分泌型mB7-H4-hIg重组融合蛋白定量检测方法的建立和应用

目的建立双抗体夹心ELISA方法,定量检测重组小鼠共抑制分子B7-H4(mB7-H4)-人IgGα1 Fc段融合蛋白(mB7-H4-hIg)的分泌型表达。方法将表达mB7-H4-hIg的真核表达载体pmB7-H4-Fc转染COS-7细胞,并将该载体注入小鼠体内,制备重组mB7-H4-hIg融合蛋白,以羊抗人IgG为包被抗体,HRP标记的羊抗人lgG为检测抗体,通过配对实验、方阵滴定实验及绘制hlgG浓度与A450的标准曲线,建立定量检测重组mB7-H4-hlg融合蛋白双抗体夹心ELISA法。结果建立了双抗体夹心ELISA方法,检测的线性范围为10～500ng/ml。标准曲线的回归方程为:y=0.0028x+0.0899,R2=0.9762,P<0.05.应用该方法可快速检测体外和体内表达的重组mB7-H4-hlg融合蛋白的分泌量。结论建立了一种可快速定量检测重组mB7-H4-hlg融合蛋白分泌表达的双抗体夹心ELISA法。     

登革病毒非结构蛋白NS1群特异性单克隆抗体的制备及初步应用

目的制备登革病毒NS1群特异性单克隆抗体,建立可检测登革病毒1～4型NS1抗原的ELISA检测法,为登革热的早期快速诊断奠定基础。方法应用毕赤酵母表达系统分泌表达登革病毒2型重组非结构蛋白NS1,以此为抗原免疫BABL/c小鼠,取其脾细胞与小鼠骨髓瘤细胞融合,经HAT选择培养、间接ELISA筛选和亚克隆,获得能稳定分泌登革病毒NS1群特异性单克隆抗体的杂交瘤细胞株;用所获得的单克隆抗体建立可检测1～4型登革病毒NS1抗原的双抗体夹心ELISA法。结果从登革病毒2型NS1重组毕赤酵母（Pichia Pastoris-NS1）中获得了大量纯化的登革病毒重组NS1蛋白;经免疫小鼠、细胞融合、间接ELISA筛选及3次亚克隆后,最终获得2株能高效分泌抗登革病毒NS1单克隆抗体的杂交瘤细胞株2D7B6B4和2D10E2F6,间接ELISA显示抗体效价高达1∶8000～1∶16000;ELISA及免疫荧光检测证实,其所分泌的抗体与1～4型登革病毒及其重组NS1蛋白均有特异性免疫反应,为登革病毒NS1群特异性单克隆抗体;两株单克隆抗体均为IgG2a亚类;初步建立了检测4个血清型登革病毒NS1抗原的双抗体夹心ELISA法。结论成功研制出两株能高效分泌抗登革病毒NS1群特异性单克隆抗体的杂交瘤细胞株。初步建立了可检测1～4型登革病毒NS1抗原的双抗体夹心ELISA检测法。     

脑钠肽单克隆抗体的制备及临床应用研究

目的:制备抗脑钠肽(BNP32)单克隆抗体(mAb),并利用双抗体夹心ELISA法建立BNP抗原检测技术,应用于临床心脏患者脑钠肽水平的检测。方法:以基因工程原核重组表达BNP抗原免疫BALB/c小鼠,利用常规杂交瘤技术制备mAb,mAb经纯化和HRP标记后,利用双抗体夹心ELISA法筛选检测BNP32蛋白的最佳配对mAb,以其建立BNP32抗原检测技术,并与临床BNP检测的标准实验做平行比较。结果:成功筛选到16株稳定分泌抗BNP32mAb的杂交瘤细胞株,16株mAb的亚型分别为IgG1、IgG2a和IgM,并从中筛选出最佳mAb配对组合,该组合对BNP32蛋白的检测灵敏度为20ng/L。建立的双抗体夹心BNP检测ELISA法与临床BNP检测的标准实验平行比较具有很好的一致性(kappa值=0.828),两者没有统计学意义(P0.05)。结论:成功地建立了BNP32抗原的双抗体夹心ELISA法检测技术,并能够很好地运用于临床心衰患者BNP指标的检测。     

