小鼠OC-STAMP蛋白表达、纯化、抗体制备及鉴定

目的 OC-STAMP蛋白是一种功能尚不明确的六次跨膜蛋白,通过制备多克隆抗体来为进一步研究其功能奠定基础.方法 采用PCR技术扩增出目的基因,将其克隆到pGEX-4T-1原核表达载体中.经IPTG诱导后,重组质粒pGEX-4T-1/OC-STAMP表达含重组谷胱甘肽转移酶（GST）的融合蛋白GST-OC-STAMP.GST-OC-STAMP融合蛋白经纯化后免疫新西兰大白兔,制备多克隆抗体.此后应用ELISA及Western blot方法鉴定该抗体.结果 pGEX-4T-1/OC-STAMP重组质粒构建成功,并通过原核表达获得达到免疫要求的融合蛋白.免疫所得抗体血清经间接ELISA法、Western blot检测,确定获得了高效价的小鼠OC-STAMP多克隆抗体.结论 成功制备了小鼠OC-STAMP抗体,为进一步研究基因功能奠定了基础.     

肺炎链球菌SPD1672蛋白EL4功能环的原核表达及多克隆抗血清制备

目的原核表达肺炎链球菌SPD1672蛋白膜外EL4功能环,制备并鉴定其多克隆抗血清。方法生物信息学分析SPD1672蛋白结构功能区,用p Cold TF质粒构建含EL4功能环的原核表达载体,IPTG诱导蛋白质表达后行镍柱纯化。经HRV 3C蛋白酶酶切、鉴定后,免疫新西兰大白兔以制备多克隆抗血清,间接ELISA鉴定效价,western blot鉴定抗血清与肺炎链球菌D39菌株天然蛋白质的亲合力。结果 EL4环可能为SPD1672蛋白酶活性中心。成功构建p Cold TF-SPD1672EL4原核表达载体,诱导表达后获得纯度大于95%的重组融合目的蛋白质。该蛋白质免疫新西兰大白兔后获得效价达到5.12×106的多克隆抗血清,此抗血清与重组的SPD1672EL4蛋白及肺炎链球菌中天然SPD1672蛋白有较好的亲合力。结论成功获得高纯度的肺炎链球菌SPD1672EL4蛋白及其特异的多克隆抗血清,为进一步对SPD1672蛋白的结构与功能研究奠定了基础。     

改良型TAT-VP3融合蛋白的原核表达纯化及多克隆抗体的制备

目的表达、纯化改良型TAT-VP3融合蛋白,并制备其多克隆抗体。方法利用原核表达载体PGEX-6P-1/改良型TAT-VP3在大肠杆菌Rosetta（DE3）中表达,经GST标签纯化树脂纯化蛋白,并用PreScission Protease酶切除标签,以纯化的蛋白免疫新西兰大白兔,获得改良型TAT-VP3融合蛋白的多克隆抗体。用ELISA进行效价检测,Western blotting鉴定其特异性。结果诱导表达并纯化了改良型TAT-VP3融合蛋白,纯度大于90%,蛋白浓度为1.2mg/ml。制备了该蛋白的多克隆抗体,ELISA表明多克隆抗体效价为1：32000,Western blotting证明多克隆抗体的特异性良好。结论成功纯化出改良型TAT-VP3融合蛋白,并制备出高效价、高特异性的多克隆抗体,为进一步研究该蛋白的体内外抗肿瘤活性及作用机制奠定了基础。     

a-N-乙酰半乳糖胺酶多克隆抗体的制备及特异性鉴定

目的制备a-N-乙酰半乳糖胺酶(NAGA)的高效价高特异性的兔多克隆抗体。方法利用pET22b-NA-GA/BL21(DE3)工程菌株表达NAGA,经Ni2+Sepharose 6 FF亲合层析,Phenyl Sepharose 6 FF疏水层析两步纯化,得到纯度95%的NAGA作为抗原免疫新西兰白兔,获得NAGA的兔抗血清,并经HiTrap rProtein A柱纯化获得高效价高特异性的抗体;用间接ELISA法检测抗体效价,用Western blotting评价抗体特异性。结果制备得到的NAGA兔多克隆抗体血清效价为1×106,经过rProtein A柱纯化后抗体蛋白纯度95%,效价为1×105;Western blotting显示:该NAGA兔多克隆抗体只与NAGA发生特异性反应。结论获得了NAGA的高效价高特异性的兔多克隆抗体。     

