抗人β-HCG单克隆抗体的制备及化学发光检测方法的建立

目的:制备人绒毛膜促性腺激素(β-HCG)单克隆抗体,建立人β-HCG双抗体夹心CLIA检测方法。方法:用人β-HCG抗原免疫小鼠,通过细胞融合、筛选后得到杂交瘤细胞株,然后将细胞株扩大培养并纯化上清液获得抗体,测定抗体亲和力、特异性及表位,最后建立双抗体夹心CLIA方法。结果:获得4株抗人β-HCG的杂交瘤细胞株(β-1-1、β-2-1、β-3-1、β-4-1)。用β-1-1和β-2-1建立的双抗体夹心法的检测范围为0.5 mIU/mL-800 mIU/mL,灵敏度0.23 mIU/mL,检测结果的相对偏差均在±10%内,回收率在90%以上。结论:本研究最终成功制备了抗人β-HCG mAb,建立了定量检测人β-HCG的双抗体夹心CLIA方法,为β-HCG检测及疾病的诊断奠定基础。     

抗人β-BCG单克隆抗体的制备及化学发光检测方法的建立

目的：制备人绒毛膜促性腺激素（β-HCG）单克隆抗体,建立人β-HCG双抗体夹心CLIA检测方法。方法：用人β-HCG抗原免疫小鼠,通过细胞融合、筛选后得到杂交瘤细胞株,然后将细胞株扩大培养并纯化上清液获得抗体,测定抗体亲和力、特异性及表位,最后建立双抗体夹心CLIA方法。结果：获得4株抗人β-HCG的杂交瘤细胞株（β-1—1、β-2—1、β-3—1、β-4—1）。用β-1—1和β-2—1建立的双抗体夹心法的检测范围为0．5mlU／mL．800mlU／mL,灵敏度0．23mIU／mL,检测结果的相对偏差均在±10％内,回收率在90％以上。结论：本研究最终成功制备了抗人β-HCGmAb,建立了定量检测人β-HCG的双抗体夹心CLIA方法,为β-HCG检测及疾病的诊断奠定基础。     

抗人甲状腺球蛋白单克隆抗体的制备

目的:制备分泌特异性抗人甲状腺球蛋白(thyroglobulin,Tg)单克隆抗体的杂交瘤细胞株,为建立高灵敏度的Tg检测方法做准备。方法:以天然人源甲状腺球蛋白为抗原经皮下免疫BALB/c小鼠,通过细胞融合制备分泌抗人甲状腺球蛋白单克隆抗体,并对其进行特异性鉴定,建立检测Tg的双抗体ELISA(enzyme-linked immunosorbent assay)夹心法。结果:获得7株可稳定分泌抗人甲状腺球蛋白单克隆抗体的杂交瘤细胞株,经ELISA鉴定,筛选抗体可与Tg抗原有良好的特异性反应。建立的双抗体夹心ELISA方法敏感性可达1 ng/mL。结论:成功制备了抗人Tg单克隆抗体并建立了检测人Tg双抗体夹心ELISA方法,为进一步研发Tg快速诊断试剂盒提供了原料。     

hGH单克隆抗体的筛选及双抗体夹心ELISA检测方法的建立

采用杂交瘤法制备单克隆抗体,并用辛酸-硫酸铵法纯化单抗,通过ELISA方法和Western blotting测定抗体的效价与特异性,并进行抗体类型、相对亲和力测定;应用纯化的单抗建立hGH双抗体夹心ELISA检测方法。筛选出两株可以稳定分泌抗hGH单抗的杂交瘤细胞株,分别命名为3E11、2G9,抗体类型均为IgG1,抗体滴度均可达10-10,特异性好,相对亲和力高,以筛选到的两株单抗建立的双抗夹心ELISA法线性范围为0.09～1.5625ng/mL,R2>0.9,灵敏度为0.09ng/mL。筛选出高效抗hGH的单抗,并建立了hGH双抗体夹心ELISA检测方法。     

