Construction and anti-tumor effects of recombinant fowlpox virus expressing Newcastle disease virus hemagglutinin-neuramidinase gene

Hemagglutinin-neuramidinase (HN), a Newcastle disease virus-derived protein, not only mediates receptor recognition but also possesses neuraminidase (NA) activity, the ability to cleave a component of those receptors, N-acetylneuraminic acid (NAcneu, sialic acid). It is known that this protein in mammalian species, including human beings, has interesting anti-neoplastic as well as immune stimulating properties. To explore the use of the HN gene in cancer gene therapy, we constructed a recombi-nant fowlpox virus expressing the HN protein (vFV-HN) and compared the anti-tumor activity of the recombinant virus with that of wild-type fowlpox virus (FPV) in vivo and in vitro. Here we found that although B16 cells were somewhat resistant to the basal cytotoxic effect of wild-type fowlpox virus, infection with vFV-HN caused a pronounced cytotoxic effect and, the survival of tumor-bearing mice immunized with vFV-HN was significantly increased compared with the survival of mice immunized with the FPV alone. Furthermore, the immunization of mice with vFV-HN elicited a B16 tumor-specific cytotoxic T lymphocyte (CTL) response and clonal expansion of both CD4 and CD8 T cell populations in vivo. In addition, T cells from lymph nodes of mice vaccinated with vFV-HN secreted high levels of the Th1 cytokine IL-2 and IFN-γ, indicating that the regression of tumor cells is related to a Th1-type dominant immune response. These results demonstrate that vaccination with vFV-HN may be a potential strategy for cancer gene therapy.     

计算机病毒及防治研究

随着计算机技术和计算机网络的发展,计算机病毒迅速蔓延。使计算机用户的数据安全受到严重威胁。通过对计算机病毒破坏性、传染性及不可预见性等特征的研究,按照病毒的不同分类分别对其工作原理进行了分析,并探讨了一些清除计算机病毒的方法。     

可降解Hr-BMP复合胶原膜修复腭部骨缺损的实验研究

目的：观察腭部扁平骨引导性骨再生现象（GBR），探讨利用GBR修复腭裂骨缺损的可能性。方法：建立幼犬腭部骨缺损实验动物模型，应用常规组织学检查术、免疫荧光显微法、X线及扫描电子显微术在实验过程的不同阶段进行观察研究。结果：1）借助复合人重组骨形成蛋白（Hr-BMP）胶原膜GBR，腭部骨缺损可以完全修复；2）胶原膜可提供成骨所需的密闭空间；3）复合Hr-BMP胶原膜具有良好的组织相容性和安全性；4）复合Hr-BMP胶原膜GBR所致骨形成的量及速度均高于其它对照。结论：1）复合Hr-BMP胶原GBR具有确实有效的骨引导和骨诱导性，在骨缺损修复的早期阶段即可产生大量的新骨；2）复合Hr-BMP胶原膜植入后4周内的成骨活动最活跃，胶原膜和复合Hr-BMP胶原膜在其降解吸收过程中，不干扰后续的成骨活动；3）仍有必要构建具有适合的吸收降 解性和一定力学强度的隔膜材料。     

利用转基因毕赤酵母高表达小分子药用多肽的研究

天然小肽Gsp有明显的降血糖功效,由59个氨基酸残基组成.其编码基因由本实验室设计、合成,并重组构建成表达质粒pPIC9-Gsp. 经电穿孔将该质粒转化为毕赤酵母GS115(His4- mut+),挑选His+ muts型菌株进行重组蛋白胞外表达研究.表达蛋白经Tricine-SDS-PAGE凝胶电泳分析确定了相对分子质量的正确性,其氨基酸测序显示与天然多肽序列一致,并经紫外扫描分析确定了表达量为344mg/L左右.     

温室效应与天花病毒复苏

工业革命以来,大气二氧化碳浓度持续增高,温室效应进一步加强,导致全球变暖.全球变暖导致冰川融化,埋藏在冰川内的病毒有可能复苏,引起大规模的疫病.本文介绍了天花的危害以及绝灭,以天花病毒为例讨论了温室效应与已经绝灭的病毒之间的关系.     

Candidate Multi-Peptide-Vaccine Against Classical Swine Fever Virus Induces Strong Antibody Response with Predefined Specificity

IntroductionClassical swine fever virus(CSFV) is a pestiviruswhich causes significantmortality and morbidity inpigs.An epidemic of CSFV in a high pig densityarea can result in devastating financial losses,because few infected pigs can be effectively cured.In many countries in Europe and Asia,classicalswine fever (CSF) is controlled by vaccinationwith commercially available vaccine strains,suchas the Chinese vaccine strain(C-strain,i.e.,hogcholera lapinized virus) orsome modified-live vir…     

单克隆抗体亲和层析纯化基因工程人γ-干扰素研究

用抗基因工程人γ－干扰素单克隆抗体（２Ａ１２）细胞株亲和层析从表达人γ－干扰素的大肠杆菌抽提液中纯化经稀释复性后的γ－干扰素。一步纯化后的γ－干扰素含量达９５％以上，蛋白质的比活性达 １．２×１０ｕ／ｇ，收率为７８％。洗脱液用 ０．５ｍｏｌ／ＬＮａＣＩ的 ＰＢＳ溶液，洗脱率达９２．８％。     

大袋蛾核型多角体病毒,病状及毒力的生物测定

报道了对大袋蛾核型多角体病毒、病状的观察。林间因感染大袋蛾核型多角体病毒而死亡的幼虫可分为两类：一类为纯病毒感染，另一类为病毒和细菌混合染。用不同浓度的大袋蛾核型多角体病毒感染大袋蛾卵，得多角体浓度与死亡率的直线回归方程：ｙ＝０．７８＋０．８２３ｘ，ＬＣ５０为１．１８×１０＾５ＰＩＢ／ｍＬ。用１０＾５，５×１０＾５，１０＾６ ＰＩＢ／ｍＬ感染卵，得感染时间与死亡率的关系和ＬＴ５０，分别为：ｙ＝６．     

微机病毒与防范技术

本文阐述了计算机病毒的原理,综述了传统的计算机病毒防护方法,同时介绍了一些新的防护理论及方法.