声诺维增强超声辐照介导pEGFP-N1转染RPE细胞的实验研究

目的探讨超声与微泡造影剂声诺维（SonoVue）介导基因转染体外培养RPE细胞的作用。 方法在24孔板中,用1MHz,2W/cm2,50Hz的脉冲波辐照RPE细胞2min,质粒用量6μg/孔,加或不加20%浓度的SonoVue,72h后流式细胞仪测瞬时转染率,台盼蓝染色检测细胞活性。 结果单纯超声辐照组转染率为（1.07±0.22）%,加SonoVue组为（12.58±1.75）%（P〈0.05）,各组细胞生存率在95%以上。 结论SonoVue能促进超声辐照基因转染RPE细胞,且对细胞基本无损伤。     

Resolvin D1 Alleviates the Lung Ischemia Reperfusion Injury via Complement,Immunoglobulin, TLR4, and Inflammatory Factors in Rats

Lung ischemia-reperfusion injury (LIRI) is still an unsolved medical issue, which negatively affects the prognosis of many lung diseases. The aim of this study is to determine the effects of RvD1 on LIRI and the potential mechanisms involved. The results revealed that the levels of complement, immunoglobulin, cytokines, sICAM-1, MPO, MDA, CINC-1, MCP-1, ANXA-1, TLR4, NF-κBp65, apoptosis index, and pulmonary permeability index were increased, whereas the levels of SOD, GSH-PX activity, and oxygenation index were decreased in rats with LIRI. Except for ANXA-1, these responses induced by LIRI were significantly inhibited by RvD1 treatment. In addition, LIRI-induced structure damages of lung tissues were also alleviated by RvD1 as shown by H&E staining and transmission electron microscopy. The results suggest that RvD1 may play an important role in protection of LIRI via inhibition of complement, immunoglobulin, and neutrophil activation; down-regulation of TLR4/NF-κB; and the expression of a variety of inflammatory factors.     

乳牙根管系统的形态研究

目的 探讨乳牙根管形态的规律.方法 将一组完整的离体乳牙行透明标本制作后,再应用体视显微镜观察并记录其根管形态及其分类.结果 乳前牙除1颗为单双混合根管外,92%的牙体为单根单管型;上颌乳磨牙的根管形态均为三根管型,下颌乳磨牙的根管形态均为四根管型,并且根管侧枝和管间吻合常见.结论 乳前牙根管形态相对简单,而乳磨牙的...     

磁性附着体焊接式衔铁在下颌全口覆盖义齿中的应用

目的 以铸接式衔铁为对照,探讨焊接式衔铁对下颌全口覆盖义齿口内磁性固位力的影响。方法 以Magfit磁性附着体作为固位装置,对9名采用焊接式衔铁和铸接式衔铁的患者分别进行下颌磁性附着体全口覆盖义齿修复。测定同一患者粘固磁体前、后义齿前部垂直向固位力。结果 两组在粘固磁体后义齿固位力均有明显增加。两组在义齿前部固位力增加值分别为414.7±218.09 g,322.2±318.30 g。结论 在下颌全口覆盖义齿中焊接式衔铁对于提高义齿的固位力具有重要的应用前景。     

骨髓间充质干细胞诱导心脏成纤维细胞向肌纤维母细胞转化:不同时期心肌梗死区域的最佳微环境

背景:骨髓间充质干细胞移植能够有效改善心肌梗死后的心功能,其作用机制可能与移植部位大量肌纤维母细胞的聚集有关,但至今仍缺少证据来证实聚集的肌纤维母细胞足由骨髓间允质干细胞还是由成纤维细胞转化而来?目的:观察不同时期心肌梗死微环境对人鼠骨髓间充质下细胞诱导心脏成纤维细胞向肌纤维母细胞转化的影响.方法:将培养组分为3组:大鼠骨髓间充质干细胞、心脏成纤维细胞单培养组,以及两种细胞共培养组,加入心肌梗死后不同时期心肌匀浆干预7～28 d,并设市不加心肌匀浆的空白对照组,运用免疫细胞化学染色方法,检测不同干预组间平滑肌肌动蛋白(α-SMA)表达及成纤维细胞转化为肌纤维母细胞数量间的差异.结果与结论:加用心肌梗死第14天梗死周边区域心肌匀浆干预的共培养组,检测到心脏成纤维细胞转化为肌纤维母细胞的阳性率最高.提示心肌梗死后微环境下,骨髓间充质干细胞能诱导诱导心脏成纤维细胞转化为肌纤维母细胞,而心肌梗死后14 d的心肌梗死微环境是骨髓间充质干细胞诱导心脏成纤维细胞转化为肌纤维母细胞的最佳微环境.     

基于微量元素支持向量机在鼻咽癌模型预测中的应用

背景:支持向量机目前已经在文本分类、手写识别、图像分类、生物信息学等诸多领域被成功应用.目的:采用智能算法,将支持向量机算法与微量元素数据结合对鼻咽癌患者建模,以提高鼻咽癌识别正确率.方法:基于微量元素数据,利用支持向量机对鼻咽癌患者、正常人、其他疾病患者样本建立分类模型.样品取自观察对象未染发头枕部紧贴头皮3 cm的头发.对样本进行的临床微量元素检测项目为6种元素锌、铜、铁、锰、镉、镍,加上年龄和性别共8项.采用高斯径向基函数为核函数、调节核函数参数C及σ以建立最佳支持向量机模型.结果与结论:采用十折交叉验证法得到模型的识别率分别为81.71%和66.47%.结果表明,基于微量元素的支持向量机法建立的鼻咽癌分类模型能较好的把鼻咽癌样本从正常人、各种疾病患者样本中区分出来.     