抗HLJ1单克隆抗体的制备及抗原检测方法的建立

为制备抗人肝脏DnaJ-like蛋白(Human liver DnaJ-like protein, HLJ1)的单克隆抗体, 并建立免疫组化和双抗体夹心ELISA检测HLJ1的方法。采用淋巴细胞杂交瘤技术, 获得两株能稳定分泌抗HLJ1单克隆抗体的杂交瘤细胞株A4C7和 C4C8。经鉴定, 两株单抗的亚类均为IgG1, 并且效价高、特异性好。以单抗A4C7和C4C8作为一抗, 对人胎肝组织石蜡切片进行免疫组化染色, 结果表明, 两株单抗均为阳性染色, 且HLJ1主要定位于胎肝细胞的胞浆。选取A4C7进行HRP酶标记, 并以HRP- A4C7作为酶标抗体, 以C4C8作为包被抗体, 建立双抗体夹心ELISA方法, 并进行棋盘滴定确定抗体的最佳工作浓度。该检测方法的线性范围是15~750 ng/mL, 灵敏度下限达15 ng/mL, 特异性良好。所建立的免疫组化和双抗体夹心ELISA 法可用于快速、灵敏地检测组织及血清中的HLJ1蛋白, 为HLJ1的肿瘤相关性研究提供了有力的工具。     

抗Dysbindin-1多肽双抗夹心ELISA的建立及在肝癌中的应用

目的:制备抗人Dysbindin-1特异性单克隆抗体,建立DAS-ELISA检测体系,并初步应用于肝癌血清的检测。方法:采用合成免疫原免疫BALB/c小鼠,通过杂交瘤技术制备抗Dysbindin-1单克隆抗体,用HRP标记单克隆抗体,ELISA和SDS-PAGE电泳法检测抗体的亚类、滴度;采用DAS-ELISA技术制备Dysbindin-1检测试剂盒,检测正常、肝硬化及肝癌患者各30例血清并比较其差异。结果:细胞融合后获得了4株稳定产生抗Dysbindin-1单克隆抗体的杂交瘤细胞株(1C6A11、1E8H3、2D1C11、5B6D4),抗体亚类分别为IgG2b,IgG2b,IgG1和IgG2a,杂交瘤细胞诱生的腹水抗体效价达106以上,通过抗体配对实验筛选确定2D1C11作为包被抗体,1E8H3作为酶标抗体。该ELISA方法线性范围为62.5-1000ng/mL,检测限为62.5ng/mL;应用该方法检测显示正常组与肝硬化组及肝癌组间差异显著(P0.001),Dysbindin-1诊断肝癌的敏感性和特异性分别为90%和93.3%。结论:Dysbindin-1可以成为新的候选的肝癌血清标志物,抗Dysbindin-1多肽双抗夹心ELISA体系可以初步应用于肝癌的早期诊断。     

抗Trx单克隆抗体用于血吸虫病诊断的研究

目的：建立双抗体夹心ELISA 法检测日本血吸虫硫氧还蛋白（Thioredoxin,Trx）。方法：用重组日本血吸虫Trx（rTrx）蛋白免疫BALB/c 小鼠,筛选高滴度、高特异性的单克隆抗体建立双抗体夹心ELISA法。通过检测日本血吸虫排泄- 分泌物（excretorysecretions,ES）与rTrx的浓度评价该方法的敏感性;通过对健康人血清的检测确定其特异性;通过对布氏姜片吸虫病、华支睾吸虫病、卫氏并殖吸虫病、囊虫病患者血清进行交叉反应试验,评价该方法的特异性。结果：获得2 株稳定分泌抗rTrx 蛋白单克隆抗体的杂交瘤细胞株,命名为McTrx1 和McTrx2。以McTrx1 为包被抗体,HRP-McTrx2 为酶标抗体,建立的双抗体夹心ELISA 可检测出ES的最低浓度为4.8 μg/ml,检测出rTrx 的最低浓度为1.2 滋g/ml。该方法的特异性为96 %。结论：以抗rTrx 蛋白单克隆抗体McTrx1 与McTrx2为基础建立的双抗体夹心ELISA 法具有较高的特异性。     

