绿脓杆菌MSHA菌毛株菌苗与白血病免疫应答反应

绿脓杆菌(MSHA)菌苗是一种具有广谱抗感染效果的免疫调节剂。我们观察了20例白血病患者多次疫苗主动免疫的免疫应答反应,14例病人血中广谱抗体效价升高,临床上有很好的治疗反应,6例抗体效价无变化,而临床症状加重,最后均死于败血症。上述结果提示白血病病人对疫苗的免疫应答反应,在白血病缓解中起着重要作用,对临床早期准确判断白血病患者的预后很有意义。     

复方716合剂治疗上呼吸道感染的研究

复方７１６合剂由白花蛇舌草，乌蕨、地锦草、铁苋等中草药组成。为了观察７１６合剂治疗上呼吸道感染的疗效，我们将１５０例上呼吸道病毒感染阳性的患儿随机分为７１６治疗组（８９例）及西药对照组（６１例）进行临床观察，治疗组有效率达９２％，对照组有效率达６７％。实验研究亦证明７１６合剂对细胞的毒性很小，对鸡胚亦无明显毒性，并有显著抑制甲型流感病毒的作用。     

免疫阻断乙型肝炎病毒宫内感染失败的研究现状

主动与被动联合免疫阻断HBV母婴传播效果很好,但仍有少数HBsAg阳性,尤其是HBeAg也阳性的母亲所生婴儿可感染HBV,主要原因是宫内感染.此文就HBV宫内感染的途径、免疫阻断失败的因素及相关策略予以分析.     

变形链球菌表面蛋白和葡糖基转移酶基因疫苗对唾液变形链球菌和牙菌斑的影响

目的　了解变形链球菌表面蛋白和葡糖基转移酶基因疫苗单独及联合免疫对定菌鼠唾液变链菌和牙面菌斑的影响。方法　 2 8d龄 Wistar大鼠 3 6只 ,随机分为 pc DNA3 - pac组、pc DNA3 - gtf B组、pc DNA3 - pac联合pc DNA 3 - gtf B组、变形链球菌灭活全菌组、pc DNA3空载体组和 PBS液组 ,进行三次双侧颌下腺腺周注射免疫 ,建立定菌鼠模型 ,作诱龋实验 3个月。唾液变链菌计数和菌斑计分。结果　唾液变链菌菌落计数和牙面菌斑计分在 pc D-NA3与 PBS组最高 ,其次为单基因疫苗免疫组 ,联合基因疫苗和灭活全菌细胞免疫组最低 ,各组间有显著性差异 ( P<0 .0 5 )。结论　 pc DNA3 - gtf B和 pc DNA3 - pac具有明显的免疫抑菌作用 ,联合基因疫苗免疫优于单基因疫苗     

An adenovirus type 5 (AdV5) vector encoding an envelope domain III-based tetravalent antigen elicits immune responses against all four dengue viruses in the presence of prior AdV5 immunity

Dengue is a mosquito-borne viral disease caused by four antigenically distinct serotypes of dengue viruses (DENVs). This disease, which is prevalent in over a hundred tropical and sub-tropical countries of the world, represents a significant global public health problem. A tetravalent dengue vaccine capable of protecting against all four DENV serotypes has been elusive so far. Current efforts are focused on producing a tetravalent vaccine by mixing four monovalent vaccine components. In this work, we have utilized a discrete carboxy-terminal region of the major DENV envelope (E) protein, known as domain III (EDIII), which mediates virus entry into target cells and contains multiple serotype-specific neutralizing epitopes, to create a chimeric tetravalent antigen. This antigen derived by in-frame fusion of the EDIII-encoding sequences of the four DENV serotypes was expressed using a replication-defective recombinant human adenovirus type 5 (rAdV5) vaccine vector. This rAdV5 vector induced cell-mediated immune responses and virus-neutralizing antibodies specific to each of the four DENVs in mice. Interestingly, anti-AdV5 antibodies did not suppress the induction of DENV-specific neutralizing antibodies. We observed that anti-AdV5 antibodies in the sera of immunized mice could promote uptake of a rAdV5-derived reporter vector into U937 cells, suggesting that pre-existing immunity to AdV5 may in fact facilitate the uptake of rAdV5 vectored vaccines into antigen presenting cells. This work presents an alternative approach to developing a single component tetravalent vaccine that bypasses the complexities inherent in the currently adopted four-in-one physical mixture approach.     

Infection dynamics and virus-induced apoptosis in cell culture-based influenza vaccine production—Flow cytometry and mathematical modeling

Cell culture-based influenza vaccine manufacturing is of growing importance. Depending on virus strains, differences in infection dynamics, virus-induced apoptosis, cell lysis and virus yields are observed. Comparatively little is known concerning details of virus–host cell interaction on a cellular level and virus spreading in a population of cells in bioreactors. In this study, the infection of MDCK cells with different influenza A virus strains in lab-scale microcarrier culture was investigated by flow cytometry. Together with the infection status of cells, virus-induced apoptosis was monitored. A mathematical model has been formulated to describe changes in the concentration of uninfected and infected adherent cells, dynamics of virus particle release (infectious virions, hemagglutinin content), and the time course of the percentage composition of the cell population.     

抗血管生成肿瘤疫苗研究进展

研究发现,肿瘤的生长和转移依赖于血管的生成,如果抑制肿瘤新生血管的形成就可以有效抑制肿瘤细胞的生长和转移.越来越多的证据表明,以血管相关抗原为靶点的疫苗可以引发机体产生特异性细胞或体液免疫反应,抑制血管的形成,从而起到阻止肿瘤细胞生长和转移的作用.目前,针对肿瘤血管生成的疫苗治疗已成为肿瘤研究的热点及肿瘤治疗的新策略.本文就目前所进行的抗肿瘤血管生成的疫苗研究情况作一综述.     

前列腺癌组织中树突状细胞的变化及以此为基础的免疫治疗

树突状细胞(DC)作为功能最为强大的抗原呈递细胞,对肿瘤免疫起着关键的启动作用。前列腺癌细胞通过一系列复杂的作用使肿瘤免疫微环境中DC的数目和功能发生变化,从而逃逸机体的免疫监视,形成了肿瘤的发生、发展。认识到这一点,人们开展以DC为基础的前列腺癌的免疫疫苗治疗,并取得了一定的效果。而前列腺癌免疫微环境中DC的变化和以此为基础的免疫治疗仍处于起步阶段。     

流感病毒RNA聚合酶PB1-1亚基片段的克隆及表达

目的 将流感病毒RNA聚合酶PB1-1亚基进行亚克隆、表达，获得重组的亚克隆多肽，为进一步研究PBl亚基功能奠定基础。方法 以FB1亚基cDNA为模板，用PCR方法扩增出PB1-1片段，应用定向克隆策略将扩增后片段与高效表达载体pQE30重组，阳性克隆重组质粒经酶切及测序鉴定，IPTG诱导各亚克隆系高效表达；优化表达条件。结果 PCR法扩增出487bp的片段，酶切及测序鉴定获得正确的重组质粒，在E．coli M15中表达得到相对分子量约为20KD的重组蛋白，获得蚕组多肽。结论 成功地亚克降及表达了流感病毒RNA聚合酶PB1-1亚基。