当归注射液对兔主动脉平滑肌细胞中增殖细胞核抗原表达的影响

目的：观察当归注射液对平滑肌细胞（ Ｓ Ｍ Ｃ） 中增殖细胞核抗原（ Ｐ Ｃ Ｎ Ａ） 表达的影响。方法：用免疫组织化学 Ｌ Ｓ Ａ Ｂ 法检测培养的兔主动脉 Ｓ Ｍ Ｃ 中 Ｐ Ｃ Ｎ Ａ 的表达,同时测定培养液中超氧化物歧化酶（ Ｓ Ｏ Ｄ） 、脂质过氧化物（ Ｌ Ｐ Ｏ） 、前列环素（ Ｐ Ｇ Ｉ２） 及环磷酸腺苷（ｃ Ａ Ｍ Ｐ） 的含量。结果：当归注射液能增加 Ｓ Ｏ Ｄ 活性,降低 Ｌ Ｐ Ｏ 和升高 Ｐ Ｇ Ｉ２ 、ｃ Ａ Ｍ Ｐ 水平,抑制 Ｓ Ｍ Ｃ 中 Ｐ Ｃ Ｎ Ａ 的表达（ Ｐ＜ ００５ ～００１） 。结论：当归有抑制 Ｓ Ｍ Ｃ 增殖的作用。     

天花粉蛋白的二级结构和B细胞抗原表位预测

为预测天花粉蛋白(TCS)的B细胞抗原表位,采用生物信息软件和互联网服务器,预测TCS的二级结构和分析TCS表面特性(亲水性、可塑性、可及性和抗原性);再计算平均抗原指数(AI),预测TCS的B细胞抗原表位.结果TCS存在多个潜在的抗原表位,24～32序列(LPNERKLY)的AI(0.394)明显高于其他片段,24～32序列是TCS潜在的B细胞优势抗原表位.说明TCS的定点突变及免疫原性的降低提供了理论指导.     

艾滋病疫苗的研究进展

2005年初,在全球六大州19个国家共有35个艾滋病疫苗候选进入了人体早期临床实验。选用的抗原一般均着眼于诱导细胞免疫和体液免疫双重效果。从疫苗的存在形式上看,可供选择的HIV候选疫苗包括下列几种:传统疫苗(灭活疫苗和减毒活疫苗)、合成肽和蛋白亚单位疫苗、DNA疫苗以及活载体疫苗。目前新型疫苗研究策略包括抗原改造加强免疫原性、免疫佐剂协同以提高疫苗免疫反应强度;新型免疫策略包括初免/加强免疫策略和粘膜免疫策略。由于粘膜感染是艾滋病病毒感染的主要途径之一,因而,探索经粘膜免疫是未来疫苗发展的重要方向。中国艾滋病疫苗研究领域的现状是挑战与机遇并存,需要相关领域专家的共同努力,以促进我国艾滋病疫苗研究的发展。     

新型免疫疫苗——DNA疫苗

DNA疫苗是近几年发展起来的一种新型疫苗 .将抗原编码基因插入带有强启动子的质粒载体,然后用物理方法将重组质粒导入体内细胞,抗原编码基因即在细胞内合成抗原蛋白,诱发机体产生保护性免疫反应 .DNA疫苗是独特而有效的接种方法,实验证明它可以用来抵抗病毒感染和医治肿瘤等,有广泛的应用前景 .     

Identification of a novel resident centrosomal protein

One human autoimmune serum was identified to react with centrosomes by immunofluorescence. We applied the affinity purification of membrane-bound antibody technique and demonstrated that the antibodies present in this antiserum reacted with a 31/29 ku centrosomal antigen. Immunofluorescence showed that this antigen is located at centrosome in a cell-cycle independent manner, and thereby it belongs to the family of centrosomal residents. We then uti- lized this autoimmune serum and antibodies against centrin and gamma-tubulin to investigate changes of centrosome cycle kinetics during premature chromosome condensation (PCC) artificially induced in V79-8 cells. We show here that centrosomal proteins continue to express when cells are synchronized at G1/S boundary and S phase by Hydroxyurea (HU). During this time, the addition of caffeine causes cells with unreplicated genome to go into mitosis, and induces the separation of the replicated centrosomes. These results suggest that the coordination of DNA synthesis and centrosome replication in the normal cell cycle can be uncoupled. Cells ensure that centrosome duplicates once, and only once during each DNA synthesis cycle through the tight and subtle coordination of cell cycle engine molecules, and thereby the assembly of bipolar spindle and the accurate transmission of genetic information.     

H-Y antigen expression in heterogametic males (XY) and females (ZW): a factor in reproductive strategy?

Summary The cells of heterogametic females with ZW sex chromosomes express H-Y or H-W antigen. A hypothesis is formulated to explain why these animals are capable of practicingamphigonia retardata, i.e. delay in actual fertilization of eggs by retaining viable sperm within the oviduct for a considerable time (several months).     

Isolation and analysis of SSEA-4 positive cells derived from fetal marrow mesenchymal stem cells

Mesenchymal stem cells (MSCs) can be differentiatedinto bone, cartilage, adipocyte and some other tissue cells following induction and they are good seed cells in cell therapy and tissue engineering fields. Human fetal mesenchymal stem cells (fMSCs), de- …     

产毒素大肠杆菌LTB-K99融合基因的构建

利用PCR技术从原始菌种中扩增得到K99和LTB基因,将K99和LTB基因连接起来,构建了LTB-K99融合基因.融合基因克隆到pBS-T载体上,转化大肠杆菌top10,经Bam HI和Xho I双酶切鉴定重组质粒.测序分析结果表明,该融合基因有正确的阅读框,为以后转入表达载体的构建奠定了基础.     

白假丝酵母的快速分离鉴定

白假丝酵母又称白色念珠菌，是一种单细胞真菌，由于近年来人类在医疗过程中大量使用抗生素、医疗导管等高新技术，导致念珠菌病呈明显上升趋势，研究白假丝酵母致病性的工作也日益增加，快速分离鉴定白假丝酵母就显得尤为重要．从形态学、生理生化反应、免疫、基因探针技术、PCR技术、基因芯片技术等方面综述了分离鉴定白假丝酵母的方法．并对不同分离鉴定手段进行了评价。     

Rudimentary study on humanization of porcine red blood cells:Enzymatic removal of galactose-α1,3-galactose antigen from porcine red blood cell

The serological and biochemical characterization of porcine red blood cells (pRBCs) are similar to human red blood cells,Porcine erythrocytes are considered as an alternative source for human blood transfusion.But there exist galactose-α1,3-galactose antigens (Galα1,3Galβ1,4galNAc-R,abbreviated αGal antigen ) on pRBCs,which can induce anti-αGai antibodies in human serum ,The αGal epitopes are the major antigen responsible for hyperacute rejection in exnotransfusion .In this study ,recombined soybean α-galactosidase (rSα-GalE) was used to remove the αGal antigens from pPRCs for humanization .The results showed that αGal antigen was eleared by rSα-GalE and the structure and function of rSα-GalE treated pRBC were normal.