4株抗旋毛虫单克隆抗体细胞系的建立与初步特性鉴定

为了筛选旋毛虫保护性抗原,建立了4株分泌抗旋毛虫单克隆抗体的细胞株。其中2G_3和2C_(10)的靶抗原为旋毛虫幼虫表膜。免疫球蛋白类型及亚类鉴定表明2G_3和2C_(10)均为IgG_1,1D_5为IgG_3,1C_9为IgM。除了2C_(10)和IC_9对伊氏锥虫可溶性抗原呈现阳性反应外,未见对猪圆线虫、猪囊尾蚴、伊氏锥虫表膜抗原和正常猪肉反应、4株细胞连续培养已达30余代,仍     

血吸虫病免疫病理研究进展

血吸虫病主要病理变化是宿主肝组织内虫卵的沉积诱发虫卵肉芽肿及其后的纤维化病变。在动物模型的相关研究已显示Th1细胞主要参与血吸虫虫体抗原的免疫调节反应，而虫卵衍生抗原主要介导Th2细胞免疫反应。研究证明Th1细胞、Th2细胞、巨噬细胞、Treg细胞和IL-17分泌型淋巴细胞对调节虫卵肉芽肿反应和肝脏的纤维化过程起重要作用。     

体外介导白细胞杀伤日本血吸虫童虫的单克隆抗体

本文报道了一种在体外具有介导白细胞杀伤日本血吸虫童虫的单克隆抗体(AD_(12)F_6),经成虫冰冻切片免疫荧光试验(IFA)法证明,其靶抗原在成虫表皮。与日本血吸虫尾蚴、虫卵冰冻切片及丝虫冰冻切片、食蟹猴疟原虫血片及利什曼鞭与体玻片的IFA 试验均呈阴性反应。与培养3小时的血吸虫童虫共同温育,并进行IFA 试验,童虫表膜出现亮绿的特异荧光,其内容物则呈红色阴性反应,酶联免疫印渍试验表明,此单克隆抗体能识别ASE抗原中分子量为23K的部份,体外细胞杀伤试验证明,在有补体参与下,AD_(12)F_6对3小时童虫的杀伤率为 64％,对照血清为20％。     

日本血吸虫病感染小鼠的T细胞辅助活力变动的初步观察

体外测定T细胞辅助活力是近年来发展起来的一种细胞免疫观察方法。Ramalho-Pinto等(1979)在曼氏血吸虫感染小鼠上首先研究了这种感染早期的应答——对童虫的辅助T细胞应答。本文对Ramalho-Pinto等法改进后,在正常小鼠建立了T细胞辅助活力测定方法,并用此观察小鼠感染日本血吸虫和以日本血吸虫抗原免疫后,对半抗原-载体免疫应答的影响。结果表明:①小鼠感染日本血吸虫后早期存在对童虫的辅助T细胞应答;3周后应答水平渐降,反映小鼠感染后,辅助T细胞功能部分地受到抑制;②小鼠用日本血吸虫卵可溶性抗原(SEA)免疫后,T细胞辅助应答的规律和日本血吸虫感染小鼠者相似,但其应答水平比感染小鼠者低。用新鲜虫卵、冰冻干燥虫卵、成虫抗原免疫小鼠,亦能诱导出对童虫的辅助T细胞应答,初步表明来自日本血吸虫生活史不同发育阶段的抗原物质(如虫卵、成虫)和血吸虫童虫表面可能含有共同的抗原决定簇成份。     

分泌抗急性非淋巴细胞白血病M2型单克隆抗体细胞株的建立及其特异性

应用细胞杂交瘤技术建立了分泌抗急性非淋巴细胞白血病M_2型单克隆抗体1D_1、1C_2和1D_6细胞株,连续传代11个月,稳定地分泌单克隆抗体。用间接免疫荧光方法检测,这3株细胞分泌的单克隆抗体与急性非淋巴细胞白血病M_2型病人白血病细胞呈阳性反应;与M_1、M_3、M_4、M_5型病人白血病细胞呈阴性反应;与慢性粒细胞白血病、慢粒急变、急性淋巴细胞白血病及正常人白细胞也呈阴性反应,说明单克隆抗体有很好的特异性。     

