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。     

抗人DcR3单克隆抗体的研制及其鉴定

目的:制备抗人DcR3单克隆抗体(mAb),并鉴定其特异性.方法:纯化的His-DcR3融合蛋白免疫小鼠,应用淋巴细胞杂交瘤技术制备抗人DcR3 mAb并进行纯化,纯化后的抗体经Western blot和ELISA方法鉴定其特异性、Ig亚型和效价.结果:获得5株稳定分泌抗DcR3 mAb的杂交瘤细胞,均属IgG1亚型,其腹水抗体效价为1×10-5 ～1×10-7,Western blot显示5株细胞分泌的mAb均可识别DcR3蛋白,其中1株(1B1)可与SW480细胞成分反应.结论:成功建立稳定分泌抗人DcR3 mAb的杂交瘤细胞株,其分泌的抗体特异性强、效价高,为研究DcR3在组织中的表达、分布及研制ELISA试剂盒奠定基础.     

抗鸡蛋卵类黏蛋白单克隆抗体的制备与鉴定

目的制备和鉴定鼠抗鸡蛋主要过敏原卵类黏蛋白的单克隆抗体。方法利用鸡蛋卵类黏蛋白(ovm)为免疫原,免疫Balb/c小鼠,取免疫小鼠脾细胞与小鼠骨髓瘤NS-1细胞融合。采用半固体培养基法和有限稀释法相结合的方法快速筛选获得稳定分泌的特异性杂交瘤细胞。用杂交瘤细胞株诱生小鼠腹水,应用蛋白A亲和层析法进行抗体纯化。采用Ig类与亚类鉴定试剂盒鉴定该单克隆抗体的Ig亚型;通过间接ELISA、Western blotting鉴定该单克隆抗体的特性和交叉性。利用双抗体夹心ELISA法检测食品中的鸡蛋过敏原。结果获得4株可稳定分泌鼠抗卵类黏蛋白的单克隆抗体,分别命名为1G8,2H5,3A7,4G4,其Ig亚型均为IgG1。且4株单抗效价均在10-8以上。ELISA和Western blotting分析表明该4株单抗均能特异性识别卵类黏蛋白,并且建立双抗体夹心ELISA的方法可以准确的检测出食品中鸡蛋过敏原的存在。结论成功制备了4株高效价的鼠抗卵类黏蛋白的单克隆抗体,为建立卵类黏蛋白检测及纯化方法奠定了基础,也可为食品中鸡蛋过敏原的检出提供依据。     

抗粉尘螨主要变应原Der f1单克隆抗体的制备与鉴定

目的制备和鉴定鼠抗粉尘螨主要变应原Derf1的单克隆抗体（monoclonal antibody,McAb）。方法利用重组Derf1蛋白为免疫原,免疫BALB／c小鼠,取免疫小鼠脾细胞与小鼠骨髓瘤NS-1细胞融合。通过间接ELISA法筛选特异性分泌的杂交瘤细胞。用杂交瘤细胞株诱生小鼠腹水,应用蛋白A亲和层析法进行抗体纯化。采用Ig类与亚类鉴定试剂盒鉴定该单克隆抗体的Ig亚型;通过间接ELISA、Western Blotting鉴定该单克隆抗体的特性和交叉性。结果获得6株可稳定分泌鼠抗粉尘螨主要变应原Derf1的单克隆抗体,其Ig亚型均为IgG1,且6株单抗均具有良好的效价。ELISA和Western—blotting分析表明,该6株单抗均能识别重组Derf1蛋白和天然的粉尘螨提取物。其中,除了484不识别屋尘螨提取物,其他均能识别。结论成功制备了6株鼠抗粉尘螨主要变应原Derf1的单克隆抗体,为建立粉尘螨主要变应原Derf1检测及纯化方法奠定了基础。     

