Induction of IL-10 producing CD4+ T cells with regulatory activities by stimulation with IL-10 gene-modified bone marrow derived dendritic cells

Dendritic cells (DCs) can induce both tolergenic as well as effective immune responses in the lung. Pulmonary DCs producing interleukin (IL)-10 mediated tolerance induced by respiratory exposure to antigen. IL-10 is an important immunosuppressive cytokine, which inhibits maturation and function of DC. To assess whether IL-10 producing DCs can exert the tolergenic effect through the differentiation of regulatory T cells, bone marrow derived DCs were genetically modified by IL-10 expressing adenovirus. IL-10 gene modified DCs (Ad-IL-10-DC) displayed a characteristic phenotype of immature DCs. Here we showed that in vitro repetitive stimulation of naïve DO11·10 CD4⁺ T cells with Ad-IL-10-DCs resulted in a development of IL-10 producing T-cell regulatory cells. These T cells could not proliferate well but also lost their ability to produce interferon-γ upon restimulation with irradiated splenocytes and ovalbumin peptide. Furthermore, in co-culture experiments these T cells inhibited the antigen-driven proliferation of naïve CD4+ T cells in a dose-dependent manner. Our findings demonstrated that IL-10 producing DCs had the potential to induce the differentiation of Tr1-like cells and suggested their therapeutic use.     

Antitumor effects of a monoclonal antibody that binds anionic phospholipids on the surface of tumor blood vessels in mice.

PURPOSE: We recently reported that anionic phospholipids, principally phosphatidylserine, become exposed on the external surface of viable vascular endothelial cells in tumors, possibly in response to oxidative stresses present in the tumor microenvironment. In the present study, we tested the hypothesis that a monoclonal antibody directed against anionic phospholipids might exert antitumor effects by causing vascular damage in tumors. EXPERIMENTAL DESIGN: A new mouse immunoglobulin G3 monoclonal antibody, 3G4, was raised that binds anionic phospholipids in the presence of serum or beta2-glycoprotein I. The antibody was tested for its ability to localize to tumor vessels and exert antitumor effects in mice. RESULTS: 3G4 recognized anionic phospholipids on the external membrane of H(2)O(2)-treated endothelial cells and in vitro. It localized specifically to tumor vascular endothelium and to necrotic tumor cells after injection into severe combined immunodeficient mice bearing orthotopic MDA-MB-435 tumors. Treatment with 3G4 retarded the growth of four different tumors in mice. It reduced the growth of established orthotopic MDA-MB-231 and MDA-MB-435 human breast tumors in mice by 75% and 65% respectively, large L540 human Hodgkin's tumors by 50%, and small syngeneic Meth A fibrosarcomas by 90%. Histologic examination revealed vascular damage, a reduction in vascular density, and a reduction in tumor plasma volume. Treatment with 3G4 induced the binding of monocytes to tumor endothelium and infiltration of macrophages into MDA-MB-435 and MDA-MB-231 tumors. No toxicity to the mice was observed. CONCLUSIONS: 3G4 localizes specifically to complexes of anionic phospholipids and serum proteins on the surface of vascular endothelial cells in tumors in mice. This results in damage to tumor vasculature and suppression of tumor growth.     

基于.Net的实验室仪器设备管理系统三层架构设计与实现

结合海南医学院实际,介绍了学校实验室仪器设备管理系统的总体架构设计、系统功能设计及技术实现。测试运行显示,该系统方便了各类用户对实验室仪器设备的查询、管理与维护。     

Low employment and low willingness of being reemployed in Chinese working-age maintained hemodialysis patients

Aim: Returning to society plays an important role in improving the quality of life in maintenance hemodialysis (MHD) patients, and retention of employment is one of the core enablers. The study is to assess the employment status and to determine the variables for unemployment in Chinese MHD patients.

Methods: Prevalent MHD patients from four dialysis centers in Shanghai China were enrolled. We assessed patients’ employment status, current social functioning, hemodialysis modality, annual income and general health condition. Among current unemployed working-age patients, the reasons of quitting jobs and willingness of being reemployed were evaluated.

Results: A total of 231 patients were studied, among which 114 patients were unemployed 1 year before hemodialysis. Among 117 employed patients, 16 patients quitted jobs before dialysis inception, while 49 patients quitted jobs at the initiation of HD, and 26 patients followed after a few months’ HD. The main reasons for ceasing employment were physical insufficiency, conflict between dialysis and work schedules, lack of support from employers and resistance from family members. Among the 166 patients who were in their working age, 26 patients were employed. The unemployed patients had the characters of elder age, lower education level, higher annual family income, higher female ratio, lower blood flow, lower physical functioning, and social functioning and lower frequency of weekend hemodialysis and HDF/HF. Among the 140 unemployed patients, only 47 patients had the willingness of being reemployed. Their unemployment status was positively associated with elder age ((OR) 3.13, 95% CI, 1.08–9.1), lower education level ((OR) 1.97, 95% CI, 1.05–5.92), and higher family income ((OR) 7.75, 95% CI, 2.49–24.14).