肝肾联合移植患者免疫抑制剂的应用

背景:不同单一器官移植后调动机体免疫反应的力度各不相同,故其免疫抑制剂的应用种类及剂量有所差异,多器官联合移植工作中,免疫抑制剂的应用则更为复杂,是移植工作者需要逐步总结的经验之一.目的:探讨肝肾联合移植患者合理的免疫抑制剂应用方案.方法:选择解放军第309医院器官移植中心2002-04/2009-07肝肾联合移植患者10例,以单独肝移植及肾移植患者为对照.3组患者术后早期抗排斥治疗均采用以他克莫司为基础的三联免疫抑制方案,在此方案基础上同时应用巴利昔单抗诱导疗法.肝肾联合移植组和肝移植组患者术中给予甲基泼尼松龙500mg冲击,术后第1天激素用量为160mg,分2次给药,此后每日递减40mg,术后第5天改为20mg泼尼松口服,术后2个月停用激素,术后6个月停用霉酚酸酯,仅应用他克莫司抗排斥治疗;肾移植组术中给予甲基泼尼松龙1000mg冲击,术后前3d应用甲基泼尼松龙500mg,此后每日50mq泼尼松口服,逐渐递减至每日10mg长期维持,术后长期应用他克莫司、霉酚酸酯和糖皮质激素.结果与结论:肝肾联合移植患者术后早期及术后6个月他克莫司用量同肝移植患者相近(P＞0.05),但低于肾移植患者(P＜0.05,P＜0.01):肝肾联合移植和肝移植患者激素和霉酚酸酯用量亦明显低于肾移植患者,并且均在半年内停用激素和霉酚酸酯,肾移植患者需长期应用.3组病例1年后维持用药逐渐体现出个体差异现象.肝肾联合移植组均未出现远期肝功能异常,同时低剂量抗排斥药物对患者免疫系统影响较小,围手术期感染发生率明显减低.说明肝肾联合移植患者免疫抑制剂早期的应用参考单肝移植患者即可达到满意的治疗效果,激素和霉酚酸酯可在6个月内停药,他克莫司用量可低于单肾脏移植患者.     

An Integrated Genetic and Cytogenetic Map of the Cucumber Genome

The Cucurbitaceae includes important crops such as cucumber, melon, watermelon, squash and pumpkin. However, few genetic and genomic resources are available for plant improvement. Some cucurbit species such as cucumber have a narrow genetic base, which impedes construction of saturated molecular linkage maps. We report herein the development of highly polymorphic simple sequence repeat (SSR) markers originated from whole genome shotgun sequencing and the subsequent construction of a high-density genetic linkage map. This map includes 995 SSRs in seven linkage groups which spans in total 573 cM, and defines ~680 recombination breakpoints with an average of 0.58 cM between two markers. These linkage groups were then assigned to seven corresponding chromosomes using fluorescent in situ hybridization (FISH). FISH assays also revealed a chromosomal inversion between Cucumis subspecies [C. sativus var. sativus L. and var. hardwickii (R.) Alef], which resulted in marker clustering on the genetic map. A quarter of the mapped markers showed relatively high polymorphism levels among 11 inbred lines of cucumber. Among the 995 markers, 49%, 26% and 22% were conserved in melon, watermelon and pumpkin, respectively. This map will facilitate whole genome sequencing, positional cloning, and molecular breeding in cucumber, and enable the integration of knowledge of gene and trait in cucurbits.     

Novel double-superior-trunk injury of the brachial plexus: a case report

Brachial plexus injuries are generally rare and a double-superior-trunk injury of the brachial plexus has never been reported before. We report the first case of a brachial plexus injury in a 43-year-old Chinese male with a double superior trunk. This was observed incidentally during an operation 1 month after initial traction injury sustained in a car accident. The double superior trunk of the brachial plexus was formed by the double roots of C5 and C6, respectively. Six months after discharge, the patient reported the recovery of most of the function of his left arm except the muscles innervated by the radial nerve. Two years after discharge, he reported almost full functional recovery of his left arm. We discuss what is known about anatomical variations of the brachial plexus, and the possible association between this novel brachial plexus anatomy and the almost complete functional recovery of the arm.     

DNA结合抑制蛋白-1在结肠癌中的表达及其意义的研究

目的探讨结肠癌中DNA结合抑制蛋白-1（Id—1）的表达与肿瘤细胞分化程度、浸润深度、淋巴结转移及TNM分期的关系。方法用免疫组化方法分别检测17例结肠腺瘤、16例不典型增生、52例结肠癌及J5例癌旁正常纽织中Id—1的表达。结果正常肠粘膜组织中Id-1蛋白偶有表达，在结肠腺瘤、不典型增生、结肠癌组织中的阳性表达率分别为29.4％、43．75％、73．1％，三者比较差别有统计学意义（P〈0．05）。分化程度低的结肠癌组织中Id．1的阳性表达率高于分化程度高者，两者比较差别有统计学意义（P〈0．05）；35例伴有淋巴结转移的肿瘤原发灶者29例（82．9％）表达Id-1，17例无淋巴结转移者9例表达Id-1（52．9％），两者比较有统计学意义（P〈0、05）；随着肿瘤浸润深度的增高、TNM分期的升高，Id-1的表达阳性率逐渐升高，差异有统计学意义（P〈0．05）。Id-1蛋白的表达与结肠癌组织的分化程度、浸润程度、淋巴结转移、TNM分期有关，与年龄无关。结论Id-1蛋白在结肠癌组织中表达明显升高，并与结肠癌侵袭转移及TNM临床分期相关，可作为结肠癌预后判断的指标之一。