抗HPT单克隆抗体的制备与生物学特性鉴定

目的：制备抗潮霉素B磷酸转移酶(HPT)的单克隆抗体(McAb)，建立一种快速检测转基因作物中该选择标记基因HPT编码蛋白的方法。方法：用基因重组潮霉素B磷酸转移酶(HPT)抗原免疫BALB/C小鼠，采用杂交瘤技术制备McAb。选择不同的抗原决定簇与兔抗HPT多抗配对，建立双抗夹心ELISA检测HPT抗原。结果：筛选出四株稳定分泌抗HPT单抗的杂交瘤细胞株，IgG亚类鉴定均为IgG1，ELISA检测证实单抗可特异性识别细胞培养上清、重组子菌体裂解产物中及纯化出的HPT蛋白。结合位点测定实验表明4株单抗是针对不同的抗原决定簇，与多克隆抗体组成双抗夹心ELISA法，均可较好地检测到HPT抗原。检测的灵敏度为30ng／ml，且与别的无关抗原无交叉反应性。结论：4株杂交瘤细胞株特异性好，亲和力强，组成双抗夹心ELISA法可用于快速、灵敏检测HPT抗原。     

阪崎肠杆菌单克隆抗体的制备与特性鉴定

目的:制备抗阪崎肠杆菌的单克隆抗体并对其生物学特性进行鉴定。方法:采用灭活的阪崎肠杆菌菌体为抗原,免疫BALB/c小鼠,取血清效价高的小鼠脾细胞与SP2/0骨髓瘤细胞进行融合,间接ELISA法筛选阳性杂交瘤细胞,mAb亚类检测试剂盒鉴定单克隆抗体的亚型,通过Western blot和间接ELISA法鉴定该单克隆抗体的特性、效价及mAb相对亲和力。结果:获得2株能稳定分泌抗阪崎肠杆菌mAb的杂交瘤细胞株,分别命名为1H7、2B12,抗体Ig亚类分别为IgG1和IgG2b;交叉反应显示单抗具有良好的特异性;ELISA分析表明制备的单抗效价在1×107～2×107,相对亲和常数达109L/mol,染色体鉴定分别为104和106条,符合杂交瘤细胞的特性。结论:抗阪崎肠杆菌单克隆抗体的成功制备为其快速检测方法的建立奠定了基础。     

平榛主要过敏原Corh1单克隆抗体的制备与鉴定

目的制备和鉴定鼠抗平榛主要变应原Cor h 1的单克隆抗体(Monoclonal Antibody,McAb)。方法用重组Cor h 1蛋白为免疫原,免疫Balb/c小鼠,取免疫小鼠脾细胞与小鼠骨髓瘤NS-1细胞融合。通过间接ELISA法筛选分泌特异性McAb的杂交瘤细胞。用杂交瘤细胞株诱导小鼠产生腹水,再用蛋白A亲和层析法纯化抗体。采用Ig类与亚类鉴定试剂盒鉴定该单克隆抗体的Ig亚型;通过间接ELISA、Western Blotting鉴定该McAbs的特性和交叉性。结果获得4株可稳定分泌鼠抗平榛主要变应原Cor h 1的McAbs,其Ig亚型均为IgG1,均具有良好的效价;ELISA和Western Blotting分析表明该4株单抗均能识别重组Cor h 1蛋白,其中3株单抗能够识别天然平榛提取物。结论成功制备了4株鼠抗平榛主要变应原Cor h 1的单克隆抗体,为建立平榛主要变应原Cor h 1检测及纯化方法奠定了基础。     

抗3-硝基酪氨酸单克隆抗体的制备及免疫学特性分析

目的制备抗3-硝基酪氨酸(3-NT)单克隆抗体并鉴定其免疫学特性。方法用化学合成方法将3-NT与OVA用戊二醛偶联合成的人工抗原3硝基酪氨酸-戊二醛-鸡卵白蛋白(3NT-G-OVA)作为免疫原,皮下注射免疫Balb/c小鼠,取免疫小鼠脾细胞与SP2/0骨髓瘤细胞进行细胞融合,用间接ELISA法筛选阳性杂交瘤细胞株,扩大培养并对抗体进行免疫学鉴定与分析。结果获得1株稳定分泌抗3-硝基酪氨酸单克隆抗体的杂交瘤细胞株,所分泌的单抗亚型为Ig G2a;纯化后的抗体效价为1∶(6.14×106);单抗亲和力常数为7.81×107(L·mol-1);Western blot检测证明该单抗与含有3-硝基酪氨酸的蛋白能特异地结合。结论制备了1株具有较高免疫学活性和特异性的抗3-NT单克隆抗体,并可用于Western blot检测病人样本中的蛋白硝基化水平。     

