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人工感染兔出血症病毒兔肝脏的蛋白质组学分析
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摘要
兔出血症(Rabbit hemorrhagic disease, RHD)是由兔出血症病毒(Rabbit hemorrhagic diseasevirus, RHDV)引起的兔的一种急性、败血性、高度接触性传染病,本病毒属嵌杯状病毒科(Caliciviridae)。自从上世纪八十年代首次在中国报道后,现已成为兔的一种世界流行的毁灭性传染病,给国内外养兔业带来了巨大的经济损失。病毒主要侵害兔的肝脏、肺脏和脾脏等器官,尤其以肝脏病变最为严重,是RHDV增殖的主要场所。因此,通过对肝脏群体蛋白质组学的研究对提示RHDV的感染机制和致病作用具有重大意义。本研究首次应用双向凝胶电泳比较感染后肝脏表达蛋白的差异,旨在从蛋白质群体水平上分析RHDV感染后兔肝脏蛋白表达的差异,并对筛选蛋白进行了相关功能验证,为进一步从蛋白质水平研究和揭示RHDV感染机制奠定基础。
     本研究利用双向凝胶电泳(2-DE)结合质谱技术对人工感染RHDV成年兔和未感染对照组兔肝脏组织的群体蛋白质表达情况进行分析。获得49个具有统计学意义的表达差异蛋白点,其中15个在感染中表达上调,34个表达下调。生物信息学分析表明这些蛋白质主要与能量代谢、物质运输有关,同时有部分属于细胞结构蛋白和其他蛋白,其中有些在病毒感染过程中起到了作用;筛选出了6种可能在病毒感染过程中起作用的差异蛋白:α1抗胰蛋白酶(Α1AT)、血清白蛋白前体(PA)、细胞色素P-450(CYP450)、纤维蛋白原(Fg)、层粘连蛋白受体(LR)和核不均一性核糖核蛋白(hnRNP)。应用荧光定量PCR技术对其中的A1AT、PA、hnRNP的转录水平进行了分析,结果表明A1AT、PA和hnRNP在RHDV感染组肝脏组织中的mRNA水平与未感染对照组的比值分别是0.217,0.299和0.829,变化趋势和其在相应蛋白质下调表达的变化是一致的。基于2-DE分析、荧光定量PCR检测和生物信息学分析,提示A1AT可能在病毒感染中挥发作用。
     从兔肝脏中提取总RNA,反转录成cDNA, PCR扩增,获得长度为1171bp的A1AT基因片段,分别与pET-30a和pEGFP-N1载体相连,分别构建A1AT的原核表达载体pET-30a-A1AT和A1AT的真核表达载体pEGFP-N1-A1AT。通过IPTG诱导原核表达,得到了可溶性A1AT蛋白。通过免疫共沉淀试验、血凝试验以及GST-pulldown试验,验证A1AT与VP60的相互作用,结果表明:免疫共沉淀试验和GST-polldown试验均表明A1AT与VP60之间存在相互作用;用A1AT中和RHDV后,血凝试验显示可抑制RHDV的血凝活性。将构建的pEGFP-N1-A1AT与pcDNA3.1-VP60重组表达载体共转染HEK293T细胞,进行激光共聚焦试验,表明A1AT能够与VP60在细胞内产生共定位。
     本研究通过2-DE分析结合质谱技术,获得了人工感染RHDV兔肝脏组织的差异表达蛋白质数据;生物信息学分析和转录水平分析,确定A1AT与VP60之间可能存在相互作用;通过免疫共沉淀试验、血凝试验、GST-pulldown试验和激光共聚焦技术证明了VP60可以与A1AT蛋白发生相互作用,并存在共定位,为进一步深入研究RHDV致病机理提供了参考。
Rabbit haemorrhagic disease virus (RHDV) is a calicivirus of the genus Lagovirus that causesrabbit haemorrhagic disease (RHD) in adult rabbits. First described in China in1984, the virus rapidlyspread worldwide and is nowadays considered as endemic in several countries. The liver, lung andspleen are the primary target tissues of RHDV. The major histopathological lesions found at necropsyare acute hepatitis due to liver cell loss as the result of RHDV-induced apoptosis, and splenomegaly.Therefore, to study the differences of protein expression profiles during the process of RHDV infectioncould help us to further elucidate the molecular mechanisms of pathogenicity.
     In our study, we used proteomics techniques to study the global protein expression change profilesof rabbit liver following RHDV infection in vivo. Total liver proteins were extracted from mature rabbitchallenged by RHDV and the mock-infected. Differentially expressed proteins were separated bytwo-dimensional gel electrophoresis, analyzed by mass spectrometry (MALDI–TOF-TOF) and proteindatabase searching. Forty-nine significantly different protein expression spots were screened, amongwhich fifteen protein spots were identified to be up-regulated and thirty-four down-regulated in RHDVinfection. We presume that five of them were involved with the infection of RHDV, includingalpha-1-antitrypsin(A1AT),serum albumin precursor(PA), laminin receptor,cytochrome P-450,fibrinogen and heterogeneous nuclear ribonucleoprotein(hnRNP). In addition, the transcriptional levelsof3genes (A1AT,PA and hnRNP) were verified by real time PCR, two of which was consistent withthe proteomic result. Next we also proceeded with further interaction verification and functional studiesof Α1AT which is one of the significantly different protein expression spots.
     To prokaryotic and eukaryotic express the fragment of A1AT gene, the fragment were amplified byPCR with primers designed according to the sequence of A1AT gene and inserted into pET-30a vectorfor expression in E.coli and pEGFP-N1vector for confocal assay respectively. The interaction betweenA1AT protein and VP60could be verified by immunoprecipitation test and HI test. The GST-polldowntest also indicated that VP60could interact with A1AT protein. Finally, with the help of confocal lasertechnology we verified the interaction between A1AT and VP60after pEGFP-N1-Msn andpcDNA3.1-VP60co-transfected into HEK293T cells.
     In summary, the proteomics analysis of rabbit Liver provides valuable insights into the interactionsof RHDV with its host and the investigations in pathogenesis of RHDV. Meanwhile, the results of theinteraction between VP60and A1AT in our studies would be facilitated further study of thepathogenesis of RHDV and Host-virus co-evolution.
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