血友病B基因治疗研究

血友病Ｂ是一种由于人凝血因子Ⅸ (ｈＦＩＸ)缺陷导致的严重出血性遗传疾病 ,临床治疗主要依靠输血或凝血酶原复合物 ,但这些常规的替代治疗不仅费用昂贵 ,易引起输血反应 ,更可能感染肝炎病毒或爱滋病病毒 .理论上 ,只有基因治疗可望从根本上治疗血友病Ｂ .本研究先后建立反转录病毒基因转移系统 ,高效转染小鼠、大鼠、兔和血友病Ｂ患者皮肤成纤维细胞等不同细胞 ,尤其是人ＦＩＸ在骨髓基质细胞的表达在国际同类研究中是首次报道 .人ＦＩＸ在兔体内表达水平和持续时间在同类研究中居世界领先水平 ;在国内首先建立了有关基因治疗的安全性检…     

电击法转移含人凝血因子Ⅸ基因重组质粒的影响因素

反转录病毒载体在基因治疗中可能会产生野生型病毒而引起安全性问题，本文研究含ＦＩＸｃＤＮＡ重组质粒基因治疗血友病Ｂ的可能，构建了不具反转录病毒载体结构的两重组质粒ｐＳＣＩＸＴＮ和ｐＣＩＸＴＮ，前者含ＳＶ４０早期启动子和ｈＣＭＶ启动子共同控制的ＦＩＸ ｃＤＮＡ，后者仅含ｈＣＭＶ启动子控制的ＦＩＸｃＤＮＡ，它们都含有ＴＫ启动子驱动的ｎｅｏ基因，通过电击法将基因转移到ＰＡ３１７和ＨＴ１０８０细胞，在ＨＴ１     

电击法转移含人凝血因子IX基因重组质粒的影响因素

反转录病毒载体在基因治疗中可能会产生野生型病毒颗粒而引起安全性问题，本文研究含ＦＩＸｃＤＮＡ重组质粒基因治疗血友病Ｂ的可能，构建了不具反转录病毒载体结构的两重组质粒ｐＳＣＩＸＴＮ和ｐＣＩＸＴＮ，前者合ＳＶ４０早期启动子和ｈＣＭＶ启动子共同控制的ＦＩＸｃＤＮＡ，后者仅含ｈＣＭＶ启动于控制的ＦＩＸｃＤＮＡ，它们都含有ＴＫ启动于驱动的ｎｅｏ基因，通过电击法将基因转移到ＰＡ３１７和ＨＴ１０８０细胞，在ＨＴ１０８０细胞中的ＦＩＸ表达量分别为２２０、２１２ｎｇ／（１０６细胞·２４ｈ）通过与ｐＣＭＶＩＸ共转染靶细胞，可以增加人ＩＸ因子表达１．５～３．５倍，显示了用质粒载体转染靶细胞在血友病Ｂ基因治疗中是一条潜在可行的途径．本项研究用自制的电击仪转移ＰＡ３１７和ＨＴ１０８０等细胞，最高的转移效率达１０－３，并探讨了细胞种类，ＤＮＡ量，ＤＮＡ结构，电压，脉冲时间与转移效率及表达量的关系．     

相对隶属度,相对Fuzzy集和相关子空间及其性质

建立了相对隶属度、相对Ｆｕｚｚｙ集、相对Ｆｕｚｚｙ点和相关子空间等概念，研究其基本性质，证明了相对Ｆｕｚｚｙ集族ＢＡＩＸ是完全分配格，相关算子ｆ是从ＩＸ到ＢＡＩＸ的满ＧＯＨ，非退化相对Ｆｕｚｚｙ点集ＢＡＭ是ＢＡＩＸ中所有非零∪－既约元之集．得到了子分子格ＢＡＩＸ＊与相关分子格ＢＡＩ＊是代数同构的，广义子空间ＢＡＩＸ＊与相关子空间ＢＡＩＸ是拓扑同胚的等结果     

转基因动物乳腺生物反应器研究

以转基因动物的乳腺组织即乳腺生物反应器生产药用蛋白 ,是近年来生物技术领域发展的重要方向 .利用转基因动物的乳腺组织能够生产出具有完全生物活性的药用蛋白 ,纯化简单 ,投资少 ,成本低 ,对环境没有任何污染 ,可以获得巨额经济效益 .人凝血因子Ⅸ是治疗血友病Ｂ的特异药用蛋白 ,我们和上海市医学遗传学研究所合作 ,在上海市科委资助下 ,开展了ｈＦＩＸ在转基因动物乳腺中特异表达研究 ,构建乳腺特异表达的ｈＦＩＸ载体和表达系统 ,通过显微注射制备乳腺特异表达ＦＩＸ的转基因小鼠和羊 ,在转基因奶山羊中检测到人凝血因子Ⅸ的表达 ;促血…     

