肿瘤抗原冲击致敏的IL-2基因修饰的巨噬细胞治疗肾癌的实验研究

目的 :观察体外肿瘤抗原冲击致敏的白细胞介素 2 (IL 2 )基因修饰的巨噬细胞对肾癌小鼠的治疗效果并探讨其相关的免疫机理。方法 :通过重组腺病毒的介导 ,将IL 2基因转入新鲜分离的小鼠腹腔巨噬细胞 ,经肿瘤抗原冲击致敏后回输治疗原位肾癌小鼠 ,采用 4h5 1 Cr释放法检测脾脏NK和CTL活性。结果 :IL 2基因修饰的巨噬细胞经肿瘤抗原冲击后体内回输可使肾癌小鼠肺转移结节明显减少 ,存活期明显延长 ,40 %肾癌小鼠达到长期存活。治疗后荷瘤小鼠脾脏NK和CTL活性显著提高。结论 :IL 2基因修饰的巨噬细胞经肿瘤抗原冲击后自体回输是治疗肾癌的有效方法。     

大鼠延髓内含前-原脑啡肽mRNA、甲硫氨酸-脑啡肽和亮氨酸-脑啡肽神经元的分布

应用原位杂交和免疫组织化学方法,对成年大鼠延髓内含前-原脑啡肽(PPE)mRNA和甲硫氨酸-脑啡肽(M-ENK)与亮氨酸-脑啡肽(L-ENK)免疫反应神经元进行观察。结果表明:含PPEmRNA的神经元胞体,多数分布在孤束核、腹外侧区以及两者之间的网状结构等形成的一条从背内侧到腹外侧区的弧形带内。M-ENK与L-ENK样免疫反应阳性结构(神经元胞体、纤维和终末)也主要密集分布在该带内。本结果对ENK(M-ENK和L-ENK)参与延髓内脏功能活动的调控过程,提供了进一步的形态学证据。     

一种双计算机互联的视觉诱发电位采集系统

本文研制了一种采用二台计算机互联方法实现的诱发电位采集系统，该系统将刺激图形的产生和数据采集分别由两台计算机来完成，通过一些附加的处理保证了模式“给”“撤”光与数据采集的同步，实验结果与目前通用的诱发电位仪的结果基本一致，但比一般的诱发电位仪具有更丰富更灵活的刺激图形方式，本系统为深入研究ＶＥＰ提供了一个价廉、方便、灵活的实验系统。     

医学显微图像分割方法研究进展

医学显微图像分割是医学图像处理中的一个经典难题.针对近年来出现的新方法、新理论,对各种分割方法进行了系统论述,主要包括基于数学形态学方法、神经网络分割、模糊分割、小波分析、遗传算法、统计方法和基于特定模型等方法的图像分割.由于显微图像的复杂性,采用单一方法很难准确分割,故对混合方法也作了一定论述.文中还简要讨论了各种方法的特点和局限性.同时对分割的评价体系也做了简要论述.     

模式翻转视觉诱发电位快速提取的可行性再研究

目的把模式翻转视觉诱发电位快速提取法应用于视神经病变的病人,探讨其临床应用价值。方法应用Galileo视觉诱发电位检测系统对30例正常健康人和17例视神经疾病病人分别进行全视野的PRVEP检测熏每一结果重复检测3次。所得结果应用少次提取法进行处理而得VEP波形。然后将正常对照组3次重复结果两两间分别进行配对t检验,探讨其可重性,并计算出正常值范围,最后参照正常值,分析视神经疾病组的检测结果。结果3次重复结果两两间配对t检验,得P1=0.425>0.05,P2=0.179>0.05,P3=0.110>0.05;参照本研究得出的正常值范围,对病人组的检测结果进行分析,得出这种少次提取法对视神经疾病检测的敏感度90.0%(18/20),特异度92.5%(13/14),准确度91.1%(31/34)。结论用这种少次提取法提取PRVEP,可重性好,稳定可靠。很有临床应用价值。     

大鼠回肠肌间神经丛内一种特殊类型的神经元

实验用乙酰胆碱酯酶和一氧化氮合成酶组织化学方法,对１０只大鼠回肠肌间神经丛进行研究。发现肌间神经丛的一些神经元,沿毛细血管周围分布,有的甚至与毛细血管壁相紧贴,将其称为毛细血管周神经元。这些神经元胞体呈梭形,梨形或多角形,均呈一氧化氮合成酶阳性反应,而乙酰胆碱酯酶反应阴性。这种神经元类似于中枢神经系统的接触脑脊液神经元,它们可能具有神经分泌或感受血液中某些化学成分成分变化之功能。     

Overexpression of decoy receptor 3 in precancerous lesions and adenocarcinoma of the esophagus

Overexpression of decoy receptor (DcR) 3 protein, a recently discovered member of the tumor necrosis factor receptor superfamily, was examined in 40 esophagogastrectomy specimens containing areas of Barrett esophagus (n = 27), low-grade dysplasia (n = 27), high-grade dysplasia or carcinoma in situ (n = 22), and esophageal adenocarcinoma (EAC; n = 28) with immunohistochemical analysis. The results revealed significantly more overexpression of DcR3 in high-grade dysplasia or carcinoma in situ and EAC than in benign esophageal mucosa (both P < .0001), Barrett esophagus (both P < .001), and low-grade dysplasia (P < .01 and P = .033, respectively). Low-grade dysplasia also showed significant overexpression of DcR3 compared with benign esophagus (P < .05) but not with Barrett esophagus (P > .05). DcR3 overexpression seems to negatively correlate with the grade of EAC. Our results suggest that overexpression of DcR3 protein might aid in the diagnosis of high-grade dysplasia or carcinoma in situ and EAC and also might serve as a potential therapeutic target.     