Conclusion: Ratio of employment and willingness of being reemployed was low in MHD working-age patients. Lack of social and family’s support also hampered patient’s returning to society except for the HD treatment quality.     

人脑胶质瘤中血管内皮生长因子表达与胶质瘤微血管数及肿瘤增殖活性关系的研究

目的　研究血管内皮生长因子 (VEGF)表达与胶质瘤微血管数、肿瘤增殖活性及其与胶质瘤恶性程度的相关性。方法　应用免疫组化方法检测 5 0例胶质瘤、8例正常脑组织中VEGF、血小板内皮细胞粘附分子 (CD3 1)和增殖细胞核抗原 (PCNA)的表达 ,测定其阳性细胞数和阳性血管数。结果　胶质瘤中均有VEGF、CD3 1及PCNA表达。其表达水平与肿瘤恶性程度呈显著正相关 ,其r分别为 0 .745 ,0 .765及 0 .685。结论　VEGF、CD3 1和PCNA在胶质瘤中的高表达是胶质瘤恶性表型之一 ,可作为病理诊断的补充。     

不同温度处理肌桥修复周围神经效果的比较

用变性骨骼肌桥修复周围神经缺损。为比较不同温度处理骨骼肌桥的优劣，用热变性和冷变性的方法处理大鼠的骨骼肌桥。桥接１～３个月后对大鼠桥接神经作大体观察、神经电生理检测及组织学检查。结果表明，冷变性－１９６℃组在自主运动恢复，再生神经传导速度及再生神经纤维的数量、质量诸方面均明显优于热变性６０℃组和４５℃组。     

用改良的Mayer氏苏木素染色法显示胃颈粘液细胞

PAS和爱先兰染色方法,能显示多种组织的中性和酸性粘液成份,但对含弱酸性的粘液细胞和组织,则染色不佳。本文用改良的Mayer氏苏木素染色方法,对含弱酸性的胃颈粘液细胞染色,获得满意效果,弥补了PAS、爱先兰方法的不足。     

卡那霉素延长给药时鸡基底乳头的损伤与修复

目的　了解卡那霉素延长给药时鸡基底乳头的超微形态变化。方法　将 3天龄罗曼雏鸡连续肌注卡那霉素 (2 0 0mg·kg- 1·d- 1) 10天后随机分组 :①经典施药组 :不再注射药物 ,于药毕后 1、3、7、10、15天时行ABR检测及基底乳头扫描电镜观察。②延长施药组 :继续肌注卡那霉素 ,于连续施药 13、17、2 0、2 5、3 0天时行ABR检测和基底乳头扫描电镜观察。结果　ABR检测结果显示 ,连续施药 2 0天内 ,鸡ABR阈值损失及恢复不受卡那霉素影响 ,与施药 10天即停药者非常相似 ;施药 2 0天后 ,鸡ABR阈值则再次明显升高。扫描电镜观察 :将鸡施与卡那霉素 10天完毕时 ,鸡基底乳头近端 40 %区域毛细胞完全破坏消失 ;其后虽继续施药 ,毛细胞已开始再生修复损伤 ,连续施药 2 0天内基底乳头再生毛细胞无明显受损 ,其形态发育与施药 10天即停药者基本相似 ;连续施药 2 5天时 ,则有部分再生毛细胞出现受损 ,连续施药 3 0天时 ,大部分再生毛细胞破坏消失。结论　鸡卡那霉素耳中毒后 ,卡那霉素的持续存在明显阻止了鸡基底乳头损伤的完全修复     

螺旋CT多平面重建及三维重建在关节损伤中的应用价值

目的：探讨螺旋CT多平面重建(MPR)及三维重建(3D)在关节损伤中的应用价值。方法：选择57例典型关节外伤病人，分析螺旋CT轴位表现及进行MPR和3D后的表现，并将三者进行对照。结果：轴位CT对显示关节骨与软组织由细小病变较好，但对水平面内关节面的改变可能估计不足。MPR和3D有助于弥补轴位CT的不足，较全面评价关节内外的损伤改变，显示多发粉碎性骨折的三维空间关系。结论：螺旋CT轴位图像结合MPR及3D，更加全面、直观地显示关节损伤性改变，对于临床选择治疗方法有重要意义。