重组人碱性成纤细胞生长因子单克隆抗体的制备、鉴定及初步应用

目的制备重组人碱性成纤维细胞生长因子(recombinant human basic fibroblast growth factor,rhbFGF)单克隆抗体,鉴定其特性,建立双抗体夹心ELISA检测方法。方法以rhbFGF为免疫原,免疫Balb/c小鼠,通过细胞融合技术建立能稳定分泌抗rhbFGF杂交瘤细胞株,制备抗rhbFGF单克隆抗体,采用Ig亚类ELISA试剂盒鉴定抗体亚类,间接ELISA法检测抗体效,Western blot鉴定抗体特异性。HRP标记McAb并建立夹心ELISA检测方法。结果获得2株(分别命名2D3、5F7)可分泌特异性McAb的强阳性细胞株,腹水抗体效价在10-5以上,IgG亚类均为IgG1,轻链为K链。Western blot证明2株McAb特异性良好,双抗体夹心ELISA检测rhbFGF最低检测限达到2 ng/ml。结论成功制备高效价的抗rhbFGF单克隆抗体,建立抗rhbFGF双抗体夹心ELISA定量检测方法。     

自制NSE单抗的鉴定及其双抗夹心ELISA方法的建立

目的:制备并鉴定NSE(Neuron-specific enolase)单克隆抗体,建立可检测NSE蛋白的双抗夹心ELISA方法。方法:用本实验室已表达纯化的NSE融合蛋白免疫BALB/c小鼠,采用杂交瘤技术制备单克隆抗体。采用WB、IP、IF、IHC等方法对获得的NSE单抗进行鉴定及亚型检测。利用辣根过氧化物酶标记纯化后的NSE单抗,建立一个可检测NSE蛋白的双抗夹心ELISA法。结果:通过分析和鉴定,选定2株可稳定分泌抗NSE抗体的杂交瘤细胞株,效价达4.2×107～6.5×107,亚型为IgG2b。免疫印迹结果显示,该抗体不仅能识别细胞内源NSE蛋白,还能识别分泌到细胞培养上清液中的NSE蛋白,此外还可用于免疫荧光及免疫组化检测。文中所建立的双抗夹心ELISA法,最低检测极限为8.85 ng/ml。结论:成功获得了效价高、灵敏度好及特异性强的NSE单抗,建立了一个双抗体夹心ELISA检测系统,具有良好的临床应用前景。     

Pfs25蛋白单克隆抗体的制备及双抗体夹心ELISA的建立

目的:制备恶性疟原虫子孢子囊表面膜蛋白Pfs25的单克隆抗体( mAb),建立检测Pfs25蛋白的双抗体夹心ELISA方法.方法:纯化毕赤酵母表达的重组Pfs25蛋白,并免疫BALB/c小鼠,采用骨髓瘤细胞Sp2/0与免疫BALB/c鼠脾细胞杂交的细胞融合技术,通过间接ELISA检测获得分泌抗Pfs25抗体的阳性杂交瘤细胞株,通过免疫F1鼠诱生腹水,纯化腹水,并进行mAb的各项生物学鉴定.辣根过氧化物酶(HRP)标记纯化后的抗体,以4B7为包被抗体,1B4为酶标抗体,建立了双抗体夹心ELISA法.结果:获得3株抗Pfs25的杂交瘤细胞株,其中2株有良好的稳定性和特异性.并建立了双抗体夹心ELISA检测法,检测有效范围在0.07～1 mg/mL,其检测灵敏度为41.6 ng/mL.结论:成功制备抗Pfs25蛋白的单克隆抗体,并建立了一种可用于Pfs25蛋白检测的双抗体夹心ELISA法,为Pfs25蛋白制备传播阻断型疟疾疫苗奠定了基础.     

检测人可溶性疱疹病毒侵入介体双抗体夹心ELISA的建立

目的:建立快速、灵敏的检测人可溶性疱疹病毒侵入介体(HVEM)双抗体夹心ELISA.方法:在获得HVEM重组蛋白的基础上,制备兔抗人HVEM多克隆抗体,以HVEM单克隆抗体(mAb)和HVEM多克隆抗体(pAb)为双抗体,建立双抗体夹心ELISA.结果:建立的检测人可溶性HVEM双抗体夹心ELISA最低检出限为3.91 μg/L,标准曲线范围7.81-250 μg/L,线性方程为y=0.0021x+0.1852,R2=0.9944.回收率在89.7％～92.8％之间,平均回收率为91.4％.批内变异系数＜1O％,批间变异系数＜15％.结论:建立的双抗体夹心ELISA快速、灵敏、简单,可满足实际工作需要.     

