抗二羰基/L-木酮糖还原酶单克隆抗体的制备与鉴定

目的制备抗人二羰基/L-木酮糖还原酶(Dicarbon-yl/L-xylulosereductase,DCXR)的单克隆抗体(mAb)并进行初步鉴定。方法将正常成人肝组织匀浆离心并分离线粒体,用线粒体总蛋白免疫BALB/c小鼠,采用杂交瘤技术制备mAb,并通过间接ELISA法、Westernblot及免疫组化的方法对mAb进行特性鉴定,通过免疫沉淀联合质谱、Uni-ZAPXR表达文库筛选鉴定抗原。结果获得1株可稳定分泌抗人DCXRmAb的杂交瘤细胞系。mAb的Ig亚类(型)为IgG1(κ),该mAb可用于ELISA检测、Westernblot、免疫组化和免疫沉淀实验。结论成功制备了抗人DCXR的mAb,为DCXR的研究提供了有力的工具。     

抗醛糖还原酶单克隆抗体的制备与特性鉴定

目的:制备抗醛糖还原酶(AR)的单克隆抗体(mAb),并与本室制备的抗醛糖还原酶相似蛋白(ARL-1)mAb进行比较。方法:经RT-PCR获得AR基因,将基因插入pGEX-4T-1(His)6C中,构建重组质粒pGEX-4T-1(His)6C-AR,以重组质粒转化E.coliRosetta诱导表达GST-AR蛋白。以纯化的GST-AR蛋白免疫BALB/c小鼠,采用杂交瘤技术制备mAb。应用间接ELISA和Western blot方法对mAb进行筛选和鉴定。使用Clustalx和Antheprot软件,比较AR与ARL-1的同源性,表达GST-dAR[80~142氨基酸(aa)],与ARL-1差异较大;并分析AR的抗原性,表达GST-dA1(1~79aa)、GST-dA2(80~99aa)、GST-dA3(111~142aa)、GST-dA4(143~316aa)。利用AR全长及截短蛋白,采用Western blot分析制备的抗AR mAb识别AR抗原的部位。结果:获得3株稳定分泌抗AR mAb的杂交瘤细胞系ARB3、AR7B3G4和ARF10。3株抗GST-AR的mAb均为IgG1(κ型),腹水mAb效价为1∶4×105,细胞培养上清mAb效价为1∶1×104,3株mAb均可与胎盘组织中的AR蛋白起反应,而与GST-ARL-1和GST蛋白无交叉反应。它们分别为抗GST-dA1、GST-dA3和GST-dA4蛋白的mAb。结论:成功地制备了3株特异性抗AR mAb,可分别识别AR的1~79、111~142、143~316位氨基酸。将它们与抗ARL-1mAb联合应用,将有助于进一步研究AR与ARL-1蛋白的功能,并为深入探讨AR、ARL-1与相关疾病的关系及进行大规模的流行病学调查提供了有力的工具。     

抗丙酮酸脱氢酶复合体E2亚基单克隆抗体的制备与鉴定

目的 制备抗人丙酮酸脱氢酶复合体E2亚基(pyruvate dehydrogenase complex E2,PDC-E2)的单克隆抗体(mAb)并进行初步鉴定.方法 将正常成人肝组织匀浆离心并分离线粒体,用线粒体总蛋白免疫Balb/c小鼠,采用杂交瘤技术制备mAb,并通过间接ELISA法、Western blot及免疫组化的方法对mAb进行特性鉴定,通过免疫沉淀联合质谱、Uni-ZAP XR肝脏cDNA表达文库筛选鉴定抗原.结果 获得1株可稳定分泌抗人PDC-E2 mAb 的杂交瘤细胞系.mAb的Ig亚类(型)为IgG1(κ), 该mAb可用于ELISA检测、Western blot、免疫组化和免疫沉淀实验.结论 成功制备了抗人PDC-E2的mAb,为PDC-E2的研究提供了有力的工具.     

