抗麻痹性贝毒素GTX2,3单克隆抗体的制备及特性分析

制备抗麻痹性贝毒GTX2,3单克隆抗体。利用醛化法将GTX2,3与载体牛血清白蛋白(BSA)偶联,制备完全抗原。免疫小鼠,取小鼠脾细胞与Sp2/0细胞融合。GTX2,3与钥孔血蓝蛋白(KLH)偶联作为检测抗原,用间接ELISA法筛选阳性克隆株。将筛选的阳性细胞株制备腹水。获得三株稳定分泌抗GTX2,3单克隆抗体的杂交瘤细胞株F4、F10、G9。间接ELISA法检测F10细胞株腹水抗体效价为1.4×10^-5。半抗原GTX2,3与载体蛋白偶联后,作为免疫原,可制备高滴度的抗GTX2,3抗血清和单克隆抗体。该抗体对于藻毒素具有高特异性和高亲和力,可用于污染海产品的麻痹性贝毒的检测。     

金霉素单克隆抗体的制备及检测方法的建立

采用羰基二咪唑法,将半抗原金霉素(AM)分别与牛血清白蛋白(BSA)和卵清蛋白(OVA)偶联制备金霉素免疫抗原AM-BSA和检测抗原AM-OVA,通过紫外光谱扫描检测偶联产物。采用细胞杂交瘤技术,制备抗金霉素单克隆抗体杂交瘤细胞株,建立了金霉素竞争ELISA检测方法,其灵敏度达到50ng/ml,且呈现良好的线性关系(r=0.9812),并且与其他抗生素无交叉反应。     

人生长分化因子15单克隆抗体制备、鉴定及药用价值初探

目的:制备稳定分泌抗人生长分化因子15(GDF15)单克隆抗体(m Ab)的杂交瘤细胞系,并对其分泌的m Ab进行鉴定。方法:根据人GDF15氨基酸序列特征,设计合成了8条能够免疫产生GDF15特异性抗体的抗原多肽,与VLP载体偶联后,免疫雌性BALB/c小鼠,利用杂交瘤技术制备鼠源抗人GDF15的m Ab,用间接ELISA检测m Ab腹水效价。结果:获得针对7个抗原多肽的12株稳定分泌抗人GDF15的杂交瘤细胞系,腹水m Ab效价可达1×104~1×109。结论:获得了针对不同抗原多肽的抗人GDF15的特异性m Ab,为进一步研发以GDF15为靶点的单克隆抗体抗肿瘤药物奠定了基础。     

氯霉素全抗原的合成及鉴定

为建立氯霉素的免疫分析方法,采用混合酸酐法和重氮化法,将半抗原氨霉素(CAP)与载体牛血清白蛋白(BSA)及卵清蛋白(OVA)偶联制备免疫抗原CAP-BSA和包被抗原CAP-OVA.以紫外扫描确定偶联率,并用酶联免疫(ELISA)的方法鉴定,确定偶联成功.经过比较,混合酸酐法优于重氮化法.     

纳米磁珠偶联CFP-10特异性单抗富集结核分枝杆菌方法的建立

目的:初步建立基于纳米磁珠偶联培养滤液蛋白10(CFP-10)特异性单抗富集结核分枝杆菌的方法。方法:大肠杆菌表达CFP-10抗原,采用鼠杂交瘤技术制备相应的CFP-10单抗,用NHS修饰的纳米磁珠偶联单抗,用以捕获结核分枝杆菌并进行抗酸染色检测。结果:制备的CFP-10单抗效价为1∶640000;免疫荧光检测显示CFP-10抗体偶联到磁珠上,抗酸染色验证了磁珠偶联的单抗能有效地捕获富集结核分枝杆菌。结论:建立了纳米磁珠偶联CFP-10特异性单抗有效捕获富集结核分枝杆菌的方法,为提高抗酸染色方法的阳性检出率奠定了基础。     

苄非他明人工抗原合成

目的: 通过化学方法对苄非他明进行结构修饰并保留抗原决定簇,将结构改造后的产物与载体偶联合成苄非他明抗原。方法: 苄非他明经化学修饰后,增加活性基团连接上一类可用的经化学修饰的连接臂,使用碳二亚胺法与载体蛋白偶联成苄非他明人工合成抗原。该抗原通过紫外吸收光光谱扫描技术、SDS-PAGE电泳法及胶体金免疫层析法进行偶联效果和抗原活性的鉴定。结果: 苄非他明半抗原结构与载体偶联成功,该抗原具有较高的纯度和活性,与苄非他明抗体反应表现出较高的特异性。结论: 该方法合成的苄非他明抗原可用于免疫检测方法,也可作免疫原制备相关抗体。     

