CN113265426B - 一种稳定表达猪圆环病毒2型orf3蛋白细胞株的构建及应用 - Google Patents
一种稳定表达猪圆环病毒2型orf3蛋白细胞株的构建及应用 Download PDFInfo
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Abstract
本发明公开了一种稳定表达猪圆环病毒2型ORF3蛋白细胞株的构建及应用,属于生物技术检测领域。构建方法包括以下步骤:(1)在pLVZG‑CMV‑copGFP‑Puro载体的NheI和BamHI多克隆位点插入PCV2 ORF3基因;(2)用构建好的pLVZG‑CMV‑ORF3‑copGFP‑Puro重组质粒与病毒包装质粒共转染293T细胞,培养、出毒、收取病毒上清、过滤得重组慢病毒液;(3)将包装好的重组慢病毒感染PK‑15细胞,通过嘌呤霉素筛选及鉴定,得稳定表达PCV2 ORF3蛋白细胞株。本发明利用重组慢病毒系统制备一种融合标签蛋白并能稳定表达PCV2 ORF3蛋白的细胞株,该细胞株为研究PCV2致病机理研究提供平台,有利于猪圆环病毒2型的深层次的致病机制研究。
Description
技术领域
本发明属于生物技术检测领域,具体涉及一种稳定表达猪圆环病毒2型ORF3蛋白细胞株的构建及应用。
背景技术
猪圆环病毒2型(porcine circovirus type 2,PCV2)是猪圆环病毒病(porcinecircovirus disease, PCVD)的病原,引起仔猪断奶后多系统衰竭综合征(postweaningmultisystemic wasting syndrome, PMWS),目前PMWS已成为全球范围内危害猪群健康的重要疾病。PCV2属于圆环病毒科圆环病毒属,病毒粒子大小为17 – 22 nm,呈对称的二十面体,无囊膜,基因组大小约1.7 kb,包含11个开放阅读框(open reading frames,ORFs),目前己报道5个ORF编码蛋白及其功能研究,即ORF1、ORF2、ORF3、ORF4和ORF5。PCV2感染导致PCVD的典型组织病理学症状是淋巴细胞损伤和组织细胞浸润,感染PCV2发病猪出现显著凋亡坏死的细胞是淋巴细胞,使机体出现免疫抑制状态,因此认为PCV2致病机制与其对免疫器官的损伤密切相关。研究发现ORF3的缺失并不能影响病毒的复制,而ORF3基因表达的细胞出现了与PCV2病毒感染类似的细胞凋亡现象。因此,ORF3诱导淋巴细胞凋亡造成体内淋巴细胞数量减少可能是PCV2引起猪机体免疫抑制的重要原因,但是ORF3如何诱导细胞凋亡有待验证。
发明内容
本发明的目的是提供一种稳定表达猪圆环病毒2型ORF3蛋白细胞株的构建及应用,利用重组慢病毒系统制备一种融合标签蛋白并能稳定表达PCV2 ORF3蛋白的PK-15细胞株,该细胞株为研究PCV2 ORF3蛋白的生物学功能提供一个很好的工具。
为实现上述目的,本发明采用的技术方案如下;
所述细胞株购买于中国典型培养物保藏中心,购买的细胞株编号为:CCTCC NO:GDC0061,本发明所提供的稳定表达PCV2 ORF3蛋白细胞株的构建方法,包括如下步骤:
(1)PCV2 ORF3基因的扩增;
(2)将PCV2 ORF3基因与载体pLVZG-CMV-copGFP-Puro双酶切后连接,构建重组慢病毒表达质粒pLVZG-CMV-ORF3-copGFP-Puro;
(3)将重组慢病毒表达质粒pLVZG-CMV-ORF3-copGFP-Puro与慢病毒包装质粒(三种辅助质粒)共转染293T细胞,48 h后,收集细胞上清液,并根据细胞生长状况适当补充新鲜细胞培养基,72 h再次收集一次细胞上清液,将收集的细胞上清液用0.45 μm 滤器过滤,4℃储存;然后将收集的细胞上清液,4°C ,3000 rpm ,离心20 min,去除细胞碎片;然后收集上清液置于新的离心管中,加入适量慢病毒浓缩液,4°C沉淀4 h, 8000 × g ,离心30min,去上清,PBS洗涤沉淀,最后加入5 mL PBS溶解;将溶解液加入预先消毒处理的超滤浓缩管中进一步浓缩和纯化,5000× g,离心15 min,获得小于1 mL的病毒浓缩液,用PBS补足至5 mL,再次离心置换缓冲液,此步骤重复3次,最后在病毒浓缩液中加入适量病毒稀释液(DMEM培养液)稀释至1.2 mL;-80°C冰箱保存,备用;