大肠癌糖脂抗原的研究

用HT-29大肠癌细胞为抗原,产生单克隆抗体CC-1和CC-2,应用ELISA对8株大肠癌细胞进行检测,全为阳性反应。应用间接免疫荧光法对大肠癌组织的检查结果:CC-1的阳性率为45％,而CC-2为60％,正常大肠上皮阴性反应;但应用PAP法CC-1的阳性率为     

抗人IgG单克隆抗体的研究——Ⅰ.分泌抗人IgG单克隆抗体杂交瘤细胞株的建立

本文报道用人IgG免疫BALB/c 小鼠的脾细胞与骨髓瘤细胞系SP2/O融合,获得 3株分泌抗人 IgG单克隆抗体的杂交瘤细胞株,命名为 SIBPH1、SIBPH2和 SIBPH3。现重点报道SIBPH1株。用琼脂双扩散和免疫电泳等方法,证实该株杂交瘤细胞所分泌的单克隆抗体,对IgG具有良好的专一性,注入同系小鼠腹腔可诱生含较高效价抗IgG的腹水(双扩散1:256～512),单克隆抗体属小鼠IgG_1亚类,该杂交瘤细胞株经组织培养传代逾半年,冻存12个月,复苏良好,分泌抗IgG性能稳定。本文还对杂交瘤细胞建株的若干问题进行了讨论。     

抗血吸虫、肺吸虫、华支睾吸虫共同抗原决定簇的单克隆抗体

<正> 用日本血吸虫可溶性虫卵抗原(SEA)免疫BALB/c 小鼠,取其脾细胞与 SP2/0骨髓瘤细胞按 Kennett 方法作细胞融合,用有限稀释法克隆化2～3次后,建立一株分泌特异性抗体的杂交瘤细胞(A6-B6),其培养上清经浓缩后作免疫球蛋白亚类签定为 IgM,杂交瘤诱生的小鼠腹水经 SEA 免疫     

抗hCG-β单克隆抗体的产生及初步鉴定

本文报道用hCG免疫的BALB/c小鼠脾细胞,与小鼠骨髓瘤细胞NS-1融合,获得6株分泌抗hCG单克隆抗体的杂交瘤细胞。其中,2B5和2D8二株细胞的分泌抗体,对hCG-β亚基呈强阳性反应。其培养液抗体的ELISA效价为10~(-2)～10~(-4);注入同系小鼠腹腔诱生的腹水抗体效价达10~(-5)～10~(-7)。2B5抗体为IgA,2D8抗体属IgG_1。它们对hCG-β的亲和常数(K_a)分别为0.8×10~9升/克分子和1.8×10~9升/克分子.在以~(125)I-hCG-β作为标记物的检测系统中,2B5抗体在50％抑制时同hLH的交叉反应为5.7％,而2D8抗体为3.1％.     

登革病毒非结构蛋白NS1群特异性单克隆抗体的制备及初步应用

目的制备登革病毒NS1群特异性单克隆抗体,建立可检测登革病毒1～4型NS1抗原的ELISA检测法,为登革热的早期快速诊断奠定基础。方法应用毕赤酵母表达系统分泌表达登革病毒2型重组非结构蛋白NS1,以此为抗原免疫BABL/c小鼠,取其脾细胞与小鼠骨髓瘤细胞融合,经HAT选择培养、间接ELISA筛选和亚克隆,获得能稳定分泌登革病毒NS1群特异性单克隆抗体的杂交瘤细胞株;用所获得的单克隆抗体建立可检测1～4型登革病毒NS1抗原的双抗体夹心ELISA法。结果从登革病毒2型NS1重组毕赤酵母（Pichia Pastoris-NS1）中获得了大量纯化的登革病毒重组NS1蛋白;经免疫小鼠、细胞融合、间接ELISA筛选及3次亚克隆后,最终获得2株能高效分泌抗登革病毒NS1单克隆抗体的杂交瘤细胞株2D7B6B4和2D10E2F6,间接ELISA显示抗体效价高达1∶8000～1∶16000;ELISA及免疫荧光检测证实,其所分泌的抗体与1～4型登革病毒及其重组NS1蛋白均有特异性免疫反应,为登革病毒NS1群特异性单克隆抗体;两株单克隆抗体均为IgG2a亚类;初步建立了检测4个血清型登革病毒NS1抗原的双抗体夹心ELISA法。结论成功研制出两株能高效分泌抗登革病毒NS1群特异性单克隆抗体的杂交瘤细胞株。初步建立了可检测1～4型登革病毒NS1抗原的双抗体夹心ELISA检测法。     