用合成多肽免疫制备人α-半乳糖苷酶A单克隆抗体

目的:获得效价高的、特异性强的抗人α-半乳糖苷酶A(α-GalA)单克隆抗体,用于法布莱氏病的诊断。方法:分析并合成人α-GalA的优势抗原表位,合成多肽,将其与载体匙孔虫戚血蓝蛋白偶联,免疫小鼠,采用甲基纤维素半固体培养基筛选杂交瘤细胞株;用酶联免疫、SDS-PAGE、Western印迹和染色体核型分析等方法对杂交瘤细胞及其产生的单抗进行鉴定。结果与结论:筛选到1株杂交瘤细胞株,获得了高效价、特异性强、亲和力高的抗人α-GalA的单克隆抗体,抗体的亚型为IgG1亚型。     

博尔纳病病毒抗原免疫的杂交瘤细胞系的评价

目的评价博尔纳病病毒(BDV)抗原免疫的杂交瘤细胞系的产生抗体能力与抗体特异性。方法随机抽取2株由BDV抗原免疫的杂交瘤细胞系H1和H2,通过体内和体外方法制备单克隆抗体,通过间接免疫荧光、免疫印迹和间接酶联免疫吸附3种试验方法对制备的抗体进行特异性鉴定及效价测定。结果杂交瘤细胞系H1和H2可以产生一定效价的单克隆抗体,并对BDV的P24和P40抗原具有特异性。结论由杂交瘤细胞系H1和H2产生的单克隆抗体可以用于检测BDV特异性抗原。     

杂交瘤细胞磁性颗粒筛选方法的建立及探讨

本文报道一种新的杂交瘤细胞分离法——磁性颗粒筛选法,探讨了磁性颗粒的蛋白偶联量,磁性颗粒与细胞的作用比例、体积和时间对细胞分离效果的影响。对磁性颗粒对杂交瘤细胞的影响所作的初步研究表明,游离抗原或抗原包被的磁性颗粒对细胞的生长与成活有抑制作用,但磁性颗粒筛选到的杂交瘤细胞具有显著高于普通杂交瘤细胞的抗体分泌能力。     

光照强度对广西莪术挥发油及莪术醇含量的影响

采用水蒸气蒸馏法(XD)提取广西莪术挥发油,气相色谱法测定莪术醇的含量,并用SPSS10.0统计分析软件对数据进行分析,以探讨光照强度对主要有效成分挥发油和莪术醇生物合成途径的影响。结果表明光照强度为85%时,莪术挥发油和莪术醇含量最高,二者之间相关性显著。分析认为光照强度对莪术主要有效成分生物合成与积累影响显著,莪术挥发油和莪术醇生物合成的最适光照强度为85%。     

Asia I口蹄疫vp2蛋白单克隆抗体的制备及单抗竞争ELISA方法的建立

制备Asia I口蹄疫病毒vp2单克隆抗体(mAb)并建立了单抗竞争ELISA方法。用纯化的Asia I型口蹄疫病毒vp2重组蛋白免疫BALB/c小鼠, 将免疫小鼠的脾细胞与骨髓瘤SP2/0细胞融合, 采用间接ELISA和有限稀释法筛选杂交瘤细胞。分别用ELISA、Western blotting检测mAb腹水的效价及其特异性。筛选到杂交瘤细胞2株, 腹水效价均在100×29以上; 以纯化后的Asia I型口蹄疫病毒vp2重组蛋白作为抗原, 利用Asia I型口蹄疫病毒vp2单抗酶标物建立了竞争ELISA方法用来检测Asia I型口蹄疫抗体。临床应用表明, 该方法与UBI公司的口蹄疫全病毒抗体检测试剂盒总符合率达89.0%, 和荷兰赛迪公司的口蹄疫病毒LPB-ELISA抗体检测试剂盒总符合率达86.5%。     

Formation of monoclonal antibody against a major ginseng component, ginsenoside Rb1 and its characterization

The ratio of hapten and bovine serum albumin in an antigen conjugate was determined by matrix-assisted laser desorption/ionization mass spectrometry. A hybridoma secreting monoclonal antibody against ginsenoside Rb1 was produced by fusing splenocytes immunized with a ginsenoside Rb1- bovine serum albumin conjugate with HAT-sensitive mouse myeloma cell line, P3-X63-Ag8-653. A very small cross-reaction appeared with ginsenoside Rc and ginsenoside Rd. The full measuring range of the assay extends from 20 ngml-1 to 400 ngml-1 of ginsenoside Rb1. This revised version was published online in July 2006 with corrections to the Cover Date.     

