分泌IL－5T细胞杂交瘤的培养及IL－5的分离纯化

高浓度ＩＬ－５可以从Ｔ细胞杂交瘤培养的上清液中获得。本文介绍分泌ＩＬ－５的Ｔ细胞杂交瘤的培养及其上清液中分高纯化ＩＬ－５的方法，提纯了高浓度的ＩＬ－５。     

Wu T_(11)(CD2)-小鼠抗人绵羊红细胞受体杂交瘤细胞系的建立

本文报道用T细胞系JMN1免疫BALB/c小鼠,然后取免疫脾细胞与小鼠骨髓瘤细胞系X 63Ag8.653融合。用扁桃腺冰冻切片免疫酶染色法,筛选出一株稳定分泌IgG1亚类的抗绵羊红细胞受体(ER)单扰(McAb)的杂交瘤—WuT11。通过E玫瑰花结形成抑制试验,膜抗原抽提物对WuT11的间接免疫荧光阻断试验,对外周血单个核细胞(PBMC)及其E~ 、E~-层细胞,T、B和非T非B细胞系的反应特征以及FACS的反应曲线等,证明WuT11与OKT11和anti-CCT3相类似,竞争抑制试验证明WuT11与anti-CCT3识别同一表位。用WuT11进行亲和层析,提取的相应抗原经SDS-PAGE,测得分子量为50KDa的糖蛋白,证明WuT11属CD_2,为识别人ER的单抗。     

两株鼠抗人GL50单克隆抗体的制备及其生物学特性的初步研究

目的　研制鼠抗人GL5 0分子单克隆抗体并对其生物学特性进行初步研究。方法　以天然高表达人GL5 0分子的Daudi细胞为免疫原 ,人GL5 0 L92 9转基因细胞为目的单克隆抗体(McAb)的筛选细胞 ,采用B淋巴细胞杂交瘤技术 ,获得分泌特异性鼠抗人GL5 0分子McAb的杂交瘤细胞株 ;免疫荧光标记和流式细胞术分析McAb识别GL5 0的表达 ;Westernblot检测抗体对特异性细胞膜蛋白的识别 ;台盼蓝 (Trypanblue)染色细胞计数法和MTT法检测McAb对Daudi细胞体外生长的抑制作用 ;3 H TdR法检测抗体对GL5 0 L转基因细胞介导的活化T细胞体外增殖的效应。结果　成功制备 2株分泌特异性抗人GL5 0抗体的杂交瘤细胞株 12B11和 11C4 ;两者皆为IgG2a亚型 ;腹水效价皆在 1∶10 0 0以上 ;12B11、11C4特异性地识别GL5 0分子。 11C4McAb可以明显抑制Daudi细胞在体外的生长 ,并可抑制GL5 0 L转基因细胞介导的活化T淋巴细胞的体外增殖效应。结论　成功获得了 2株特异性鼠抗人GL5 0抗体 ,其中 11C4McAb具有诱导表达GL5 0分子的B淋巴瘤细胞Daudi的体外生长抑制作用 ;在T淋巴细胞体外增殖反应中发挥了重要的调节作用。     

鼠抗人OX40功能性单克隆抗体的研制及其生物学特性的鉴定

目的：研制功能性鼠抗人OX40单克隆抗体。方法：以转人OX40的转基因细胞L929-OX40为免疫原，常规免疫6—8周龄的雌性BALB／c小鼠；采用B淋巴细胞融合技术，将免疫小鼠脾脏细胞与SP2／0融合，以L929-OX40转基因细胞及PHA活化的T细胞为抗体筛选阳性细胞，经免疫荧光标记分析对杂交瘤进行反复筛选和多次的克隆化培养；采用快速定性试纸法及竞争抑制结合试验分析了该单抗的亚类及抗原识别位点；采用MTT法分析单抗在体外对T细胞的促增殖效应以及ELISA分析活化T细胞分泌的细胞因子。结果：获得1株持续、稳定分泌鼠抗人OX40单克隆抗体的杂交瘤细胞株(命名为7E11)，该单抗能特异性地识别人OX40分子和介导有效的共刺激信号，体外促进活化的T细胞增殖和细胞因子的分泌。结论：成功研制成一株能分泌功能性鼠抗人OX40单克隆抗体的杂交瘤，该抗体特异性地识别人OX40分子并具有在体外协同刺激T细胞的作用。     

丙型肝炎病毒NS3蛋白单克隆杂交瘤细胞株的建立及初步鉴定

应用国产基因工程表达的丙型肝炎病毒（ＨＣＶ）ＮＳ３区抗原免疫小鼠，然后取其脾细胞与小鼠骨髓瘤细胞系ＳＰ２／０融合，筛选出４株稳定分泌抗ＨＣＶＮＳ３区蛋白单克隆抗体（ＭｃＡｂ）的杂交瘤细胞株，分别命名为２Ｂ６，２Ｆ３，３Ｄ８，３Ｄ９，经初步研究表明这４株单抗与ＮＳ３抗原具有良好的反应性，与ＨＣＶ核心区多肽及乙型肝炎病毒表面抗原和ｅ抗原均无反应。抑制实验表明这４株抗体分别针对ＮＳ３抗原分子上的２个不同的抗原决定簇。     