从医硕学位论文引文看馆藏期刊建设与利用

通过对本校73位医硕学位论文的引文量、文献类型、引文语种、引文的出版年代等情况的统计分析，揭示了医硕学位论文引用文献的分布现状，本馆外文期刊对引文情报来源的保障率，馆藏中外文期刊的被引高峰期、引文的年度时限跨度等。获知硕士生对文献的需求、引用文献特点及需改进的问题。为提高研究生的教育和管理；为优化生物医学馆藏期刊建设结构，满足硕士研究生对期刊信息的需求，改进服务质量提出设想和建议。     

Single sperm typing demonstrates that reduced recombination is associated with the production of aneuploid 24,XY human sperm

To account for the increased proportion of paternal nondisjunction in 47,XXY males as compared to other trisomies, it has been suggested that the XY bivalent, with its reduced region of homology, is particularly susceptible to nondisjunction. Molecular studies of liveborn Klinefelter syndrome (47,XXY) individuals have reported an association between the absence of recombination in the pseudoautosomal region and nondisjunction of the XY bivalent. In this study we examined single sperm from a normal 46,XY male to determine if there is any alteration in the recombination frequency of aneuploid disomic 24,XY sperm compared to unisomic sperm (23,X or Y). Two DNA markers STS/STS pseudogene and DXYS15 were typed in sperm from a heterozygous man to determine if recombination had occurred in the pseudoautosomal region. Individual unisomic sperm (23,X or Y) were isolated using a FACStar(Plus) flow cytometer into PCR tubes. To identify disomic 24,XY sperm, 3-colour FISH analysis was performed with probes for chromosomes X,Y and 1. The 24,XY cells were identified using fluorescence microscopy, each disomic sperm was scraped off the slide using a glass needle attached to a micromanipulator and then put into a PCR tube. Hemi-nested PCR analysis of the two markers was performed to determine the frequency of recombination. A total of 329 unisomic sperm and 150 disomic sperm have been typed. The frequency of recombination between the two DNA markers was 38.3% for the unisomic sperm, similar to frequencies previously reported. The 24,XY disomic sperm had an estimated recombination frequency of 25.3%, however, a highly significant decrease compared to the unisomic 23,X or 23,Y sperm (chi(2) = 10.7, P = 0.001). This direct analysis of human sperm indicates that lack of recombination in the pseudoautosomal region is a significant cause of XY nondisjunction and thus Klinefelter syndrome. Copyright Wiley-Liss. Inc.     

不同机制大动脉粥样硬化型脑卒中基线特征和血管内治疗后结局比较

目的 本研究旨在比较颅内大血管伴/不伴同侧颈内动脉闭塞的大动脉粥样硬化型脑卒中患者基线特征以及行血管内治疗后结局的差异。方法 对DIRECT-MT亚组进行回顾性分析,以比较前循环大动脉粥样硬化（large-artery atherosclerosis,LAA）型卒中串联闭塞和颅内闭塞接受血管内治疗（endovascular treatment,EVT）的患者的基线特征和预后,分析不同机制学特征（动脉粥样硬化或动脉-动脉栓塞）对临床结局的影响。结果 LAA型卒中患者共108例,其中串联闭塞63例,颅内闭塞45例。颅内闭塞组患者高血压史率高于串联闭塞组（77.8% vs. 52.4%, P=0.007）。颅内闭塞组闭塞部位最常见于大脑中动脉M1段（88.6%）,而串联闭塞组颅内闭塞主要位于颈内动脉颅内段（49.2%）和大脑中动脉M1段（49.2%）（P＜0.001）。两组患者在年龄、性别、术前抗栓、他汀类药物的使用,卒中、房颤、吸烟史,基线mRS、NIHSS评分,是否静脉溶栓,侧枝循环,以及救治流程时间差异均无统计学意义（P均＞0.05）。90天mRS 0-2分的患者比例两组差异无统计学意义（53.3% vs. 41.9%, P=0.243）。颅内闭塞组术后成功再灌注率高于串联闭塞组（93.3% vs. 77.4%, P=0.026）,但术后24-72小时血管再通的比例前组低于后组（57.1% vs. 77.2%, P=0.034）。最终梗死体积,颅内闭塞组小于串联闭塞组（20.1 vs. 34.5, P=0.025）。术后NIHSS评分,90天EQ-5D-5L评分和BI指数等其他次要结局,两组间差异无统计学意义（P均＞0.05）。两组在90天内的死亡率,发生的无症状性和症状性颅内出血率,5-7天时在另外的血管区域新发脑梗死,以及新流域栓塞的患者百分比相似,差异无统计学意义（P均＞0.05）。结论 动脉粥样硬化导致的串联闭塞相较于孤立颅内闭塞,末次造影成功再灌注率较低,梗死体积更大,但术后24-72小时再通率更高,且神经功能良好预后率以及不良事件发生率均与颅内闭塞相仿。