PIWIL系列蛋白多克隆抗体制备、鉴定及组织分布

目的 制备PIWIL蛋白多克隆抗体,鉴定其特异性,初步探讨其在人类正常及肿瘤组织中的分布。方法 合成特异性PIWIL多肽,以马来酰胺活化匙孔血蓝蛋白（KLH）作为载体构建多肽免疫原,通过致敏大白兔,制备兔抗人PIWIL多克隆抗体,用亲和层析法纯化抗体。用ELISA和Western blot方法进行抗体验证,应用人组织芯片进行PIWIL免疫组化研究。结果 通过构建系列PIWIL多肽-KLH载体复合物致敏大白兔,成功制备4个兔抗人PIWIL蛋白多克隆抗体,证实兔抗人PIWIL抗体可特异性识别PIWIL多肽,该抗体在大多数正常及肿瘤组织上皮来源细胞胞质中呈阳性染色。结论 成功制备系列兔抗人PIWIL多克隆抗体,为进一步研究PIWIL在miRNA/RNAi通路中的作用及在人类疾病中的意义提供了有利工具。     

兔抗人PIWIL4蛋白多克隆抗体的制备和鉴定

目的 制备兔抗人PIWIL4的多克隆抗体,并鉴定其特异性,应用组织芯片初步探讨其在人类正常及肿瘤组织中的分布.方法 合成特异性PIWIL 4多肽,以马来酰胺活化匙孔血蓝蛋白(KLH)作为载体构建多肽免疫原,通过致敏大白兔, 制备兔抗人PIWIL4多克隆抗体,然后用亲和层析法纯化抗体.用ELISA和western方法进行抗体验证,并应用人组织芯片进行PIWIL4的免疫组化研究.结果 通过构建P IWIL4多肽-KLH载体复合物致敏大白兔,我们制备了兔抗人PIWIL4蛋白多克隆抗体,经ELIS A 及Western blot证实兔抗人PIWIL4抗体可特异性识别PIWIL4多肽,在人组织芯片中通过免疫组化染色显示该抗体在BU部分正常组织和肿瘤组织中呈阳性染色.结论 本项研究成功制备兔抗人PIWIL4多克隆抗体,为进一步研究PIWIL4在人类疾病中的意义提供了有利工具.     

PIWIL4的克隆及其抗体制备和初步应用

目的 制备兔抗人PIWIL4的多克隆抗体,鉴定其特异性,并应用该抗体检测内源性PIWIL4在人各细胞系中的表达差异及细胞定位.方法 构建原核表达质粒pGEX-5X-1-PIWIL4,转化大肠杆菌BL21,PIWIL4蛋白经异丙基-β-D-硫代半乳糖苷(IPTG)诱导表达.融合蛋白通过切胶纯化后免疫家兔制备抗体血清.以间接酶联免疫吸附试验(ELISA)检测抗体效价,Western blot鉴定抗体特异性及检测PIWILA在各细胞系中的表达差异,免疫荧光染色观察PIWIL4的细胞定位.结果 成功构建原核表达质粒,表达并纯化PIWIL4蛋白.免疫大白兔后得到PIWIL4多克隆抗体,ELISA检测抗体效价为1:20 000,Western blot和免疫组化确定抗体具有高度特异性,并成功地应用该抗体检测到PIWIL4在人多种细胞系中的表达差异及细胞定位.结论 PIWIL4蛋白及其多克隆抗体的成功制备,为进一步研究PIWILA的生物学功能奠定了基础.     

PIWIL4的克隆及其抗体制备和初步应用

目的 制备兔抗人PIWIL4的多克隆抗体,鉴定其特异性,并应用该抗体检测内源性PIWIL4在人各细胞系中的表达差异及细胞定位.方法 构建原核表达质粒pGEX-5X-1-PIWIL4,转化大肠杆菌BL21,PIWIL4蛋白经异丙基-β-D-硫代半乳糖苷(IPTG)诱导表达.融合蛋白通过切胶纯化后免疫家兔制备抗体血清.以间接酶联免疫吸附试验(ELISA)检测抗体效价,Western blot鉴定抗体特异性及检测PIWILA在各细胞系中的表达差异,免疫荧光染色观察PIWIL4的细胞定位.结果 成功构建原核表达质粒,表达并纯化PIWIL4蛋白.免疫大白兔后得到PIWIL4多克隆抗体,ELISA检测抗体效价为1:20 000,Western blot和免疫组化确定抗体具有高度特异性,并成功地应用该抗体检测到PIWIL4在人多种细胞系中的表达差异及细胞定位.结论 PIWIL4蛋白及其多克隆抗体的成功制备,为进一步研究PIWILA的生物学功能奠定了基础.     

