内皮祖细胞在血管组织工程的应用

内皮祖细胞是一群具有游走特性,能进一步增殖分化成为成熟内皮细胞的幼稚内皮细胞.内皮祖细胞参与了出生后缺血组织的血管发生和血管损伤后的修复.内皮祖细胞的发现为血管组织工程种子细胞增添了一个新来源.本文重点介绍成体内皮祖细胞的来源、鉴定、生物学特性、功能以及在血管组织工程中的应用.     

以HPLC法测定马来酸氯苯那敏含量的方法中马来酸峰及氯苯那敏峰定位的问题

目的：探讨在《国家药品标准化学药品地方标准上升国家标准》收载品种中采用HPLC方法测定马来酸氯苯那敏的含量时，所采集的HPLC图谱中，出现的马来酸峰与氯苯那敏峰保留位置如何确定的问题。方法：采用高效液相色谱法，色谱柱：Waters C18（4．6mm×150mm，5μm），江苏淮阴C18（4．6mm×250mm，5μm）；流动相：庚烷磺酸钠溶液（冰醋酸调pH值至3．3）-甲醇-乙腈（25：30：18）；检测波长262nm。结果：在本文收集的试验条件下所采集的色谱图中，马来酸氯苯那敏对照品均出现了前后两个峰，马来酸峰与氯苯那敏峰保留位置可能在不同的色谱条件下有明显变化。结论：色谱图中马来酸峰与氯苯那敏峰保留位置应加以确定，以防止对马来酸氯苯那敏对照品纯度产生疑虑。     

气管组织工程的研究策略及其展望

气管组织工程是近10年来国内外研究的热点和难点问题,取得了一些进展.但如何更好地遴选基质材料、实现种子细胞共培养、上皮化以及再血管化来构建组织工程化气管仍需要不断寻求新的研究思路和策略.本文从气管重建和理想化气管替代物的角度,回顾了近年来在组织工程气管方面的研究进展,并对未来的研究作出展望.     

Cell cycle dependent intracellular distribution of two spliced isoforms of TCP/ILF3 proteins

TCP80 is an approximately 80kDa mammalian cytoplasmic protein that binds to a set of mRNAs and inhibits their translation in vitro and ex vivo. This protein has high sequence similarity to interleukin-2 enhancer-binding factors (NF90/ILF3) and the M-phase phosphoprotein (MPP4)/DRBP76. A 110kDa immunologic isoform of TCP80/NF90/MPP4/DRBP76, termed TCP110, also is present in cytoplasm and nuclei of many types of cells. A cDNA sequence coding for TCP110 was derived by 5(')RACE. The TCP110 sequence is identical to ILF3. The gene coding for TCP110/ILF3 mapped to human chromosome 19 and the gene organization was analyzed using TCP80 and TCP110/ILF3 cDNA sequences. The TCP/ILF3 gene spans >34.8kb and contains 21 exons. At least one alternatively spliced product involving exons 19-21 exists and predicts the formation of either TCP80 or TCP110/ILF3. However, the functional relationships of TCP80 and TCP110/ILF3 required elucidation. The metabolic turnover rates and subcellular distribution of TCP80 and TCP110/ILF3 during the cell cycle showed TCP80 to be relatively stable (t(1/2)=5 days) in the cytoplasmic compartment. In comparison, TCP110/ILF3 migrated between the cytoplasmic and nuclear compartments during the cell cycle. The TCP110 C-terminal segment contains an additional nuclear localizing signal that plays a role in its nuclear translocation. This study indicates that the multiple cellular functions, i.e., translation control, interleukin-2 enhancer binding, or cell division, of TCP/ILF3 are fulfilled by alternatively spliced isoforms.     