汉滩病毒PS-6单克隆抗体的制备及其双抗体夹心ELISA检测方法的建立与应用

目的 制备汉滩病毒(Hantaan virus, HTNV)PS-6株小鼠单克隆抗体(monoclonal antibody, mAb),建立HTNV抗原双抗体夹心ELISA检测方法,验证方法的检测性能并初步应用于疫苗抗原含量检测。方法 以HTNV PS-6株灭活全病毒原液作为免疫原,采用小鼠杂交瘤融合技术,筛选mAb杂交瘤细胞株,制备mAb;用间接ELISA测定mAb效价;用Western blot鉴定mAb特异性;用间接ELISA测定mAb相对亲和力;经抗体配对筛选,建立双抗体夹心ELISA病毒抗原检测方法。以I型肾综合征出血热疫苗标准品作为定量标准,验证该方法的检测限、线性范围、特异性、准确度、精密度;对6批次I型肾综合征出血热灭活疫苗原液进行检测,初步验证该方法的适用性。结果 获得4株稳定分泌抗HTNV PS-6特异性抗体的阳性杂交瘤细胞株：4B2、3H8、5D7及2A7;间接ELISA检测腹水抗体效价均在1×10⁶～1×106～1×10⁷;Western blot鉴定4株mAb均能特异性识别HTNV PS-6;相对亲和力为4B2>5D7>3H8>2A7;抗体ELISA配对筛选后,选用5D7作为包被抗体,4B2作为标记抗体,包被抗体工作浓度为10μg/mL,HRP标记抗体工作浓度为1∶5 000。该方法对HTNV PS-6抗原检测限为0.039 1μg/mL;检测线性范围为0.078 1～2.500 0μg/mL,R7;Western blot鉴定4株mAb均能特异性识别HTNV PS-6;相对亲和力为4B2>5D7>3H8>2A7;抗体ELISA配对筛选后,选用5D7作为包被抗体,4B2作为标记抗体,包被抗体工作浓度为10μg/mL,HRP标记抗体工作浓度为1∶5 000。该方法对HTNV PS-6抗原检测限为0.039 1μg/mL;检测线性范围为0.078 1～2.500 0μg/mL,R²> 0.97;检测与I型肾综合征出血热疫苗生产主要原辅料成分、II型肾综合征出血热疫苗、森林脑炎疫苗及甲肝疫苗均无交叉反应;准确度验证,病毒抗原回收率在95.8%～110.5%之间;试验内和试验间精密度,CV分别在6.72%～8.03%、8.24%～9.70%之间。用该方法检测6批次I型肾综合征出血热灭活疫苗原液,结果均呈剂量依赖性。结论 成功制备HTNV PS-6株mAb,建立病毒抗原双抗体夹心ELISA抗原检测方法,方法准确、可靠,可初步应用于I型肾综合征出血热灭活疫苗科研、生产过程病毒抗原检测。     

抗 Trx 单克隆抗体用于血吸虫病诊断的研究 *

摘要 目的： 建立双抗体夹心 ELISA 法检测日本血吸虫硫氧还蛋白 （Thioredoxin,Trx ）。方法： 用重组日本血吸虫 Trx （rTrx ） 蛋白免 疫 BALB/c 小鼠, 筛选高滴度、 高特异性的单克隆抗体建立双抗体夹心 ELISA 法。通过检测日本血吸虫排泄 - 分泌物 （ excretorysecretions,ES ） 与 rTrx 的浓度评价该方法的敏感性; 通过对健康人血清的检测确定其特异性; 通过对布氏姜片吸虫病、 华支睾吸虫 病、 卫氏并殖吸虫病、 囊虫病患者血清进行交叉反应试验, 评价该方法的特异性。 结果： 获得 2 株稳定分泌抗 rTrx 蛋白单克隆抗体 的杂交瘤细胞株, 命名为 McTrx1 和 McTrx2。以 McTrx1 为包被抗体, HRP-McTrx2 为酶标抗体, 建立的双抗体夹心 ELISA 可检 测出 ES 的最低浓度为 4.8 μg/ml, 检测出 rTrx 的最低浓度为 1.2 μg/ml。 该方法的特异性为 96%。 结论： 以抗 rTrx 蛋白单克隆抗体 McTrx1 与 McTrx2 为基础建立的双抗体夹心 ELISA 法具有较高的特异性。     

抗嗜肺军团菌血清8型单克隆抗体的制备及双抗体夹心酶联免疫吸附试验检测法的建立

目的：制备针对嗜肺军团茵血清8型的单克隆抗体,并建立双抗体夹心酶联免疫吸附试验（ELISA）检测方法。方法：用甲醛灭活的嗜肺军团菌血清8型菌免疫BALB／c小鼠,采用杂交瘤技术制备抗嗜肺军团菌血清8型单克隆抗体,建立双抗夹心ELISA检测方法。结果：研制出8株能特异性分泌抗嗜肺军团菌血清8型单克隆抗体的杂交瘤细胞株,Ig类型分别为IgM（2株）、IgG,（1株）和IgG,（5株）;利用IgG1型单抗6G10与6C7配对,建立了双抗夹心ELISA检测方法,该方法的最低检出浓度为2．6×10^5cfu／mL,除与金黄色葡萄球菌有微弱的交叉反应外,与14株其他血清型嗜肺军团菌、17株非嗜肺军团菌及11株非军团菌均无交叉反应,具有较高的特异性。结论：制备了具有高特异性和亲和力的抗嗜肺军团菌血清8型单克隆抗体,并建立了双抗夹心EUSA检测方法。     

