人胚胎海马发育的形态学研究 Ⅴ.室管膜的发生

运用HE和Nissl染色、免疫组织化学法、透射电镜及扫描电镜，对60例6周至足月的人胚胎海马室管膜上皮变化进行了观察。发现胚胎发育过程中室管膜发生了剧烈变化。最早室管层神经上皮细胞为假复层柱状，随着未分化细胞向外迁徙，海马室管膜层神经上皮细胞迅速增殖，形成复层上皮。当室管膜层细胞停止迁徙时，室管膜开始向假复层柱状及单层柱状上皮转变。电镜观察，胚胎早期神经上皮细胞由未分化细胞构成；其特点是，细胞质内各种特化细胞器匮乏，但糖原丰富。15周左右未分化细胞开始向长突细胞及室管膜细胞分化。长突细胞电子密度高，底部有细长突起，表面有微绒毛，胞质内微丝丰富；而室管膜细胞电子密度低，底部无突起，但表面有丰富的纤毛。对长突细胞及免疫组化染色的GFAP阳性细胞进行形态和发育特征的比较，提示两者属同一类细胞。扫描电镜下，15周前室管膜表面微绒毛较多，以后纤毛逐步发育，大量密集纤毛布满于室管膜表面。此外，还能见到一类接触脑脊液神经元，这类神经元可为多极或双极，并有突起伸入室管膜上皮内。     

乳腺癌和卵巢癌中BRCA基因的突变

一、ＢＲＣＡ1和ＢＲＣＡ2基因1990年Ｈａｌｌ等[1] 发现家族性乳腺癌与 17号染色体长臂上的一个位点有关。随后Ｎａｒｏｄ等[2 ] 也报道了家族性乳腺癌及卵巢癌与 17号染色体有关。 1994年这一基因位点被克隆鉴定 ,命名为ＢＲＣＡ1[3] 。该基因位于染色体 17ｑ2 1,全长10 0ｋｂ ,含 2 4个外显子。蛋白产物的相对分子质量为 2 0 00 0 0 ,含 1863个氨基酸。它可能涉及细胞周期的调控以及ＤＮＡ的修复。在培养细胞中 ,从Ｇ1期到Ｓ期的细胞中 ,ＢＲＣＡ1的表达增加。研究还显示ＢＲＣＡ1在快速增生的细胞中表达最高。缺乏ＢＲＣＡ1活性将使ＤＮ…     

Association of Low Concentrations of Serum Mannose-Binding Protein with Recurrent Infections in Adults

Low concentrations of mannose-binding protein (MBP; also known as mannose-binding lectin) are associated with common opsonic defect in immunodeficient children. We compared the concentrations of MBP in the sera of 47 adults with non-human immunodeficiency virus-related recurrent infections (group I) and 50 healthy adult controls. Mean serum MBP concentrations in the patient group did not differ significantly from those in the control group (P < 0.4). Nevertheless, the proportion of individuals with less than 5 ng of serum MBP per ml was significantly larger in the patient group (21%, P = 0.01) than in the control group (4%). Group II consisted of 73 pediatric and 56 adult patients with recurrent infections. Pediatric patients had significantly lower mean concentrations of serum MBP than their controls (P < 0.005), and there was no significant difference between the concentrations in sera of adult patients and adult controls (P < 0.4). Again, the proportion of individuals with less than 5 ng of serum MBP per ml was significantly larger in both pediatric (22%, P = 0.045) and adult (38%, P = 0.000016) patients than in their respective controls (4%). Our results demonstrate that, as in children, low concentrations of serum MBP can be associated with recurrent infections in adults.     