抗热休克蛋白72多克隆抗体血清的制备和检测

目的 探讨在大肠杆菌中表达人热休克蛋白72（hHSP72）与组氨酸（His）的融合蛋白并制备其抗体血清的方法。方法 将hHSP72片断插入His融合表达载体pPROEX-1^TM，重组载体酶切鉴定后，在大肠杆菌中经异丙基-β-D-硫代半乳糖苷（IPTG）诱导表达获得His-hHSP72融合蛋白。采用纯化后的HSP72免疫新西兰白兔，制备抗血清；蛋白质免疫印迹法（Western blot）检测重组抗原的免疫活性。结果 重组质粒酶切鉴定结果表明，hHSP72基因已正确插入到pPROEX-1^TM中，经IPTG诱导后，表达出分子质量约为73ku的蛋白，获得了效价为1：100000的多克隆抗体。Western blot检测证明，所制备的多克隆抗体可以与hHSP72特异性结合，其效价高于市售的单克隆抗体。结论 用hHSP72片断在大肠杆菌中能成功表达，并能制备得到多克隆抗体；这种多克隆抗体是一种新的高特异性和高灵敏度的试剂。     

无标签NT-proBNP重组蛋白的获得及多克隆抗体的制备

摘要：目的：通过原核表达,获得不带标签的NT-proBNP重组蛋白,并用其免疫新西兰大白兔,制备兔抗NT-proBNP抗体。 方法：从重组菌pET-32a(+)-NT-proBNP提取重组质粒,通过PCR扩增出目的DNA片段,插入pCold TF载体,转化入大肠埃希菌BL21(DE3),经IPTG诱导表达融合蛋白。经镍柱亲和纯化、HRV 3C蛋白酶酶切、镍柱亲和纯化,制备不带标签的纯蛋白质,并用临床商品化试剂盒验证其抗原性。用该蛋白质免疫新西兰大白兔制备抗体,western blot鉴定其特异性。 结果：成功获得高纯度的不带标签的NT-proBNP蛋白,该蛋白质能被商品化的试剂盒识别。用该蛋白质免疫新西兰大白兔成功制备出高效价高特异的抗体。 结论：成功制备高纯度的无标签NT-proBNP蛋白及其多克隆抗体,为NT-proBNP在临床上的广泛应用奠定了基础。     

抗人S100A7抗体的制备

目的 制备兔抗人S100A7（hS100A7）多克隆抗体。方法制备原核表达重组人S100A7,用纯化的hs100A7为免疫原免疫新西兰大白兔,制备兔抗人S100A7抗体,并以问接ELISA测定抗体效价,以Westernblot和免疫组织化学法鉴定抗体的特异性。结果成功制备了重组人S100A7及其抗体,ELISA结果显示抗体效价达1：16000,Western blot和组织化学法分析表明该抗体能特异结合hS100A7。结论以纯化的重组人S100A7为免疫原,成功地制备了效价高、特异性强的兔抗人S100A7抗体。     