单克隆抗体与多克隆抗体配对ELISA方法比较

以人绒毛膜促性腺激素(HCG)为抗原,制备出对HCG的多克隆抗体和特异性单克隆抗体,并进行抗体纯化和特性分析,利用辣根过氧化物酶(HRP)分别对其进行了标记.采用双抗夹心ELISA试验,探讨了多克隆抗体与单克隆抗体配对的若干事项.结果表明,利用单克隆抗体和酶标多克隆抗体配对,并用含动物血清的稀释液稀释酶标抗体,可实现对检测原的高特异性和高灵敏度检测.     

Sensitive reagentless electrochemical immunosensor based on an ormosil sol-gel membrane for human chorionic gonadotrophin

A new organically modified silicate (ormosil) material was synthesized as a matrix to encapsulate enzyme labeled antibody for preparation of immunosensors. The ormosil matrix was prepared by hydrolyzing tetraethyoxysilane and (3-aminopropyl)triethoxysilane in weak alkali solution. It possessed three-dimensional ordered nanoporous structure with high electrical conductivity and good mechanical stability. Its hydrophilicity provided a microenvironment for retaining the biological activity of the immobilized protein. Particularly, using horseradish peroxidase-labeled human chorionic gonadotrophin antibody (HRP-anti-hCG) as a model, the immobilized HRP showed direct electron transfer at about −35 mV with a rate constant of 15.8 ± 3.8 s⁻¹. By a simple one-step immunoreaction between human serum chorionic gonadotrophin (hCG) in sample solution and the immobilized HRP-anti-hCG, the differential pulse voltammetric peak current of HRP decreased linearly with an increasing hCG concentration from 0.5 to 50 mIU/ml with a relatively low limit of detection of 0.3 mIU/ml at 3σ. Excellent analytical performance, fabrication reproducibility and operational stability of the proposed biosensor indicated its promising application in clinical diagnostics.     

血栓调节蛋白化学发光免疫分析检测方法的建立*

目的:建立并评价基于板式化学发光免疫分析(CLIA)平台的血栓调节蛋白(TM)定量检测方法。方法:以链霉亲和素包被微孔板,加入待检血浆,偶联生物素和辣根过氧化物酶的配对抗体组成分析体系,采用双抗体夹心模式,建立TM抗原定量检测方法,并对其进行条件优化和性能评价。结果:生物素化抗体和酶标抗体的工作浓度分别为0.5 μg/mL和0.75 μg/mL,加样后的孵育时间选为15 min,最低检测限为0.2 TU/mL,该检测方法的检测范围为1~200 TU/mL,批间和批内精密度(CV)均小于8%,37 ℃ 10天稳定性良好,207份临床血浆测值与希森美康测值相关性较高(R²>0.96)。结论:建立了TM板式化学发光定量检测方法,且各项性能指标良好,可满足临床检测的需要。     

Ultrasensitive electrochemical immunosensor based on Au nanoparticles dotted carbon nanotube-graphene composite and functionalized mesoporous materials

A facile and sensitive electrochemical immunosensor for detection of human chorionic gonadotrophin (hCG) was designed by using functionalized mesoporous nanoparticles as bionanolabels. To construct high-performance electrochemical immunosensor, Au nanoparticles (AuNPs) dotted carbon nanotubes (MWCNTs)-graphene composite was immobilized on the working electrode, which can increase the surface area to capture a large amount of primary antibodies (Ab(1)) as well as improve the electronic transmission rate. The as-prepared bionanolabels. composed of mesoporous silica nanoparticles (MCM-41) coated with AuNPs through thionine linking, showed good adsorption of horseradish peroxidase-labeled secondary anti-hCG antibody. Interlayer thionine was not only a bridging agent between MCM-41 and AuNPs but also an excellent electron mediator. The approach provided a good linear response range from 0.005 to 500 mIU mL(-1) with a low detection limit of 0.0026 mIU mL(-1). The immunosensor showed good precision, acceptable stability and reproducibility. Satisfactory results were obtained for determination of hCG in human serum samples. The proposed method provides a new promising platform of clinical immunoassay for other biomolecules.     

