Cysteinyl leukotriene receptor antagonist regulates vascular permeability by reducing vascular endothelial growth factor expression

BACKGROUND: Inflammation of the asthmatic airway is usually accompanied by increased vascular permeability and plasma exudation. Cysteinyl leukotrienes (cysLTs) potently elicit increased vascular permeability in airways, leading to airway edema. Vascular endothelial growth factor (VEGF) is 1 of the most potent proangiogenic cytokines and also increases vascular permeability so that plasma proteins can leak into the extravascular space. However, the mechanisms by which cysLTs induce increased vascular permeability are not clearly understood. OBJECTIVE: An aim of the current study was to determine the role of the cysLTs, more specifically in the increase of vascular permeability. METHODS: We used a BALB/c mouse model of allergic asthma to examine effects of cysLT receptor antagonists on bronchial inflammation and airway hyperresponsiveness, more specifically on the increase of vascular permeability. RESULTS: These mice develop the following typical pathophysiological features of asthma in the lungs: increased numbers of inflammatory cells of the airways, airway hyperresponsiveness, increased vascular permeability, and increased levels of VEGF. Administration of cysLT receptor antagonists markedly reduced plasma extravasation and VEGF levels in allergen-induced asthmatic lungs. CONCLUSION: These results indicate that cysLT receptor antagonists modulate vascular permeability by reducing VEGF expression and suggest that cysLT receptor may regulate the VEGF expression.     

数字化大鼠动脉血管系统三维模型的建立

采用含造影剂及显色剂的填充剂对成年SD大鼠动脉血管系统进行灌注,并借助数字X射线成像设备对灌注效果进行实时监测,通过断层解剖成像系统获取切削间距为100 μm的二维断面解剖数据集(图像分辨率为4917×3446×24 bit,共1 464张),最后利用Visual C 结合可视化工具包编程实现数据集的动脉分割及三维可视化,得到数字化SD大鼠动脉血管系统的三维模型.该模型能提供大鼠动脉血管系统的空间结构信息,为实验大鼠血管系统的研究提供了更为准确可靠的形态学参考.     

一种股骨头假体个性化设计方法研究

为解决人工髋关节置换手术后假体无菌松动等并发症,适应假体个性化快速设计和制造的需求,对假体设计方法进行研究.采用医用CT技术、计算机辅助设计和有限元计算分析相结合的方法,依据患者股骨髓腔解剖形状和置换要求设计髋关节假体;用有限元软件ANSYS建立股骨的三维有限元模型,并自主开发计算机程序计算得到股骨的材料参数,在股骨有限元模型中实现股骨材料的非均匀及各向异性描述;用计算机仿真植入了定制髋假体的股骨--假体系统后的接触问题;分析对比股骨在术前术后的应力、应变大小及分布,检验假体设计的合理性;定量地确定股骨在手术后所产生的应力遮挡效应的程度,研究结果表明这种假体设计和分析方法更为合理、可靠,为优化设计假体和评估假体植入后的长期稳定性提供了基本方法.     

Hepatitis B virus preS1-derived lipopeptide functionalized liposomes for targeting of hepatic cells

To enhance the liver-specific delivery, HBVpreS/2-48^myr (HBVP), a synthetic HBVpreS-derived lipopeptide endowed with compelling liver tropism, was conjugated to PEGylated liposomes (HBVP-Lip) for hepatic cell-specific delivery. Compared with the non-targeted liposomes, a significantly higher amount of HBVP-Lip were taken up by the primary mice hepatocytes through a receptor-mediated endocytosis mechanism. The endocytosis inhibition assay demonstrated that the endocytosis of HBVP-Lip was mediated mainly by caveolin and clathrin. After systemic administration in mice, HBVP-Lip could be specifically internalized into hepatocytes efficaciously. Furthermore, the hepatoprotective effects of HBVP-Lip loaded with silybin (SLB) on carbon tetrachloride induced acute liver damage were remarkably stronger than the SLB solution and SLB loaded non-targeted liposomes. Preliminary safety results suggested that no acute systemic toxicity or immunotoxicity was observed after intravenous administration with HBVP-Lip. These results indicated that the HBVP-Lip could deliver the payloads to the hepatocytes with high specificity in vitro and in vivo, and raise new possibilities for liver-specific drug delivery systems, gene delivery systems, and bio-imaging systems.     