四例血友病B患者基因治疗的临床试验

报道了对四例血友病Ｂ患者基因治疗的临床试验，取自四例血友病Ｂ患者的自体皮肤成纤维细胞，通过反转录病毒介导的基因转移，能高效地分泌人凝血因子Ⅸ。用胶原包埋经遗传修饰的自体皮肤成纤维细胞，再移植到血友病Ｂ患者皮下。四例患者经治疗后，自发出血症状得到了减轻，血浆中凝血因子Ⅸ蛋白浓度和凝血活性明显地增加，其中两例患者增加较大，达到正常值的４％￣５％。另外两例患者体内的凝血因子Ⅸ和凝血活性也有不同程度的提高     

MAGNETIC RELAXATION AT EARLY TIMES AND FLUX DIFFUSION BARRIER V（J，B，T） FOR Ti－1223 DOPED WITH Pb AND Ba BY COMPLEX AC SUSCEPTIBILITY MEASUREMENTS

ＭＡＧＮＥＴＩＣＲＥＬＡＸＡＴＩＯＮＡＴＥＡＲＬＹＴＩＭＥＳＡＮＤＦＬＵＸＤＩＦＦＵＳＩＯＮＢＡＲＲＩＥＲＶ（Ｊ，Ｂ，Ｔ）ＦＯＲＴｉ－１２２３ＤＯＰＥＤＷＩＴＨＰｂＡＮＤＢａＢＹＣＯＭＰＬＥＸＡＣＳＵＳＣＥＰＴＩＢＩＬＩＴＹＭＥＡＳＵＲＥＭＥＮＴＳＤ...     

凝血因子Ⅸ基因剔除小鼠遗传稳定性及其临床表型研究

通过对凝血因子Ⅸ基因剔除小鼠遗传稳定性及其相应临床表型的研究,为以该动物模型为研究对象的血友病Ｂ基因治疗提供相应背景资料,遗传分析表明,该小鼠繁殖过程中无回复突变出现,亦未发现Ⅸ因子基因未敲除部分被转录的证据;血浆ＰＴ,ＫＰＴＴ和Ⅸ因子活性检定结果提示该小鼠符合人血友病Ｂ相应临床表征。     

半格上算子的方程描述

文中定义了半格上的算子，给出了半格上算子的几个等价描述，得到如下定理：设（Ｌ，∨）表示Ｌ是一并半格，Ｆ是Ｌ到自身的一个映射，则如下几条等价：（１）Ｆ是Ｌ上的闭包算子；（２）ｘ，ｙ∈Ｌ，ｘ∨Ｆ（Ｆ（ｘ）∨Ｆ（ｙ））＝Ｆ（ｘ∨ｙ）；（３）Ｆ是Ｌ上的闭包算子，且满足Ｆ（Ｆ（ｘ）∨Ｆ（ｙ））＝Ｆ（ｘ∨ｙ）；（４）Ｆ满足：ｘ≤Ｆ（ｘ）且Ｆ（Ｆ（ｘ）∨Ｆ（ｙ））＝Ｆ（ｘ∨ｙ）．另外，还给出拓扑内部算子的方程描述：集Ｘ的幂集Ｓｕ（Ｘ）到自身的映射Ｉ是Ｘ上的一个拓扑内部算子当且仅当方程Ｘ－Ａ∩Ｉ（Ａ）∩Ｉ２（Ｂ）＝Ｉ（Ｘ）－Ｉ（Ａ∩Ｂ）成立     

肌细胞途径血友病B基因治疗的载体优化研究

构建了含有ＭＣＫ增强子,βａｃｔｕｎ启动子,及ｈＦＩＸ内含子１的３个载体Ｇ１ＮａＭＢＡＩＸ,Ｇ１ＮａＭＢＡｉＩＸ,Ｇ１ＮａＰＡＩＸｉ‘ＢＡＭ。转入ＰＡ３１７和成肌细胞Ｃ２Ｃ１２细胞后测定ｈＦＩＸ的表达,发现反向构建的Ｇ１ＮａＰＡＩＸｉ’ＢＡＭ表达最高且最稳定,而正向构建的Ｇ１ＮａＭＢａＩｉｘ的内含子常被剪切,在Ｃ２Ｃ１２细胞中表达不高。     