幽门螺杆菌尿素酶B单克隆抗体的制备、鉴定及应用

目的：制备幽门螺杆菌（Hp）尿素酶B（ureB）单克隆抗体并鉴定。 方法： 以Hp重组纯化蛋白ureB为抗原，运用杂交瘤技术制备ureB单克隆抗体，用间接ELISA法检测抗体免疫学活性，用双抗夹心的IRMA法检测不同单抗是否识别相同的表位，并用于检测Hp感染。 结果： 获得两株识别不同表位的ureB单抗杂交瘤细胞，可测得Hp 感染的相关抗原。 结论： 抗ureB单抗可特异性与Hp结合，可用于建立幽门螺杆菌现症感染的检测方法。     

pICln蛋白单克隆抗体的制备及初步鉴定

目的:制备特异性的抗plCln蛋白的单克隆抗体(McAb),为plCln的纯化及检测等提供必要的工具.方法:以pICln的合成肽为免疫原,对BALB/c小鼠注射免疫,将免疫鼠脾细胞和小鼠骨髓瘤细胞NS-1进行细胞融合,用显微镜下挑选单个克隆的克隆化方法克隆化,用间接ELISA检测法进行筛选.单抗的效价、亚型及特异性用ELISA、免疫双向扩散实验和Western blot等检测.结果:获得了稳定的分泌型杂交瘤细胞株大2B7和4A3,2B7培养上清液单抗效价为1:64,属IgGl亚型,其腹水抗体效价及纯化抗体的效价分别为1:1.28×104、1:6.4×103,Westem blot及免疫耗竭实验呈现一条约40 kD)的特异性带,免疫组织化学染色显示在细胞核和细胞质中呈现阳性反应.结论:本次制备的单抗具有特异性、高效价,可应用于plCln蛋白的纯化及检测等研究.     

A simple enzyme-linked immunosorbent assay (ELISA) for the neuron-specific gamma isozyme of human enolase (NSE) using monoclonal antibodies raised against synthetic peptides corresponding to isozyme sequence differences.

Monoclonal antibodies specific for the gamma isozyme of human enolase (known as neuron-specific enolase or NSE) have been raised against synthetic peptides after coupling to carrier protein: the selected peptides were those corresponding to regions of amino acid sequence difference between the alpha and gamma subunits of these closely similar isozymes. This technique gave monoclonal antibodies of high specificity and affinity. Two monoclonal antibodies raised against different peptides were used to develop a double-antibody sandwich enzyme-linked immunosorbent assay (ELISA), using one as the solid-phase antibody and the other conjugated to horseradish peroxidase to detect the bound NSE. This assay provides a simple and routine method of detecting NSE in serum samples from patients with small-cell carcinoma of the lung and related tumours.     

Enzyme-linked immunosorbent assay for IgG and IgM antibodies against human parvovirus B19: use of monoclonal antibodies and viral antigen propagated in vitro

Enzyme-linked immunosorbent assay (ELISA) systems for serum IgG and IgM antibodies to human parvovirus B19 were established by utilizing anti-B19 monoclonal antibodies (mAbs) and human plasma B19 antigen. The specificities of IgG and IgM ELISA were confirmed by indirect immunofluorescence staining and Western blot immunoassay with panel sera. The series of serum specimens obtained from two B19-infected patients were examined with ELISA. The IgM antibody titers increased quickly after the onset of the symptoms and returned to a negative range after five months. The IgG antibody titers also increased just after the increasing of IgM titers and the elevated levels continued for more than a year. We also established the same ELISA systems by utilizing in vitro propagated B19 antigen and similar results were obtained.     

