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。     

胶质细胞瘤复发前后Cyclin D1和P16的表达

目的　探讨CyclinD1,P16在胶质瘤复发前后表达改变及其意义。方法　采用免疫组织化学LsABC法对 4 5例复发胶质瘤瘤组织、瘤旁脑组织和 10例正常脑组织CyclinD1,P16蛋白表达进行检测 ,统计分析CyclinD1,P16表达水平与胶质瘤分级、肿瘤复发的关系。结果　正常脑组织 ,瘤旁脑组织和胶质瘤组织CyclinD1表达依次升高 ,而P16的表达依次下降 ;肿瘤复发CyclinD1表达增强 ,P16的表达减弱。结论　CyclinD1与P16的表达与胶质瘤恶性进程和复发密切相关。     

近端/远端复合肌肉动作电位振幅比率在术后面神经功能评估上的价值

目的 探讨近端/远端复合肌肉动作电位振幅比率在术后面神经肿瘤侵犯段功能评估上的价值和对早期面神经修复的指导意义。方法 比较术末面神经近端/远端复合肌肉动作电位振幅比率和术后2周、6个月患侧面神经功能的H-B分级之间的关系。结果 术后6个月面神经H-B分级恢复到Ⅰ-Ⅱ级者,术末近端/远端复合肌肉动作电位振幅比率均>0.3。结论 术末面神经近端/远端复合肌肉动作电位振幅比率是判断术后面神经远期功能,特别是肿瘤侵犯段功能的重要指标,为术中直接修复面神经提供了指导依据。     

利培酮、氯氮平治疗精神分裂症患者生活质量的长期随访对照研究

目的　探讨长期服用利培酮对精神分裂症患者生活质量的影响作用。方法　对 1997年 7月～ 2 0 0 0年 6月住院服用利培酮或氯氮平治疗达痊愈或显著进步、出院后回归社会达 18个月及以上的 174例精神分裂症患者 (利培酮 89例、氯氮平 75例 )的生活质量进行了分别于 2 0 0 0年 7月和 2 0 0 1年 7月进行了两次追踪随访对照研究。结果　第二次随访利培酮组患者的随访成功率高于氯氮平组 (χ2 =34.11,P <0 .0 0 0 1) ;利培酮组患者的生活质量两次随访结果均极显著高于氯氮平组 ,且利培酮组患者的生活质量较之一年前随访又有新的提高 ,多元逐步回归分析表明 :出院时服用药物剂量和种类是影响患者生活质量的较强因素。结论　利培酮能够提高精神分裂症患者的生活质量 ,远期疗效更突出