高眼压兔眼房水丛管腔内皮细胞的电镜观察

探讨房水丛管腔内壁内皮细胞及其细胞间连接在高眼压房水流出中的作用。巩膜环扎法造成兔眼高眼压动物模型；透射电镜观察持续不同时间高眼压兔眼房水丛内壁内皮细胞及其细胞间连接的超微结构变化。结果：高眼压３ｄ，１周房水丛内皮细胞南变薄，胞突互相包绕形成假空泡，细胞连接和间隙正常；高眼压３，４周内皮细胞更薄，胞质内大空泡减少，细胞间连接存在，细胞间隙无扩张，假空泡消失。     

Implantation of vascular grafts lined with genetically modified endothelial cells

The possibility of using the vascular endothelial cell as a target for gene replacement therapy was explored. Recombinant retroviruses were used to transduce the lacZ gene into endothelial cells harvested from mongrel dogs. Prosthetic vascular grafts seeded with the genetically modified cells were implanted as carotid interposition grafts into the dogs from which the original cells were harvested. Analysis of the graft 5 weeks after implantation revealed genetically modified endothelial cells lining the luminal surface of the graft. This technology could be used in the treatment of atherosclerosis disease and the design of new drug delivery systems.     

Synovial cell synthesis of a substance immunologically like cartilage proteinpolysaccharide

Fluids from joints contain a substance that reacts immunologically like one of two known antigenic components of articular cartilage proteinpolysaccharide. This newly recognized substance occurs in the lining cells of synovial membranes as shown by indirect immunofluorescence. The localization of this substance in tissue culture cells derived from synovial membranes and its identification in the culture medium supports the suggestion that it is synthesized by lining cells. Rheumatoid synovial cells contain less of this substance.     

大鼠不同部位内皮细胞的体外培养

为了建立一种能有效分离、培养和获取较高纯度的大鼠心肌膜微血管内皮细胞(RMMECs)、肠黏膜微血管内皮细胞(RIMECs)、主动脉内皮细胞(RAECs)、后腔静脉内皮细胞(RPVECs)的模型,自7dSD大鼠分别取左心室壁、空肠、主动脉、后腔静脉,采用II型胶原酶消化、差速贴壁、差速消化法获得较纯的RMMECs、RIMECs、RAECs、RPVECs。结果表明:通过形态学特征及微血管内皮细胞和血管内皮细胞相关特异性抗原检测证实,得到高纯度RMMECs、RIMECs、RAECs、RPVECs。结论:利用胶原酶II型消化法成功分离并培养大鼠的RMMECs、RIMECs、RAECs、RPVECs,为进一步开展内皮细胞的生物学特性的相关研究提供有效的方法。     

Cytoplasmic activity in type I pulmonary epithelial cells induced by macroaggregated albumin

After the intravenous injection of radioalbumin macroaggregate, large numbers of cytoplasmic inclusion bodies were observed in the lung tissue of rats. The inclusions were located mainly in the cytoplasm of type I alveolar lining cells, appeared 40 minutes after the injection, and lasted up to 2 days. These observations suggest that the type I alveolar lining cells participate in the clearing mechanism of the lung tissue, a function that thus far has not been attributed to this type of cell.     

隧洞衬砌静力分析力学模型的研究

以文克尔弹性地基梁理论为基础,建立了隧洞衬砌静力分析的杆系结构力学模型,使其可考虑底部为弹性转动约束的情况,并对该模型进行了实例验证。研究结果表明,考虑弹性转动可使拱顶及边墙顶部截面受拉边缘处的应力增加。     

内皮祖细胞生物学特性及其对改善新血管形成的影响

内皮祖细胞(Endothelial progenitor ceils,EPCs)是可以直接分化为血管内皮细胞的一种前体细胞.当机体受到损伤、缺血或是在药物等外界因素刺激下都可动员骨髓内的内皮祖细胞参与到机体的内循环.内皮祖细胞可以通过旁分泌促血管生成因子来促进管腔直接进入发芽状态的新生血管来调节血管生成.该文综述了EPC的来源、分离培养、数量的影响因素及其对血管生成作用等几个方面.     