用噬菌体多肽库筛选日本血吸虫表膜抗原的模拟表位

为探索可用于诊断的模拟表膜抗原。采用纯化的兔抗表膜抗原IgG作探针 ,免疫筛选噬菌体随机十二肽库 ,经 3轮生物淘洗后 ,随机挑选 30个噬菌体克隆 ,用ELISA检测其与筛选抗体的特异性结合 ,选择两个阳性克隆进行DNA序列测定 ,并用斑点ELISA比较检测正常人和日本血吸虫病患者血清各 10份。结果显示 ,随机挑选的 30个克隆中有 9个噬菌体克隆与筛选的抗体有特异性的结合反应。DNA测序结果显示 ,两个阳性噬菌体克隆 (携带的抗原表位 )所演绎的氨基酸序列与GenBank已知的氨基酸序列无同源性。斑点ELISA结果显示两个抗原表位可被血吸虫病患者血清呈特异性识别     

单克隆抗体斑点试验检测血吸虫卵抗原

靶抗原为血吸虫卵糖蛋白的单克隆抗体SM21-3标记过氧化物酶后,用于直接法斑点试验检测血清中虫卵抗原。12份感染兔血清全部呈阳性反应;12份正常兔血清呈阴性反应。8份感染 10 0条及8份感染10条尾蚴的治疗前兔血清呈阳性反应;治疗后1月,血清抗原水平有不同程度下降;治疗后3月,部分血清转为阴性,其余几份均呈弱阳性反应。检测血吸虫病人血清80份,阳性66份,阳性率为82.5％;检测正常人血清60份,未见阳性反应。上述结果表明本方法具有较好的敏感性与特异性,而且方法简单易行,肉眼观察结果,适于现场应用。     

抗人PD-L1 单克隆抗体的制备及其应用

目的:获得能应用于临床诊断以及阻断PD-L1 与PD-1 结合的抗人PD-L1 单克隆抗体。方法:采用重组表达的人PD-L1 蛋白免疫BALB/ c 小鼠,通过杂交瘤细胞融合技术获得稳定分泌抗人PD-L1 单抗的阳性细胞株,ELISA 方法鉴定抗体的特异性、亲和力、亚型等方面特性;免疫印迹、间接免疫荧光方法对肿瘤细胞进行检测;肿瘤杀伤实验验证抗体阻断活性。结果:共获得2 株抗人PD-L1 单抗,抗体效价分别为1 2.56 106 和1 3 105 ,亲和力分别为1.5 109 L/ mol 和2.5 108 L/ mol,均与PD-L2 蛋白无交叉反应。免疫印迹、间接免疫荧光证实抗体有诊断作用。杀伤实验显示抗体有阻断作用。结论:共获得两株稳定分泌高效价、高特异性的抗人PD-L1 单抗的杂交瘤细胞株,能作为诊断抗体应用于肿瘤表型检测和预后有效性的评估。抗体的阻断功能可应用于联合CIK 细胞免疫治疗。     

Human hybridoma generation by hypo-osmolar electrofusion: characterization of human monoclonal antibodies to Schistosoma mansoni parasite antigens.

Human monoclonal antibodies which bind Schistosoma mansoni worm and egg antigens were identified and characterized from hybridomas generated using the hypo-osmolar electrofusion technique of somatic cell fusion. Splenocytes from S. mansoni infected individuals were mitogen-activated in vitro and subsequently fused by electrofusion. The greatest number of HAT resistant hybridomas per helical fusion chamber was obtained with unfrozen splenocytes cultured for 4-6 days after introduction of mitogen. Hybridomas secreting IgG antibodies recognizing parasite antigens were identified by ELISA. Twenty-one cloned cell lines secreting IgG antibody were maintained for at least 6 months. Characterization of antigen reactivity by Western blot analysis of nien cloned cell lines revealed antibodies which bound stage specific parasitic antigens. The data show that the technique of hypo-osmolar electrofusion produces stable, antibody producing hybridomas. The human monoclonal antibodies screened represent candidate molecules useful in the investigations of the human pathogen S. mansoni.     

