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1.
本研究制备并鉴定了鼠抗粉尘螨变应原Der f 5的单克隆抗体(monoclonal antibody,McAb)。将质粒pET28a(+)-Der f 5转化ArcticExpress(DE3)感受态细胞,取单个菌落接种培养,加入IPTG诱导表达,经纯化获得Der f 5重组蛋白。利用Der f 5重组蛋白为免疫原,免疫BALB/c小鼠,取免疫小鼠脾脏细胞与其骨髓瘤细胞融合。通过间接ELISA法筛选特异性分泌抗体的杂交瘤细胞。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。通过间接ELISA、Western blotting鉴定该单克隆抗体的特性和交叉性。最终获得3株稳定分泌鼠抗粉尘螨变应原Der f 5的高效价单克隆抗体。研究分析表明该3株单抗均能识别重组Der f 5蛋白和天然的粉尘螨提取物。本实验成功制备了3株鼠抗粉尘螨变应原Der f 5的单克隆抗体,为建立粉尘螨主要变应原Der f 5检测及纯化方法奠定了基础。 相似文献
2.
目的:克隆表达粉尘螨变应原第7 组分(简称Der f 7)重组蛋白,制备抗Der f 7 单克隆抗体,并进行鉴定。方法:用pET28a(+)-Der f 7 原核表达体系表达Der f 7 重组蛋白,以此免疫BALB/ c 小鼠,将骨髓瘤细胞和脾细胞融合,经ELISA法筛选杂交瘤细胞。用杂交瘤细胞注射入小鼠腹腔,获得腹水,经蛋白A 琼脂糖介质纯化,后鉴定抗体的效价、纯度,采用免疫印迹法鉴定抗体的特异性。结果:获得三株稳定分泌重组Der f 7 单克隆抗体的杂交瘤细胞,产生的抗体纯度高,效价高于1 :243 000。Western blot 显示能很好地识别Der f 7 重组蛋白。为Der f 7 变应原的定量、定位及相关过敏性疾病的诊疗奠定基础。结论:成功获得粉尘螨变应原第7 组分(Der f7)重组蛋白单克隆抗体,且抗体效价纯度及特异性较好。 相似文献
3.
粉尘螨Der f18变应原的克隆表达、纯化及免疫学特性鉴定 总被引:1,自引:0,他引:1
通过对纯培养的粉尘螨提取总RNA,采用RT-PCR方法有效地扩增出Der f18片段,将Der f18连接到pET-24a表达载体上并转化到表达菌BL21(DE3)中,得到重组质粒pET-Der f18和重组工程菌.重组工程菌经IPTG诱导培养,高效表达出Der f18蛋白,SDS-PAGE结果显示表达产物约为52 kDa.表达产物经亲和层析纯化,用Western blot方法检测免疫学活性,结果表明目的蛋白具有良好的免疫原性. 相似文献
4.
目的克隆表达粉尘螨第五组变应原(Dermatophagoides farinae,Derf5)基因,并鉴定纯化蛋白免疫原性。方法提取活粉尘螨总RNA,扩增Derf5片段,PCR产物与克隆载体pMD18-T连接,转化入大肠埃希菌JM109,经酶切及测序鉴定获得pMD18-Der f5阳性菌株,再提取质粒进行双酶切,与表达载体pET-30a(+)连接,转化入大肠埃希菌BL21,异丙基-β-D-硫代半乳糖苷(IPTG)诱导表达。SDS-聚丙烯酰胺凝胶电泳(SDS-PAGE)和蛋白质印迹法(Western blotting)鉴定其表达效果,Ni-IDA亲和层析柱纯化蛋白,利用尘螨病人血清鉴定其免疫原性。结果构建了重组质粒pMD18-Derf5和pET30a-Der f5,SDS-PAGE结果表明Der f5基因在BL21中获得良好的可溶性表达,蛋白质分子量与理论值相符,纯化的蛋白与病人血清有良好的IgE结合活性。结论获得广州地区Der f5的原核表达载体,高效表达纯化重组蛋白,初步鉴定了该蛋白的免疫原性。 相似文献
5.
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。 相似文献
6.