(4)将包装好的重组慢病毒转染PK-15细胞,通过嘌呤霉素筛选阳性细胞株,对阳性细胞株进行细胞免疫荧光和qPCR鉴定,获得稳定表达PCV2 ORF3蛋白细胞株。
进一步地,所述的步骤(1)设计PCV2 ORF3-F和PCV2 ORF3-R为特异性引物,添加酶切位点NheI和BamHI,以感染PCV2的PK-15细胞DNA为模板,进行PCR扩增;所述的特异性引物PCV2 ORF3-F的序列见序列表SEQ ID 1,PCV2 ORF3-R的序列见序列表SEQ ID 2。
进一步地,所述的步骤(1)PCR扩增体系为:模板1 μl,Primer F(10 μM) 1 μL,Primer R(10 μM) 1 μl,PCR Mix(2×)25 μl,ddH2O 补充至 50 μl;PCR反应程序:95℃预变性5min,95℃变性30 s,55℃退火30s,72℃延伸45s,共循环35次,最后72℃再延伸10min;PCR结束后,取10μL扩增产物在琼脂糖凝胶上电泳,分离、回收纯化。
进一步地,步骤(2)中链接体系为:目的基因 13 μL,载体DNA 4 μL,T4 DNALigase 1 μL,10×T4 DNA Ligase Buffer 2 μL,16℃过夜连接过夜。
进一步地,步骤(3)中,所述的慢病毒包装质粒是pMDLg/pRRE,pRSV-Rev,pMD2.G。
进一步地,步骤(4)中所述的qPCR鉴定的特异性检测引物ORF3-F和ORF3-R的序列见序列表SEQ ID 4和SEQ ID 5,特异性检测引物GAPDH-F和GAPDH-R的序列见序列表SEQ ID6和SEQ ID 7。
本发明的原理和最核心的关键技术是科学合理地构建了插入PCV2 ORF3基因的慢病毒系统表达质粒pLVZG-CMV-ORF3-copGFP-Puro,之后将该质粒转化入Stbl2感受态细胞大量扩增,与pMDLg/pRRE,pRSV-Rev,pMD2.G三种辅助质粒共转染293T细胞进行慢病毒的包装,用收集的慢病毒感染PK-15细胞,成功感染的话,慢病毒载体会将携带的PCV2 ORF3基因和载体上的嘌呤霉素抗性基因一起整合入PK-15细胞基因组,经一定浓度的嘌呤霉素加压筛选,并通过克隆纯化获得稳定表达PCV2 ORF3蛋白的带有嘌呤霉素抗性的重组细胞系,可用于PCV2 ORF3蛋白功能检测。
与现有技术相比,本发明的有益效果如下:
1.本发明以重组慢病毒为载体,将其感染PK-15细胞,筛选获得能稳定表达PCV2ORF3蛋白的PK-15细胞株,所述PCV2 ORF3蛋白融合表达Flag标签,方便PCV2 ORF3蛋白表达的检测。
2.本发明建立了一种带有标签的能稳定表达PCV2 ORF3蛋白的PK-15细胞株,为PCV2 ORF3蛋白生物学特性及功能的研究提供一个良好的工具,为进一步深入研究PCV2ORF3蛋白的生物学特性和感染途径及为阐明PCV2的免疫抑制机理垫定理论基础。
附图说明
图1是本发明构建的重组表达载体pLVZG-CMV-ORF3-copGFP-Puro结构示意图。
图2是重组表达载体pLVZG-CMV-ORF3-copGFP-Puro经Nhe I和BamH I双酶切鉴定电泳图(M:DNA Marker;泳道1:pLVZG-CMV-copGFP-Puro空载体酶切后仅观察到8kb大小左右的载体条带;泳道2:重组表达载体pLVZG-CMV-ORF3-copGFP-Puro酶切后可产生8kb大小的载体条带和315bp大小的目的条带)。
图3 PK15-ORF3稳转株细胞荧光显微镜下观察结果(100×)(A:白光下细胞形态;B:绿色荧光下细胞形态)。
图4 PK15-ORF3稳转株细胞ORF3 mRNA相对表达量。
具体实施方式
下面将通过附图和具体实施例对本发明做进一步的具体描述,但不能理解为是对本发明保护范围的限定。
实施例1 PCV2 ORF3基因扩增
