表面磁性膜医用316L不锈钢支架的生物相容性

目的 对表面磁性膜血管内支架进行生物相容性研究,为该支架的临床应用提供实验依据.方法 通过溶血实验、动态凝血时间实验、急性全身毒性实验、皮内刺激实验、细胞毒性实验、热源实验、过敏实验、体内植入实验综合评价表面磁性膜血管内支架的生物相容性.结果 表面磁性膜血管内支架无溶血反应及凝血功能的改变,无急性全身毒性反应,无热源反应,支架材料中不存在致敏性物质;支架材料动物体内植入在初期有轻度的炎性反应,12周后炎性反应基本消失,未见炎性细胞浸润积聚现象.结论 表面磁性膜血管内支架具有良好的生物相容性,其应用于临床具有可行性和安全性.     

Effective induction of immune tolerance by portal venous infusion with IL-10 gene-modified immature dendritic cells leading to prolongation of allograft survival

Dendritic cells (DC) not only initiate T cell responses, but are also involved in the induction of tolerance. The functional properties of DC are strictly dependent on their state of maturation. It has been shown that immature DC can induce immune tolerance and prolong allograft survival. Interleukin-10 (IL-10) is an important immunosuppressive cytokine which inhibits maturation and function of DC. In order to improve the tolerogenicity of DC, we and others showed that adenovirus vectors can effectively mediate IL-10 genetic modification of DC, and IL-10 genetic modification can inhibit MHC II, B7.2, and CD40 expression, IL-12 secretion and the T cell stimulatory capacity of DC. The primary aim of this study is to examine the in vivo effects of this approach on allograft survival in a murine cardiac allograft transplantation model. To our surprise, we observed that infusion of immature DC genetically modified to express IL-10 (DC-IL-10) via the tail vein could not prolong allograft survival in the recipients, but shortened their survival. More interestingly, portal venous infusion of DC-IL-10 markedly prolonged allograft survival. The diverse effects of DC-IL-10 infusion through different routes may be due to the different immune responses to alloantigens in recipients that received DC-IL-10 via either the portal or the tail vein. Decreased cytotoxicity, polarization of Th2 response, poor T cell stimulating activity of liver DC and enhanced incidence of donor DC in the recipients may contribute to the more efficient prolongation of allograft survival observed after portal venous infusion of DC-IL-10. These results suggest that portal venous infusion may be an effective approach for immature DC to induce immune tolerance or hyporesponsiveness against donor antigens, and prolong allograft survival.Abbreviations APC Antigen-presenting cells - CTL Cytotoxic T lymphocytes - DC Dendritic cells - DC-IL-10 IL-10 gene-modified immature dendritic cells - iDC Immature dendritic cells - IL-10 Interleukin-10 - MLR Mixed leukocyte reaction - MOI Multiplicity of infection     

男性抢劫罪犯的人格特征及其与父母教养方式的相关性研究

目的：通过对男性抢劫罪犯的人格特征，父母教养方式及二者之间的相关性的分析。探讨早期教育及家庭因素对人格发展的影响，从而为干预和预防犯罪提供依据。方法：使用“艾森克人格问卷”“父母养育方式问卷”对113名男性抢劫罪犯及97名正常男性进行对照分析。结果：EPQ显示抢劫罪犯的精神质与神经均高于对照组，而EMBU显示父母偏爱、拒绝，过度保护、处罚严厉等各因子分均明显高于对照组，而父母的惩罚、严厉、拒绝等与精神质、神经质呈显著负相关。结论，不正确的父母养育方式是人格偏差，以致于从事犯罪的危险因素。     

经皮穿刺神经末梢冷冻治疗跟痛的应用解剖

为给神经末梢冷冻治疗跟痛提供穿刺定位依据,在52侧下肢中对跟内侧支和跟外侧支的体表投影进行了观测。跟内侧支约有69.8%通过内踝跟结节线的中份,另有28.3%跟内侧支起于该线中份下方距离7.3mm处;跟外侧支约有70.2%通过外踝跟结节线的中份,另有22.8%跟外侧支起于该线下方距离5.8mm 处。据此冷冻治疗跟痛的进针部位可以选在内、外踝与跟结节连线的中份下方垂直距离5mm 处。     