双抗体夹心ELISA法测定人凝血因子IX蛋白

用双抗体夹心ELISA法测定人凝血因子IX蛋白。在转入了外源人凝血因子IX基因的CHO细胞和HSF细胞的培养液中均测得一定量的IX因子蛋白,其量相当于正常人血浆IX因子蛋白的0.89%～3.81%,而对照细胞均为阴性结果。对一例血友病B患者(IX:C<0.1%)的分析结果表明,其血浆中含有的IX因子蛋白量相当于正常人的52.3%,因而将此病例归属于血友病B~R型。本法灵敏度高、特异性强、重复性好,可与一期法相互补充,应用于临床血友病B的诊断、分类、家系分析及携带者的检出。     

Expression of active human factor IX in transfected cells

Factor IX is the precursor of a serine protease that functions in the intrinsic blood clotting pathway. Deficiencies in this plasma glycoprotein result in haemophilia B (or Christmas disease) and occur in about 1 in 30,000 males. Patients are currently treated with fresh frozen plasma or prothrombin complex concentrates prepared from pooled plasma from normal individuals. There are several problems with this method of treatment, including the probable exposure of the patients to contaminants such as the viral agents responsible for hepatitis and AIDS (acquired immune deficiency syndrome). As a first step towards an alternative source of pure human factor IX, we report here on the use of recombinant DNA techniques to produce biologically active factor IX in cultured mammalian cells. Stable cell lines were produced by cotransfecting a baby hamster kidney (BHK) cell line with a plasmid containing a gene for factor IX and a plasmid containing a selectable marker. Protein secreted by these cell lines reduces the clotting time of plasma from factor IX-deficient patients. We present additional evidence that this protein is authentic human factor IX.     

Expression of active human clotting factor IX from recombinant DNA clones in mammalian cells

Haemophilia B, or Christmas disease, is an inherited X-chromosome-linked bleeding disorder caused by a defect in clotting factor IX and occurs in about 1 in 30,000 males in the United Kingdom. Injection of factor IX concentrate obtained from blood donors allows most patients to be successfully managed. However, because of impurities in the factor IX concentrate presently in use, this treatment involves some risk of infection by blood-borne viruses such as non-A, non-B hepatitis and the virus causing acquired immune deficiency syndrome (AIDS). Because of the recent concern about the increasing incidence of AIDS amongst haemophiliacs, a factor IX preparation derived from a source other than blood is desirable. Here, we report that after introduction of human factor IX DNA clones into a rat hepatoma cell line using recombinant DNA methods, we were able to isolate small amounts of biologically active human factor IX.     

Preparation of rAAV/hFⅨ by HSV/AAV hybrid helper virusand evaluation of its safety

Hemophilia B is a hemorrhagic disease resulting from Factor Ⅸ gene (hFⅨ) mutation as an X-linked recessive inherited trait. The incidence of this disease is 1 in 30000. Clinical treatments depend mainly upon blood transfusions or administration of prothrombin complex so that patients are at the risk of infections with the HIV and hepatitis viruses. Gene therapy offers an attractive alternative in the treatment of hemophilia B by eliminating those risks. In 1991, our lab conducted clinica…     

猴腺病毒Ⅰ型间接免疫荧光检测方法的建立与初步应用*

摘要: 目的建立检测血清中猴腺病毒Ⅰ型( SAdV-1) 抗体的间接免疫荧光方法( IFA) ,为检测实验猴群中SAdV-1 的感染情况提供参考依据。方法用SAdV-1 病毒感染BSC-1 细胞,待50% 细胞出现病变时,用胰蛋白酶消化以 20μL 1 × 107 个/mL 浓度的细胞液滴到24 孔镀膜玻片上,丙酮固定。利用制备的抗原片通过浓度滴定确定猴血清、 羊抗猴二抗最佳工作条件。对IFA 进行特异性、敏感性、重复性验证并初步检测猴血清样本。结果建立了SAdV- 1 抗体的间接免疫荧光检测方法。在采集的21 份猴血清样本中,检出SAdV-1 抗体阳性9 例,12 例血清检测为阴 性。结论方法具有良好的特异性和稳定性,可作为SAdV-1 检测的可靠方法。     

Active gamma-carboxylated human factor IX expressed using recombinant DNA techniques

Factor IX (Christmas factor), a vitamin K-dependent plasma protein made in the liver, functions in the middle phase of the intrinsic pathway of blood coagulation. A functional deficiency of factor IX underlies haemophilia B, a chromosome X-linked recessive disease for which the major therapeutic approach is replacement treatment using factor IX concentrates. The cloning and characterization of the gene for human factor IX would mean that human factor IX could be produced in greater yield and purity through using recombinant DNA techniques. We have now used a human factor IX cDNA clone, inserted into a vaccinia virus-derived vector, to infect human hepatoma cells which normally produce no factor IX, and mouse fibroblasts. Fully active factor IX was produced by the hepatoma cells, whereas the fibroblasts produced a protein less active than natural factor IX, even in the presence of high levels of vitamin K. Human factor IX is extensively post-translationally modified, and thus represents probably the most complex protein produced in active form by recombinant DNA techniques to date. Our study also illustrates the potential of vaccinia virus-based vectors for expressing significant amounts of complex, clinically useful proteins in eukaryotic cells, in addition to its already demonstrated usefulness for producing live recombinant vaccines.     