医院感染监控系统的设计与实践

针对院内感染监测管理面临的问题,开发了一套医院感染管理监控系统软件.该系统嵌入医院HIS系统中,实现了全院范围内医院感染的前瞻性监测及环节质量控制,可及时监控耐药菌在院内的传播和流行以及抗菌药物合理应用的分线管理和围手术期用药的疗程控制.文章还对软件功能和应用效果进行了探讨,并对软件功能的进一步研发进行了展望.     

基于问题的学习共同体——大学英语教师自主发展的新视角

PBL(problem-based learning)一直是用于培养学生解决真实问题能力的学习方法或教学方法。本文在综述了与此相关的主要学习理论以及大学外语教师教育发展的一般进程后,指出一旦教师回归到学习者身份,PBL及基于问题的学习共同体就无疑可以成为适合高动机驱动的成年学习者实现自主学习、自我专业发展的有效方法。文章的新视角正在于把语言教师作为普通的学习者来研究,并探索语言教师如何在基于问题的学习共同体中,通过改进自主学习方法来实现自我专业的发展。     

Modeling the emergence of universality in color naming patterns

The empirical evidence that human color categorization exhibits some universal patterns beyond superficial discrepancies across different cultures is a major breakthrough in cognitive science. As observed in the World Color Survey (WCS), indeed, any two groups of individuals develop quite different categorization patterns, but some universal properties can be identified by a statistical analysis over a large number of populations. Here, we reproduce the WCS in a numerical model in which different populations develop independently their own categorization systems by playing elementary language games. We find that a simple perceptual constraint shared by all humans, namely the human Just Noticeable Difference (JND), is sufficient to trigger the emergence of universal patterns that unconstrained cultural interaction fails to produce. We test the results of our experiment against real data by performing the same statistical analysis proposed to quantify the universal tendencies shown in the WCS [Kay P & Regier T. (2003) Proc. Natl. Acad. Sci. USA 100: 9085-9089], and obtain an excellent quantitative agreement. This work confirms that synthetic modeling has nowadays reached the maturity to contribute significantly to the ongoing debate in cognitive science.     

青年原发性闭角型青光眼的临床特征

目的分析青年原发性闭角型青光眼患者的临床特点及治疗效果。方法回顾性分析2009年6月至2019年6月山西省眼科医院17~40岁青年原发性闭角型青光眼51例(61眼)的病历资料,随访时间为6个月至2年。结果本研究中男15例(29.41%),女36例(70.59%),男女比例为1∶2.4。包括急性闭角型青光眼21眼(34.43%),慢性闭角型青光眼40眼(65.57%)。急性闭角型青光眼患者术后的视力较慢性闭角性青光眼提高且眼压控制明显。虹膜囊肿和瞳孔阻滞在急性闭角型青光眼中发生率高。晶状体厚度及眼轴长度在急性闭角型青光眼患与慢性闭角型青光眼差异无统计学意义,但前房深度慢性闭角型青光眼患者较浅。46眼(75.41%)行小梁切除术,14眼(22.95%)行抗青光眼联合白内障手术,1眼(1.64%)未行手术。术后并发症有前房积血、低眼压、脉络膜脱离、浅前房及睫状环阻塞性青光眼,多发生在慢性闭角型青光眼术后。结论青年闭角型青光眼因解剖因素在治疗时有其特殊性,急性闭角型青光眼常伴有虹膜囊肿,晶状体比较厚,而慢性闭角型青光眼常因为眼轴短,发病隐匿,术后容易引起并发症,尤其是睫状环阻塞性青光眼,治疗效果较差。     

口服番泻叶致变态反应1例

番泻叶是一种常见的导泻药,在医院中常把它作为肠道检查前的清肠剂,或用来为部分急性便秘病人解除便秘之苦,具有用法简单、效果可靠、病人依从性好等优点.2008年9月我科1例病人口服番泻叶后出现变态反应.现报告如下.