抗人LSECtin单克隆抗体的制备与初步鉴定

目的:制备抗肝脏、淋巴结窦内皮细胞C型凝集素(LSECtin)单克隆抗体(mAb),并进行特性鉴定。方法:采用原核表达的LSECtin免疫BALB/c小鼠,以间接ELISA法筛选分泌特异性mAb的杂交瘤细胞,采用蛋白印迹、间接免疫荧光、流式细胞术和免疫组化染色法鉴定mAb的特异性。结果:共获得8株可稳定分泌mAb的杂交瘤细胞株。mAb的Ig亚类均为IgG,效价达1∶106~1∶107。这些mAb均可识别转染3T3细胞膜上的人LSECtin,6株mAb可特异识别肝脏窦内皮细胞。结论:成功地制备8株抗LSECtin的mAb,经免疫印迹、流式细胞术和免疫组化染色检测,这些mAb的特异性良好,为研究LSECtin的功能提供了有力的试剂。     

抗人GCRG213单克隆抗体的制备与鉴定

目的:制备GCRG213单克隆抗体(mAb)并进行初步鉴定。方法:在大肠杆菌中表达HIS-GCRG213融合蛋白,并以所获蛋白作为免疫原制备鼠mAb。采用ELISA、Westernblot法鉴定抗体的效价及特异性。免疫组化染色观察GCRG213在胃癌和正常组织中的表达。结果:HIS-GCRG213融合蛋白在大肠杆菌中获得高效表达,经常规的细胞融合和筛选获得2株可稳定分泌抗GCRG213的杂交瘤细胞株。ELISA法检测腹水的效价可达到1∶106,Western blot证实该抗体可与重组HIS-GCRG213蛋白特异性结合。免疫组化染色显示GCRG213在胃癌组织中的表达明显强于正常胃黏膜组织。结论:成功地制备出2株抗GCRG213的mAb,为进一步研究GCRG213的生物学功能提供了有效的工具。     

重组人源细胞珠蛋白单抗制备及检测方法建立

目的制备重组人源细胞珠蛋白（recombinanthumanCytoglobin,rhCygb）单克隆抗体,并建立检测该蛋白双抗体夹心ELISA法,为下一步研究rhCygb药代动力学做准备。方法用纯化的rhCygb免疫BALB/c小鼠,采用甲基纤维素半固体培养基法获得抗rhCygb的单克隆抗体杂交瘤细胞,间接ELISA法筛选制备单克隆抗体,建立双抗体夹心ELISA法。结果筛选获取了稳定分泌单克隆抗体的杂交瘤细胞株,通过抗原表位相加法实验获得5株表位不同的细胞株,Western-blotting验证能与rhCygb特异性结合,间接ELISA法验证其不与本实验室制备的其它PET28a-BL21蛋白及BL21裂解液发生交叉反应。本方法灵敏度为1.25ng/ml,在浓度为10～1250ng/ml时,线性关系良好,相关性达0.9931,实验内和实验间平均变异系数分别为6.2%和10.92%。结论成功建立了灵敏度好、特异性高的双抗体夹心法,为下一步研究rhCygb药代动力学奠定了基础。     

Pneumocystis carinii antigen detection in rat serum and lung lavage.

