利用噬菌体表现呈现技术制备HIV—1整合酶单链抗体的初步研究

研制ＨＩＶ－１整合酶的重组噬菌体单链抗体。方法采用噬菌体表现呈现方法。结果：由ＩＮ蛋白免疫的小鼠脾细胞ｍＲＮＡ中构建了单链抗体基因ｃＤＮＡ文库，克隆入噬菌粒载体ｐＣＡＮＴＡＢ５Ｅ，经转化大肠杆菌ＴＧ１，获得了车容为３．５＊１０＾５的表达文库。     

丙型肝炎病毒核心蛋白可溶性单链可变区抗体在大肠杆菌中的表达

利用分子生物学技术,构建表达丙型肝炎病毒（ＨＣＶ）核心蛋白的人源单链可变区抗体（ＳｃＦｖ）的原核表达载体,并在大肠杆菌ＪＭ１０９中表达可溶性的ＨＣＶ－ｃｏｒｅ－ＳｃＦｖ。以重组的ＨＣＶ核心蛋白为包被抗原,利用噬菌体抗体库的表面展示技术,筛选到含有ＨＣＶ－ｃｏｒｅ－ＳｃＦｖ基因的噬菌体克隆。从噬菌体抗体阳性克隆中提取质粒,经ＮｃｏⅠ／Ｎｏｔ Ⅰ酶切鉴定,该ＳｃＦｖ基因由７５０ｂｐ组成。将其亚克隆到ｐＣＡＮＴＡＢ５Ｅ表达载体中,转化大肠杆菌ＪＭ１０９,提取质粒进行ＤＮＡ序列测定,符合ＳｃＦｖ的重链可变区和轻链可变区基因结构特点。ＩＰＴＧ诱导转化的大肠杆菌ＪＭ１０９,在其培养上清中获得了可溶性ＨＣＶ－ｃｏｒｅ－ＳｃＦｖ的表达。酶联免疫吸附法（ＥＬＩＳＡ）证实表达的ＨＣＶ－ｃｏｒｅ－ＳｃＦｖ进行聚丙烯酰胺凝胶电泳（ＰＡ     

人源宋内痢疾杆菌脂多糖抗独特型抗体的筛选和基因结构特点分析

将纯化的宋内痢疾杆菌脂多糖的鼠单克隆抗体（５Ｂ１２）固相化，然后对混合噬菌体抗体库（ＨＩＶ、ＨＡＶ、ＨＢＶ）进行５轮“吸附－洗脱－扩增”的淘筛，使特异性噬菌体抗体得到了富集，阳性率达５３．１３％。竞争抑制试验证明，其中６株与宋内痢疾杆菌脂多糖的竞争抑制率大于５０％。酶切电泳图谱显示，淘筛的阳性克隆均无轻链基因，重链基因约４００ｂｐ。对分离的两株阳性克隆进行序列分析研究，发现这两个克隆ＤＮＡ序列相同，均为人免疫球蛋白重链可变区序列，属人ＩｇＧ基因Ⅲ家族，长度为３８４ｂｐ，与期望的６６０ｂｐ相差２７６ｂｐ。但这种重链部分缺失和轻链完全缺失的抗体片段却有明确的与５Ｂ１２的结合活性。     

人源抗HIV—1整合酶单链抗体基因的构建及表达

获得人源抗ＨＩＶ－１整合酶单链抗体基因并在大肠杆菌及细胞中进行表达。方法：从人的抗ＨＩＶ－１整合酶的Ｆａｂ抗体基因片段中通过ＰＣＲ扩出此抗体的重链可变区和轻链可变区基因,经一弹性连接肽连接构建成人源抗ＨＩＶ－１整合酶的单链抗体基因。     

分泌抗HIVp24单克隆抗体杂交瘤细胞系的建立及其初步鉴定

以含人免疫缺陷病毒（ＨＩＶ）核心抗朱ｐ２４全部氨基酸序列的重组蛋白ｐＧ１免疫小鼠，用免疫脾细胞与ＳＰ２／０骨髓瘤细胞融合，成功地建立了５株分泌抗ＨＩＶｐ２４单克隆抗体（ＭｃＡｂ）的杂交瘤细胞株。经鉴定，这５株ＭｃＡｂ与乙肝核心抗原（ＨＢｃＡｇ），丙肝Ｃ区，ＮＳ－３区抗原不发生交叉反应，而与重组ｐ２４抗原产生特异反应，本组单抗的研制成功为建立检测ＨＩＶｐ２４抗原的方法奠定了基础。     