抗谷胱甘肽还原酶单克隆抗体的研制及鉴定

谷胱甘肽还原酶（ＥＣ１．６．４．２，ＧＲ）为一种黄素酶，可催化氧化型谷胱甘肽转变成还原型谷胱甘肽（ＧＳＨ），从而提高细胞液中ＧＳＨ的含量。ＧＳＨ具有抵抗自由基氧化对机体损伤的作用。ＧＳＨ的储量与创伤、肿瘤等的预后，以及人体衰老有关〔１〕。本研究采用淋巴细胞杂交瘤技术，研制了抗酵母菌ＧＲ的单克隆抗体（ｍＡｂ），并对其生物学特性进行了分析，从而为ＧＲ的纯化及其用免疫化学法测定提供了重要的试剂。１材料和方法１．１材料酵母菌谷胱甘肽还原酶，为美国Ｓｉｇｍａ公司产品。Ｂａｌｂ／ｃ小鼠，８周～１２周龄，雌…     

异常凝血酶原单克隆抗体的制备与鉴定

凝血酶原是由肝脏合成的依赖维生素Ｋ的凝血因子。异常凝血酶原（ＡｂｎｏｒｍａｌＰｒｏｔｈｒｏｍｂｉｎ,ＡＰＴ）和凝血酶原的化学结构极其相似,区别在于：ＡＰＴ分子氨基端的特定位置上的谷氨酸残基未经羧基化,因而缺乏结合钙离子的结构基础,在一般凝血试验中无凝...     

PON2单克隆抗体的制备与初步鉴定

目的:制备PON2(paraxonase2)单克隆抗体(mAb),并进行初步鉴定.方法:利用生物信息学方法分析人类PON2蛋白序列,选取与小鼠同源性低,而免疫原性与亲水性均较强的片段,构建重组表达质粒pGEX-4T-1-PON2和PET-32a-PON2,GST-PON2和HIS-PON2融合蛋白在大肠杆菌中进行表达, 以HIS-PON2作为免疫原制备鼠mAb,以GST-PON2作为筛选抗原.采用Western blot、间接免疫荧光鉴定mAb的特异性.结果:GST-PON2和HIS-PON2融合蛋白均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PON2的杂交瘤细胞株,这2株抗体可以识别HepG2细胞中的靶蛋白.结论:成功制备出2株抗PON2的mAb,并通过免疫荧光技术检测了该蛋白在HepG2细胞中的分布,为进一步进行PON2蛋白的的研究提供了有效的工具.     

甲胺磷单克隆抗体制备及鉴定

目的：制备并鉴定甲胺磷农药单克隆抗体。方法：用500mg/mL PEG 4000作融合剂进行细胞融合，HAT（H，次黄嘌呤；A，氨基喋呤;T,鹃腺嘧啶）培养基选择性培养，自制的显微操作装置进行亚克隆。用间接ELISA（酶联免疫吸附测定）和间接竞争ELISA方法对2株细胞进行鉴定，并测定与其它农药的交叉反应率。结果：得到2株稳定分泌甲胺磷抗体的单克隆细胞株，命名为1C3和2C6；间接ELISA法表明2株细胞与载体牛血清蛋白质（Bovine serum albumin,BSA)和卵清蛋白质（Ovalbumin,OVA)反应成阴性；间接竞争ELISA法表明2株细胞上清液内的抗体可以竞争性地与甲胺磷结合；2株单克隆细胞均系IgG1亚类；1C3细胞诱导腹水纯化后的抗体与其它有机磷农药几乎没有交叉反应。结论：成功制备2株分泌抗甲胺磷抗体的单克隆细胞株，并可用于检测甲胺磷的研究。     

结肠癌单克隆抗体的制备和鉴定

用1高碘酸处理结肠癌组织,然后免疫小鼠制备单克隆抗体.获得2株产生高效价、针对结肠癌抗原的抗体杂交瘤细胞株C_8和C_(102)。经免疫组织化学染色后知其抗原定位于结肠癌腺体的上皮细胞及其分秘物.由Immunoblotting知其抗原的分子量为20万道尔顿.初步研究表明,C_8和C_(102)是特异性较强的针对结肠癌的单克隆抗体(IgG2b).经高碘酸(或胰酶)处理证明,其相应抗原决定基部分是蛋白质而不是多糖.     

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。     

抗凝血酶受体单克隆抗体的制备与鉴定

采用杂交瘤技术，获得了４株稳定分泌抗凝血酶受体单克隆抗体（ＭｃＡｂ）杂交瘤细胞株。４株ＭｃＡｂ均为ＩｇＧ１κ链。ＥＬＩＳＡ交叉试验结果表明，该ＭｃＡｂ不与人凝血酶、凝血酶原和ＨＣＶ多肽反应。４株杂交瘤细胞培养上清液效价为３．２×１０－２～１．２８×１０－３，腹水效价为１．６×１０－６～５．１２×１０－７。     