We developed a modified double-antibody sandwich enzyme-linked immunosorbent assay (ELISA) that detected relatively low concentrations of known Pneumocystis carinii antigen added to buffer or rat sera. Artificial immunization-derived polyclonal rabbit anti-P. carinii antibody was used on the solid phase to capture the antigen. Infection-derived (after P. carinii pneumonia) polyclonal rat anti-P. carinii antibody or a mixture of five murine monoclonal antibodies was used as the antigen detector antibody. Rabbit anti-rat immunoglobulin G antibody or goat anti-mouse immunoglobulin G antibody conjugated to alkaline phosphatase was used as the final antibody. After standardization and optimization of the various reactants in this ELISA system, approximately 53 ng of known P. carinii antigen per ml suspended in phosphate-buffered saline-Tween 20 buffer or 210 ng of antigen per ml suspended in normal rat serum diluted 1:4 could be detected. In addition, an indirect ELISA for P. carinii antibody measurement was developed, using as the antigen a soluble supernatant from a sonicated preparation of Percoll-purified whole cysts and trophozoites to coat the solid phase. Limited studies with sera from a small number of caesarian-obtained, barrier-sustained rats from Charles River Breeding Laboratories, Inc., and the National Institutes of Health and sera from normal and heavily infected rats indicated that the caesarian-obtained, barrier-sustained rats had negligible levels of antibody. The normal and heavily infected rats had variable antibody titers. A significantly high level of P. carinii antigenemia was detected in only 2 (11%) of 18 heavily infected rats. Extensive studies of the P. carinii pneumonia rat model with the ELISA did not reveal significant serum P. carinii antigenemia during the acute stage of infection. However, soluble P. carinii antigen was detected by the ELISA and Western blot assays in the supernatant of lavage fluid after centrifugation to sediment intact organisms. As expected, P. carinii antigens were detected by these assays in the lavage pellet recovered after centrifugation. In conclusion, the antigen assay used in this study detected P. carinii antigen in lung lavage but failed to detect P. carinii antigen in rat serum during the acute phase of infection.     

A novel quantitative immunoassay system for p53 using antibodies selected for optimum designation of p53 status.

AIM: To develop a highly sensitive and specific enzyme linked immunosorbent assay (ELISA) system for analysis of p53 protein in cancer lysates. METHODS: The anti-p53 monoclonal antibodies DO7, 1801, BP53.12, and 421, and anti-p53 polyclonal antiserum CM1 were assessed by immunohistochemistry and western blot analysis to identify those most suitable for determining p53 status of cancer cells. Antibodies with desired characteristics were used to develop a non-competitive sandwich type ELISA system for analysis of p53 expression in cancer cytosols. Using the ELISA, p53 protein concentrations were measured in a small series of breast cancers, and the quantitative values compared with p53 immunohistochemical data of the same cancers. RESULTS: DO7 and 1801 gave the most specific and reliable results on immunohistochemistry and western blot analysis. Using these two antibodies, a non-competitive sandwich type ELISA system was developed to analyse p53 quantitatively. Analysis of the breast cancer series showed a good correlation between immunohistochemistry and the ELISA-tumours were generally positive using both techniques. Discrepancies were noted however: some cancers were immunohistochemically negative but ELISA positive. One explanation for this may be that the ELISA is more sensitive than immunohistochemistry. CONCLUSION: The p53 ELISA system is a non-competitive double monoclonal antibody sandwich method, using DO7 and 1801 which have been shown to be highly specific for p53 protein by immunohistochemistry and western blot analysis. The lower threshold of the assay is 0.1 ng/ml analyte in an enriched recombinant p53 preparation. As p53 is now regarded as a protein associated with prognosis in breast and other cancers, the assay may have clinical applications.     

人白细胞介素15单克隆抗体的制备及鉴定

目的 :用rhIL 15与沙门氏菌裸菌相偶联制备IL 15单克隆抗体 (monoclonalantibody ,McAb) ,以便为疾病的诊断、治疗和发病机制的研究提供可靠的生物制剂。方法 :将纯化的rhIL 15蛋白与沙门氏菌裸菌相偶联制成免疫原 ,用脾内、腹腔、静脉三种途径相结合免疫BALB c小鼠 ,以PEG为促融剂 ,将脾细胞与SP2 0细胞进行融合 ,HAT选择培养 ,间接ELISA筛选阳性克隆 ,通过多次克隆化 ,获得稳定分泌特异性McAb的杂交瘤细胞株 ,并对所获得的细胞株及分泌的McAb特性进行了分析。结果 :获得 4株能稳定分泌特异性McAb的杂交瘤细胞系 (hybridomacell,Hc) ,ELISA法检测其效价分别为 1:10 6 、1:10 7、1:10 7、1:10 7。Dotblot检测IL 15的灵敏度为 1 5ng ,其中一株 (1 7E4 )尚可用于Westernblot检测。结论 :成功制备了 4株IL 15McAb杂交瘤细胞系。