Requirement of type III TGF-beta receptor for endocardial cell transformation in the heart

Transforming growth factor-beta (TGF-beta) signaling is mediated by a complex of type I (TBRI) and type II (TBRII) receptors. The type III receptor (TBRIII) lacks a recognizable signaling domain and has no clearly defined role in TGF-beta signaling. Cardiac endothelial cells that undergo epithelial-mesenchymal transformation express TBRIII, and here TBRIII-specific antisera were found to inhibit mesenchyme formation and migration in atrioventricular cushion explants. Misexpression of TBRIII in nontransforming ventricular endothelial cells conferred transformation in response to TGF-beta2. These results support a model where TBRIII localizes transformation in the heart and plays an essential, nonredundant role in TGF-beta signaling.     

Receptor-mediated transport of insulin across endothelial cells

Hormones such as insulin are transported from the interior to the exterior of blood vessels. Whether endothelial cells, which line the inner walls of blood vessels have a role in this transport of hormones is not clear, but it is known that endothelial cells can internalize and release insulin rapidly with little degradation. The transport of iodine-125-labeled insulin was measured directly through the use of dual chambers separated by a horizontal monolayer of cultured bovine aortic endothelial cells. In this setting, endothelial cells took up and released the labeled insulin, thereby transporting it across the cells. The transport of insulin across the endothelial cells was temperature sensitive and was inhibited by unlabeled insulin and by antibody to insulin receptor in proportion to the ability of these substances to inhibit insulin binding to its receptor. More than 80 percent of the transported insulin was intact. These data suggest that insulin is rapidly transported across endothelial cells by a receptor-mediated process.     

Liver organogenesis promoted by endothelial cells prior to vascular function

The embryonic role of endothelial cells and nascent vessels in promoting organogenesis, prior to vascular function, is unclear. We find that early endothelial cells in mouse embryos surround newly specified hepatic endoderm and delimit the mesenchymal domain into which the liver bud grows. In flk-1 mutant embryos, which lack endothelial cells, hepatic specification occurs, but liver morphogenesis fails prior to mesenchyme invasion. We developed an embryo tissue explant system that permits liver bud vasculogenesis and show that in the absence of endothelial cells, or when the latter are inhibited, there is a selective defect in hepatic outgrowth. We conclude that vasculogenic endothelial cells and nascent vessels are critical for the earliest stages of organogenesis, prior to blood vessel function.     

心脉隆注射液对动脉粥样硬化大鼠血管内皮细胞的保护作用

目的探讨心脉隆注射液对动脉粥样硬化（AS）大鼠血管内皮细胞的保护作用.方法采用高脂饲料加维生素D3喂养8周的方法建立动脉粥样硬化大鼠的模型.将大鼠随机分为正常组、模型组、辛伐他汀组、心脉隆治疗组四组,高脂饲料喂养8周后取血测一氧化氮（NO）、内皮素（ET）、前列环素（PGI2）和血栓素（TXA2）的含量.结果心脉隆注射液给药8周后能明显的升高AS大鼠血清NO和血浆PGI2水平（P〈0.05）,显著降低血浆ET的含量（P〈0.05）.结论心脉隆注射液能保护AS大鼠血管内皮细胞,减轻动脉粥样硬化的进程,对动脉粥样硬化有治疗作用.     

蒙古绵羊胚胎大肠黏膜上皮的组织发生

[目的]研究蒙古绵羊胚胎大肠黏膜上皮的组织发生。[方法]利用组织学常规方法。[结果]蒙古绵羊胚胎大肠黏膜上皮的发育经历了单层细胞到复层细胞再到单层细胞的过程;杯状细胞在37 mm胚初见;90 mm胚直肠腺开始发育,142 mm胚盲肠、结肠肠腺开始发育。[结论]蒙古绵羊胚胎大肠黏膜上皮经历了单层细胞到复层细胞再到单层细胞的发育过程。     