Production of monoclonal antibodies using an electrophoretically separated diagnostic marker from the urine of individuals infected with Schistosoma japonicum

In this paper, electrophoresis was successfully used to screen a diagnostic marker (a glycoprotein of 30 kDa) from the urine of individuals infected with Schistosoma japonicum, and then with the marker as antigen, two lines of monoclonal antibodies (mAbs) were obtained, NP56 and NP54. NP56 was of better immunoreactivity, its immunoglobulin isotype being IgG2b. NP56 reacted with soluble egg antigen and adult worm antigen and miracidia in eggs of S. japonicum. Using NP56 as a probe in indirect ELISA, the sensitivity and specificity (median egg excretion per gram of feces 69) was 90% and 100% in concentrated urine samples and 50% and 100% in original urine samples, respectively. The results indicate that the method is feasible for producing mAbs with diagnostic markers separated electrophoretically from the urine of individuals infected with pathogen.     

Immunodominant B-cell epitope in the Mce1A mammalian cell entry protein of Mycobacterium tuberculosis cross-reacting with glutathione S-transferase

The TB1-5 76C monoclonal antibody raised against a synthetic 60-mer peptide in the N-terminal part of the Mce1A mammalian cell entry protein of Mycobacterium tuberculosis has previously been shown to react with a linear epitope in the KRRITPKD region, residues 131-138 in Mce1A, and to cross-react with Mce1F. Six additional monoclonal antibodies raised against the same peptide were also shown to cross-react with Mce1F. Four of them reacted with a linear epitope in the same area, indicating that this area is immunodominant but showed distinct differrences in fine specificity. Two monoclonal antibodies did not react with synthetic peptides from this region on the solid phase in enzyme-linked immunosorbent assay, indicating greater influence of conformation on reactivity. None of the monoclonal antibodies reacted with 14-mer synthetic peptides from the corresponding area in Mce2A, Mce3A, Mce4A, M. avium, M. smegmatis or M. leprae. The reaction pattern of the monoclonal antibodies was analysed in relation to our model of the Mce1A molecule (AK Das et al. Biochem Biophys Res Commun 2003;302:442-7).The epitope is located on the surface of Mce1A, at the distal beta-strand-loop region in the beta-domain supporting its potential role in promoting uptake of M. tuberculosis in host cells. Monoclonal antibody TB1-5 19C cross-reacted with glutathione S-transferase of Schistosoma japonicum containing a PKE triplet. Monoclonal antibody TB1-5 76C gave a major band at about 44 kDa in Western blotting of M. tuberculosis sonicate, whereas polyclonal rabbit anti-Mce1A peptide antibodies reacting with the extended TTPKNPTKRRITPKDVI area of Mce1A showed a distinct band above the 160 kDa molecular mass standard.     

抗SARS病毒N蛋白单克隆抗体的制备和初步应用

目的 制备抗SARS病毒N蛋白的单克隆抗体并研究其初步应用。方法 用基因重组N蛋白免疫小鼠，取免疫后的鼠脾细胞与骨髓瘤细胞融合，筛选分泌抗SAPS病毒N蛋白单克隆抗体细胞株。将阳性细胞株接种小鼠腹腔制备单克隆抗体腹水并对抗体进行纯化，分析纯化抗体的相对亲和力。选择亲和力较高的抗体制备检测SARS病毒抗原的酶联免疫诊断试剂，并对其敏感性和特异性进行分析。结果 共获得11株单克隆抗体细胞株，其中3株单抗与N蛋白具有较高的亲和力，4株纯化单抗与N蛋白反应很弱，其余4株单抗介于两者之间。用亲和力较高的单抗制备检测SARS病毒抗原的诊断试剂，其敏感性可达31PFU／ml，而且与其他呼吸道病毒无交叉反应。结论 该试剂特异性较好，可用于SARS病毒抗原的检测，其敏感性仍需用临床急性期样品进行评价。     

HLA-DQ-controlled T cell response to soluble egg antigen of Schistosoma japonicum in humans.