抗青霉素单克隆抗体的制备及初步应用

目的:制备抗青霉素的单克隆抗体(mAb)并建立双抗体夹心ELISA检测方法,对临床上引起青霉素过敏反应的过敏原青霉噻唑蛋白进行研究。方法:将半抗原青霉素和载体蛋白偶联后免疫BALB/c小鼠,应用杂交瘤技术建立稳定分泌抗青霉素mAb的杂交瘤细胞株。常规制备腹水,用辛酸-硫酸铵法纯化,并对纯化的mAb进行特异性鉴定。通过对不同抗体组合的分析和条件的优化,建立检测过敏原的双抗体夹心ELISA方法。结果:经细胞融合、筛选及克隆化,共获得9株稳定分泌抗青霉素mAb的杂交瘤细胞株,其中5株亲和力较高。建立了双抗体夹心ELISA相对定量检测方法,该方法灵敏度达到870 U/L,平均回收率为107.81%,批内变异系数平均为6.7%,批间变异系数平均为9.3%,可用于A群链球菌制剂中青霉噻唑蛋白的检测。结论:成功地制备了抗青霉素的mAb,并建立了相对定量检测青霉噻唑蛋白的双抗体夹心ELISA法。     

抗人白细胞介素15单克隆抗体的制备及特性鉴定

目的 :制备鼠抗人白细胞介素 15(hIL 15)单克隆抗体 (mAb) ,并鉴定其特性。方法 :自重组人白细胞介素 15(rhIL 15)基因工程菌中 ,提取融合蛋白GST IL 15,以 12 0g/LSDS PAGE分离鉴定 ,切取含有目的条带的凝胶 ,免疫BALB/c小鼠。取免疫小鼠的脾细胞与Sp2 / 0骨髓瘤细胞常规融合 ,依次进行HAT选择培养 ,间接ELISA法筛选抗体阳性的杂交瘤细胞及克隆化。对杂交瘤细胞株的稳定性及其分泌的mAb的特性进行鉴定。另外 ,以rhIL 15包涵体蛋白 (rhIL 15IBP)免疫新西兰白兔 ,制备抗hIL 15的多克隆抗体 (多抗 )。用抗hIL 15的mAb与多抗建立双抗体夹心间接ELISA。结果 :获得 1株可稳定分泌特异性抗hIL 15mAb的杂交瘤细胞。建立了双抗体夹心间接ELISA ,检测rhIL 15蛋白的敏感性达 10 μg/L。结论 :成功地制备抗hIL 15mAb ,并建立了一种可用于hIL 15检测的双抗体夹心间接ELISA。     

抗烟曲霉菌单克隆抗体鉴定和初步应用

目的 :制备抗烟曲霉菌单克隆抗体 (McAb) ,建立一种快速检测烟曲霉菌抗原方法。方法 :用基因重组烟曲霉菌半乳糖甘蛋白 (AFMP1)抗原 ,免疫BALB/c小鼠 ,制备单克隆抗体 ,选择针对不同抗原决定簇单抗配对 ,建立双抗夹心ELISA法检测烟曲霉菌抗原。结果 :筛选出 3株稳定分泌抗烟曲霉菌单抗杂交瘤细胞株 ,IgG亚类鉴定分别为IgG1、IgG2a、IgG2b ,抗体亲和常数分别为 1 2× 10 10 、4 5 6× 10 9和 1 81× 10 10 mol/L ,免疫印迹证实单抗特异性识别烟曲霉菌培养上清和细胞裂解产物 ,相加试验表明 3株单抗是针对不同抗原决定簇 ,组成配对双抗夹心ELISA法 ,检测最高灵敏度为 0 1ng/ml,可测范围为 0 1～ 6 0ng/ml。结论 :3株杂交瘤细胞株特异性好、亲和力高 ,组成配对夹心ELISA法可用于快速检测烟曲霉菌抗原。     

检测可溶性TREM-1的ELISA法的建立及初步应用

目的:建立定量检测可溶性TREM-1的抗体夹心ELISA法。方法:采用抗人TREM-1单克隆抗体(mAb)包被酶标板,以兔抗鼠TREM-1多克隆抗体为夹心抗体、HRP标记羊抗兔IgG为检测抗体、重组小鼠可溶性TREM-1为标准品,建立检测可溶性TREM-1的ELISA法,并对30例正常人和30例急性肺部感染患者血清样本进行了检测。结果:建立的夹心ELISA法检测TREM-1的线性范围为0.78～200μg/L,批内、批间变异系数分别为6.52%和9.46%。30例正常人和30例血清急性肺部感染患者TREM-1的含量分别为(0.69±0.18)μg/L和(1.16±0.42)μg/L,两者比较差异有统计学意义(P<0.001)。结论:成功建立了一种灵敏度高、稳定性好的检测可溶性TREM-1的抗体夹心ELISA法。     