PIWIL4的克隆及其抗体制备和初步应用

目的制备兔抗人PIWIL4的多克隆抗体,鉴定其特异性,并应用该抗体检测内源性PIWIL4在人各细胞系中的表达差异及细胞定位。方法构建原核表达质粒pGEX-5X-1．PIWIL4,转化大肠杆菌BL21,PIWIL4蛋白经异丙基-β-D-硫代半乳糖苷（IPTG）诱导表达。融合蛋白通过切胶纯化后免疫家兔制备抗体血清。以间接酶联免疫吸附试验（ELISA）检测抗体效价,Westernblot鉴定抗体特异性及检测PIWIL4在各细胞系中的表达差异,免疫荧光染色观察PIWIL4的细胞定位。结果成功构建原核表达质粒,表达并纯化PIWIL4蛋白。免疫大白兔后得到PIWIL4多克隆抗体,ELISA检测抗体效价为1：20000,Westernblot和免疫组化确定抗体具有高度特异性,并成功地应用该抗体检测到PIWIL4在人多种细胞系中的表达差异及细胞定位。结论PIWIL4蛋白及其多克隆抗体的成功制备,为进一步研究PIWIL4的生物学功能奠定了基础。     

人Argonaute3蛋白：多克隆抗体制备、鉴定及组织芯片检测其在各种癌组织中的表达

目的:制备兔抗人Argonaute3(AGO3)的多克隆抗体,并鉴定其特异性,应用组织芯片初步探讨其在人类正常及肿瘤组织中的分布.方法:合成特异性AGO3多肽,以马来酰胺活化匙孔血蓝蛋白(KLH)作为载体构建多肽免疫原,通过致敏大白兔,制备兔抗人AGO3多克隆抗体,然后用亲和层析法纯化抗体.用ELISA和Western方法进行抗体验证,并应用人组织芯片进行AGO3的免疫组化研究.结果:通过构建AGO3多肽-KLH载体复合物致敏大白兔,我们制备了兔抗人AGO3蛋白多克隆抗体,末次抗血清效价为l:20 000,经ELISA及Western blot证实兔抗人AGO3抗体可特异性识别AGO3多肽,在人组织芯片中通过免疫组化染色显示该抗体在很多正常组织上皮细胞及肿瘤细胞胞浆中呈阳性染色.结论:本项研究成功制备兔抗人AGO3多克隆抗体,为进一步研究AGO3在微小RNA/RNA干扰通路中的作用及在人类疾病中的意义提供了有利工具.     

兔抗人CD1d分子α3结构域抗体的制备与鉴定

目的: 制备兔抗人CD1d分子α3结构域(hCD1d-α3)多克隆抗体.方法: PCR法扩增出人hCD1d-α3编码区基因, 将其克隆入原核表达载体pET28中, 转化大肠杆菌BL21(DE3), 用IPTG诱导重组蛋白的表达, 用Ni2 -NTA Agarose亲和层析法纯化重组蛋白, 以之为免疫原免疫家兔, 制备多克隆抗体, 并用ELISA、 Western blot及免疫组织化学法检测抗体.结果: 成功构建了hCD1d-α3原核表达载体pET28/hCD1d-α3, 高效表达并纯化hCD1d-α3蛋白, 间接ELISA检测所制备抗体的效价为1∶6 400, Western blot显示该抗体能与hCD1d特异结合, 免疫组织化学法检测结果表明该抗体识别人小肠组织中的天然hCD1d.结论: 通过制备重组hCD1d-α3蛋白为免疫原, 免疫家兔, 成功地制备了效价高、特异性好的抗hCD1d-α3多克隆抗体.     

兔抗人硒蛋白P抗体的制备与鉴定

目的 :以原核表达的人硒蛋白P片段 (HSelP)制备其兔多克隆抗体并进行鉴定。方法 :在E .coli中诱导表达HSelP片段 ,经DEAEfastflow和Ni NTA Agarose柱层析纯化后 ,以其为免疫原制备兔抗HSelP抗体 ,并以Westernblot鉴定抗体的特异性。结果 :成功地表达并纯化了HSelP ,制备的兔抗HSelP抗体可有效地检测天然的SelP。结论 :以原核表达并纯化的HSelP为免疫原 ,成功地制备了兔抗该蛋白的抗体 ,Westernblot鉴定特异性良好。为进一步研究硒蛋白P的功能、分布及建立较简便的检测方法打下了基础     