FAS抗原胞外区片段GST融合蛋白的产生

目的：获得重组ＦＡＳ抗原，用于抗体制备及进一步的功能分析。方法：用ＰＣＲ技术从完整的ＦＡＳｃＤＮＡ克隆上扩增其编码胞外区的部分，将ＰＣＲ产物直接克隆到ｐＧＥＭ－Ｔ载体系统，ＤＮＡ序列分析证实序列完全正确；用ＥｃｏＲⅠ和ＳａｌⅠ将ＦＡＳ胞外区片段切出，定向克隆到经同样酶切处理的ｐＧＥＸ－ＫＧ表达载体，转化大肠杆菌，经优化ＩＰＴＧ的诱导条件，获得了ＦＡＳ胞外区与谷胱甘肽－Ｓ－转移酶的融合蛋白高效表达；用亲合层析法从细菌粗提物中纯化了ＧＳＴ－ＦＡＳ融合蛋白，免疫家兔制备了抗ＦＡＳ抗体。结果：用重组ＦＡＳ为免疫原制备的抗体能诱导Ｕ９３７细胞产生细胞凋亡。结论：重组ＦＡＳ抗原和制备的抗体能用于对ＦＡＳ系统的功能研究     

人抗HBsAg噬菌体抗体Fab段基因的序列分析及表达

对已建的噬菌体抗体库分离出来的人抗－ＨＢｓ克隆进行了序列分析和表达研究，发现４个克隆中３个克隆的重链和轻链完全相同，ＤＮＡ序列分析表明ＶＨ分别属于ＶＨ１亚群和Ⅱ亚群，其轻链ＶＬ分别属于ＶλⅡ亚群和ＶλⅠ亚群。构建了可溶性Ｆａｂ段表达载体，显示出在细菌中表达的Ｆａｂ段抗体与ＨＢｓＡｇ特异性结合，这说明所筛选出来的噬菌体抗体具有ＨＢdisplay status     

HIV—1多表位膜蛋白在E.coli中的表达及在血清检测中的应用

目的：获得具有较多保守抗原表位的ＨＩＶ－１膜重组抗原，提高ＨＩＶ筛选ＥＬＩＳＡ试剂的质量。方法：利用分子克隆与ＰＣＲ方法，获得了新的ＨＩＶ－１膜重组抗原的基因克隆，编码ｇｐ１２０Ｃ端亲水区３７个氨基酸残基（ｅｎｖ４８２～５１８）以及ｇｐ４１膜外部分的１２８个氨基酸残基（ｅｎｖ５４８～６７５）。将该基因克隆到ｐＧＥＭＥＸ－１载体上融合表达，表达蛋白经纯化后，以１μｇ／ｍｌ的浓度包被ＥＬＩＳＡ板，用来     

丙型肝炎病毒核心蛋白抗独特型人源单链可变区抗体的筛选与鉴定

为制备抗丙型肝炎病毒核心蛋白的抗独特型单链可变区抗体（抗－Id scFv),采用噬菌体表面展示技术，将抗－HCV核心蛋白的单克隆抗体固相包被于Nunc板，从噬菌体单链可变区抗体库中经过5轮“吸附－洗脱－扩增”筛选过程，获得可与HCV核心蛋白单克隆抗体结合的抗独特型人源单链可变区抗体的噬菌体集落。随机挑选60个克隆，利用酶联免疫吸附法（ELISA）、交叉反应和竞争抑制实验，对其进行免疫学检测和鉴定。获得与HCV核心蛋白单克隆抗体结合活性较强的抗－Id scFv阳性克隆，并对HCV核心蛋白特异性抗－Id scFv的编码序列进行测定分析。结果经过5轮“吸附－洗脱－扩增”筛选，在随机挑选的60个克隆中，有20株克隆ELISA的吸光度（A450nm)值较高，这些噬菌体上清与牛血清白蛋白（BSA）进行交叉反应后，确定了其中有6株交叉反应较弱，结合2次ELISA重复实验的A值及竞争抑制实验结果，最后确定1株阳性克隆，提取质粒，进行DNA序列测定，DNA大小为768bp。本实验结果提示用噬菌体抗体库技术能够成功地获得抗－HCV核心蛋白的抗－Id scFv，为开展用抗－Id scFv防治慢性丙型肝炎的研究创造了条件。     

人白细胞介素15基因的分离及其在大肠杆菌中的克隆与表达

目的：分离编码人ｈＩＬ－１５的ｃＤＮＡ并大肠杆菌中克隆与表达，方法：采用ＰＨＡ刺激人外周血白细胞提取ｍＲＮＡ，并利用ＲＴ－ＰＣＲ方法获得ｈＩＬ－１５的ｃＤＮＡ将其定向插入ＰＵＣ１９载体中，ＤＮＡ序列分析表明分离的ｈＩＬ－１５的序列与文献报道一致，以ｐＢＶ２２０为表达载体构建并筛选出重组于ｐＢＶｈＩＬ－１５；重组子转化Ｅ．ｃｏｌｉＤＨ５α菌株，经４２℃诱导表达。结果：相对分子质量为１４０００的ｈＩＬ     

