MOI 1 and until 9 h at MOI 0.1.At MOI 0.1,CVA16 initiates a secondary infection as the virions were secreted before 9 h p.i.CPE was observed after 12 h p.i.,and viral antigen was first detected at 6 h p.i.at MOI 1 and at 9 h p.i.at MOI 0.1.Thus,our study provides important information for further investigation of CVA16 in order to better understand and ultimately control infections with this virus.展开更多
目的本研究旨在探究柯萨奇病毒A组16型(Coxsackievirus A 16,CVA16)感染后是否会影响N6-甲基腺嘌呤(N6-methyladenosine,m6A)甲基化相关蛋白在人呼吸道上皮细胞(16HBE)、ICR乳鼠和SCARB2人源化小鼠中的表达,以及在细胞中的定位。方法病...目的本研究旨在探究柯萨奇病毒A组16型(Coxsackievirus A 16,CVA16)感染后是否会影响N6-甲基腺嘌呤(N6-methyladenosine,m6A)甲基化相关蛋白在人呼吸道上皮细胞(16HBE)、ICR乳鼠和SCARB2人源化小鼠中的表达,以及在细胞中的定位。方法病毒分别以感染复数(MOI)=0.1感染16HBE和107 CCID50/ml感染小鼠,Western blot分析甲基转移酶、去甲基化酶和甲基化阅读蛋白的表达变化,免疫荧光观察这些蛋白质在细胞中的定位。结果研究结果发现,随着CVA16病毒感染时间的增加,m6A甲基化相关蛋白在细胞中表达水平逐渐下调,在ICR乳鼠和SCARB2小鼠中无明显变化;病毒感染后,m6A甲基化相关蛋白在细胞核与细胞质中重新分布,甚至发生降解。结论CVA16在宿主细胞中复制时可以改变m6A甲基化修饰相关蛋白的表达和细胞定位。本研究结果提示m6A修饰可能是肠道病毒治疗的潜在新靶点。展开更多
研究2014年安徽省手足口病（Hand,foot and mouth disease,HFMD）患儿中分离的柯萨奇病毒A组16型（Coxsachivirus A 16,CVA16）毒株VP1区基因特征。收集安徽省2014年1月至11月期间413份HFMD患儿咽拭子标本接种敏感细胞分离肠道病毒,用...研究2014年安徽省手足口病（Hand,foot and mouth disease,HFMD）患儿中分离的柯萨奇病毒A组16型（Coxsachivirus A 16,CVA16）毒株VP1区基因特征。收集安徽省2014年1月至11月期间413份HFMD患儿咽拭子标本接种敏感细胞分离肠道病毒,用荧光定量RT-PCR鉴定细胞培养物,对CVA16阳性培养物进行毒株VP1区RT-PCR扩增及核苷酸序列测定和基因特征分析,并与国内外参考序列构建基因亲缘性关系树。共分离鉴定出肠道病毒阳性培养物97份,其中CVA16病毒分离株17株,人肠道病毒71型（Human enterovirus 71,HEV71）分离株76株,其它肠道病毒分离株4株,总体病毒分离率为23.49%（97/413）。CVA16基因亲缘性关系分析显示：安徽省2014分离的17株CVA16毒株都属于B1基因型B1b一个分支,它们之间在核苷酸和氨基酸水平上的同源性分布为分别为95.30%~100%和98.70%~100%,但在B1b分支内形成几个传播链。17株CVA16毒株VP1区核苷酸序列与国内云南、湖南、广东、西藏和江苏地区病毒分离株同源性较高,亲缘性关系近,其中与湖南2013年和广东深圳2014年CVA16病毒分离株同源性最高,为96.40%~99.70%。2014年安徽省分离的CVA16病毒分离株属于B1基因型B1b亚型,为优势流行株;在B1b分支内形成多个小的病毒传播链共同流行。展开更多
基金Partly supported by the National Natural Science Foundation of China (No. 20872048)