We analysed regulatory mechanisms of the human T cell response to soluble egg antigen (SEA) of Schistosoma japonicum in vitro. SEA is a crude antigen mixture containing numerous epitopes. We obtained SEA-induced T cell lines from five patients with chronic schistosomiasis japonica, and tested their proliferative response to molecular weight fractions of SEA. Although all T cell lines showed strong responses to crude SEA, there was a heterogeneity in fraction-driven responsiveness. All but one T cell line tested failed to respond to SEA fraction I (mol. wt greater than 18 kD). One patient who was typed as HLA-DQw1/w4, did not show proliferation of CD4+ T cells to fraction I; however, a fraction I-driven helper T cell response was observed when we added HU-11 monoclonal antibody specific for HLA-DQw1/w4. This indicated that the patient had helper T cells to the fraction even though their response was suppressed. Because HLA-DQ had an effect on functional expression of suppressor T cells, it was suggested that there was epitope-specific regulation of the T cell response to SEA, and HLA-DQ-controlled immune suppression might be involved in the regulatory system in human chronic schistosome infection.     

Production and use of rat monoclonal antibodies to the human myeloid cell nuclear differentiation antigen

A dot immunoblot screening assay was used to identify rat monoclonal antibodies to a human myeloid cell differentiation-specific nuclear antigen (MNDA). The selection was based on the positive reaction of hybridoma cell supernatants with a concentrated nuclear protein extract prepared from late stage human myeloid leukemia cells that express MNDA (HL-60) coincident with a negative reaction with the same extract prepared from a non-expressing more immature human myeloid leukemia cell line. The approach provided an efficient method for obtaining monoclonal antibodies to a specific low abundance nuclear antigen that has not been purified. Sixteen wells from three fusions contained antibody displaying a specific reaction with the nuclear protein fraction obtained from the HL-60 cells. Immunoblotting analysis revealed that all of the sixteen specific hybridoma cell lines produced antibody against the same Mr 55,000 nuclear antigen. Selecting hybridoma cells that produce antibody reactive with the native antigen provided antibody suitable for detecting MNDA in immunocytochemical tests. The rat monoclonal antibodies were purified and coupled to CNBr-activated agarose and carbonyldiimidazole-activated agarose. Although both antibody affinity matrices exhibited the same antigen binding capacities, the matrix prepared using carbonyldiimidazole-activated agarose bound the MNDA with a high level of specificity while the matrix prepared from CNBr-activated agarose bound numerous other nuclear proteins.     

Poly(Glu60,Ala30,Tyr10) (GAT)-specific T cells do not express B cell public idiotopes but can be primed by monoclonal anti-idiotypic antibodies

Eight monoclonal anti-idiotypic antibodies directed against public idiotopes have been further characterized: (a) they bind to public idiotopes with a high affinity; (b) they recognize all anti-poly(Glu60,Ala30,Tyr10) (GAT) antibodies as measured by inhibition of the anti-GAT plaque-forming cell response. This has been verified in three strains of mice. These reagents were not able to detect idiotope expression on eight GAT-specific helper T cell lines and clones. This result was obtained by two techniques: (a) idiotope expression at the T cell surface was measured by indirect immunofluorescence using a cell sorter with surface antigens H-2D, Thy-1.2, Lyt-1 and L3T4 as positive controls; (b) after immunoadsorption of [35S] methionine-labeled cellular extracts from two lines, no unique molecule was retained by the HP-idp22 monoclonal anti-idiotypic antibody coupled to Sepharose. Despite these negative results, this antibody was found to prime lymph node cells in vivo, which were able to proliferate specifically in response to GAT. Two T cell lines derived from this lymphocyte population do not express any of the idiotopes tested. These results suggest that monoclonal anti-idiotypic antibodies may be influencing T lymphocyte activity indirectly.