人KIAA1199蛋白表达、纯化、抗体制备及鉴定

目的 KIAA1199是一种功能未知的胞浆蛋白,通过制备多克隆抗体来为进一步研究其功能奠定基础。方法采用PCR技术扩增出目的基因,将其克隆到pMAL-C2X和pGEX-5X-1原核表达载体中。经IPTG诱导后,重组质粒pMAL-C2X/KIAA1199和pGEX-5X-1/KIAA1199,分别表达含麦芽糖结合蛋白(MBP)的MBP-KIAA1199融合蛋白和含重组谷胱甘肽转移酶(GST)的融合蛋白GST-KIAA1199。其中,MBP-KIAA1199融合蛋白经纯化后,免疫新西兰大白兔,制备多克隆抗体;GST-KIAA1199融合蛋白用于检测抗体特异性。此后应用ELISA及Westernblot方法鉴定该抗体。结果 pMAL-C2X/KIAA1199和pGEX-5X-1/KI-AA1199两个重组质粒构建成功,并获得了高效价的特异性多克隆抗体。结论成功制备了KIAA1199抗体,为进一步研究基因功能奠定了基础。     

登革病毒1型E蛋白的原核细胞表达及多克隆抗体的制备

目的构建登革病毒1型（DENV-1）E蛋白的原核细胞表达载体并进行原核细胞表达,并制备其多克隆抗体。方法利用聚合酶链反应（PCR）扩增DENV-1E蛋白序列,经酶切后将其插入原核细胞表达载体pET-32a（＋）,构建重组质粒pET-32-D1-E。重组质粒转化E.Coli Rosetta（DE3）感受态细胞,目的蛋白经异丙基-D-硫代半乳糖苷（IPTG）诱导表达,纯化后采用十二烷基硫酸钠聚丙烯酰胺凝胶电泳（SDS-PAGE）初步分析蛋白表达情况,并用纯化后的表达蛋白免疫家兔,制备该蛋白的多克隆抗血清,用间接酶联免疫吸附测定（ELISA）检测抗体的效价,Western blot检测抗体的特异性。结果成功构建了pET-32-D1-E原核细胞表达重组质粒,DENV-1E蛋白获得高效表达;纯化后的重组蛋白免疫家兔获得的特异性抗血清效价为1∶25 600,Western blot证实其特异性良好。结论成功构建了DENV-1E蛋白的原核细胞表达载体,并制备了可用于DENV快速检测的高效多克隆抗体。     

Galectin-7多克隆抗体的制备与鉴定

目的 制备鼠抗重组半乳糖凝集素7(Galectin-7)多克隆抗体及其在膀胱癌组织中特异性鉴定。方法 PCR法从人包皮组织中扩增Galectin-7基因,并构建到pET28a表达载体中,使用IPTG诱导重组蛋白的表达,通过镍柱亲和层析纯化获得Galectin-7蛋白。以纯化的Galectin-7蛋白混合福氏完全佐剂免疫Balb/C小鼠制备抗体,并用ELISA,Western blot及免疫组织化学法检测抗体。结果 成功表达、纯化了Galectin-7重组蛋白,ELISA检测Galectin-7蛋白免疫的小鼠血清效价为1:32 000,Western blot显示该抗体能与天然的Galectin-7特异结合,免疫组织化学法检测结果表明该抗体识别人膀胱肿瘤组织的天然Galectin-7。结论 通过制备重组Galectin-7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Galectin-7多克隆抗体。     

重组人胱抑素C及其多克隆抗体的制备

目的探讨重组人胱抑素C（Cys C）及其多克隆抗体的制备。方法根据大肠埃希菌编码蛋白的特性设计Cys C编码基因序列,人工合成目的基因,并将其在大肠埃希菌中表达,目的蛋白经亲和层析纯化后免疫新西兰大白兔;采用Western blot和酶联免疫吸附测定（ELISA）法检测兔血清重组人Cys C及其多克隆抗体。结果制备的重组人Cys C纯度达90%以上,抗重组人Cys C抗体具有很好的结合效价和特异性。结论制备的重组人Cys C及其抗体可用于进一步的实验研究和临床应用。     