The role of interventional radiology in trauma

Introduction Interventional Radiology has evolved into a specialty having enormous input into the care of the traumatized patient.In all hospitals,regardless of size,the Interventional Radiologist must consider their relationships with the trauma service in order to     

The acutely limping child

Acute limping may be the result of multiple pathologies in children. The differential diagnosis varies based on the age of the child. Irrespective of age, the initial imaging work-up includes AP and frog leg radiographs of the pelvis and ultrasound; MRI may sometimes be helpful. In children less than 3 years, infections and trauma are most frequent. MRI is the imaging modality of choice when osteomyelitis is clinically suspected. Between the ages of 3 and 10 years, transient synovitis of the hip and Legg-Calvé-Perthes disease are main considerations but infection, inflammation and focal bony lesions are also considered. In children over 10 years, slipped capital femoral epiphysis also is considered.     

Do Balance Board Training Programs Reduce the Risk of Ankle Sprains in Athletes?

Introduction Ankle sprains are the most common musculo-skeletal injury that occurs in athletes,particularly in sports that require jumping and landing on one foot such as soccer,and basketball(1-4).These injuries often result in significant time loss from participation,long-term disability,and have a major impact on health care costs and resources(5-8).     

Carbohydrate Supplementation during Exercise: Does It Help? How Much is Too Much?

KEY POINTS· Carbohydrate intake during exercise can delay the onset of fatigue and improve performance of prolonged exercise as well as exercise of shorter duration and greater intensity (e.g., continuous exercise lasting about 1h and intermittent high-intensity exercise), but the mechanisms by which performance is improved are different.     

Diagnóstico ecográfico del neumotórax

The ultrasonographic diagnosis of pneumothorax is based on the analysis of artifacts. It is possible to confirm or rule out pneumothorax by combining the following signs: lung sliding, the A and B lines, and the lung point. One fundamental advantage of lung ultrasonography is its easy access in any critical situation, especially in patients in the intensive care unit. For this reason, chest ultrasonography can be used as an alternative to plain-film X-rays and computed tomography in critical patients and in patients with normal plain films in whom pneumothorax is strongly suspected, as well as to evaluate the extent of the pneumothorax and monitor its evolution.     

High Intensity Interval Training:New Insights

KEY POINTS ·High-intensity interval training(HIT)is characterized by repeated sessions of relatively brief，intermittent exercise.often performed with an“a11 out”effort or at an intensity close to that which elicits peak oxygen uptake(i.e.，≥90%of VO2 peak).     

磁共振DWI和动态增强鉴别颅底脊索瘤和侵袭性垂体瘤的应用

目的 探讨磁共振扩散加权成像(DWI)和动态增强在颅底脊索瘤和侵袭性垂体瘤(IPA)鉴别诊断中的应用价值.方法 搜集经手术病理证实且影像学有鞍区破坏的颅底脊索瘤患者15例、向鼻咽部侵犯的IPA患者20例.测量二者的表观扩散系数(ADC)值,绘制受试者工作特征曲线(ROC),分析动态增强曲线的类型,统计达峰时间(TTP)、增强峰值(EP)和最大对比增强率(MCER),分析各个参数在鉴别诊断中的价值.结果 颅底脊索瘤的ADC值为(1.274±0.07)×10-3mm2/s,高于IPA ADC值(0.672±0.03) ×10-3 mm2/s(P ＜0.001),ADC阈值为0.964×10-3mm2/s时,ROC曲线下面积为0.997,敏感度为93.3％,特异度为100％.颅底脊索瘤时间-信号强度曲线(TIC)Ⅰ型14例,TICⅢ型1例,此例TICⅢ型者TTP约40 s;IPA TIC Ⅰ型7例,TICⅢ型13例.颅底脊索瘤和IPA的EP、MCER差异均有统计学意义(P ＜0.001).结论 ADC值和TIC的类型及其相关参数(EP,MCER)有助于颅底脊索瘤和IPA之间的鉴别.     

Knee injury and Osteoarthritis Outcome Score (KOOS) - validation of a Swedish version

The Knee injury and Osteoarthritis Outcome Score (KOOS) is a self-administered instrument measuring outcome after knee injury at impairment, disability, and handicap level in five subscales. Reliability, validity, and responsiveness of a Swedish version was assessed in 142 patients who underwent arthroscopy because of injury to the menisci, anterior cruciate ligament, or cartilage of the knee. The clinimetric properties were found to be good and comparable to the American version of the KOOS. Comparison to the Short Form-36 and the Lysholm knee scoring scale revealed expected correlations and construct validity. Item by item, symptoms and functional limitations were compared between diagnostic groups. High responsiveness was found three months after arthroscopic partial meniscectomy for all subscales but Activities of Daily Living.