1、PCV2 ORF3基因PCR扩增根据NCBI中PCV2 ORF3基因序列(No:AY686763),利用软件primer 5设计PCV2 ORF3基因的特异性引物PCV2 ORF3-F和PCV2 ORF3-R,添加酶切位点NheI和BamH I,为方便后续的鉴定,在基因3'末端添加Flag标签序列(序列见列表SEQ ID3)。以感染PCV2的PK-15细胞DNA为模板,进行PCR扩增,PCR扩增体系为:模板 1 μl,PrimerF(10 μM) 1 μL,Primer R(10 μM) 1 μl,PCR Mix(2×) 25 μl,ddH2O up to 50 μl;PCR反应程序:95℃预变性5min,95℃变性30 s,55℃退火30s,72℃延伸45s,共循环35次,最后72℃再延伸10min。PCR结束后,取10μL扩增产物在1%琼脂糖凝胶上电泳,琼脂糖凝胶DNA回收试剂盒说明书进行DNA回收。
实施例2重组表达载体pLVZG-CMV-copGFP-Puro的构建
重组慢病毒表达质粒的构建:将实施例1中得到的PCR产物与pLVZG-CMV-copGFP-Puro分别进行NheI和BamHI酶切,酶切体系于37℃水浴过夜,电泳,将正确的目的条带进行凝胶回收。酶切体系如下:ddH2O:11ul;NheI:1.5ul;BamH I:1.5ul;DNA:1ul(1ug/ul);Enzyme Buffer:5ul;总体系:20ul,温度37℃,反应时间:30min。在16℃反应24h,构建重组慢病毒表达质粒,构建重组慢病毒表达质粒pLVZG-CMV-ORF3-copGFP-Puro(见图1)。重组载体经NheI和BamHI双酶切之后经琼脂糖凝胶电泳鉴定可观察到8kb大小的载体条带和305bp大小的目的条带,而pLVZG-CMV-copGFP-Puro空载体双酶切后仅观察到8kb大小的载体条带(见图2)。重组质粒转化感受态大肠杆菌E.coli DH 5α,质粒提取试剂提取重组质粒,用NanoDrop测定OD 260及OD 280,计算质粒纯度及浓度。
实施例3重组慢病毒CMV-ORF3-copGFP-Puro的获得
1.慢病毒包装
293T细胞种于10cm培养皿中,置于37°C,5 % CO2的培养箱中,传代12h后细胞融合度达到80%左右。质粒共转体系:pMDLg/pRRE 6 μg,pRSV-Rev 3 μg,pMD2.G 2 μg,穿梭质粒9 μg,Lipo3000 40 μL。转染前1h,更换不含双抗,含10%FBS的培养基;转染后6 h,更换含10% FBS的新鲜培养基。转染后48h,收集细胞上清液,并根据细胞生长状况适当补充新鲜细胞培养基,72h再次收集一次细胞上清液;将收集的细胞上清液(DMEM培养液)用0.45 μm 滤器过滤,4℃储存备用;
2.病毒浓缩和纯化
将收集的细胞上清液,4°C ,3000 rpm ,离心20 min,去除细胞碎片;然后收集上清液置于新的离心管中,加入适量慢病毒浓缩液,4°C沉淀4 h,8000 × g,离心30 min,去上清,PBS洗涤沉淀,最后加入5 mL PBS溶解;将溶解液加入预先消毒处理的超滤浓缩管中进一步浓缩和纯化,5000× g,离心15 min,获得小于1 mL的病毒浓缩液,用PBS补足至5mL,再次离心置换buffer,此步骤重复3次,最后在病毒浓缩液加入适量病毒稀释液稀释至1.2 mL; -80°C冰箱保存,备用。
3.慢病毒滴度检测
将生长状态良好的293T细胞消化后,按1.5×104/孔,加入96孔板中,置于37°C,5% CO2 培养箱中培养。24 h后准备8个1.5 mL EP管,每管加入216 μL完全培养基,第一个EP管中加入24 μL病毒液(冻融一次),然后做10倍梯度稀释,共8个稀释度。48 h后,加入完全培养基100 μL,避免吹起细胞。72 h后,用荧光显微镜对阳性细胞进行计数,数出最后两个稀释度能观察到荧光的孔内荧光细胞数,计算每个稀释度2个复孔内的平均荧光细胞数,设为X(倒数第二个稀释度孔的荧光细胞平均数)和Y(倒数第一个稀释度孔的荧光细胞平均数)。
慢病毒滴度 (TU/mL) = {[(X+Y×10)/2] /X孔病毒量}×1000
滴度单位:TU/mL,指每毫升中含有的具有生物活性的病毒颗粒数。
实施例4稳定转染细胞株的筛选
1.嘌呤霉素筛选浓度的确定:
在24孔板内接种PK-15细胞,共11孔,传代12 h细胞融合度至80%~90%,依次给每孔换上加入了嘌呤霉素的完全培养基(10%FBS-DMEM),分别为0,1,2,3,4,5,6,7,8,9,10μg/mL的浓度梯度,每隔2天观察细胞存活状态(细胞飘起即为死亡),每隔2天更换0.75mL含相应浓度嘌呤霉素的培养基。筛选5~7天内使细胞全部死完的最低嘌呤霉素浓度,即为筛选浓度。第5天,含有5μg/mL嘌呤霉素的孔内的PK-15细胞死完,确定含有5μg/mL的嘌呤霉素完全培养基为之后的筛选培养基。