目的在大肠杆菌中提高粉尘螨1类变应原(Derf1)的可溶性表达。方法用RT-PCR方法扩增得到Derf1的全长序列与成熟肽序列(mDerf1);以已知DerP5基因的前导序列替换Derf1前导序列和原酶序列,重新构建出rDerf1基因;将上述3个基因分别克隆入原核表达载体pGEX-4T-1中表达,经Western-blot对三者的表达产物进行分析鉴定。结果Western-blot表明,pGEX-Derf1与pGEX-mDerf1的表达产物分别为分子量约63000与51000的重组蛋白质,重组蛋白质主要存在于细胞裂解液的沉淀中。pGEX-rDerf1大量表达了可溶性目的蛋白质,分子量约53000,并被成功地分离纯化。以上三种表达产物均可被鼠抗GST抗体与螨过敏患者血清特异地识别。结论表达了含Derf1,mDerf1与rDerf1的三种GST融合蛋白质,它们均具免疫反应性,纯化获得了GST-rDerf1融合蛋白质,为后期的诊断及治疗奠定了基础。 相似文献
7.
目的 对粉尘螨(Dermatophagoides farinae)变应原进行分离和鉴定其特异性变应原组分. 方法 采用ELISA检测粉尘螨变应原的生物活性.按常规方法制备粉尘螨浸出液,经SDS-PAGE分离,测定各组分的相对分子质量(M,);同时用对螨过敏的60例病人混合血清(建立血清库)作探针进行Westem blot,鉴定其特异性变应原组分. 结果 SDS-PAGE显示粉尘螨有15条蛋白带,Mr在14×103-109×103之间,其中主带有9条,M,分别为109×103、100×103、86×103、62×103、56×103、36×103、28 x103、19×103、14×103;Western blot结果表明,浸出液中共有5条致敏条带,其M,分别为109×103、100×103、36×103、28 x 103、14×103;经ELISA检测粉尘螨浸出液具有生物活性. 结论 粉尘螨的特异性变应原有5条,分别为109×103、100×103、36×103、28×103、14×103,其浸出液有稳定的生物活性.该研究为开发适合我国人群的粉尘螨标准化试剂提供了试验依据. 相似文献
8.
目的了解不同地区粉尘螨Ⅰ类变应原(DerfⅠ)成熟肽段基因序列的变异性及其编码蛋白的化学及免疫学特征。方法从皖南地区分离鉴定的活粉尘螨,提取总RNA,采用RT—PCR扩增DerfⅠ成熟肽段基因,克隆到T载体测序确认。应用生物信息学软件对该基因进行初步分析。结果获得皖南地区两种不同基因型的DerfⅠ成熟肽段基因,与GenBank公布的其他地区DerfⅠ基因序列比较同源性在98.73%~99.84%之间;相应编码氨基酸序列的同源性在99.04%~100%之间,存在6个氨基酸残基变异位点,并影响其抗原表位的改变。结论不同地区DerfⅠ成熟肽段基因序列及其编码氨基酸序列存在差异,并对其免疫原性产生影响。克隆并分析研究我国各地的尘螨变应原基因序列及氨基酸序列变化.对于临床变应性疾病的诊治有重要的意义。 相似文献
9.
抗rhNDPK-A单克隆抗体的制备及鉴定 总被引:1,自引:2,他引:1
目的 :研制抗rhNDPK A (recombinanthumannucleosidediphosphatekinase A)单克隆抗体 (mAb) ,并鉴定其特性。 方法 :以纯化的rhNDPK A免疫BALB/c小鼠 ,采用杂交瘤技术制备抗rhNDPK AmAb ;用免疫双扩散鉴定Ig亚类 ;West ernblot鉴定mAb的特异性 ;间接ELISA检测mAb的腹水效价、亲和常数 ,并进行表位分析。结果 :获得 6株可分泌特异性mAb的抗rhNDPK A的杂交瘤细胞系 2D9、8C7、13E2、15D9、15E3和 2 0D9,Ig亚类均为IgG1;其效价为 1× 10 -4~5× 10 -6;亲和常数为 4 .5× 10 -9~ 2 .8× 10 -10 mol/L ;共有3个抗原表位。结论 :获得抗rhNDPK A的mAb ,为进一步用于临床诊断和实验研究创造了条件 相似文献
10.
目的:制备抗-HCV高变区1(HVR1)合成肽单克隆抗体(mAb),并对其特性进行鉴定。方法:以固相合成的HCV HVR1合成肽与牛血清白蛋白(BSA)偶联后,免疫8周龄的BALB/c小鼠。采用杂交瘤技术,取免疫小鼠的脾细胞与骨髓瘤细胞融合,制备抗-HCV HVR1 mAb。经HAT、HT选择培养及有限稀释法进行克隆化后,用相关的试剂盒鉴定小鼠mAb的Ig亚类;经中和抑制后用ELISA法检测mAb的特异性;用间接ELISA法检测mAb腹水的效价及相对亲和常数。结果:获得1株可分泌抗-HCV HVR1合成肽特异性mAb的杂交瘤细胞1A9G9F11。该株mAb的Ig亚类为IgG3;腹水效价为3.125×10-5;相对亲和常数为1.0×106L/mol。该株mAb与HBsAg、HBeAg、HBcAg、HAAg、牛血清白蛋白、酪蛋白和胸腺5肽均无交叉反应,与HCV HVR1合成肽-牛血清白蛋白出现特异性反应。结论:成功地建立了1株可分泌抗-HCV HVR1 mAb的杂交瘤细胞1A9G9F11,为进一步的实验研究提供了重要的制剂。 相似文献
11.