Preparation of a recombinant adeno-associated viral vector with a mutation of human factor Ⅸ in large scale and its expression in vitro and in vivo

A series of adeno-associated viral vectors containing a mutation of human factor Ⅸ (hFⅨR338A) with different regulation elements were constructed and used to transduce cell lines. The plasmids and the stable transduction cell clones with high expression level of hFⅨR338A were obtained by selecting and optimizing, and then, the recombinant adeno-associated viral vector with hFⅨR338A was prepared via novel rHSV/AAV hybrid virus packaging system on a large scale, which contained the capsid protein genes. A method for producing rAAV-hFⅨR338A viral stocks on a large scale and higher titer was established, which can be used for industrial purpose. The titer of rAAV-hFⅨR338A was more than 1.25×10¹² particle/mL, and then, a mammalian cell line, C2C12 and the factor Ⅸ knock-out mice were transfected with the rAAV-hFⅨR338A in vitro and in vivo. The results show that the high-level expression of rAAV-hFⅨR338A was achieved in cell line and hemophilia B mice. It reached at (2551.32±92.14) ng·(10⁶ cells)^-1·(24 h)^-1 in C2C12 cell in vitro and had a peak concentration of 463.28 ng/mL in mice treated with rAAV-hFⅨR338A, which was as high as the expression of rAAV-hFⅨ-wt (2565.76±64.36) ng·(10⁶ cells)^-1·(24 h)^-1 in C2C12 and 453.92 ng/mL in the mice treated with rAAV-hFⅨ-wt) in vitro and in vivo, there is no any difference between two groups, but the clotting activity of hFⅨR338A is about 2.46 times higher than that of hFⅨ-wt. It was first reported that a mutation of human factor Ⅸ was used into gene therapy research for hemophilia B, meanwhile, a novel packaging system, rAAV/HSV was used for preparation of rAAV-hFⅨR338A on a large scale, which laid the foundation of industrial production for applying rAAV viral stocks to gene therapy clinical trial for hemophilia B mediated with rAAV-hFⅨ.     

用FIX组态软件开发常减压蒸馏装置的SCADA应用

针对用VB编程实现常减压蒸馏装置先进控制及优化控制的应用程序中比较烦琐的SCADA功能,提出了用美国Intellution公司的组态软件FIX来实现相应的SCADA功能,实现了从ORACLE数据库中采集数据的配置方法及步骤,并基于FIX进行二次开发实现软测量和在线优化控制。     

新型蚕蛹虫草对小鼠免疫增强作用的实验研究

目的观察新型蚕蛹虫草对小鼠免疫器官、巨噬细胞吞噬功能及抗体生成的影响.方法采用腹腔巨噬细胞功能测定法和免疫器官重量法及溶血素测定法,观察吞噬百分数、吞噬指数,取脾脏、胸腺称重,计算脾指数、胸腺指数、溶血素的生成.结果新型蚕蛹虫草能显著提高实验动物脾、胸腺的重量,且小鼠的腹腔巨噬细胞(Mφ)数量及吞噬活性明显提高.随着剂量的增加,吞噬百分率、吞噬指数与对照组相比明显增加;并可明显提高小鼠血清溶血素(抗体)的产生水平.结论新型蚕蛹虫草对小鼠免疫器官和网状内皮系统吞噬功能有明显的激活和增强作用;可明显增加B淋巴细胞产生抗体的能力,增加机体的体液免疫功能.     

石松属植物化学成分抗炎活性的筛选

为研究2种石松属植物化学成分的抗炎活性,筛选具有较强抗炎活性的化合物,用LPS诱导RAW264.7细胞建立了体外炎症模型,采用MTT法检测了化合物对小鼠巨噬细胞株RAW264.7细胞增殖的影响.在安全浓度范围内(细胞存活率大于80%)给予药物干预,用Griess法检测了培养上清液中一氧化氮(NO)水平,以各化合物抑制NO释放的能力为筛选指标,评价了化合物的抗炎活性.结果表明:乙酰基二氢石松生物碱(16)、对香豆酸甲酯(21)、豆甾烷-3-酮-21-酸(22)具有较好的NO抑制率,并呈一定剂量依赖关系,提示它们具有一定的抗炎活性.