川芎素对大鼠脑缺血再灌注时突触后致密物质-95活性的影响

应用神经行为学评估、脑梗死容积测量和Western blot分析,探讨研究阿魏酸钠(SF)的神经保护作用及其对局灶性脑缺血损伤时突轴后致密物质-95(PSD-95)活性的影响,证实SF明显改善再灌注24 h神经功能缺陷和减少脑梗死容积,显著增强再灌注后PSD-95表达,表明SF可能通过加强PSD-95活性来改善缺血性损伤.     

血管性痴呆小鼠海马突触后致密物95表达的研究

目的:探讨血管性痴呆(vascular dementia,VD)小鼠海马突触后致密物95(postsynaptic density95,PSD-95)表达的变化。方法:双侧颈总动脉线结,反复缺血-再灌注法制备小鼠VD模型,跳台试验观测其行为学改变,免疫组织化学方法观察海马齿状回PSD-95的表达。结果:模型组小鼠学习、记忆成绩下降(P<0.05),其海马齿状回(dentategyrus,DG)PSD-95免疫阳性产物较对照组明显减少(P<0.05)。结论:VD模型小鼠学习记忆能力下降可能与海马PSD-95的表达减少有关。     

Fas/Apo-1在下肢静脉性溃疡的表达

目的 探讨Fas/Apo-1(CD95)在下肢静脉性溃疡的表达及意义.方法 采用流式细胞技术、半定量逆转录-聚合酶链反应(RT-PCR)和免疫组织化学方法检测不同体位下肢外周血和局部皮肤Fas/Apo-l(CD95)的表达.结果 溃疡组平卧位、下垂位血液中Fas/Apo-1(CD95)阳性细胞数分别为41.45±14.25、40.20±12.42,mRNA为0.74±0.33、0.78±0.22,皮肤中阳性细胞数为42.62±22.19、46.50±20.12,分别与无溃疡组和对照组比较,差异均有统计学意义(P<0.05);无溃疡组和对照组比较,差异无统计学意义(P>0.05);不同体位之间Fas/Apo-1(CD95)阳性细胞数和含量比较,差异无统计学意义(P>0.05).结论 Fas/Apo-1高表达可能与下肢静脉性溃疡发生密切相关.     

细粒棘球蚴95抗原基因的克隆及原核表达质粒的构建

目的：克隆细粒棘球蚴95（Eg95)抗原基因，构建携带目的基因的原核表达载体，为细粒棘球蚴抗原的免疫保护机制研究提供材料。方法：应用PCR方法从细粒棘球蚴cDNA文库中克隆获得Eg95抗原基因，将其克隆至pUCm-T载体，测序确定其正确性。利用定向克隆技术将Eg95抗原基因片段克隆至原核表达质粒pET28上，根据选择标记的卡那霉素抗性基因筛选到阳性克隆，通过酶切分析和PCR鉴定筛选出阳性克隆，测序确定序列。结果：测序表明所有pET28-Eg95阳性克隆均为正确连接95抗原基因的重组质粒。结论：pET28-Eg95可以进一步用于重组蛋白的表达及抗细粒棘球蚴感染的实验研究。     

Prenatal exclusion of choroideremia

We performed prenatal testing to predict the inheritance of choroideremia (CHM) using a linked polymorphic DNA marker, DXS95. DNA analysis of chorionic villi at the 12th week of pregnancy indicated that the allele at risk had not been passed from the heterozygous mother to the fetus. This prenatal exclusion of choroideremia was confirmed by polymerase chain reaction-single-strand conformation polymorphism (PCR-SSCP) analysis. © 1992 Wiley-Liss, Inc.     