G-CSF对外周血树突状细胞亚群比例的影响

目的 :了解G CSF对小鼠外周血树突状细胞 (DC)亚群比例的影响。方法 :以不同剂量 (0、5 .0、10 .0或 15 .0 μg)的G CSF ,分别皮下注射于BALB/c小鼠 ,连续 6d ,每天 1次。第 6天分离外周血DC ,用流式细胞仪检测DC1(CD11c+ CD8a-)和DC2 (CD11c+ CD8a+ )的比例并计算其绝对值。结果 :经不同剂量的G CSF刺激后 ,外周血DC1的绝对值无显著变化 ,而DC2的绝对值增加 5倍 (9.6× 10 6/Lvs 5 5 .1× 10 6/L ,P <0 .0 1) ,DC1/DC2比值降低 (4.2vs 0 .7,P <0 .0 1)。结论 :G CSF在体内可提高外周血DC2的绝对数 ,对DC1的数无明显影响 ,从而使DC1/DC2的比例倒置     

膨胀型肝癌光镜,电镜和免疫组化观察

对３０例膨胀型肝癌和２０例浸润型肝癌作病理组织学分析，并对２０例膨胀型和浸润型肝癌进行超微结构和免疫组化研究。结果显示，膨胀型肝癌的生物学特性和浸润型肝癌显著不同。膨胀型肝癌癌组织分化较好、侵袭性较小、增殖程度较低、癌巢周围基膜发育良好、瘤结节周围均有包膜而呈膨胀性生长，但包膜内浸润的微癌灶十分常见，多达７０％。提示此型有潜在的较强侵袭性和向浸润型肝癌转化的倾向。     

中草药叶下珠不同品种和制剂体外抗乙型肝炎病毒的…

以２．２．１５细胞为模型，对不同品种，剂型和添加成份的叶下珠提取物进行了体外抗乙型肝炎病毒（ＨＢＶ）活性的研究。结果显示，七种受试药物体外均有不同程度的抗ＨＢＶ活性。其中以沱茶珍珠草、胶囊１号作用最明显，在浓度为５００ｍｇ／Ｌ时对ＨＢｓＡｇ的抑制率可达１００％，而未显示出明显的细胞毒性，Ｓｏｕｔｈｅｒｎ印迹杂交显示，胶囊１号对细胞内外ＨＢＶＤＮＡ的抑制呈剂量依赖型。还观察到，药物对病毒颗粒产一的抑     

大鼠肺表面活性物质磷脂在急性肺泡损伤时的变化

以6mg/kg体重皮下注射N-亚硝基-N-氨基甲酸乙酯诱发大鼠急性肺泡损伤,在注射后第2天,肺泡灌洗液(即肺泡空间成份)表面活性物质磷脂含量明显减少,而蛋白质含量明显增加。细胞内层状体和微粒体中磷脂及蛋白质含量未见明显改变。与此同时,各肺成份中磷脂的组成也发生了变化,即PG/PI的比率明显降低。分子种的检测显示,两种酸性磷脂(Po和PI)的分子种构成不同,其主要分子种在急性肺泡损伤时有所改变。     

血管内皮生长因子反义基因转染对高转移人巨细胞肺癌细胞系生 …

目的 探讨反义血管内皮生长因子（ＶＥＧＦ）基因转染在抑制恶性肿瘤生长和转移的抗肿瘤血管基因治疗中的意义。方法 利用基因重组技术构建正义和反义ＶＥＧＦ１２１ ｃＤＮＡ真核表达载体,用脂质体法转染高转移性人巨细胞肺癌细胞（ＰＧ）,经Ｎｏｒｔｈｅｍ杂交和Ｗｅｓｔｅｒｎ印迹免疫化学检测ＶＥＧＦ ｍＲＮＡ和蛋白质的表达水平,并对转染前后细胞进行体外生长和裸鼠体内生长转移等多项生物学行为实验,结果 转染反义转     

Epitope-specific impairment of production of antibody against merozoite surface glycoprotein 1 of Plasmodium falciparum in symptomatic patients with malaria

We analyzed the relationships between levels of antibody specific for merozoite surface glycoprotein-1 (MSP1) of Plasmodium falciparum and clinical manifestations in humans. We prepared recombinant MSP1 proteins representing block 3 (M3), block 6 (M6), blocks 1–6 (M1/6), and block 17. When we divided the slide-positive individuals in Guadalcanal into symptomatic and asymptomatic groups, the former group showed lower IgG levels against M6 and block 17, but not against M3, than did the asymptomatic group (P < 0.01). The possibility of nonspecific suppression was unlikely, given that the levels of antibody against poliomyelitis virus observed in the two groups were almost the same. Among the IgG subclasses tested, production of cytophilic IgG₃ seemed to be dominant. When we analyzed epitopes recognized by antibodies against block 17, a peptide (SSSNFLGIS) was preferentially recognized by sera from asymptomatic individuals. These results suggest that clinical symptoms occurring during falciparum malaria seem to be associated with the development of levels of antibody against particular epitopes on MSP1, which is under the control of an immunoregulatory mechanism. Received: 1 October 1999 / Accepted: 21 October 1999