A sandwich ELISA for the detection of Wnt5a

Wnt5a is a noncanonical member of the Wnt family of signaling molecules that has been linked to various physiological and pathological processes including cell differentiation, cell migration, cell growth, vascular remodeling, cancer and chronic inflammation. To understand the role of Wnt5a in these processes, it is necessary to determine the function and expression level of Wnt5a. In this study we developed a sensitive and specific sandwich enzyme-linked immunosorbent assay (ELISA) for detecting Wnt5a. We found that a rabbit anti-human Wnt5a is a suitable capture antibody for establishing a sandwich ELISA. We used two systems to detect Wnt5a: (1) goat anti-mouse Wnt5a and horseradish peroxidase (HRP) conjugated F(ab′)₂ donkey anti-goat IgG as detection and enzyme-linked antibodies respectively, or (2) biotinylated goat anti-mouse Wnt5a and HRP–streptavidin as detection antibody and enzyme-linked avidin respectively. A sandwich ELISA using either of these systems failed to detect recombinant mouse (rm)-Wnt5a diluted in Hank's balanced salt solution supplemented with Ca²⁺ and Mg²⁺ and 1% bovine serum albumin (HBBS+, 1% BSA). Addition of polyethylene glycol (PEG) to the HBBS+, buffer during the binding stage of rm-Wnt5a, afforded the detection of rm-Wnt5a. The use of PEG during both the binding of rm-Wnt5a and detection antibody stages of the assay yielded the maximum signal for rm-Wnt5a. The relationship between the ELISA signal and concentration of Wnt5a was linear with an R² of 0.9934. In summary, we have developed a specific and sensitive sandwich ELISA that detects rm-Wnt5a.     

Development of a tree shrew-specific interferon-gamma assay

Tree shrews (Tupaia belangeri) are small squirrel-like mammals closely related to primates. Due to their susceptibility to several human viruses, tree shrews have been proposed as potential animal models for the study of human viral infections. However, there are no standardized assays currently available for the detection of tree shrew-specific interferon (IFN)-γ, a major cytokine secreted during the antiviral immune response. Herein, we developed a novel enzyme-linked immunosorbent assay (ELISA) for the quantification of IFN-γ in tree shrew serum samples. Tree shrew-specific IFN-γ was expressed in Escherichia coli via fusion with glutathione S-transferase (GST-TS-IFN-γ) to obtain recombinant IFN-γ. To generate anti-IFN-γ monoclonal antibodies, mice were immunized with the GST-TS-IFN-γ recombinant fusion protein, and hybridoma cell lines were established. Similarly, anti-IFN-γ polyclonal antibodies were obtained from immunized rabbits, purified, and conjugated to horseradish peroxidase (HRP). Based on the results obtained from the antibody matching test, we optimized the monoclonal antibody (1:2000) and the HRP-conjugated polyclonal antibody (1:8000) as coating and detection antibodies, respectively. Titration curves were generated with recombinant IFN-γ to develop a sensitive sandwich ELISA; the lowest detection limit of the assay was 20 ng/mL. We also tested mitogen-stimulated tree shrew blood samples in this ELISA, and found significantly higher levels of IFN-γ in the stimulated versus the unstimulated samples. Most importantly, our ELISA system detected native IFN-γ in serum samples from 50 healthy tree shrews. We have thus developed a novel ELISA, and have demonstrated the first ELISA-based measurement of IFN-γ in tree shrew serum samples.     

检测人IL 37双抗夹心ELISA方法的建立

目的：建立定量检测人血清IL-37的双抗夹心ELISA。方法：以鼠抗人IL-37单抗作为捕获抗体,制备的兔抗人IL-37多抗作为检测抗体,HRP标记山羊抗兔IgG为二抗,重组人IL-37蛋白为标准品,建立检测人IL-37的双抗夹心ELISA方法。并对该方法的工作条件进行优化,对其灵敏度、线性范围、重复性和对登革热非结构蛋白NS1阳性患者血清IL-37的检测效果进行评价。结果：重组IL-37蛋白为标准品建立的双抗夹心ELISA法检测灵敏度为1.465 μg/L,线性范围为1.465~46.875 μg/L,批内和批间变异系数分别为6.6%和11.7%。采用此方法对诊断为登革热的患者血清进行检测,结果显示非结构蛋白NS1阳性患者IL-37水平显著高于健康人对照组。结论：成功建立了双抗夹心ELISA检测方法,可用于人血清中IL-37的检测。     