Reagentless amperometric immunosensor for human chorionic gonadotrophin based on direct electrochemistry of horseradish peroxidase

A novel amperometric immunosensor for determination of human serum chorionic gonadotrophin (HCG) was constructed by immobilization of HCG with titania sol-gel on a glassy carbon electrode and the direct electrochemistry of horseradish peroxidase (HRP) labeled to HCG antibody (HRP-anti-HCG). The morphologies of the HCG membrane were characterized to be chemically clean, porous and homogeneous. HRP-anti-HCG was functionally conjugated with the immobilized HCG after incubation in phosphate buffer (PBS) containing HRP-anti-HCG. A direct electron transfer of HRP with a rate constant of 1.35+/-0.40 s(-1) was observed at the HRP-anti-HCG-HCG/titania sol-gel membrane modified electrode in 0.1 M PBS pH 7.0. With a competitive mechanism the differential pulse voltammetric peak current of the immobilized HRP decreased linearly with an increasing HCG concentration from 2.5 to 12.5 mIU/ml in the incubation solution. The HCG immunosensor showed a detection limit of 1.4 mIU/ml, a good accuracy and acceptable precision and reproducibility with an intra-assay CV of 4.7% at 5.0 mIU/ml and an inter-assay precision of 8.1% obtained at 10 mIU/ml. The biosensor displayed a good stability in a storage period of 30 days.     

子痫前期循环系统标志物sFlt-1的重组表达及化学发光检测方法的建立

目的：表达可溶性fms样酪氨酸激酶-1(soluble fms-like tyrosine kinase-1,sFlt-1)重组蛋白,建立针对sFlt-1的化学发光检测方法。方法：构建pcDNA3.4-sFlt-1-His*6表达载体,转染至HEK293细胞进行重组表达。利用链霉亲和素-生物素亲和体系及双抗体夹心法,实现对sFlt-1的定量检测。结果：该方法的最低检测限为2 pg/mL,线性范围为20～40 000 pg/mL,平均回收率为92%,批内及批间精密度变异系数(variable coefficient, CV)均小于10%,与珀金埃尔默sFlt-1检测试剂盒进行比对的相关系数R²为0.925 2。结论：获得了具有天然生物活性的sFlt-1蛋白,建立了具有良好性能的sFlt-1检测方法,后续进一步开发可应用于子痫前期的诊断筛查。     

Distribution of intact and Fab1 2 fragments of anti-human chorionic gonadotrophin antibodies in nude mice bearing human choriocarcinoma xenografts

Summary A direct comparative study of the distribution of intact and Fab¹ ₂ fragments of mouse monoclonal anti-human chorionic gonadotrophin antibody, W14A, in nude mice bearing a human choriocarcinoma xenograft, indicates that the tumour:blood ratio is generally improved with fragments. Some parameters which may determine the distribution are outlined.     

Cadmium ion-doped magnetic poly(styrene-acrylic acid) nanospheres for sensitive electrochemical immunoassay

A novel class of molecular tags, cadmium ion-doped magnetic poly(styrene-acrylic acid) nanospheres (Cd-MPSA), was first synthesized and functionalized with polyclonal rabbit anti-human luteinizing hormone antibodies (PAb(2)) for highly efficient electrochemical immunoassay of luteinizing hormone (LH). Transmission electron microscope (TEM) and Fourier transform infrared spectroscope (FTIR) were employed to characterize the prepared Cd-MPSA. By using Cd-MPSA-labeled PAb(2) as molecular tags, a novel sandwich-type immunoassay protocol was built for determination of LH on monoclonal mouse anti-human luteinizing hormone antibody (MAb(1))-functionalized gold electrode. The assay was carried out in pH 5.3 HAc-NaAc buffer solution by square wave voltammetry (SWV). The signal was obtained by the reduction of the doped cadmium ions in the Cd-MPSA. Under optimal conditions, the currents increased with the increasing LH level in the sample, and exhibited a linear range from 0.25 to 240 mIU mL(-1) with a detection limit of 0.08 mIU mL(-1) LH at 3s(B). The precision, reproducibility, and specificity were acceptable. No obvious difference was encountered in the analysis of spiking LH samples into newborn calf serum with the referenced values.