CN103386129A - 作为鸡新城疫低毒力活疫苗LaSota株免疫佐剂的鞭毛蛋白及其应用 - Google Patents

作为鸡新城疫低毒力活疫苗LaSota株免疫佐剂的鞭毛蛋白及其应用 Download PDF

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CN103386129A
CN103386129A CN2013103208115A CN201310320811A CN103386129A CN 103386129 A CN103386129 A CN 103386129A CN 2013103208115 A CN2013103208115 A CN 2013103208115A CN 201310320811 A CN201310320811 A CN 201310320811A CN 103386129 A CN103386129 A CN 103386129A
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flagellin
newcastle disease
lasota
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焦新安
潘志明
王静
焦扬
张磊
孙林
李求春
陈祥
耿士忠
黄金林
殷月兰
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Yangzhou University
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Yangzhou University
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Abstract

本发明涉及一种具有佐剂效应的鼠伤寒沙门菌鞭毛蛋白,该鞭毛蛋白在沙门菌ATCC14028s(pTrc99a-fliC-WT)菌体表面表达而提取。该鞭毛蛋白作为鸡新城疫低毒力活疫苗LaSota株免疫佐剂,可有效增强疫苗的免疫应答。

Description

作为鸡新城疫低毒力活疫苗LaSota株免疫佐剂的鞭毛蛋白及其应用
技术领域
本发明涉及一种鞭毛蛋白作为鸡新城疫低毒力活疫苗LaSota株免疫佐剂,可有效增强疫苗的免疫应答。
背景技术
新城疫是由新城疫病毒(Newcastle disease virus,NDV)引起的一种禽类急性高度接触性传染病,严重威胁着养禽业。一般使用灭活苗和弱毒苗进行免疫预防,效果确实,在疾病的防控中发挥巨大的作用。
鞭毛蛋白是细菌鞭毛的主要结构蛋白,由4个球形结构域(D0,D1,D2和D3)构成,其中D0和D1结构域高度保守。胞外鞭毛蛋白被TLR5分子识别后,通过接头蛋白MyD88活化下游分子,最终激活NF-κB信号通路,在转录水平上调节多种前炎性因子基因的表达。研究表明,鞭毛蛋白作为固有免疫的诱导剂,诱导产生的固有免疫应答可启动针对外源抗原的获得性免疫应答,显示出鞭毛蛋白作为免疫佐剂的效应(Mizel SB,Bates JT.Flagellin as an adjuvant:cellular mechanisms and potential.The Journal of Immunology,2010,185(10):5677-5682)。最近研究显示,以沙门菌鞭毛蛋白作为佐剂,与禽流感病毒颗粒联合免疫后,可促进鸡产生更强的黏膜免疫应答(Chaung HC,Cheng LT,Hung LH,Tsai PC,Skountzou I,Wang B,Compans RW,Lien YY.Salmonella flagellin enhances mucosal immunity of avian influenza vaccine in chickens.Veterinary Microbiology,2012,157(1-2):69-77)。本实验室构建出沙门菌ATCC14028s(pTrc99a-fliC-WT),采用酸裂解提取该菌的鞭毛蛋白,与OVA混合免疫6-8周龄雌性C57BL/6小鼠,可提高OVA特异性抗体的水平(《一种可用作免疫佐剂的改良型鞭毛蛋白及其制备与应用》,中国专利申请,公开号:CN103044530A)。
发明内容
本发明的目的是将鞭毛蛋白作为一种佐剂,添加到商品化的鸡新城疫低毒力活疫苗LaSota株中,增强机体的免疫应答。
本发明所述的鞭毛蛋白,是从沙门菌ATCC14028s(pTrc99a-fliC-WT)中提取。宿主菌经IPTG诱导后,可在细菌表面长出重组鞭毛。经酸裂解法提取,可得到高纯度的野生型鞭毛蛋白(FliC),与商品化的鸡新城疫低毒力活疫苗LaSota株混合后,滴鼻免疫1周龄的SPF鸡,可提高新城疫抗体水平,具有良好的疫苗免疫佐剂应用前景。
附图说明
图1.SDS-PAGE分析重组鞭毛蛋白。M.蛋白Marker;1.FliC。
图2.3免14天后血清中IgG抗体水平。
图3.3免14天后血凝抑制抗体滴度。
具体实施方式
一、沙门菌鞭毛蛋白的制备
沙门菌ATCC14028s(pTrc99a-fliC-WT)鞭毛蛋白的提取程序为:沙门菌ATCC14028s(pTrc99a-fliC-WT)单菌落接种10mL M-broth,37℃静置培养16~18h后以1:100比例将培养液转接种于500mL M-肉汤中,37℃静置培养16~18h;3000rpm离心收集细菌,PBS洗1次,20mL PBS重悬;使用1N HCl调pH至2.0,室温150rpm振荡30min裂解细菌;10000rpm,离心20min去除细菌碎片;取上清18000rpm,离心l h,去除杂质;上清用1N NaOH溶液调pH至7.2;冰浴条件下,将上清置于磁力搅拌器上缓缓加入饱和硫酸铵,至饱和度达到67%。之后,4℃过夜,15000rpm离心30min;5mL PBS重悬沉淀,在PBS缓冲液中4℃透析48h,每隔12h换一次PBS缓冲液;蛋白经SDS-PAGE分析,大小约为50KD(图1)。应用ProteoSpinTMEndotoxin Removal Maxi试剂盒去除所提取鞭毛蛋白的内毒素。
二、疫苗
商品化的鸡新城疫低毒力活疫苗LaSota株(兽药生字(2011)170262007,批号20120102),由武汉中博生物股份有限公司生产。
三、动物免疫及抗体检测
1.动物免疫
将1周龄的SPF鸡分为3组,每组8只,滴鼻免疫,共免疫3次,每次免疫间隔时间为14d。免疫剂量分别为:LaSota疫苗免疫组(0.05mL/羽),LaSota+FliC免疫组(LaSota疫苗0.05mL+FliC50μg/羽),PBS空白对照组(0.05mL/羽)。于三免后4周进行翅静脉采血,制备血清样品,检测血清中NDV特异性IgG抗体水平和血凝抑制抗体滴度。
2.血清样品NDV特异性IgG抗体检测
用ELISA检测血清样品抗体:将LaSota病毒原液稀释28倍,100μL/孔,4℃包被过夜,用0.05%PBST洗板3次后,以每孔加入200μL含有1%BSA的PBS4℃封闭过夜;同上洗板4次后,每孔加入100μL血清样品,37℃作用2h,同上洗板5次后,每孔加入1:10000稀释的兔抗鸡HRP-IgG,37℃作用1h,同上洗板6次后,OPD显色,2M H2SO4终止液,酶标仪测定OD492nm值。结果显示,三免后14d,LaSota+FliC免疫组的NDV特异性IgG抗体水平显著高于LaSota疫苗免疫组(P<0.05)(图2)。
3.血凝抑制(HI)抗体检测
根据LaSota病毒血凝价制备4单位病毒,即将病毒原液稀释29倍;于96孔微量反应板上每孔加25μL PBS;第一孔加被检血清(LaSota疫苗组、LaSota+FliC组、PBS组)25μL,混合均匀,再吸取25μL液体小心地移至第2孔,如此连续稀释至第10孔,最后第10孔吸取25μL液体弃掉;被检血清稀释倍数依次为1:2~1:1024,第12孔为红细胞对照;每孔再加入含有4单位的病毒液25μL至第11孔,第12孔为红细胞对照孔,不加病毒液;置振荡器上振荡10s后,放4℃静置30min;每孔再加入1.0%红细胞悬浮液25μL,放振荡器上振荡10s混匀,置37℃,15min后判定结果。结果显示,三免后14d,LaSota+FliC免疫组的血凝抑制抗体滴度均显著高于LaSota疫苗免疫组(P<0.05)(图3)。