抗牛碱性成纤维细胞生长因子单克隆抗体的制备及初步鉴定

目的：制备抗牛碱性成纤维细胞生长因子(bFGF)单克隆抗体(mAh)，并鉴定其亚类，建立ELISA检测bFGF含量的方法。方法：应用基因重组的牛bFGF免疫BALB／c小鼠，通过细胞融合，建立分泌抗bFGF mAh的杂交瘤细胞株。应用免疫沉淀技术鉴定抗bFGF mAh的亚类；应用基因重组的牛bFGF免疫青紫蓝兔，制备抗bFGF的多抗血清；将抗bFGF mAb及兔抗血清用Protein A亲和层析纯化后，建立检测bFGF含量的ELISA方法。结果：共获得3株稳定分泌抗bFGF mAb的杂交瘤细胞株；它们所分泌的mAb均为IgG1；采用夹心ELISA法检测bFGF的敏感性达ng水平。结论：抗bFGF mAb(IgG1)和多克隆抗体制备为临床应用及相关研究提供了必要的试剂。     

An ELISA sandwich capture assay for recombinant fusion proteins containing glutathione-S-transferase.

A sandwich capture ELISA technique is presented for detection of recombinant proteins sharing a common affinity domain or reagents such as antibodies that bind to these proteins. An activated carrier protein (BSA) is modified with reduced glutathione (GT), forming an affinity capture reagent for glutathione-S-transferase (GST) and recombinant fusion proteins bearing the GST moiety. GT-BSA is immobilized on microtiter plates, and a sandwich is formed consisting of the recombinant fusion protein, reactive antibodies, and detection antibodies. An example is given that demonstrates that this format yields equivalent results to a conventional ELISA test with a panel of newly diagnosed diabetic sera reacting with an islet cell autoantigen.     

Enzyme-linked immunosorbent assay to monitor colorectal carcinoma patients treated with a monoclonal antibody (17-1A)

An enzyme-linked immunosorbent assay (ELISA) was compared to a radioimmunoassay (RIA) for the detection and quantification of mouse monoclonal antibody MoAb 17-1A and for measurement of the host response (i.e. anti-mouse immunoglobulin in sera from patients receiving immunotherapy with MoAb 17-1A. Comparable sensitivity and reproducibility were noted with RIA and ELISA but ELISA was more rapid to perform than RIA. Thus quantitative ELISA compared favorably with the RIA for MoAb detection.     

Use of enzyme-linked immunosorbent assays with chimeric fusion proteins to titrate antibodies against Epstein-Barr virus nuclear antigen 1.

Two new enzyme-linked immunosorbent assays (ELISAs) with chimeric fusion polypeptides for the detection of human antibodies specific to Epstein-Barr virus nuclear antigen 1 (EBNA-1) are described. One is an indirect ELISA with affinity-purified beta-galactosidase-EBNA-1 fusion protein as the antigen. The other is a "sandwich" assay based on the use of anti-beta-galactosidase antibody to capture beta-galactosidase-EBNA-1 fusion proteins in bacterial extracts. A good correlation was shown between antibody titers determined by the ELISA with the EBNA-1 fusion proteins and those determined by a conventional anticomplement immunofluorescence test which is being widely performed with Raji cells for the purpose of research and clinical diagnosis. The advantage of the ELISAs for seroepidemiologic studies on Epstein-Barr virus was demonstrated by sensitive detection of marginal immunoglobulin G antibody to the EBNA-1 domain in serum samples from patients with infectious mononucleosis.     

Nanog基因的原核表达及抗体制备

目的:在大肠杆菌中表达Nanog融合蛋白,制备兔抗小鼠Nanog融合蛋白抗体。方法:从含小鼠Nanog基因的pNA992质粒中扩增出小鼠Nanog基因并插入pET-32a中构建pET-32a-Nanog重组表达载体,并转化大肠杆菌BL21,经IPTG诱导表达,得到了Nanog融合蛋白,并经Histrap亲和层析柱纯化后,将其作为抗原免疫家兔制备多克隆抗体,用间接ELISA法检测抗体效价,Western blot和免疫细胞化学染色检测抗体特异性。结果:成功地构建了重组表达载体pET-32a-Nanog,经诱导获得了大量Nanog融合蛋白,其主要以包涵体形式表达,纯化后蛋白纯度达到97%,经免疫的兔抗血清效价可达1∶32 000,并表现出较好的特异性。结论:成功地制备出高滴度、高特异性的兔抗Nanog融合蛋白抗体。