Enzyme-linked immunosorbent assay of changes in serum levels of growth hormone (cGH) in common carps (Cyprinus carpio)

The aim of the present study was to purify the common native carp growth hormone (ncGH), produce monoclonal antibodies (mAbs) to common native carp growth hormone (ncGH), and further enhance the sensitivity of enzyme-linked immunosorbent assays (ELISA) for ncGH. Additionally, we investigated changes in serum ncGH levels in carps raised in different environmental conditions. The recombinant grass carp (Ctenopharyngodon idella) growth hormone was purified and used as antigen to immunize the rabbit. The natural ncGH was isolated from the pituitaries of common carp. SDS-PAGE and Western blot utilizing the polyclonal anti-rgcGH antibody confirmed the purification of ncGH from pituitaries. Purified ncGH was then used as an immunogen in the B lymphocyte hybridoma technique. A total of 14 hybridoma cell lines (FMU-cGH 1-14) were established that were able to stably secrete mAbs against ncGH. Among them, eight clones (FMU-cGH1-6, 12 and 13) were successfully used for Western blot while nine clones (FMU-cGH 1-7, 9 and 10) were used in fluorescent staining and immunohistochemistry. Epitope mapping by competitive ELISA demonstrated that these mAbs recognized five different epitopes. A sensitive sandwich ELISA for detection of ncGH was developed using FMU-cGH12 as the coating mAb and FMU-cGH6 as the enzyme labeled mAb. This detection system was found to be highly stable and sensitive, with detection levels of 70 pg/mL. Additionally, we found that serum ncGH levels in restricted food group and in the net cage group increased 6.9-and 5.8-fold, respectively, when compared to controls, demonstrating differences in the GH stress response in common carp under different living conditions.     

抗牙龈卟啉单胞菌血凝素2单克隆抗体的制备

目的制备抗牙龈卟啉单胞菌(Porphyromonas gingivalis,Pg)血凝素2(hemagglutinin-2,HA-2)的单克隆抗体(monoclonal antibody,mAb)。方法用重组HA-2(recombinant HA-2,rHA-2)免疫BALB/C小鼠,取其脾细胞与小鼠骨髓瘤细胞SP2/0融合,间接ELISA方法筛选杂交瘤细胞.用ELISA方法测效价。结果获得1株能够高效识别rHA-2的mAb,命名为4F11。此单克隆抗体的免疫球蛋白亚类为IgG1,效价达1?106。结论成功制备了重组牙龈卟啉单胞菌血凝素2的单克隆抗体mAb.将进一步用于牙龈卟啉单胞菌的诊断,并为牙周疾病的治疗研究奠定基础。     

邻氯青霉素单克隆抗体的制备及特性鉴定

采用碳化二亚胺法,将邻氯青霉素（cloxacillin）与牛血清白蛋白偶联制备免疫原,免疫BALB/c小鼠,经杂交瘤技术获得了一株能稳定分泌抗邻氯青霉素单克隆抗体的杂交瘤细胞株2H8-B1-F4。间接ELISA方法测定,抗体亚类为IgG1,其细胞上清抗体效价为1：1000,腹水效价为1：4×105。与其结构类似物苯唑青霉素、双氯青霉素的交叉反应率为21.3％和19.6％,和氨苄青霉素、羟氨苄青霉素和苄青霉素无交叉反应。体外传代培养和冻存复苏后抗体分泌稳定。为进一步研制检测邻氯青霉素的 ELISA试剂盒奠定基础。     

Enzyme-linked immunosorbent assay of changes in serum levels of growth hormone (cGH) in common carps (<Emphasis Type="Italic">Cyprinus carpio</Emphasis>)

