胃癌单克隆抗体PC6的研究

McAb PC6与2/4胃癌细胞系及14/25胃癌组织呈阳性反应,与肺癌及卵巢癌细胞系有交叉反应,但与其他经检测的正常及肿瘤细胞、胚胎组织、人体正常组织均无反应,表明该抗体有较好的选择性。McAb PC6的对应抗原主要定位于靶细胞的膜上,该抗原可能为—耐热、对胰蛋白酶有抵抗的糖蛋白或蛋白多糖。     

Characterization of monoclonal antibody CL58 against carcinoembryonic antigen (CEA) and study of its biodistribution

Carcinoembryonic antigen (CEA), which was discovered by Gold and Freedom[1] in 1965, is a highly glycosylated membrane bound protein with a molecular weight of approximately 180kD. CEA is expressed at greatly increased levels in nearly all human colorectal carcinomas, as well as many other malignancies of epithelial origin such as breast, lung and ovarian carcinomas[2-4]. Antibodies are highly specific recognition molecules and the development of McAbs has revolutionized the medical appli…     

手握式r探测仪（Oncoprobe）在胃癌放射免疫探测研究中的初试

采用手握式ｒ探测仪（ＯｎｃｏｐｒｏｂｅⅡ（ＴＭ））及（１３１）Ｉ标记的小鼠抗人胃癌单克隆抗体３Ｈ（１１）进行放射免疫探测的体外模型实验和胃癌病人放射免疫导向手术的临床试验。体外模型实验显示，ＯｎｃｏｐｒｏｂｅⅡ（ＴＭ）探测（１３１）Ｉ的效率为３．３％，探测灵敏度为３×１０５靶细胞，最小分辨距离为１．８ｃｍ。胃癌病人术中探测判断胃壁肿瘤浸润的灵敏度、特异性及准确率分别为９６．４％、９６．７％及９５．９％。探测判断转移淋巴结的灵敏度、特异性及准确率分别为９９．２％、９７．７％及９８．８％。初步结果表明，Ｏｎｃｏｐｒｏｂｅ探测可有效的检出临床癌灶，指导胃癌根治术的施行，提高胃癌根治术的治愈率及改善患者的生存质量。     

Relationship among CEA expression in tumor,CEA serum level and radioimmunoguided surgery in colorectal cancer

Current chemotherapeutic agents offer <20% of survival benefits, and surgery still plays an important role in treating colorectal cancer[1]. Although more than two-thirds of patients are candidates for curative surgery, local recurrence occurs in as many as 40% after curative resection[2]. Consequently, a diagnostic tool to enable accurate tumor localization is urgently needed to allow precise and complete removal. Radioimmunoguided surgery (RIGS), originally designed by Aitken, et al.[3], i…     

99Tcm/188Re标记抗CEA单抗CL58及其生物分布研究

癌胚抗原 (ＣＥＡ)广泛存在于肠癌和其他恶性肿瘤中。放射性核素标记的抗ＣＥＡ单克隆抗体 (ＭｃＡｂ)放射免疫显像适用于ＣＥＡ阳性肿瘤原发或复发灶的探测以及术后瘢痕与复发灶的鉴别诊断。利用ＭｃＡｂ的特异性定位功能和发射 β射线的核素对肿瘤具有杀伤作用发展起来的肿瘤导向治疗具有潜在临床应用价值。ＣＬ5 8是抗ＣＥＡＭｃＡｂ ,体外免疫组化结果显示其特异性较高。本研究采用直接法制备99Ｔｃｍ 或1 88Ｒｅ ＣＬ5 8,并对其体内分布情况进行了评价 ,现报道如下。材料与方法一、材料1 88Ｗ 1 88Ｒｅ发生器 (上海科兴药业公司 ) ,Ｎ…     