抗人内皮细胞特异性分子-1单克隆抗体的研制和初步鉴定 总被引:8,自引:1,他引:8
运用B淋巴细胞杂交瘤技术 ,以人内皮细胞特异性分子 1(ESM 1)蛋白为抗原 ,经PEG融合 ,有限稀释法筛选 ,获得了 7株稳定分泌抗人ESM 1的杂交瘤细胞株 ,其中 3A7细胞株特异性尤为显著 ,效价高达 1∶6 0 0 0。所分泌抗体亚型为IgG2b ,Westernblot结果表明对内皮细胞中的ESM 1蛋白及细胞培养上清中的ESM 1均可特异性识别。并观察到ESM 1主要分布在内皮细胞的细胞胞质伴胞核中。在肾组织中 ,ESM 1定位于血管内皮细胞 ,且肾癌标本中ESM 1阳性表达显著高于正常肾组织。免疫组化结果表明所获单抗具有一定的特异性和实用性。 相似文献
12.
Characterization of allergenic components from house dust mite Dermatophagoides siboney. Purification of Der s 1 and Der s 2 allergens 总被引:1,自引:0,他引:1
R. FERRÁNDIZ R. CASAS S. DREBORG R. EINARSSON I. BONACHEA M CHAPMAN 《Clinical and experimental allergy》1995,25(10):922-928
Background Allergic reactions to house dust miles of the genus Dermatophagoides play an important role in the pathogenesis of asthma and other atopic diseases. Dermatophagoides siboney has been described as a species from Cuba. Together with D. pteronyssinus and Blomia tropicalis , it is frequently found in house dust from homes of asthmatics.
Objective The aim of this study was to investigate the allergenic composition from the house dust mite D. siboney .
Methods The charactcrization of D. siboney extract was performed by SDS-gPAGE and immunoblotting. Purification of individual components was performed by affinity ehromatography.
Results At least 16 components between 13 and 98 k Da stained by Coomassie Blue were found. Using a panel of 35 sera from a topic mile sensitive patients 13 components reacted to different extent with patient IgE. Two components, 25 and 14 kDa, bound to specific IgE strongly and frequently, i.e. 80 and 91% of the patients, respectively. Affinity ehromatography using crossreacting monoclonal antibodies to group 1 and 2 allergens resulted in purified preparations of 25 and 14 kDa proteins, which showed IgE-binding with the majority of the human sera when tested by immune-dot.
Conclusion Based on the IgE binding profile of D. siboney and on the capacity to react with crossreacting monoclonal antibodies for groups I and 2, it is proposed to name these two allergens, 25 and 14 k Da, Der s 1 and Der s 2, respectively. 相似文献
Objective The aim of this study was to investigate the allergenic composition from the house dust mite D. siboney .
Methods The charactcrization of D. siboney extract was performed by SDS-gPAGE and immunoblotting. Purification of individual components was performed by affinity ehromatography.
Results At least 16 components between 13 and 98 k Da stained by Coomassie Blue were found. Using a panel of 35 sera from a topic mile sensitive patients 13 components reacted to different extent with patient IgE. Two components, 25 and 14 kDa, bound to specific IgE strongly and frequently, i.e. 80 and 91% of the patients, respectively. Affinity ehromatography using crossreacting monoclonal antibodies to group 1 and 2 allergens resulted in purified preparations of 25 and 14 kDa proteins, which showed IgE-binding with the majority of the human sera when tested by immune-dot.
Conclusion Based on the IgE binding profile of D. siboney and on the capacity to react with crossreacting monoclonal antibodies for groups I and 2, it is proposed to name these two allergens, 25 and 14 k Da, Der s 1 and Der s 2, respectively. 相似文献
13.