动物实验模型中多极导管心室除颤系统电除颤对心脏功能的影响

评价新型的双极和三极导管自动心室除颤系统电除颤对左心室收缩和舒张功能的影响。动物麻醉后,在X光机指导下,分别在10只犬心脏内装置双极导管自动除颤系统（组Ⅰ）;在10只猪心脏内装置三极导管自动除颤系统（组Ⅱ）;并行电除颤试验。使用食管超声心动图在电除颤前后记录二维、M型和多谱勒超声图像。组I动物接受4次电除颤,电量为64J;组Ⅱ接受平均8次电除颤,电量为210J。结果显示：左室收缩面积分数、左室等容舒张时间和二尖瓣血流E波与A波速度比值以及时间-流速积分比值等反映左室舒缩功能的指标在两组动物除颤后均无显著改变。研究表明：两种经静脉导管自动心室除颤系统中反复低能量心内膜电除颤对左室舒缩功能无明显损伤作用;研究结果为经静脉多极导管自动心室除颤系统在临床的应用和电生理研究提供了可靠的实验数据。     

用液晶开关实现RDS立体成像的方法学研究

本文报道以ＲＤＳ立体图作为检测图形，用液晶开关实现其三维立体显示的一些探索性研究，用液晶开关眼镜作为立体图的同步分离部件。使得本系统建立于继时法成像的基础上，因而消除了“红绿竞争”等影响检出精度的因素；系统采用帧频作为同步切换的总控信号，使ＣＲＴ的视页切换与液晶眼镜开关同步，为此而开发出的显示寄存器编程技术解决了ＣＲＴ视页切换的超高速要求。     

高效凝胶色谱一步法制备级纯化单克隆抗体

作者采用ＰｈａｒｍａｃｉａＳｅｐｈａｃｒｙｌＳ—３００凝胶色谱柱，建立了ＩｇＧ类ＭｃＡｂ的一步法制各级纯化方法。该法是将ＭｃＡｂ腹水直接上样，用ｐＨ７．４１０ｍｍｏｌ／ＬＰＢＳ洗脱（流速０．５ｍｌ／ｍｉｎ），即得到纯化的ＭｃＡｂ。一次上样量４０～５０ｍｌ腹水，回收率为８５％－９０％．整个纯化周期４ｈ。纯化的ＭｃＡｂ经ＳＤＳ—ＰＡＧＥ测定，纯度＞９０％，免疫组化ＡＢＣ法测定活性为１：８００００（７．８×１０－１１ｍｏｌ／Ｌ）。该法操作简单、快速，只要有一台核酸／蛋白检测仪，便可进行制备级水平的纯化。     

Schistosoma japonicum-infected mice show reduced hepatic fibrosis and eosinophilia and selective inhibition of interleukin-5 secretion by CD4+ cells after treatment with anti-interleukin-2 antibodies.

Schistosoma japonicum-infected mice were injected with antibodies to interleukin-2 (IL-2) and/or IL-2 receptor to clarify the role of IL-2 on the granulomatous reaction around schistosome eggs in the liver. Granulomas were of normal or slightly increased size in animals subjected to IL-2 blockade, but hepatic fibrosis was markedly decreased in treated animals 10 weeks after infection. Anti-IL-2 treatment significantly decreased the in vitro secretion of IL-5 by antigen-stimulated spleen cells, and peripheral eosinophilia and tissue eosinophilia were diminished. Secretion of IL-2, IL-4, and gamma interferon was unaffected. Our results indicate that IL-2 is not an essential determinant of granuloma size in S. japonicum-infected mice but that, as in Schistosoma mansoni infection, the development of hepatic fibrosis is critically dependent on IL-2 levels and granuloma size and hepatic fibrosis are differentially regulated.     

牙龈组织基膜超微结构的破坏与慢性牙周炎相关性之研究

对17例慢性牙周炎患者牙龈组织基膜进行电镜观察发现,随着病情加重基膜出现增生,断裂,分离及多层化等不同程度的改变,与基膜关系密切的微原纤维亦称耐酸纤维,同时严重受损并形成颗粒样物,沉集在基膜附近,在基膜断裂之穴口中可见有胶原纤维嵌入。这样既破坏了基膜的防御屏障,也阻碍了牙周其它正常组织的修复,从而进一步加深了牙周病的发展。