2.稳定转染细胞株筛选
在24孔板内接种PK-15细胞,传代12 h细胞融合度至80%~90%,接种病毒,病毒液滴度5× 107TU/mL,病毒量15μL。在感染细胞72小时后,通过加入并维持5μg/mL的嘌呤霉素杀死未被有效感染的细胞;每隔2-3天换一次新鲜培养基;倒置荧光显微镜下观察,进行亚克隆筛选,挑选出正常生长细胞群传代,逐步放大培养;从而在嘌呤霉素的维持下筛选阳性细胞株。
3、阳性细胞株的检测
用荧光显微镜对阳性细胞进行免疫荧光鉴定,观察到明显绿色荧光(见图3),该结果显示细胞系PK-ORF3可以成功表达ORF3蛋白。重组细胞系的qPCR鉴定:使用RNA提取试剂盒提取细胞系PK-ORF3的RNA,反转录为cDNA,采用SYBR Green染料检测ORF3的表达,用特异性引物(ORF3检测引物见SEQ ID 4和5,GAPDH检测引物见SEQ ID 6和7)进行qPCR扩增,结果显示重组细胞系PK-ORF3在转录水平成功表达ORF3基因(见图4)。
序列表
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Claims (1)
1.一种稳定表达猪圆环病毒2型ORF3蛋白细胞株的构建方法,其特征在于,包括如下步骤:
(1)PCV2 ORF3基因的扩增:
设计PCV2 ORF3-F和PCV2 ORF3-R为特异性引物,添加酶切位点NheI和BamHI,以感染PCV2的PK-15细胞DNA为模板,进行PCR扩增; 特异性引物PCV2 ORF3-F的序列见序列表SEQID 1,PCV2 ORF3-R的序列见序列表SEQ ID 2;PCR扩增体系为:模板 1 μL,10 μM Primer F1 μL,10 μM Primer R 1 μL,2×PCR Mix 25 μL,ddH2O up to 50 μL;PCR反应程序:95℃预变性5 min,95℃变性30 s,55℃退火30s,72℃延伸45s,共循环35次,最后72℃再延伸10min;PCR结束后,取10μL扩增产物在琼脂糖凝胶上电泳,分离、回收纯化;
(2)将PCV2 ORF3基因与载体pLVZG-CMV-copGFP-Puro双酶切后连接,构建重组慢病毒表达质粒pLVZG-CMV-ORF3-copGFP-Puro;
连接体系为:目的基因 13 μL,载体DNA 4 μL,T4 DNA Ligase 1 μL,10×T4 DNALigase Buffer 2 μL,16℃连接过夜;
(3)将重组慢病毒表达质粒pLVZG-CMV-ORF3-copGFP-Puro与慢病毒包装质粒共转染293T细胞,48 h后,收集细胞上清液,并根据细胞生长状况适当补充新鲜细胞培养基,72 h再次收集一次细胞上清液,将收集的细胞上清液用0.45 μm 滤器过滤,4℃储存;再将收集的细胞上清液离心,去除细胞碎片;然后收集上清液置于新的离心管中,加入慢病毒浓缩液,4°C沉淀4 h, 8000 × g ,离心30 min,去上清,PBS洗涤沉淀,最后加入5 mL PBS溶解;将溶解液加入预先消毒处理的超滤浓缩管中进一步浓缩和纯化,5000× g,离心15 min,获得小于1 mL的病毒浓缩液,用PBS补足至5 mL,再次离心置换缓冲液,此步骤重复3次,最后在病毒浓缩液中加入DMEM培养液稀释至1.2 mL;-80°C冰箱保存,备用;
所述的慢病毒包装质粒是pMDLg/pRRE,pRSV-Rev,pMD2.G;
(4)将包装好的重组慢病毒转染PK-15细胞,通过嘌呤霉素筛选阳性细胞株,对阳性细胞株进行细胞免疫荧光和qPCR鉴定,获得稳定表达PCV2 ORF3蛋白细胞株;
其中,qPCR鉴定的引物为特异性检测引物ORF3-F、ORF3-R以及特异性检测引物GAPDH-F、GAPDH-R,所述特异性检测引物ORF3-F和ORF3-R的序列见序列表SEQ ID 4和SEQ ID 5,特异性检测引物GAPDH-F和GAPDH-R的序列见序列表SEQ ID 6和SEQ ID 7。
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