兔抗重组人钙网蛋白抗体的制备及其特性鉴定

目的:制备兔抗人钙网蛋白抗体并进行特性鉴定。方法:用PCR法扩增人钙网蛋白(CRT)基因,并克隆至pET32a表达载体中。以重组质粒pET32a/hCRT转化大肠杆菌BL-21(DE3),用IPTG诱导重组蛋白的表达,通过Ni2+-NTA琼脂糖凝胶柱亲和层析纯化目的蛋白。以纯化的hCRT为免疫原免疫新西兰大白兔制备抗体,用ELISA法、Westernblot和免疫组化染色法检测抗体的效价和特异性。结果:成功地表达并纯化hCRT重组蛋白。以纯化的重组hCRT免疫新西兰大白兔制备的抗体,ELISA检测其效价为1∶51 200,Western blot分析显示,该抗体能与hCRT特异性结合。免疫组化染色法检测结果表明,该抗体能识别天然的hCRT。结论:以重组hCRT为免疫原,成功地制备效价高、特异性好的兔抗hCRT抗体,为进一步进行钙网蛋白的检测及其临床应用研究奠定了基础。     

釉成熟蛋白Amelotin抗体的制备和初步鉴定

目的:表达并纯化小鼠釉成熟蛋白(Amelotin), 制备多克隆抗体, 并进行初步鉴定.方法:RT-PCR获得Amelotin成熟肽片段, 构建pET32a-Amelotin, IPTG诱导表达Amelotin, 纯化后免疫新西兰大白兔制备多克隆抗体, ELISA检测抗体滴度.Western blot和免疫组织化学鉴定抗体特异性.结果:成功构建了Amelotin重组表达载体pET32a-Amelotin,表达的重组蛋白纯化后免疫新西兰大白兔, 得到的多克隆抗体ELISA显示抗体效价可以达到1:12 800.Western blot分析表明该抗体能特异结合Amelotin, 免疫组化分析表明自制的抗体能特异的与Amelotin相互作用.结论:以纯化的Amelotin为免疫原, 成功地制备了效价及特异性较高的兔抗Amelotin抗体,为进一步建立简便的Amelotin检测方法及研究Amelotin生物学功能奠定了良好的基础.     

Identification and Characterization of TspA, a Major CD4+ T-Cell- and B-Cell-Stimulating Neisseria-Specific Antigen

In search for novel T-cell immunogens involved in protection against invasive meningococcal disease, we screened fractionated proteins of Neisseria meningitidis (strain SD, B:15:P1.16) by using peripheral blood mononuclear cells (PBMCs) and specific T-cell lines obtained from normal individuals and patients convalescing from N. meningitidis infection. Proteins of iron-depleted meningococci produced higher PBMC proliferation indices than proteins of iron-replete organisms, indicating that iron-regulated proteins are T-cell immunogens. Insoluble proteins of the iron-depleted cells, which produced better T-cell stimulation than soluble ones, were fractionated by using sodium dodecyl sulfate-polyacrylamide gels and recovered as five fractions (F1 to F5) corresponding to decreasing molecular weight ranges. The proteins were purified (by elution and precipitation) or electroblotted onto nitrocellulose membranes (dissolved and precipitated) before use in further T-cell proliferation assays. One of the fractions (F1), containing high-molecular-mass proteins (>130 kDa), consistently showed the strongest T-cell proliferation responses in all of the T-cell lines examined. F1 proteins were subdivided into four smaller fractions (F1A to F1D) which were reexamined in T-cell proliferation assays, and F1C induced the strongest responses in patients' T-cell lines. Rabbit polyclonal antibodies to F1C components were used to screen a genomic expression library of N. meningitidis. Two major clones (C1 and C24) of recombinant meningococcal DNA were identified and fully sequenced. Sequence analysis showed that C24 (1,874 bp) consisted of a single open reading frame (ORF), which was included in clone C1 (2, 778 bp). The strong CD4(+) T-cell-stimulating effect of the polypeptide product of this ORF (named TspA) was confirmed, using a patient T-cell line. Immunogenicity for B cells was confirmed by showing that convalescent patients' serum antibodies recognized TspA on Western blots. Additional genetic sequence downstream of C24 was obtained from the meningococcal genomic sequence database (Sanger Centre), enabling the whole gene of 2,761 bp to be reconstructed. The DNA and deduced amino acid sequence data for tspA failed to show significant homology to any known gene, except for a corresponding (uncharacterized) gene in Neisseria gonorrhoeae genome sequences, suggesting that tspA is unique to the genus Neisseria. The DNA and deduced amino acid sequence of the second ORF of clone C1 showed significant homology to gloA, encoding glyoxalase I enzyme, of Salmonella typhimurium and Escherichia coli. Thus, we have identified a novel neisserial protein (TspA) which proved to be a strong CD4(+) T-cell- and B-cell-stimulating immunogen with potential as a possible vaccine candidate.     