肝素酶和碱性成纤维细胞生长因子与非小细胞肺癌转移和预后的关系

目的 探讨肝素酶(heparanase)和碱性成纤维细胞生长因子(bFGF)在人非小细胞肺癌(NSCLC)组织中表达的临床意义及其与肺癌转移和预后的关系。方法 采用免疫组织化学、原位杂交和Western blot方法,检测115例人NSCLC石蜡切片和45例新鲜肺癌及对应癌旁正常组织中肝素酶和bFGF的表达情况。采用χ^2检验、t检验、生存曲线和Cox比例风险回归等方法分析肝素酶和bFGF分别表达及共表达的意义。结果 免疫组织化学染色证实肝素酶(91／115)和bFGF(89／115)主要表达在癌细胞质和(或)细胞膜中,在正常肺泡上皮和支气管上皮中则呈阴性表达。Western blot也证实肝素酶在肺癌中的表达明显增高(P=0．041)。统计分析结果显示：肝素酶和bFGF的表达具有明显的一致性(P：0．0001),二者单独表达和共表达均与肺癌的分期、血管侵袭、淋巴结转移、微血管密度和预后有关,其中,二者共表达时与分期和微血管密度的相关性更显著;另外,bFGF还与肺癌的分化程度有关。多因素分析结果显示,肺癌的分化程度、血管浸润、淋巴结转移和bFGF的表达可以作为判断肺癌预后的危险因素,但肝素酶不是影响预后的独立因素。结论 肝素酶和bFGF均与肺癌的转移、血管生成和预后密切相关。     

珊瑚涂层人工骨的制备及溶血实验研究

目的根据生物工程及化工等原理,制备珊瑚人工骨,并检测此珊瑚(Coral)复合人工骨的血液相容性。方法将制备的珊瑚复合人工骨、按照国际标准化组织和我国国家标准规定要求,采用将珊瑚复合人工骨及其浸提液与抗凝稀释兔血直接接触,测定红细胞释放的血红蛋白量(OD值),将测得的OD值换算为溶血率。结果珊瑚复合人工骨材料浸提液组的溶血率为1．81％,材料与血液直接接触组溶血率为1．41％,阴性对照组和阳性对照组溶血率分别为0％、100％。结论珊瑚复合人工骨材料无溶血作用,血液相容性良好。     

SARS疫情期间公众心态影响及变化趋势分析

目的：探索重大突发性公共卫生事件对社会公众心理行为的影响，以及在不同阶段中公众心态变化的特点。方法：对SAILS流行期间374人次的心理咨询记录进行分析，依据疫情发展情况，比较各阶段的差异。结果：在咨询者中，女性(59．4％)多于男性(40．6％)；根据疫情变化将咨询记录数据划分为三个阶段，分析发现随着疫情缓和，针对SARS症状的咨询者显著减少，从13．1％降低到1．8％；有关社会生活的咨询者显著增多，从8．7％上升到12．3％；在有关情绪问题的咨询者中，伴有相关症状者显著减少，从23．0％降低到4．5％；不伴相关症状者显著增多，从77．0％上升到95．5％。结论：整个SAILS疫情期问，情绪问题始终占第一位；随SARS疫情缓和，社会公众对于疾病本身的关注减少，而与疫情有关的社会生活问题增多；面对突发性公共卫生事件，及时开通心理咨询热线电话是十分必要的。     

Building a mouse model hallmarking the congenital human cytomegalovirus infection in central nervous system

To investigate the mechanisms that human cytomegalovirus (HCMV) can vertically transmit from the placenta of mice to infect their offspring in the central nervous system (CNS) and cause congenital anomalies, and in order to provide basic research for preparing HCMV vaccine, we have developed a new type of mouse model of HCMV congenital CNS infection. Pure strain mice were propagated after being infected with HCMV. Then the degree of infection by HCMV to offspring was determined. The experiment shows that in the infection groups the mortality of fetal mice and the fatality of neonatal mice in one week are higher than that of the control groups (P < or = 0.05). At the same time we investigated the CNS of fetus's mice whose mothers were infected by HCMV. Our results showed: 1. The virus was successfully isolated from their cerebral cortex. 2. The signal of HCMV hybridization print was found in their nervous cell through in situ hybridization. 3. Especially human herpes virus-like particles and inclusion bodies in the plasm of nerve cell were found in the tissue of their brain under the electron microscope. This new type of mouse model of HCMV inherent CNS infection will help prepare HCMV vaccine and research HCMV congenital infection in CNS.