Protein sequence analysis and mapping of IgE and IgG epitopes of an allergenic 98-kDa Dermatophagoides farinae paramyosin, Der f 11 总被引:1,自引:0,他引:1
BACKGROUND: A 98-kDa mite paramyosin (Der f 11) from Dermatophagoides farinae (Df) is highly allergenic, and its cDNA (Df642) has been cloned. This paper describes the sequence characteristics and the mapping of the immunodominant human IgE and IgG epitopes of Der f 11. METHODS: The protein sequence analysis was performed with a combination of FASTA, GCG, and CLUSTAL W computing packages. The whole cDNA insert and its PCR-derived DNA fragments were generated and expressed in E. coli. These overlapping recombinant peptides (F1 to F5) were used for B-cell epitope mapping with 18 mite-allergic sera by dot immunoassays. RESULTS: Df642 cDNA encodes a partial sequence that contains the 2nd to 26th 28-residue repeats and lacks the N-terminus and the C-terminus. The sequence identity of Der f 11 with other known paramyosins is 34-60%. The dominant IgE epitopes are located in peptides F1 and F4, whereas the dominant IgG epitopes are located in peptides F1 and F2. These peptides are more reactive than whole rDf642. CONCLUSIONS: Mite paramyosin is very similar to other known paramyosins. The human IgE and IgG epitopes are scattered throughout the entire molecule. Data also indicate the presence of unique IgE and IgG epitopes in Der f 11. 相似文献
14.
H. YASUEDA A. SAITO Y. YANAGIHARA K. AKIYAMA M. TAKAOKA 《Clinical and experimental allergy》1996,26(2):171-177
Background The group 2 Dermatophagoides mite allergens. Der p 2 and Der f 2, were known to he highly crossreactive, and previous assays to measure Der p 2 and Der f 2 were not species-specific. Objective The aim of this study was to develop a monoclonal antibody-based ELISA (MoAb-ELISA) to specics-spccifically measure Der p 2 and Der f 2. Methods The MoAb-ELISA lor Der p 2 and Der f 2 was performed using species-specific MoAbs for Der p 2 and Der f 2 and a biotinylated second MoAb which recognized a common epitope on both Der p 2 and Der f 2. Rcsuits The assay was highly specics-spccific, reproducible and sensitive. Thirty-two house dust samples were assayed by the MoAb-ELISA for Der p 2 and Der f 2 and by a previously reported radioimmunoassay for Der 2 with rabbit anti-Der 2 antibodies. The summed values for Der p 2 and Der f 2 by the MoAb-ELISA detnonstrated a good correlation with the Der 2 values using the radioimmunoassay (r = 0.978). Furthermore, the proportion of the Der p 2 level in the total Der 2 level (Der p 2 divided by Der p 2 plus Der f 2) correlated well with that of the D. pteronyssinus mite number to the total Dermalophagoides mite number identificd by species (r = 0.970). Conclusion The MoAb-ELISA for Der p 2 and Der f 2, as well as that for Der p 1 and Der f 1, will be useful for the standardization of mite extracts and for the assessments of mite allergen exposure. 相似文献
15.
运动神经元单克隆抗体的制备及初步鉴定 总被引:1,自引:0,他引:1
以猪脊髓前角运动神经细胞制备的匀浆免疫Balb/c小鼠。按常规方法制备、筛选抗运动神经元单克隆抗体。总计35株杂交瘤细胞所分泌的McAb,与大鼠半月神经节细胞免疫组化反应均呈阴性,30株与脊髓前角运动细胞(Mn)呈阳性反应、其中5株McAbs免疫组化反应特异性较强,用ELISA方法测定其滴度在2048~4096之间,免疫双扩散法测定,5株杂交瘤均分泌IgG。 相似文献
16.
目的建立前列腺特异性膜抗原(PSMA)膜外区多肽杂交瘤细胞株,并对其分泌的PSMA单克隆抗体进行初步鉴定,为PSMA的功能研究和人源化抗体的制备奠定基础,以求进一步用于前列腺癌的诊断和治疗。方法使用人工合成多肽免疫BABL/c小鼠,采用PEG融合技术建立杂交瘤细胞株,制备单克隆抗体。通过免疫荧光法、酶联免疫吸附法及斑点金标法确定单克隆抗体的交叉反应性、亲和力及免疫球蛋白的类型和亚类。结果获得两株可稳定分泌PSMA单克隆抗体的杂交瘤细胞,4F4为IsG1类,1F1为IgC3类。两株单抗均能识别LNCap细胞表达的PSMA蛋白,与不表达PSMA的PC-3、SP2/0等细胞无交叉反应。杂交瘤细胞株1F1培养上清效价为1:40。腹水效价为1:6400;而杂交瘤细胞株4F4培养上清效价为1:80。腹水效价为1:8000。结论成功地制备出两株抗PSMA单克隆抗体,均具有良好的特异性和亲和力,为进一步建立免疫分析方法。进行PSMA相关研究奠定了基础。 相似文献