文摘Coxsackievirus A16(CVA16),together with enterovirus type 71(EV71),is responsible for most cases of hand,foot and mouth disease(HFMD) worldwide.Recent findings suggest that the recombination between CVA16 and EV71,and the co-circulation of these two viruses may have contributed to the increase of HFMD cases in China over the past few years.It is therefore important to further understand the virology,epidemiology,virus-host interactions and host pathogenesis of CVA16.In this study,we describe the viral kinetics of CVA16 in human rhabdomyosarcoma(RD) cells by analyzing the cytopathic effect(CPE),viral RNA replication,viral protein expression,viral RNA package and viral particle secretion in RD cells.We show that CVA16 appears to first attach,uncoat and enter into the host cell after adsorption for 1 h.Later on,CVA16 undergoes rapid replication from 3 to 6 h at MOI 1 and until 9 h at MOI 0.1.At MOI 0.1,CVA16 initiates a secondary infection as the virions were secreted before 9 h p.i.CPE was observed after 12 h p.i.,and viral antigen was first detected at 6 h p.i.at MOI 1 and at 9 h p.i.at MOI 0.1.Thus,our study provides important information for further investigation of CVA16 in order to better understand and ultimately control infections with this virus.
文摘目的本研究旨在探究柯萨奇病毒A组16型(Coxsackievirus A 16,CVA16)感染后是否会影响N6-甲基腺嘌呤(N6-methyladenosine,m6A)甲基化相关蛋白在人呼吸道上皮细胞(16HBE)、ICR乳鼠和SCARB2人源化小鼠中的表达,以及在细胞中的定位。方法病毒分别以感染复数(MOI)=0.1感染16HBE和107 CCID50/ml感染小鼠,Western blot分析甲基转移酶、去甲基化酶和甲基化阅读蛋白的表达变化,免疫荧光观察这些蛋白质在细胞中的定位。结果研究结果发现,随着CVA16病毒感染时间的增加,m6A甲基化相关蛋白在细胞中表达水平逐渐下调,在ICR乳鼠和SCARB2小鼠中无明显变化;病毒感染后,m6A甲基化相关蛋白在细胞核与细胞质中重新分布,甚至发生降解。结论CVA16在宿主细胞中复制时可以改变m6A甲基化修饰相关蛋白的表达和细胞定位。本研究结果提示m6A修饰可能是肠道病毒治疗的潜在新靶点。
文摘研究2014年安徽省手足口病（Hand,foot and mouth disease,HFMD）患儿中分离的柯萨奇病毒A组16型（Coxsachivirus A 16,CVA16）毒株VP1区基因特征。收集安徽省2014年1月至11月期间413份HFMD患儿咽拭子标本接种敏感细胞分离肠道病毒,用荧光定量RT-PCR鉴定细胞培养物,对CVA16阳性培养物进行毒株VP1区RT-PCR扩增及核苷酸序列测定和基因特征分析,并与国内外参考序列构建基因亲缘性关系树。共分离鉴定出肠道病毒阳性培养物97份,其中CVA16病毒分离株17株,人肠道病毒71型（Human enterovirus 71,HEV71）分离株76株,其它肠道病毒分离株4株,总体病毒分离率为23.49%（97/413）。CVA16基因亲缘性关系分析显示：安徽省2014分离的17株CVA16毒株都属于B1基因型B1b一个分支,它们之间在核苷酸和氨基酸水平上的同源性分布为分别为95.30%~100%和98.70%~100%,但在B1b分支内形成几个传播链。17株CVA16毒株VP1区核苷酸序列与国内云南、湖南、广东、西藏和江苏地区病毒分离株同源性较高,亲缘性关系近,其中与湖南2013年和广东深圳2014年CVA16病毒分离株同源性最高,为96.40%~99.70%。2014年安徽省分离的CVA16病毒分离株属于B1基因型B1b亚型,为优势流行株;在B1b分支内形成多个小的病毒传播链共同流行。