The aim of the present study was to purify the common native carp growth hormone (ncGH), produce monoclonal antibodies (mAbs) to common native carp growth hormone (ncGH), and further enhance the sensitivity of enzyme-linked immunosorbent assays (ELISA) for ncGH. Additionally, we investigated changes in serum ncGH levels in carps raised in different environmental conditions. The recombinant grass carp (Ctenopharyngodon idella) growth hormone was purified and used as antigen to immunize the rabbit. The natural ncGH was isolated from the pituitaries of common carp. SDS-PAGE and Western blot utilizing the polyclonal anti-rgcGH antibody confirmed the purification of ncGH from pituitaries. Purified ncGH was then used as an immunogen in the B lymphocyte hybridoma technique. A total of 14 hybridoma cell lines (FMU-cGH 1–14) were established that were able to stably secrete mAbs against ncGH. Among them, eight clones (FMU-cGH1–6, 12 and 13) were successfully used for Western blot while nine clones (FMU-cGH 1–7, 9 and 10) were used in fluorescent staining and immunohistochemistry. Epitope mapping by competitive ELISA demonstrated that these mAbs recognized five different epitopes. A sensitive sandwich ELISA for detection of ncGH was developed using FMU-cGH12 as the coating mAb and FMU-cGH6 as the enzyme labeled mAb. This detection system was found to be highly stable and sensitive, with detection levels of 70 pg/mL. Additionally, we found that serum ncGH levels in restricted food group and in the net cage group increased 6.9-and 5.8-fold, respectively, when compared to controls, demonstrating differences in the GH stress response in common carp under different living conditions.     

利用hTM表达细胞株制备抗人血栓调节蛋白单克隆抗体

为了研制抗人血栓调节蛋白(hTM)的单克隆抗体(mAb),给经CHO细胞免疫的BALB/c小鼠腹腔注射环磷酰胺诱导其对CHO和CHO-TM5细胞的共同抗原表位产生免疫耐受,再用高效表达hTM的CHO-TM5常规免疫小鼠．细胞融合后,ELISA筛选分泌抗hTM的特异性mAb阳性克隆,并将其腹腔注射BALB/c小鼠诱生腹水．腹水中的mAb经亲和层析纯化后,采用ELISA、流式细胞术、免疫组织化学染色法及Western blotting对其进行特异性鉴定．结果显示,共获得了5株阳性克隆,其中2F7可稳定分泌IgG1亚型的mAb,腹水抗体效价为1×10_-6,含量为19.56 g/L．2F7在体内与正常组织的交叉反应极少,对HUVEC、CHO-TM5有特异性结合,并可识别细胞裂解液还原条件下分子质量为105 ku左右的蛋白质多肽．2F7的解离常数K_d约为1.22×10_-9 mol/L．实验结果表明,通过采用新的技术路线,直接应用hTM表达细胞株免疫小鼠,成功制备了具有高度特异性与高亲和力的抗hTM mAb,为其他来源困难的蛋白质mAb制备提供了可借鉴的技术方案,同时2F7的研究鉴定为进一步应用抗hTM mAb进行hTM生物学功能及临床意义研究提供了新的物质基础．     

Construction of recombinant monoclonal antibodies from a chicken hybridoma line secreting specific antibody

The chicken is a useful animal for the development of the specificantibodies against the mammalian conserved proteins. We generated twotypes of recombinant chicken monoclonal antibodies (mAbs), using a phagedisplay technique from a chicken hybridoma HUC2-13 which secreted themAb to the N-terminal of the mammalian prion protein (PrP). Althoughthe mAb HUC2-13 is a useful antibody for the prion research, thehybridoma produces a low level of antibody production. In order to producea large amount of the mAb, we have constructed a single chain fragmentvariable region (scF_V) mAb by using the variable heavy(V_H) and light (V_L)genes which were amplified by using the two primer pairs and theflexible linker. The two phage display mAbs (HUC2p3 and HUC2p5)expressed on a M13 filamentous phage and their soluble type mAbs(HUC2s3 and HUC2s5) were reacted with the PrP peptide antigen in theELISA. In the Western blot analysis, the mAbs HUC2p3 and HUC2s3 wereas reactive to PrP^c from mouse brains as the mAb HUC2-13 was. The nucleotide sequences of V_H and V_L genes from HUC2-13 and the two cloneswere identical except for only one residue. These results indicate that themethods presented here provide an effective tool for the improvement ofthe low levels of antibody production in the chicken hybridoma system.