Cloning,heterologous expression in Escherichia coli and characterization of a protein disulfide isomerase from Fasciola hepatica

A Fasciola hepatica cDNA clone of 1752 bp was isolated from an adult worm cDNA expression library by immunological screening using a rabbit serum against the excretory-secretory antigens. The nucleotide sequence of the cDNA revealed the presence of an open reading frame of 489 codons which encoded a 55 kDa polypeptide, showing a high degree of homology to protein disulfide isomerases. This putative antioxidant protein cDNA was expressed in Escherichia coli as a GST fusion protein. The cleaved recombinant protein was shown to be biologically active in vitro by mediating the oxidative refolding of reduced RNase. Immunoblotting studies using a specific antiserum raised against the recombinant protein showed the presence of a polypeptide of similar molecular mass in the excretory-secretory extract of the adult parasite. The extracellular location of this protein was also supported by the specific immune responses found against this protein in F. hepatica experimentally infected rabbits.     

Antisera against Purified Asialo-Orosomucoid and Asialo-Cholinesterase

Rabbits were immunized with highly purified desialylated human serum cholinesterase and orosomucoid. In immunoelectrophoresis and immunodiffusion the resulting antibodies had precipitation properties which were identical to those of antibodies against the native proteins. Spurring between native and asialo-proteins was not seen. A linear correlation was observed between the rocket height obtained with the antiserum raised against the asialo-protein and the rocket height with a normal antiserum. A monospecific antiserum against cholinesterase was obtained without absorption. The use of desialylated glycoproteins as immunogens for the production of monospecific antisera is discussed.     

抗人转录因子DP3和TFDP1多肽抗体的制备

目的: 制备兔抗人转录因子TFDP3、 TFDP1的多克隆抗体, 并鉴定其反应性及特异性.方法: 选择TFDP3和TFDP1差异较大肽段, 利用人工合成多肽免疫家兔, 采用真核表达载体瞬时转染HEK293细胞表达TFDP3和TFDP1真核蛋白, 通过Western blot分析抗体的反应性和特异性.结果: 通过氨基酸序列比对选择TFDP3 17-26, TFDP1 17-32氨基酸残基合成多肽, 制备了兔抗人TFDP3、 TFDP1多肽抗体, Western blot检测显示, 抗TFDP3抗体可以特异性识别TFDP3, 而抗TFDP1抗体既可识别TFDP1又可与TFDP3结合.结论: 制备了兔抗人TFD31和TFDP1的多肽抗体, 且TFDP3抗体与TFDP1无交叉反应.     

Fibronectin-Binding Protein of Borrelia hermsii Expressed in the Blood of Mice with Relapsing Fever

To identify and characterize surface proteins expressed by the relapsing fever (RF) agent Borrelia hermsii in the blood of infected mice, we used a cell-free filtrate of their blood to immunize congenic naive mice. The resultant antiserum was used for Western blotting of cell lysates, and gel slices corresponding to reactive bands were subjected to liquid chromatography-tandem mass spectrometry, followed by a search of the proteome database with the peptides. One of the immunogens was identified as the BHA007 protein, which is encoded by a 174-kb linear plasmid. BHA007 had sequence features of lipoproteins, was surface exposed by the criteria of in situ protease susceptibility and agglutination of Vtp⁻ cells by anti-BHA007 antibodies, and was not essential for in vitro growth. BHA007 elicited antibodies during experimental infection of mice, but immunization with recombinant protein did not confer protection against needle-delivered infection. Open reading frames (ORFs) orthologous to BHA007 were found on large plasmids of other RF species, including the coding sequences for the CihC proteins of Borrelia duttonii and B. recurrentis, but not in Lyme disease Borrelia species. Recombinant BHA007 bound both human and bovine fibronectin with K_d (dissociation constant) values of 22 and 33 nM, respectively, and bound to C4-binding protein with less affinity. The distant homology of BHA007 and its orthologs to BBK32 proteins of Lyme disease species, as well as to previously described BBK32-like proteins in relapsing fever species, indicates that BHA007 is a member of a large family of multifunctional proteins in Borrelia species that bind to fibronectin as well as other host proteins.