人缺失型Midkine重组蛋白的纯化及多克隆抗体的制备

目的获得兔抗人缺失型Midkine(t MK)的多克隆抗体,并将其初步应用于临床检测。方法将人t MK蛋白经亲和层析法纯化,并将其作为抗原免疫新西兰大白兔,获得兔抗人血清,经饱和硫酸铵纯化,获得初步纯化的兔抗人t MK多克隆抗体,用免疫组织化学和蛋白印迹(Western blot)试验检测抗体的灵敏度和特异性。结果获得初步纯化的兔抗人t MK特异性多克隆抗体,该抗体能识别天然人t MK蛋白。结论制备的t MK多克隆抗体可初步用于临床检测。     

Induction of IgG antibodies against GD3 ganglioside in rabbits by an anti-idiotypic monoclonal antibody.

Anti-idiotypic MAb were raised in syngeneic mice against a mouse MAb recognizing GD3 ganglioside (MAb R24). Two anti-idiotypic MAb, designated BEC2 and BEC3, recognized distinct determinants on MAb R24 that mapped near or within the GD3-binding site. New Zealand white rabbits, which express GD3 on normal tissues, were immunized with either BEC2, BEC3, or control MAb FLOPC-21. All rabbits developed high and equivalent titers of antibodies against mouse immunoglobulins. Immunization with BEC2 and BEC3 induced rabbit antibodies expressing R24 idiotype as demonstrated by their ability to inhibit BEC2 binding to R24. Antibodies (IgG and IgM) reacting with GD3 developed in five of eight rabbits immunized with BEC2 but not in rabbits immunized with BEC3 or with control MAb. Serum antibodies against GD3 did not cross-react with other gangliosides. These results show that MAb BEC2 can mimic GD3 ganglioside and can induce antibodies against GD3 ganglioside despite expression of GD3 on normal rabbit tissue.     

Immunoassay with fluorescein-labelled antigens--device of a method and its clinical application.

A simple, sensitive, highly reproducible method for assay of antibodies using fluorescein-labelled antigens according to the method by Farr is described. We measured titers of anti-BSA antibodies and antigen binding capacity of sera in BSA immunized rabbits by fluorometric assay with fluorescein isothiocyanate (FITC) labelled BSA, and obtained highly reproducible and quantitative results. The resultd times more sensitive than the results from single radial immunodiffusion. FITC-labelled double or single stranded calf thymus DNA was incubated with sera of patients with systemic lupus erythematosus and New Zealand Black mice. Both anti-double and single stranded DNA antibodies were detected in sera of systemic lupus erythematosus, but only anti-single stranded DNA antibodies in sera of New Zealand Black mice.     

Immune response to moxalactam in rabbits and in humans

Three of 23 New Zealand white rabbits immunized with moxalactam or bovine serum albumin (BSA)-moxalactam conjugates produced specific antimoxalactam antibodies. Rabbits that produced antimoxalactam had been immunized, by a novel approach, with heat-aggregated BSA-moxalactam conjugates containing Corynebacterium parvum as adjuvant. Use of liposomes to augment antibody response in the rabbits was successful for the production of anti-BSA antibodies, but failed to result in production of antimoxalactam. One antimoxalactam was chosen for further study, was specifically inhibited with moxalactam (10(-5) mol/L), and did not cross-react with any of the 11 other cephalosporins or eight penicillins tested (in concentrations of 10(-2) mol/L). In addition, the antibody did not demonstrate any carrier specificity. One of eight humans receiving intravenous moxalactam therapy developed a low titer, low avidity antimoxalactam. This patient was a "good responder," inasmuch as he also produced three transfusion-stimulated alloantibodies to red cell antigens during the study. Although the patient developed the antimoxalactam antibody while the drug was being administered, there was no evident adverse clinical reaction. This is the first report of antimoxalactam produced either in experimental animals or in humans. Our data indicate that moxalactam may be a relatively poor immunogen in rabbits requiring special immunization protocols. The one antibody studied does not cross-react with other structurally related antibiotics. Although human antimoxalactam may be produced, no adverse effects were detected in the one case observed.     