Claims (2)

1.一种具有佐剂效应的鼠伤寒沙门菌鞭毛蛋白,该鞭毛蛋白在沙门菌ATCC14028s(pTrc99a-fliC-WT)菌体表面表达而提取。
2.一种鸡新城疫低毒力活疫苗免疫佐剂的应用,其特征在于,将权利1所述鞭毛蛋白以50μg的剂量与商品化的鸡新城疫低毒力活疫苗LaSota株混合后,通过滴鼻途径免疫。
CN2013103208115A 2013-07-26 2013-07-26 作为鸡新城疫低毒力活疫苗LaSota株免疫佐剂的鞭毛蛋白及其应用 Pending CN103386129A (zh)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN104328136B (zh) * 2014-10-03 2018-04-17 哈尔滨博翱生物医药技术开发有限公司 鸡新城疫病毒毒株rClone30‑fliC的制备及其在鸡新城疫病防治中的应用
CN111875699A (zh) * 2020-07-03 2020-11-03 江南大学 一种提高枯草芽孢杆菌卵清蛋白表达量的方法

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EP1755668A2 (en) * 2004-05-07 2007-02-28 Hans-Gustaf Ljunggren Adjuvants

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EP1755668A2 (en) * 2004-05-07 2007-02-28 Hans-Gustaf Ljunggren Adjuvants

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104328136B (zh) * 2014-10-03 2018-04-17 哈尔滨博翱生物医药技术开发有限公司 鸡新城疫病毒毒株rClone30‑fliC的制备及其在鸡新城疫病防治中的应用
CN111875699A (zh) * 2020-07-03 2020-11-03 江南大学 一种提高枯草芽孢杆菌卵清蛋白表达量的方法
CN111875699B (zh) * 2020-07-03 2022-07-05 江南大学 一种提高枯草芽孢杆菌卵清蛋白表达量的方法

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Application publication date: 20131113