EFFECT OF VL AND VH CONSENSUS SEQUENCE-SPECIFIC PRIMERS ON THE BINDING AND EXPRESSION OF A MINI- MOLECULE ANTIBODY DIRECTED TOWARDS HUMAN GASTRIC CANCER

Objective. To construct ScFv and Fab from murine anti-gastric cancer monoclonal antibody(mAb) 3H11.Methods. At first,3H11 ScFv and Fab were constructed with Ⅴ genes PCR amplified by degenerate primers for FR1 .The bacterial expressed 3H11 Ab fragments showed no antigen binding activity.Then,phage antibody library and random mutated library were constructed from 3H11 hybfidoma cells and panning selection was performed. Again the i-dentification of positive clone was failed. Finally the N-terminal sequences of Ⅴ regions were resumed to 3H11 original sequences by site-directed mutagenesis via PCR.Restdts. Binding activity to gastric cancer cells was detected only from N-terminal sequence corrected 3H11 ScFv and Fab, though the expression of the Ab fragments was not affected. Correction of either VL or VH N-terminal se-quences could partially resume the antigen binding activity. Conclusion. Sequence changes of Ⅴ region N terminal introduced by PCR may seriously affect antigen binding without affecting the expression of antibody.     

Disease type-associated increases of the plasma levels and ligand expression for natural alpha- or beta-galactoside-binding immunoglobulin G subfractions in patients with lung cancer

The presence of natural carbohydrate-binding antibodies may play a role in host defence against malignant cells in addition to elicitation of an immune response by artificial carbohydrate antigens. Human serum contains immunoglobulin G(2) (IgG) fractions with selectivity to alpha- and to beta-galactosides, respectively, irrespective of the type of blood group of the donor. To determine whether these naturally occurring subfractions may have any relevance for tumor disease control, their binding to malignant cells was ascertained by cytofluorimetric assays in vitro with a number of human tumor cell lines of different histogenetic origin. The affinity of cell binding was comparable to that of binding to lactosylated or melibiosylated neoglycoconjugates as model ligands in solid-phase assays and K-D values were found to be in the range of 5-300 nM. Cross-reactivity of the anomer-selective subfractions to the other type of ligand was observed to be rather low. When the IgG contents of plasma samples of patients with diverse types of lung cancer were assessed, the concentrations of both galactoside-binding immunoglobulin G subfractions were significantly increased in association with presence of small cell lung carcinoma and of metastatic lesions to the lung without any marked change in the overall IgG plasma level. Such an apparently general enhancement was seen for patients with adenocarcinoma and included both subfractions with no impact on their percentage in the total IEC content. When detergent extracts of tumor and tumor-free specimens of the same patient were analyzed with the affinity purified antibody subfractions to comparatively determine ligand presentation, increases in sugar-inhibitable binding were especially noted for the tumor tissue of small cell lung carcinomas and apparently tumor-free samples of cases with lung metastasis. Material from other types of lung cancer revealed no significant indication for disease-related alterations with the exception of carcinoids. These data demonstrate that plasma levels and ligand expression for two types of natural galactoside-binding immunoglobulin G fractions can show nonuniform responses in patients within the class of lung cancer. They encourage to deliberately monitor these parameters of the natural carbohydrate-directed antibody fractions in cancer patients with various types of disease to clarify the clinical significance of respective malignancy-associated changes.     

Effect of hepatic cirrhosis on the pharmacokinetics of theophylline in rats

The experimental hepatic cirrhosis was induced either by bile duct ligation (BDL) or by pretreatment with dimethylnitrosamine (DMNA). The pharmacokinetics of theophylline were studied after a single intravenous or a single oral administration. Using the ultrafiltration method, protein-drug binding experiments were also carried out. The bilirubin level was several-fold increased by BDL, but not by DMNA treatment. The albumin content was decreased in both cirrhotic groups. The total clearance (Clt, ml/kg/hr) of theophylline in both hepatic cirrhosis groups significantly decreased and the terminal half-life (t_1/2) in the cirrhotic rats was increased about two-fold after intravenous and oral administration. The volume of distribution at steady state (Vdss, ml/kg) was increased slightly in the cirrhotic groups. Protein binding in BDL (8.67±4.85%) decreased about four-folds, but in DMNA (73.00±9.85%) similar result, was observed as compared with the control. Increased free fraction of theophylline did not increase the volume of distribution in BDL. Therefore decreased total body clearance of theophylline was mainly due to decreased intrinsic clearance of theophylline in the liver. The absolute bioavailability of theophylline in these experiments was between 63.8 and 72.8%(66.1% in BDL, 63.8% in Sham operated and Control, 72.8% in DMNA). These results suggest that in the experimental hepatic cirrhosis model, administration route does not affect the disposition of theophylline.     

Current Status of the VU MFEL Compton X-Ray Program

The Vanderbilt University medical FEL (free electron laser) Compton x-ray program is close to being operational. The FEL modifications necessary for this new capability are near completion. The transport and detection systems for electron and IR beams have been designed, delivered, and tested. We initially expect to produce 108 x-ray photons per second in the 15- to 20-keV region.     