抗11β-羟类固醇脱氢酶1的单克隆抗体的制备与鉴定

目的:制备抗人11β-羟类固醇脱氢酶1(homo sapiens hydroxysteroid 11-beta dehydrogenase 1,HSD11B1)的单克隆抗体(mAb)并初步鉴定其特性.方法:将正常成人肝组织匀浆离心并分离线粒体,用线粒体总蛋白免疫BALB/c小鼠,采用杂交瘤技术制备mAb,并通过间接ELISA法、Western blot、免疫组化的方法对mAb进行特性鉴定,通过免疫沉淀、Uni-ZAP XR肝脏cDNA表达文库筛选鉴定抗原.结果:通过间接ELISA筛选获得1株可稳定分泌抗人HSD11B1 mAb的杂交瘤细胞系.其分泌的mAb的Ig亚类(型)为IgG1(κ),Western blot结果显示该mAb可以特异地识别相对分子质量(Mr)为35 000的蛋白;应用mAb CBF245对人肝脏cDNA表达文库(Uni-ZAP XR)进行筛选,阳性噬菌斑测序结果显示5个阳性克隆插入序列均为HSD11B1.结论:mAb BAD062特异地识别抗原HSD11B1,该mAb可用于ELISA检测、Western blot、免疫组化和免疫沉淀实验,为HSD11B1的研究提供了有力的工具.     

小鼠抗人磷脂酰肌醇3激酶相互作用蛋白1单克隆抗体的制备和鉴定

目的:制备鼠抗人磷脂酰肌醇3激酶相互作用蛋白1(PIK3IP1)的单克隆抗体(mAb),探讨PIK3IP1蛋白的结构和功能.方法:利用重组蛋白GST-PIK3IP162-168为免疫原,免疫BALB/c小鼠,取免疫小鼠的脾细胞和同系小鼠的骨髓瘤细胞Sp2/0进行常规融合,通过间接ELISA的筛选和有限稀释克隆化,获得鼠抗人PIK3IP1蛋白mAb的杂交瘤细胞株,通过ELBA,Western blot和免疫荧光技术等方法对其特性进行鉴定.结果:成功地建立了1株稳定分泌抗PIK3IP1蛋白的mAb杂交瘤细胞株,命名为5C6,其免疫球蛋白亚类为IgG1.ELISA检测的腹水效价可达1:107.5C5 mAb与重组GST-PIK3IP162-168蛋白有较强的特异性反应,而与大肠杆菌裂解液以及谷胱苷肽2S转移酶(GST)没有交叉反应.同时,5C6 mAb也能特异性地结合真核细胞超表达的全长PIK3IP1蛋白和变异体PIK3IP1-v1,但检测不到内源性的PIK3IP1蛋白.共聚焦免疫荧光显微镜结果显示PIK3IP1和PIK3IP1-v1定位于胞质,在胞质中呈现不均一的斑点状分布.结论:获得了效价高、特异性好的PIK3IP1蛋白的mAb,为进一步研究PIK3IP1的生物学功能提供了有用的工具.     

Generation and characterization of a neutralizing monoclonal antibody against erythroid cell stimulating factor

Erythroid cell stimulating factor (ESF) is present in mouse serum and has been reported to function in concert with erythropoietin (EPO) in the formation of erythroid cells in in vitro culture systems. We report here the generation and characterization of a monoclonal antibody (MAb) directed against ESF, with potent anti-ESF-neutralizing activity. A hybridoma-producing MAb to ESF was selected following enzyme-linked immunosorbent assay (ELISA)-based screening of 270 colonies obtained from a fusion of immunized mouse splenocytes with NS1 myeloma cells. Western blot analyses of mouse serum using this antibody specifically detected a single protein (approximate molecular weight of 60 kDa and 120 kDa, under reducing and nonreducing conditions, respectively) corresponding to ESF, with no reactivity to EPO. Furthermore, this MAb demonstrated reactivity to a protein similar in molecular mass, across species, showing reactivity in sera obtained from human, horse, goat, guinea pig, rabbit, and rat. Immuno-chemical characterization demonstrated this antibody to be of IgG3 isotype, bearing kappa light chains. Injection of this monoclonal anti-ESF antibody to exhypoxic polycythemic mice at 6 and 24 h after EPO injection significantly reduced 59Fe incorporation into red blood cells, demonstrating its ability to neutralize in vivo erythropoiesis in our mouse model system. Thus, this novel erythroid cell-specific MAb will be an invaluable tool for further delineating the physiological role of ESF in in vivo erythropoiesis.     