抗大肠杆菌耐热性肠毒素ST1 McAb杂交瘤细胞系的建立及应用

目的 耐热性肠毒素ST1单克隆抗体制备及在感染性腹泻诊断中的应用。方法 应用基因工程菌株分泌的肠毒素制备ST1包涵体，免疫Balb／c小鼠，成功制备了3株特异性抗ST1的单克隆抗体细胞株，用其中1株McAb建立了检测ST1的双单克隆抗体夹心ELISA法。结果 检测52株从临床腹泻病人粪便中分离的大肠杆菌，检出ST1阳性率为26．92％，与ST1检测的经典方法乳鼠灌胃法符合率为96．15％。结论 该方法是一种简捷、灵敏和特异的检测方法，具有实际应用价值。     

用杂交瘤细胞免疫电泳法检测肺癌患者血清PA_3抗原的初步研究

本文报告一种新的杂交瘤细胞免疫电泳法及其在检测肺癌患者血清PA_3抗原中的应用。本法共检肺癌22例,其他癌30例,正常对照50例。以细胞电泳减慢率≥35％为分界标准,PA_3阳性率分别为肺癌77.27％,其他癌20.0％,正常人6.0％。4例阳性肺癌血清经PA_3杂交瘤细胞培养上清预反应后,其减慢率均受抑制,提示PA_3抗原在肺癌中的表达具有限定性。本文结果表明用杂交瘤细胞免疫电泳法进行PA_3抗原的检测对肺癌的血清学诊断可能具有一定价值。     

孕酮单克隆抗体的制备

本研究获得了三个分泌孕酮单克隆抗体的杂交瘤细胞株。这些高特异性抗体既和游离也和结合孕酮结合。这些抗体可和孕酮-牛血清白蛋白产生沉淀反应,但不沉淀牛血清白蛋白。它们可凝集覆盖有孕酮-牛血清白蛋白的羊红血球。它们的亲合力(Ka)在3～4.5×10~9M~(-1)之间。利用K(?)hlef 和Milstein 开创的杂交瘤技术制备激素单克隆抗体的工作开始不久,但已显示出巨大的潜力。利用这种技术获得大量均匀专一的孕酮抗体不仅有助于孕酮免疫测定的标准化,也将促进对孕酮在生殖过程中的作用的进一步了解。本文报道我们实验室利用杂交瘤技术获得的3个分泌孕酮单克隆抗体的细胞株。     

A Quantitative Nitrocellulose Enzyme Immunoassay and its Application to the Screening of Hybrbidomas for the Detection of Uncharacterized Tumor-Associated Antigens in Sera of Cancer Patients

Abstract

An enzyme-linked immunosorbent assay on nitrocellulose based microtiter plates for the detection of uncharacterized tumor associated antigens in squamous cell carcinoma and adenocarcinoma cancer patients' sera is described. Nitrocellulose microtiter plates are more sensitive than the plastic plates of polystyrene and polyvinyl chloride for the detection of antigens in serum. Monoclonal antibodies were selected for their net reactivities toward cancer patients' sera as compared to nomal sera. Sera from benign liver and kidney disease patients and activated human peripheral blood leukocyte supernatant were used to reduce potential false positives toward inflammatory and benign diseases. Using this system, fourteen antibodies were selected out of over eight hundred antibodies for their potential serodiagnostic application.     

The intraspleen huPBL NOD/SCID model to study the human HIV-specific antibody response selected in the course of natural infection

The intrasplenic injection of human peripheral blood mononuclear cells (PBMCs) into severely immune deficient NOD/SCID mice, causes a massive and transient dominant expansion of human B cells in the spleen. This permits the easy isolation of human monoclonal antibodies specific for different antigens by a Kohler and Milstein-based method. Here we studied the human HIV-specific antibody response in the circulation of mice after intrasplenic transfer of PBMC from untreated HIV-infected patients with detectable to high viral load as well as from HAART-treated and from untreated patients, who kept an undetectable viral load (the latter referred to as “natural suppressors”). Excellent B cell expansion was obtained for all PBMC. High level replication of virus was observed after transfer of PBMC of untreated viremic patients only. A strong and multispecific HIV-specific antibody response was observed after transfer of PBMC of untreated viremic patients and natural suppressors. In contrast, only a weak and pauci-specific antibody response was detected in mice reconstituted with PBMC from successfully treated patients. Based on these observations we conclude that the use of the intraspleen mouse model confirmed a) the presence of HIV-specific circulating memory B cells in untreated patients and natural suppressors; b) the nearly complete absence of circulating memory B cells in patients receiving highly active antiretroviral therapy. Using the intraspleen model we generated large numbers of immortalized B cells and isolated two anti-p24 human monoclonal antibodies. We further conclude that the intraspleen huPBL NOD/SCID model is a small animal model useful for the analysis of the antibody response against HIV found in patients.