上海市50岁及以上人群维生素D水平与握力的关联研究

目的 探讨上海市≥50岁人群维生素D水平与握力的关系。方法 数据来源于WHO全球老龄化与成人健康研究我国上海市2018-2019年数据,采用logistic回归模型分析维生素D水平与握力的关系,进一步按照性别、年龄及乳制品摄入情况进行分层;采用限制性立方样条曲线绘制维生素D水平与低握力的剂量-反应曲线。结果 共4 391人纳入研究,其中男性2 054人（46.8%）;年龄（67.02±8.81）岁;低握力1 421人（32.4%）;维生素D不足及缺乏分别为1 533人（34.9%）和401人（9.1%）。在调整相关混杂因素后,logistic回归分析结果显示,维生素D缺乏的人群发生低握力的风险更高（OR=1.41,95%CI：1.09~1.83）;在男性中,调整相关混杂因素后,维生素D缺乏与低握力发生风险呈显著正相关（OR=1.67,95%CI：1.12~2.50）,而女性中两者之间无关联（OR=1.30,95%CI：0.97~1.74）;在60~69岁及≥80岁年龄组中,调整相关混杂因素后,维生素D缺乏与低握力发生风险呈显著正相关（OR=1.57,95%CI：1.05~2.35;OR=2.40,95%CI：1.08~5.31）,在乳制品摄入<250 ml/d的人群中,调整相关混杂因素后,二者之间呈显著正相关（OR=1.57,95%CI：1.17~2.09）,而在乳制品摄入≥250 ml/d的人群中无明显关联。限制性立方条样图显示,低握力的发生风险可能随维生素D含量的上升而降低,但差异无统计学意义（P>0.05）。结论 维生素D水平与握力存在一定的关系,维生素D缺乏人群出现低握力的风险更高。     

小儿肾小球疾病血清微量元素测定与分析

采用原子吸收分光光度法,测定了７８ 例肾小球疾病患儿血清铜、锌、铁、镁４ 种元素。结果显示,单纯性肾病组、肾炎性肾病组、紫癜性肾病组及肾炎组血清锌均显著低于正常组（ Ｐ＜ ００５）,血清铁、镁与正常组比较无显著差异。单纯性肾病组,肾炎性肾病组血清铜显著低于正常组（ Ｐ＜ ００５）。提示血清铜、锌、铁、镁含量的变化与疾病发生和疾病状态有关。     

网络环境下利用大容量硬盘开展光盘信息服务的方法

一、引言 随着多媒体技术的不断发展,利用光盘发行数据的数据库制造商越来越多,包括声、图、文多媒体的各种数据库大量涌现;新的CD-ROM网络驱动技术也日益完善.正是这些网络化的信息共享技术与新型的电子出版物技术,为现代化的图书情报的高水平服务创造了条件.时至今日,人们利用个人微机,不论通过本地局网,还是通过远程拨号连接网络,均可一人同时检索几个光盘数据库,或几个人同时共享一个光盘数据库.这样方便了人们的使用,扩大了服务的范围,提高了信息的利用率.     

雷公藤多甙对肾性蛋白尿患者外周血单个核细胞作用的研究

通过琼脂糖凝胶电泳, Ｈ Ｅ 染色和流式细胞仪检测用雷公藤多甙治疗肾性蛋白尿患者 ２ 周后外周血单个核细胞的凋亡情况。经治疗后患者外周血单个核细胞在形态上出现典型的细胞核固缩、碎裂,琼脂糖凝胶电泳显现特征性的“梯状”带,流式细胞仪上出现亚二倍体峰。提示雷公藤多甙能诱导肾性蛋白尿患者外周血单个核细胞的凋亡。     

骨肉瘤细胞核因子кB免疫组化研究

细胞核因子ＮＦ－кＢ在肿瘤血管生成中可能具有核心调节作用,本文选择８０例有随访结果的骨肉瘤,应用免疫组化方法检测 ＮＦ－кＢ ｐ６５亚单位以及血管内皮细胞生长因子（ＶＥＧＦ）的表达,同时观察肿瘤内微血管密度（ＭＶＤ）,旨在探讨 ＮＦ－кＢ表达与骨肉瘤血管生成的关系。结果：８０例骨肉瘤中 ４８例 ＮＦ－кＢ ｐ６５阳性,阳性产物主要定位于肿瘤细胞浆。ＮＦ－кＢ表达与ＶＥＧＦ表达和ＭＶＤ呈显著正相关,而且ＮＦ－кＢ阳性组病人存活时间显著低于阴性组。该结果表明：①ＮＦ－кＢ ｐ６５是骨肉瘤相关的一种癌蛋白,在骨肉瘤的发生和发展中发挥重要的作用;②ＮＦ－кＢ对ＶＥＧＦ可能有正向调节作用,进而影响骨肉瘤血管生成;③ＮＦ－кＢ　对肿瘤血管生成的作用,可能是影响骨肉瘤预后的主要原因之一。     

抗A1试剂血清的研制

目的 :ABO亚型在临床输血中经常造成错定血型及输血反应 ,因而研制抗A1试剂血清是解决ABO亚型鉴定的主要途径。方法 :采用血型血清学特异性抗原抗体吸收实验。结果 :经大量反复实验 ,研制出特异性强 ,效价符合要求的抗A1试剂血清。结论 :抗A1血清是鉴定A亚型的专用试剂血清 ,对临床鉴定ABO亚型及安全输血有实用意义。