Activation induces apoptosis in Herpesvirus saimiri-transformed T cells independent of CD95 (Fas,APO-1)

Signaling via the T cell receptor (TCR)/CD3 complex of pre-activated T cells induces apoptosis. Such an activation-induced cell death (AICD) is thought to play an important role in the regulation of cellular immune responses. In this study we analyzed pathways of AICD by using human T cells transformed by Herpesvirus saimiri. These growth-transformed T cells show the phenotype of activated mature T cells and continue to express a functionally intact TCR. We show that human H. saimiri-transformed T cell clones readily undergo cell death upon signaling via the TCR/CD3 complex or via phorbol 12-myristate 13-acetate (PMA) + ionomycin. The AICD in H. saimiri-transformed T cells was detectable a few hours after activation and it was not affected by the presence of interleukin (IL)-2 or by anti-CD4 cross-linking. However, AICD required tyrosine phosphorylation, since it could be blocked by herbimycin A. Cyclosporin A (CsA) did not block the development of AICD, but other consequences of activation in H. saimiri-transformed T cells like the production of interferon-γ. Surprisingly, the development of AICD was not reduced by neutralizing antibodies to tumor necrosis factor (TNF)-α or blocking antibodies directed to CD95 (Fas, APO-1), although H. saimiri-transformed T cells were sensitive to CD95 ligation. To confirm that this form of AICD is really independent of CD95, we have established an H. saimiri-transformed T cell line from a patient with a homozygous deletion in the CD95 gene. This CD95-deficient T cell line was as sensitive to AICD as other CD95-expressing H. saimiri-transformed T cells. In conclusion, we describe here a type of AICD in H. saimiri-transformed T cells that is independent of CD95 and TNF-α, not sensitive to CsA, but requires tyrosine phosphorylation. This system should be useful for the investigation of CD95-independent forms of AICD.     

Muscle-epidermis interactions affect exoskeleton patterning in Caenorhabditis elegans.

The C. elegans hypodermis is a single epithelial cell layer separated from the musculature by a thin basement membrane on its basal surface. The hypodermis secretes the extracellular material of the cuticle from its apical surface. The regulation of cuticle synthesis and apical secretion is not well understood. UNC-95 is a component of the muscle dense bodies and M-lines, which are integrin-based adhesion complexes required for force transduction to the cuticle. Using gene expression profiling and in vivo assays, we show that, in unc-95 mutant worms, there is an increase in expression levels of a group of hypodermal and pharyngeal genes related to cuticle structure and molting. Moreover, the cuticle structure of unc-95 mutant adult is impaired. Our findings suggest that aberrant force transduction from the structurally impaired muscle attachments across the basement membrane to the underlying hypodermis elicits intercellular signaling that plays a role in regulating cuticle synthesis and patterning.     

淋巴细胞共刺激信号和凋亡信号异常与RA免疫效应亢进的研究

目的：探究T淋巴细胞表面多种细胞信号分子所介导的细胞活化或凋亡信号在RA患者免疫功能紊乱中的作用。方法：采用流式细胞术检测RA患者外周血T细胞亚群及其表面共刺激分子cD154（cD40L）、CD30和凋亡受体CD95（Fas）的表达。结果：RA患者外周血T细胞亚群偏移，CD4^＋T细胞增加，CD8^＋T细胞减少；共刺激分子CD154在CD4^＋和CD8^＋T细胞上的表达均上调，但CD30分子的表达均降低，并以CD4^＋T细胞降低更为明显。同时，凋亡受体CD95分子在T细胞亚群上的表达均明显增加。结论：RA患者T淋巴细胞表面多种信号分子表达异常，共同导致了RA患者免疫功能紊乱。     

细粒棘球绦虫重组BCG-Eg95疫苗诱导的保护力观察

目的 探讨细粒棘球绦虫重组BCG-Eg95疫苗免疫鼠后对Eg原头节攻击感染的保护性作用.方法 '将细粒棘球绦虫重组BCG-Eg95疫苗采用皮下注射、鼻腔内接种、口服灌胃和肌肉注射4种途径分别免疫Balb/C鼠,免疫后8W用Eg 原头节进行攻击感染,感染后18周剖杀小鼠,计算减蚴率,测定血清中IgG及其亚类和IgE水平,同时设有BCG和PBS对照.结果 疫苗接种组的减蚴率为18.20%～92.46%,血清IgG、IgG2a、IgG2b水平明显升高,IgG1、IgG3和IgE显著降低.结论 细粒棘球绦虫重组BCG-Eg95疫苗口服灌胃和肌肉注射是两种较好的接种途径,IgG、IgG2a和IgG2b在疫苗诱导的保护力中起重要作用.