热休克反应对大鼠感染性脑水肿脑组织诱生型一氧化氮合酶mRNA表达的影响

:探讨热休克反应 (HSR)对百日咳杆菌所致的大鼠感染性脑水肿诱生型一氧化氮合酶 (iNOS)mRNA表达的影响。方法 :从大鼠左侧颈内动脉注入百日咳菌液制备感染性脑水肿 (感脑 )模型 ,采用组织细胞原位杂交技术检测脑组织iNOSmRNA的表达。结果 :生理盐水组、4h感脑组及 4h热休克处理组均未见iNOSmRNA表达 ,8h ,2 4h时感染性脑水肿组均有明显的杂交信号 ,以 2 4h更为明显 ;而 8h ,2 4h热休克处理组仅有少数细胞有阳性信号。结论 :热休克反应对感染性脑水肿的保护作用可能与抑制iNOSmRNA的表达有关     

痘苗病毒寡核苷酸检测芯片的设计及研制

目的 对痘苗病毒进行寡核苷酸检测芯片的初步研究，为建立寡核苷酸芯片检测该类病毒提供初步研究依据。方法 根据痘苗病毒特异基因设计寡核苷酸探针，人工合成探针后制备寡核苷酸芯片。在病毒感染的不同阶段提取病毒样品DNA及阴性样品DNA，采用限制性显示技术标记，标记样品与芯片杂交后，用Agilent芯片扫描仪检测杂交结果。结果 芯片与病毒样品杂交有较强的杂交信号，而与阴性样品杂交除阳性探针外均无信号。结论 病毒样品与阴性样品杂交信号区别明显，在病毒感染的各个时段也都有明显的杂交信号，反映了寡核苷酸芯片具有较高的特异性和灵敏度。     

女性运动试验后QTc与ST的对比分析

作者测量100例妇女心电图运动试验后即刻QTc间期。冠心病组50例运动后即刻QTc间期比静息时明显延长(P<0.001),比正常配对组50例则明显缩短(P<0.001)。以QTc间期延长≥0.01秒力阳性指标,与ST段压低比较,其敏感性可从42％提高至70％,特异性从66％提高至76％;如综合QTc间期与ST段标准加以判断时,可使敏感性、特异性分别增至74％、88％。     

戊二醛交联提高胶原/壳聚糖真皮支架抗细胞收缩能力的研究

目的 应用交联处理的胶原支架,来减缓其降解过多、易收缩变形、机械性能不足等缺点.方法 采用冷冻-冻干法构建胶原/壳聚糖多孔支架,并通过戊二醛交联构建具有良好抗细胞收缩稳定性和细胞相容性的胶原支架.通过测定不同培养时间各类支架的尺寸变化,研究了戊二醛交联对支架抗细胞收缩能力的影响.结果 戊二醛交联后的胶原/壳聚糖支架未见明显收缩,其细胞活性也始终高于干热交联支架.结论 戊二醛能有效地提高胶原基支架的抗细胞收缩能力,并保持其良好的生物相容性.     

The correlation between TNF-α, IL-6 in cervical mucous during follicular development and ovulation stimulation in different protocols

Objective To investigate the correlation between TNF-α and IL-6 levels in cervical mucous during follicular development and ovulation stimulation in different protocols.Methods 36 infertile women were set up as experimental groups,divided into CC, HMG, IVF-ET group,each group consisted of 12 infertile women and 15 women with normal menstrual cycles were choiced as control group.Cervical mucous during follicular phase, luteal phase and ovulation phase were collected.TNF-α, IL-6 levels in cervical mucous were measured by radioimmunology assay (RIA).Follicular development were monitored by transvaginal ultrasonagraphy.Results (1) TNF-α levels in cervical mucous of experimental groups and control group were periodically various among the reproductive cycle.It increased during follicular phase, reached to peak during ovulation phase, and decreased during luteal phase (P＜0.05).IL-6 levels had no obvious periodical changes.(2) Compared with CC and control group, levels of TNF-α,IL-6 in HMG and IVF-ET group were significantly higher (P＜0.05).(3) Levels of TNF-α and IL-6 in cervical mucous were positively correlated with the dominant follicle diameter (r=0.261, r=0.192 respectively,P＜0.05).(4) TNF-α and IL-6 showed positive correlation in the reproductive cycle (r=0.782,P＜0.05).Conclusions (1) TNF-α level shows a cyclic change in the reproductive cycle and peaks during ovulation,whereas IL-6 level does not.(2) TNF-α and IL-6 may play a certain role in the process of follicular development and ovulation.(3)The levels of TNF-α and IL-6 are up-regulated by gonadotrophic hormone.(4) TNF-α and IL-6 may have coordination properties and participate in the same biological effects.     

