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ID:34120541
大小:3.81 MB
页数:40页
时间:2019-03-02
《犬gm-csf对犬细小病毒vp2 dna疫苗免疫增强作用的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、河北农业大学硕士学位论文犬GM--CSF对犬细小病毒VP2DNA疫苗免疫增强作用的研究姓名:贾启恒申请学位级别:硕士专业:基础兽医学指导教师:仲飞20120531摘要粒细胞.巨噬细胞集落刺激因子(GM.CSF)是由T细胞、B细胞、内皮细胞、成纤维细胞、巨噬细胞等分泌产生的,是重要的造血生长因子和免疫调节因子,能促进前体细胞的存活、增殖、分化,促进粒细胞和单核/巨噬细胞分化与形成集落。GM.CSF具有招募树突状细胞(DC)、单核细胞等抗原递呈细胞到抗原注射位点的功能,同时在促进树突状细胞前体细胞分化中起着关键作
2、用。因此GM.CSF被认为是一个新一代高效的分子免疫佐剂。犬细小病毒基因组编码的VP2蛋白是该病毒重要的结构蛋白和抗原蛋白。利用VP2基因制备的DNA疫苗能够刺激机体产生免疫应答反应。为进一步提高VP2DNA疫苗的免疫活性,本实验利用犬粒细胞.巨噬细胞集落刺激因子基因作为生物佐剂其对犬细小病毒VP2DNA疫苗的免疫增强作用。首先通过RT-PCR方法从犬淋巴细胞中扩增GM.CSF基因,并将其插入到pcDNA3.1载体上,分别构建该基因的两个真核表达载体:不融合标签的表达载体pcDNA—cGM.CSF和与Myc.
3、His融合的表达载体pcDNA.cGM.CSF/MH。用pcDNA·cGM—CSF/MH载体转染HEK293T细胞进行瞬时表达,通过Western.blot试验证明GM—CSFI~范够在真核细胞中进行分泌表达。然后用本室构建的犬细小病毒VP2基因表达载体与pcDNA-cGMCSF共同免疫小鼠(pcDNA3.1空载体作为阴性对照)。免疫后用ELISA方法检测不同时间小鼠血清的抗体滴度。用MTT法检测小鼠免疫后35d淋巴细胞的增殖活性,同时用ELISA试剂盒检Nd,鼠淋巴细胞Y干扰素的表达水平。结果表明,本实验构
4、建的表达载体能够介导重组GM.CSF在真核细胞中进行分泌表达。免疫实验表明,利用GM.CSF基因与VP2基因共免疫小鼠,抗体的水平显著高于VP2基因单免疫组(P5、cementGraduateStudent:JiaqihengSupervisor:ZhongFeiMajor:BasicVeterinaryMedicineAbstractGranulocyte-macrophagecolony—stimulatingfactor(GM—CSF)issecretedbyTcells,Bcells,endothelialcells,fibroblasts,macrophages.GM—CSFiskindofimportanthematopoieticgrowthfactora6、ndimmuneregulatingfactorwhichcouldimprovethesurvival,proliferation,differentiationofprecursorcellanddifferentiation,coloniesformationofgranulocytesandmonocytes/macrophages.GM—CSFcouldattracteddendriticcells.monocytesandotherantigen-presentingcellstotheantig7、eninjecfionpositionandplaysakeyroleinthedifferentiationofprecursorcells.Therefore,GM—CSFisconsideredanewhighmolecularadjuvant.VP2protein,encodedbycanineparvovirus(CPV)genome,isamajorstructuralproteinandepitope.nleDNAvaccinederivedfromtheVP2genecanstimulatet8、heimmuneresponsestoCPV.ToenhancetheVP2genevaccinepotency,thedoggranulocyteandmacrophagecolony—stimulatingfactor(GM—CSF)genewasusedasabiologicaladjuvant.GM··CSFgenewasamplifiedbyRT··PCRfromdogspleenlymp
5、cementGraduateStudent:JiaqihengSupervisor:ZhongFeiMajor:BasicVeterinaryMedicineAbstractGranulocyte-macrophagecolony—stimulatingfactor(GM—CSF)issecretedbyTcells,Bcells,endothelialcells,fibroblasts,macrophages.GM—CSFiskindofimportanthematopoieticgrowthfactora
6、ndimmuneregulatingfactorwhichcouldimprovethesurvival,proliferation,differentiationofprecursorcellanddifferentiation,coloniesformationofgranulocytesandmonocytes/macrophages.GM—CSFcouldattracteddendriticcells.monocytesandotherantigen-presentingcellstotheantig
7、eninjecfionpositionandplaysakeyroleinthedifferentiationofprecursorcells.Therefore,GM—CSFisconsideredanewhighmolecularadjuvant.VP2protein,encodedbycanineparvovirus(CPV)genome,isamajorstructuralproteinandepitope.nleDNAvaccinederivedfromtheVP2genecanstimulatet
8、heimmuneresponsestoCPV.ToenhancetheVP2genevaccinepotency,thedoggranulocyteandmacrophagecolony—stimulatingfactor(GM—CSF)genewasusedasabiologicaladjuvant.GM··CSFgenewasamplifiedbyRT··PCRfromdogspleenlymp
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