仿刺参消化道的再生形态学与组织学

通过解剖和组织切片观察仿刺参Apostichopus japonicus消化道再生的外部形态和组织学变化过程。再生过程可分为4个阶段:原基形成阶段,食道和胃伸长,出现去分化现象,肠系膜游离端边缘增厚;肠腔形成阶段,食道和胃仍处于去分化状态,胃和泄殖腔两端沿增厚的肠系膜相向形成肠腔,组织分为肠腔上皮层、结缔组织层和体腔上皮层;分化阶段,消化道逐渐具备功能,食道和胃的组织结构开始重建,消化道黏膜上皮由多层立方细胞逐渐分化为单层柱状细胞,肌肉层逐渐形成;生长阶段,组织结构恢复正常,变化仅表现在生长上。     

补阳还五汤精简方对氧化应激损伤血管内皮细胞的保护作用研究

目的 观察补阳还五汤精简方对氧化应激损伤后血管内皮细胞的保护作用,并从核转录因子E2相关因子/抗氧化反应元件（NF-E2-related factor 2/ antioxidant response element,Nrf2/ARE）途径探讨其作用机制。方法 采用H2O2作用大鼠血管内皮细胞4 h建立体外血管内皮细胞氧化应激模型,根据不同处理分成正常组,模型组,补阳还五汤含药血清组（补阳组）,补阳还五汤精简方含药血清组（5%精简组、10%精简组、20%精简组）6组。采用倒置显微镜观察细胞形态;流式细胞术检测血管内皮细胞调亡;测定细胞SOD活力、MDA含量;采用Western blot法检测细胞Nrf2、血红素加氧酶-1（HO-1）蛋白的表达。结果 与模型组比较,含药血清组均能不同程度改善细胞形态,升高细胞存活率,其中10%精简组较5%精简组、20%精简组细胞损伤程度低;与模型组比较,补阳组和10%精简组可有效抑制细胞凋亡（P<0.05）;与模型组比较,补阳组及10%精简组可显著提升SOD活力（P<0.01）;补阳组、10%精简组及20%精简组可降低MDA含量（P<0.05）;补阳组及10%精简组可明显上调Nrf2、HO-1蛋白表达（P<0.05）。结论 10%补阳还五汤精简方可以显著减轻氧化应激造成血管内皮细胞的损伤,抑制细胞调亡,这一作用可能与上调Nrf2/ARE抗氧化信号通路途径表达有关。     

隧道衬砌台车有限元结构仿真及优化设计

基于有限单元法的基本思想为理论基础,用MSC／PATRAN建立隧道衬砌台车仿真模型,对其在工作状态下的工况进行MSC／NASTRAN强度、刚度分析,得到隧道衬砌台车的最大应力、应变值及分布情况。通过分析,此隧道衬砌台车有进一步优化的空间,接着在MSC／NASTRAN中定义设计变量,确定设计目标,进行优化设计。结果表明用MSC／PATRAN建模分析可以节省人力物力,又有比较高的模拟精度,对于工程实际是相当有帮助的,可以提高工程机械结构设计水平,使得结构更加合理,满足当今机械设计发展的需求,本文的研究方法适用于指导任何其他类型机械的分析。     

银杏叶提取物对体外培养心肌膜微血管内皮细胞分泌NO和ET-1的影响

研究银杏叶提取物(EGb761)对微血管内皮细胞分泌NO和ET-1的影响。采用体外培养大鼠心肌膜微血管内皮细胞(RMMMVECs)模型,测定其一氧化氮(硝酸还原酶法)和内皮素-1(ELISA法)分泌量的变化。EGb761能显著性提高RMMMVECsNO和ET-1的分泌量,且NO/ET-1值没有显著性变化。     

Glomerular sialoprotein

The high content of sialic acid in the glomerulus is associated with the cell membrane of epithelial cells lining the basement membrane. Whereas enzyme studies indicate that sialic acid is a determinant of the nephritogenic antigen, the physicochemical properties of this nephritogenic glycoprotein suggest that sialic acid may have an important role in the filtration mechanism.