Influence of TAT-peptide polymerization on properties and transfection activity of TAT/DNA polyplexes.

Use of bioactive cationic peptides as gene carriers is limited by instability of their DNA complexes in vivo and by the loss of their biological activity due to undesired interactions of their bioactive parts with the DNA. To overcome the two major limitations, biodegradable high-molecular-weight form of TAT peptide (POLYTAT) sensitive to cellular redox-potential gradients was synthesized in this study by oxidative polycondensation. Physicochemical and transfection properties of DNA polyplexes based on POLYTAT were investigated and compared with polyplexes based on TAT polymer prepared by in situ template-assisted polymerization. Physicochemical properties of TAT-based polyplexes were affected by the molecular weight and method of polymerization of the TAT peptide. All TAT-based DNA polyplexes exhibited reduced cytotoxicity when compared with control polyethylenimine (PEI) polyplexes. Polyplexes based on both high-molecular-weight TAT polypeptides exhibited increased transfection efficiency compared to control TAT peptide but lower than that of PEI polyplexes. The evidence shows that transfection activity of TAT-based polyplexes is strongly dependent on the presence of chloroquine and therefore suggests that TAT polyplexes are internalized by an endocytosis. Overall, high-molecular-weight reducible polycations based on bioactive peptides has the potential as versatile carriers of nucleic acids that display low cytotoxicity and can prove to be especially beneficial in cases that require surface presentation of membrane-active or cell-specific targeting peptides.     

黄芪、雷公藤多甙对大鼠肾小球系膜细胞分泌IL-6的影响

目的:观察黄芪和雷公藤多甙对大鼠肾小球系膜细胞分泌IL-6水平的影响.方法:应用细胞培养技术进行肾小球系膜细胞培养,采用血清药理学方法,制备黄芪药物血清,雷公藤多甙药物血清,并分为低、中、高3个剂量梯度,观察药物血清对正常状态下肾小球系膜细胞分泌IL-6的影响,采用细胞ELISA法测定IL-6含量.结果:黄芪、雷公藤多甙各不同剂量组均可抑制肾小球系膜细胞产生IL-6,其抑制作用随剂量增加而增殖,其中尤以雷公藤高剂量组、中剂量组及黄芪高剂量组作用明显.结论:黄芪可抑制肾小球系膜细胞分泌IL-6,这一作用与雷公藤类似.这可能是黄芪防治肾小球硬化的作用机制之一.     

血管性勃起功能障碍动物模型的建立

目的探索建立血管性勃起功能障碍(ED)动物模型。方法雄性新西兰大白兔给予胆固醇及高脂饮食,同时用球囊导管损伤双侧髂内动脉内皮。测定术后4周、8周血脂并观察阴茎勃起情况、交配情况,同时用阴茎海绵体注射盐酸罂粟碱、阴茎血管双核素检查、髂内动脉数字减影造影(DSA)等方法研究勃起功能。结果与对照组相比,术后4周、8周模型组动物出现明显高脂血症,勃起程度明显下降,交配实验的各项观察指标均显著降低(P＜0.01),动脉造影显示双侧髂内动脉管腔直径明显缩小,双核素检查动脉显像指数(PIA)及静脉显像指数(PIV)明显降低,但第4周的模型组与对照组PIV结果没有统计学差异(P＞0.05)。结论高脂、高胆固醇饮食同时用球囊导管扩张动物髂内动脉,可以加速模型的形成,从而用于血管性ED的进一步研究。     

栀子提取液对大鼠急性胰腺炎时TNF-α和IL-6改变的影响

目的：探讨急性胰腺炎时血清TNF-α和IL-6的变化以及栀子提取液对其的影响。方法：SD大鼠造模后口服给予栀子提取液进行药物治疗，24h后呆血测淀粉酶、TNF-α和IL-6，并分组对比，取胰腺组织做病理学检查。结果：急性胰腺炎时血淀粉酶、TNF-α和IL-6水平显著升高，镜下见大量炎细胞浸润，栀子提取液可改善上述变化。结论：栀子提取液对大鼠急性胰腺炎有治疗作用。