Ethnic differences in GRHPR mutations in patients with primary hyperoxaluria type 2

The objective of this study was to investigate ethnic differences in the glyoxylate reductase/hydroxypyruvate reductase (GRHPR) gene in patients with primary hyperoxaluria type 2 (PH2). GRHPR was genotyped in Japanese patients with PH2 and all GRHPR mutations described to date were reviewed in terms of geographic and ethnic association. We identified a novel mutation, a two‐nucleotide deletion (c.248_249delTG) in exon 3 creating a premature ‘stop’ at codon 91. Also, we found that the c.864_865delTG mutation was associated with the rs35891798 single‐nucleotide polymorphism. The allelic frequencies of the c.103delG, c.494G>A, c.403_404+2 delAAGT, and c.864_865delTG mutations in PH2 patients were 37.8%, 15.6%, 10.0%, and 10.0%, respectively. All patients with the c.103delG mutation were Caucasian. Patients with the c.494G>A mutation and 78% (7/9) of those with the c.403_404+2 delAAGT mutation were from the Indian subcontinent, whereas those with the c.864_865delTG mutation were Chinese or Japanese. Molecular analysis of GRHPR of four Japanese PH2 patients identified a novel mutation (c.248_249delTG in exon 3). Caucasians with PH2 should be screened for the c.103delG mutation; patients from the Indian subcontinent for c.494G>A; and patients of East Asian origin (particularly) for c.864_865delTG. The prevalence of the latter mutation in PH2 patients from East Asia was 75.0%.     

人绒毛膜促性腺激素单克隆抗体的研制

目的获得针对人绒毛膜促性腺激素单克隆抗体。方法hCG蛋白免疫Balb／c小鼠,取其脾细胞与同系小鼠骨髓瘤细胞NS-1按8：1比例融合,间接ELISA法筛选阳性克隆,有限稀释法进行克隆化培养;制备腹水抗体;采用间接ELISA法鉴定抗体亚型和测定抗体效价。结果得到6株能稳定分泌单克隆抗体的杂交瘤细胞株;抗体经鉴定均为IgG1、κ型,效价均达10^-5以上。结论所获得的6株杂交瘤细胞株均有较强稳定分泌抗-hCG单克隆抗体的能力。这为有关hCG的检测、hCG本身相关研究以及避孕疫苗的研制打下了基础。     

Generation and characterization of a neutralizing rat anti-rmTNF-alpha monoclonal antibody

A rat anti-recombinant mouse tumour necrosis factor-alpha (rmTNF-alpha) monoclonal IgM antibody (1F3F3) with high specific binding activity for rmTNF-alpha was generated. The 1F3F3 monoclonal antibody (mAb) neutralizes the cytotoxic activity in vitro of rmTNF-alpha on L929 cells and inhibits the binding of radiolabelled rmTNF-alpha to its putative receptor on L929 cells. The 1F3F3 mAb binds to monomeric, dimeric and trimeric rmTNF-alpha and does not bind to reduced rmTNF-alpha, indicating that the recognized epitope is sensitive to denaturation. Using the 1F3F3 mAb as a capturing antibody and a biotinylated anti-rTNF-alpha as a detecting antibody, we have developed a sandwich ELISA that can specifically detect biologically active mTNF-alpha with a detection limit of 10 pg mTNF-alpha/well. This assay correlates well with the classical L929 cristal violet assay for the detection of bioactive rmTNF-alpha in biological fluids. The 1F3F3 mAb inhibits various in vitro biological activities of the rmTNF-alpha, such as the TNF-alpha-mediated tumoricidal activity of activated macrophages, the rmTNF-alpha-dependent stimulation of neutrophil degranulation and the growth-promoting effect of rmTNF-alpha. In vivo the 1F3F3 mAb inhibits lipopolysaccharide (LPS)-induced endotoxic shock. In conclusion, the 1F3F3 mAb is a useful tool to probe rmTNF-alpha activity both in vitro and in vivo.     

抗嗜水气单胞菌单克隆抗体的制备及初步鉴定

嗜水气单胞菌是养殖及野生鱼、虾、蛙、甲鱼等生物常见的细菌性病原体[1],可通过受伤的皮肤及伤口感染,并可通过食物链感染人,造成腹泻、败血症等疾病而严重威胁人类健康,是我国沿海地区人群中最常见的致病性弧菌之一[2].     

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。     

Production and characterization of a monoclonal antibody against neopterin

We have produced and characterized the first monoclonal antibody against neopterin (D-erythro-6-(1,2,3,-trihydroxypropyl)pterin). The antibody specifically recognizes neopterin in a modified RIA. The binding capacity in this assay is 34%, the sensitivity limit of inhibition is 0.9 nmol/l. Cross-reactivity exists with monapterin (L-threo(1,2,3,trihydroxypropyl)pterin) in 30%, with other pteridines cross-reactivity has been found in less than 5%.