Increased expression of heat shock protein 65 coincides with a population of infiltrating T lymphocytes in atherosclerotic lesions of rabbits specifically responding to heat shock protein 65.

We have shown previously that atherosclerotic lesions can be induced in normocholesterolemic rabbits by immunization with mycobacterial heat shock protein 65 (hsp65), which has a high degree of sequence homology with mammalian hsp60. To investigate a possible relationship between hsp60 expression and the antigenic specificities of infiltrating T cells in the lesion, 38 New Zealand White rabbits were treated either by immunization with recombinant mycobacterial hsp65 or by administration of a 0.2% cholesterol diet. Atherosclerotic lesions were observed after 16 wk, particularly in the aortic arch and arterial bifurcations of rabbits immunized with hsp65 or fed with a cholesterol-rich diet. Hsp65 staining of aortas showed a heterogeneous distribution, and significantly increased staining intensity in atherosclerotic lesions compared to aortic media or adventitia. This abundantly expressed hsp65 was observed in atherosclerotic lesions induced by hsp65 immunization as well as those induced by cholesterol-rich diet alone. Interestingly, a population of the T lymphocytes isolated from all forms of atherosclerotic lesions specifically responded to hsp65 in vitro. IL-2-expanded T cell lines derived from atherosclerotic lesions showed a significantly higher hsp65 reactivity than those developed from peripheral blood of the same donor. Furthermore, levels of circulating antibodies and numbers of spleen cells specifically reacting against hsp65 were elevated in all experimental animals. Flow cytometric analysis of spleen cells showed elevated immune response-associated antigen expression in treated animals. In conclusion, increased hsp65 expression in intimal cells and the presence of hsp65-specific T cells in blood and in atherosclerotic lesions may be important in initiating the development of atherosclerosis and perpetuating the lesions.     

CHARACTERISTICS OF STREPTOCOCCAL GROUP-SPECIFIC ANTIBODY ISOLATED FROM HYPERIMMUNE RABBITS

Intravenous immunization of New Zealand red rabbits with streptococcal group-specific bacterial vaccines yielded sera which possessed markedly elevated γ-globulin. The sera of one rabbit immunized with Group A-variant vaccine possessed 55 mg/ml of γ-globulin. The bulk of this γ-globulin, identified as γ_G-globulin, was homogeneous by zone electrophoresis and of specificity directed against the Group A-variant carbohydrate antigen. L chains isolated from specific antibody obtained from an immune precipitate were distributed as a single band on starch gel electrophoresis, whereas the normal γ-globulin traveled as a diffuse smear. These data suggest that the rabbit streptococcal Group A-variant antibodies possess a limited range of physicochemical properties and electrophoretic mobility compared to that generally observed for the normal complement of γ-globulin.     

抗人白细胞介素31多克隆抗体的制备及活性鉴定

目的：采用在原核表达系统表达的人IL-31蛋白免疫新西兰兔，制备兔抗人IL-31多克隆抗体。方法：利用IPTG诱导hIL-31在大肠杆菌中表达，纯化hIL-31重组蛋白，免疫新西兰兔制备抗hIL-31多克隆抗体。Western-blot 鉴定抗体的特异性，ELISA法测定抗体效价。荧光定量PCR检测多克隆抗体对IL-31诱导MIP-3β分泌的阻断效应。结果：人IL-31经IPTG诱导后可在大肠杆菌中大量表达，表达量占细菌总蛋白的30%，纯化后的蛋白纯度高；IL-31重组蛋白免疫新西兰兔，通过抗体效价测定，获得了效价达1：2560的多克隆抗体，可阻断IL-31刺激的MIP-3β的分泌。结论：原核表达的hIL-31蛋白能刺激家兔产生抗体，其多克隆抗体的效价高，具有阻断IL-31作用的生物学活性。