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.     

房室结逆向传导电生理特点的观察

目的研究房室结逆向传导的电生理特点。方法分析在我院行电生理检查和／或射频消融的成年患者中电生理资料比较完整的300例患者的房室结逆传电生理特点。结果射频消融术后有161例（54％）有房室结逆传。有逆传患者的前传功能要好于无逆传的患者，对于术后存在室房逆传的患者，逆传功能均明显差于前传功能。射频消融术后有28例（17％）经房室结逆传最早激动冠状静脉窦口，其逆传功能较最早激动希氏束电图的病例相比要差，而两者的前传功能差异无统计学意义。结论射频消融术后54％的患者存在房室结逆传，可能是正常人群中室房逆传的真实反映。有室房逆传患者的房室结前传功能优于无室房逆传者，也优于其本身的逆传功能。房室结逆传冲动进入心房可能存在两条不同的通路。     

派罗欣治疗慢性乙型病毒性肝炎的观察与护理

目的探讨乳腺癌术后胸部气压固定带的制作及临床应用价值。方法将64例乳腺癌术后患者随机分为观察组和对照组各32例,对照组采用传统的绷带加压包扎,观察组采用自行设计并制作的胸部气压固定带加压包扎。观察两组术后引流量、拔管时间及并发症的发生情况。结果观察组皮下积液发生率显著低于对照组（P〈0.05）,术后24h引流量、置管时间显著少于/短于对照组（均P〈0.01）。结论乳腺癌术后使用胸部气压固定带加压固定可减少渗出,缩短置管时间,降低皮下积液发生率。     

苦参液雾化吸入辅助治疗小儿哮喘

目的:观察苦参液雾化吸入辅助治疗小儿哮喘的临床疗效.方法:本组88例,随机分成中西药治疗组及西药对照组,每组44例,对照组常规用抗生素、激素及口服美喘清;治疗组常规用抗生素、激素,并用苦参液雾化吸入.结果:治疗组44例,哮喘症状及体征消失时间均短于对照组(p＞0.05).结论:苦参液雾化可作为小儿哮喘的重要辅助治疗方法之一.     

肺炎衣原体抗体效价与多发性硬化的相关性探讨

目的 探讨肺炎衣原体（Chlamydia pneumoniae）感染在多发性硬化（MS）发病和进展中的作用和致病机制。方法 选取急性期MS患者31例，缓解期MS患者28例及其他神经系统疾病患者30例，健康对照者30名，应用酶联免疫吸附试验测定患者和对照者血清及脑脊液中肺炎衣原体IgG和IgM抗体水平。结果 急性期MS组、缓解期MS组、其他神经系统疾病组和健康对照组的肺炎衣原体血清IgG分别为48．4％、35．7％、30．0％、23．3％；4组IgM抗体效价分别为12．9％、14．3％、20．0％、10．0％，总体比较差异无统计学意义（P〉0．05）；急性期MS组与其他神经系统疾病组的脑脊液IgG和IgM抗体效价分别为0、6．7％和0、0，差异无统计学意义（P〉0．05）。结论 肺炎衣原体的感染或重复感染与MS发病相关不紧密，可能仅为MS的伴随感染。     

自体腹白线片修补十二指肠溃疡穿孔(附13例报告)

目的探讨用游离自体腹白线片修补急性十二指肠溃疡穿孔的应用价值。方法从2006年1月至2006年7月对13例用自体腹白线片修补急性十二指肠溃疡穿孔的病人的临床资料和随访情况进行回顾性分析,其中2例穿孔大于2cm2,平均手术时间60分钟,平均失血量20ml,平均住院天数9±1天。结果游离自体腹白线片修补急性十二指肠溃疡穿孔13例均痊愈出院。随访15天至6个月,无手术并发症。结论本方法操作较简单、安全、效果好,其适应症广,是一种可行的新方法。     

妇幼卫生专业毕业生的追踪调查

20 0 2年 9～ 1 2月对中山大学公共卫生学院妇幼卫生专业的毕业生及用人单位进行了信函追踪调查。结果表明 :总体而言 ,该系学生思想素质、业务水平、工作能力均较强 ,受到用人单位的一致好评。该系学生保健服务能力是强项 ,体现了“以保健为中心”的办学思想。但同时也发现妇幼系的培养模式、课程设置、教学方法均存在一定问题 ,最突出的是临床动手能力较差 ,其次为社区工作能力、组织管理能力、社交能力相对不足 ,创新能力较差 ,所以教学改革势在必行     

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。     

Reduced expression of CD69 and adhesion molecules of T lymphocytes in asthmatic children receiving immunotherapy

T lymphocytes play a fundamental role in the initiation and regulation of chronic inflammatory responses in patients with asthma. CD69 is an early marker of T‐cell activation. The levels of intercellular adhesion molecule‐1 (ICAM‐1, CD54) and L ‐selectin have been reported to increase in patients with allergic diseases and asthma. The present study was therefore undertaken to investigate the expression of CD69, CD54, and L ‐selectin by T lymphocytes of children with asthma, before and after immunotherapy. Eighteen children newly diagnosed with asthma, 11 good and nine poor responders to immunotherapy, and 16 normal subjects, were enrolled in this study. The percentages of CD69⁺, CD54⁺, and CD62L⁺ cells in T lymphocytes were measured by using flow cytometry. The levels of CD69, CD54, and CD62L in serum and culture supernatants were determined by using enzyme‐linked immunosorbent assay (ELISA). The expression of CD69 and CD54 on CD3⁺ T lymphocytes was significantly higher in children with asthma than in control patients. All the patient groups expressed (spontaneously and following stimulation with phorbol myristate acetate and ionomycin together with mite‐extract proteins) greater amounts of CD69 and CD54 than did control subjects. With long‐term immunotherapy, the percentages of CD69⁺ and CD54⁺ T lymphocytes were significantly lower in patients with a good response to immunotherapy. Our results also showed significantly lower serum L ‐selectin levels following immunotherapy. In conclusion, successful immunotherapy resulted in decreased expression and production of CD69 and CD54. These results may explain, in part, the clinical efficacy of immunotherapy.     

扇形额肌筋膜瓣悬吊治疗上睑下垂

目的：探计上睑下垂的较好治疗方法，以改进治疗效果方法：设计井应用扇形额肌筋膜瓣悬吊治疗上睑下垂，结果应用本方击治疗上睑下垂83倒，126只眼，致采满意。其中43例经3个月-10年随访，除3例(4只眼)下垂复发外，其余均取得了良好效果，未见其他并发症发生。结论：本方法的主要特点是扇形筋膜瓣有丰富的血供，并且能均衡覆盖在睑板上以充分上提上睑，符合生理和解音4的要求。