IDENTIFICATION OF DRUG RESISTANT RELATED cDNA IN LUNG ADENOCARCINOMA CELL LINES

The mechanisms of multidrug resistance (MDR) in lung cancer are complicated, and have not yet been elucidated completely. Studies showed that clinical MDR in lung cancer can only be explained partially by known MDR related proteins1-3. Our previous study also supported this conclusion4. Therefore, in order to clarify the development mechanisms of drug resistance in lung cancer it would be helpful to identify new drug resistance genes and explore their structure and function. In this study,…     

杂交瘤细胞培养中支原体的检测与清除

在细胞培养中,支原体污染是常见令人困扰的问题。支原体是一种极小的微生物,直径仅为0.2～2微米,寄生于细胞生长液中,常附着于细胞膜表面,分泌丰富的腺苷磷酸化酶(adenosine phosphoylase)。此酶能将无毒的6-甲基嘌呤脱氧腺苷(6—     

抗原表位定向选择的人源抗TNF-αFab的鉴定

目的对通过抗原表位定向选择技术（ＥＧＳ）所筛选到的２株人源化ＴＮＦ－α抗体Ｆａｂ段进行分析鉴定。方法测定可变区基因的序列,用亲本鼠单抗Ｚ８进行竞争ＥＬＩＳＡ,用Ｌ９２９细胞检测其体外中和ＴＮＦ－α的活性,并用硫氰酸铵洗脱法比较与亲本鼠单抗的亲和力。结果基因测序表明２株抗体ＶＨ相同,属人ＶＨⅠ亚群;Ｖκ分别属人ＶκⅠ、ＶκⅢ亚群;竞争抑制实验表明所获人源抗体片段与亲本鼠源抗体是针对ＴＮＦ－α的同一抗原表位;体外中和实验证明此抗体片段能中和ＴＮＦ－α对Ｌ９２９细胞的毒性;该抗体片段的亲和力略低于原鼠单抗Ｚ８。结论用ＥＧＳ方法获得的人源抗体片段基本保持了原鼠单克隆抗体Ｚ８的特性     

~（131）I─抗胃癌单克隆抗体在胃癌病人体内的药代动力学研究

用碘标记抗胃癌单克隆抗体（（１３１）Ｉ－３Ｈ（１１））对１４例胃癌患者进行放射免疫导向手术中的药代动力学研究。静脉给药组（ＩＶ）（ｎ＝７）和胃镜粘膜下给药组（Ｅｎｄｏ）（ｎ＝７）其动力学模型经微机拟合均为两室模型。Ｔ１／２β分别为２２．６５±１．３８（ＩＶ）和２１．０２±２．１８（Ｅｎｄｏ），统计学差异不显著。两种给药方式消除规律相似，ＩＶ组并不比Ｅｎｄｏ组清除快。     

多聚腺苷酸信号缺陷病毒捕获宿主序列导致细胞转化

目的:通过人工改变逆转录病毒多聚腺苷酸化信号 ,检测病毒转录能否产生病毒-宿主融合转录产物及其是否具有转化细胞的能力,探讨病毒致癌的机制.方法:用分子生物学技术人工定点突变鼠逆转录病毒多聚腺苷酸化信号,使之产生多聚腺苷酸缺陷性病毒;用该病毒转染大鼠REF-1细胞,并用G418筛选抗性细胞.通过Northern blot方法检查通读RNA的表达;通过细胞形态和软琼脂集落形成实验检测细胞的转化.结果:多聚腺苷酸化信号缺陷病毒PS可在CRIP包装细胞形成病毒;用该病毒感染大鼠REF-1细胞,可捕获下游宿主细胞序列;多聚腺苷酸化信号缺陷病毒感染的REF-1混合细胞中的部分细胞可使REF-1细胞集聚能力增强,在软琼脂中以集落式生长.结论:多聚腺苷酸信号缺陷病毒感染REF-1细胞后可通过表达病毒-宿主通读RNA激活下游宿主序列使细胞发生转化,这可能是病毒致癌的重要机制.