您现在的位置: 首页> 研究主题> 霍乱毒素

霍乱毒素

霍乱毒素的相关文献在1985年到2021年内共计218篇,主要集中在基础医学、内科学、药学 等领域,其中期刊论文170篇、会议论文8篇、专利文献9124篇;相关期刊102种,包括生物技术通报、生物技术通讯、国际生物制品学杂志等; 相关会议8种,包括第二届北京热带医学与寄生虫学论坛、2010年中国药学大会暨第十届中国药师周大会、中国畜牧兽医学会动物传染病学分会第十三次学术研讨会等;霍乱毒素的相关文献由472位作者贡献,包括马清钧、李海标、曹诚等。

霍乱毒素—发文量

期刊论文>

论文:170 占比:1.83%

会议论文>

论文:8 占比:0.09%

专利文献>

论文:9124 占比:98.09%

总计:9302篇

霍乱毒素—发文趋势图

霍乱毒素

-研究学者

  • 马清钧
  • 李海标
  • 曹诚
  • 李平
  • 石成华
  • 孟晓丽
  • 殷国荣
  • 刘延清
  • 刘红丽
  • 古钦民
  • 期刊论文
  • 会议论文
  • 专利文献

搜索

排序:

年份

    • 尹萌; 陈焕鹏; 李永超; 郭荣平; 林小军; 刘忠华; 余波澜; 黄朝峰; 赵擎宇
    • 摘要: 目的:利用肝癌组织进行体外的三维(three-dimension,3D)组织块培养,通过添加PD98059和霍乱毒素(cholera toxin,CT)优化培养条件,建立一种高活性的肝癌组织体外培养模型.方法:收集中山大学肿瘤防治中心肝胆科的肝癌组织标本,经清洗、冻存、复苏等处理后分为对照组、PD组、CT组、PD+CT组,同时进行体外的二维(two-dimension,2D)和三维培养.各组组织采用DNA断裂的原位末端标记法(TUNEL)检测组织细胞凋亡情况,qRT-PCR检测BCL-2、BID、Caspase 3、Cyclin D1、CDK2、ELK-1、C-FOS、C-MYC、C-JUN等相关基因的mRNA表达水平,免疫荧光染色检测BCL-2和cleaved caspase-3蛋白表达情况,筛选并确定最优的体外培养方法.结果:3D培养组的组织细胞凋亡均少于2D培养组;PD98059通过上调BCL-2蛋白的表达,下调cleaved caspase-3蛋白的表达,激活MEK/ERK下游基因,从而减少体外培养的组织细胞凋亡,增强其抗凋亡能力;霍乱毒素通过上调Cyclin D1、CDK2的基因表达,促进其增殖.结论:我们开发了一种新型肝癌组织的体外三维培养模型,它可以作为进一步的药物试验和人源性异种移植(PDX)模型的工具.
    • 吴家媛; 刘建国; 马欣荣; 洪献忠; 吴志刚; 张剑; 梁文红
    • 摘要: 目的:经农杆菌介导将变异链球菌表面蛋白A区与霍乱毒素B亚单位嵌合基因导入黄瓜,获得转基因黄瓜植株,为转基因可食防龋疫苗的研究提供实验基础。方法:利用双元载体pCAMBIA2301构建变异链球菌表面蛋白A区与霍乱毒素B亚单位嵌合质粒(PAcA-ctxB)的植物表达载体p2355-PAcA-CTB;电转化法导入农杆菌EHA105;采用叶盘转化法转化黄瓜,转基因植物经过卡那霉素抗性筛选、GUS基因染色、PCR及Southern blot杂交分析检测目的基因鉴定。结果:成功得到转基因黄瓜植株,卡那霉素抗性筛选、GUS基因染色、PCR及Southern blot杂交分析检测证实目的基因PAcA-ctxB已整合至黄瓜基因组中。结论:获得了含有变异链球菌表面蛋白A区与霍乱毒素B亚单位嵌合基因的转基因黄瓜植株,为转基因可食防龋疫苗的进一步研究提供了实验基础。
    • 贾岚; 洪艳
    • 摘要: 霍乱肠毒素(CT)是霍乱弧菌重要的毒力因子,内含A和B两个亚单位.A亚单位(CTA)为毒性亚基,B亚单位(CTB)不具毒性.CTB因其独特的生理功能已成为重要的佐剂之一,近年来备受各国学者重视.深入探究CTB的免疫调节机制有助于更好地设计疫苗并优化其效果,此文将对CTB作为免疫佐剂在疫苗研究中的进展进行综述.%Cholera toxin (CT) is the important virulence factor of Vibrio cholerae which is composed of A and B subunits.Cholera toxin A subunit (CTA) is toxic,while B subunit (CTB) is nontoxic and has become one of the important adjuvants and been paid much attention by scholars in recent years because of its unique physiological function.Better understanding of immunomodulatory mechanism of CTB would be helpful to develop and improve novel vaccines.This paper discusses the latest progress of CTB as immune adjuvant in vaccine research.
    • 李杰; 阚飙; 张京云
    • 摘要: Objective To establish a triplex TaqMan real-time PCR system containing internal amplification control(IAC)to detect cholera toxin gene ctxA and enterotoxigenic Escherichia coli(ETEC)heat-labile enterotoxin gene elt. Methods Primers and probes were designed based on the sequences of ctxA,elt and IAC. Both sensitivity and specificity were analyzed and interactions between different reactions were evaluated. Results This system showed that the sensitivity of ctxA was 94 copies/reaction while the elt 79 copies/reaction and the amplification efficiency were 94.7%and 98.1%,respectively. Under the ratio of copy numbers on gene ctxA to elt as between 1∶1-1∶10, when both targets were detected,with impact was less on each other. However,when the amount of elt or ctxA was 100 times of IAC,the amplification of IAC was significantly inhibited. Conclusion This system showed both satisfactory sensitivity and specificity, thus could be used to detect pathogenic bacteria in diarrhea stools. The detection of IAC could prompt the presence of PCR inhibitors in samples being tested.%目的:建立一个含扩增内对照(IAC)的三重TaqMan real-time PCR体系,以检测霍乱毒素基因ctxA和肠产毒性大肠埃希菌的不耐热肠毒素基因elt。方法针对ctxA、elt和IAC设计引物和探针,进行灵敏性和特异性分析,评价三重反应之间的互相影响。结果该检测体系灵敏度为ctxA每个反应94拷贝,elt每个反应79拷贝,扩增效率分别为94.7%与98.1%。ctxA与elt拷贝数比例为1∶1~1∶10时,二者均能良好扩增;elt或ctxA的量是IAC的100倍以上时,IAC扩增受到抑制。结论该检测体系具有良好的灵敏性和特异性,可以用于腹泻粪便中感染病原菌的检测,其中内对照检测可以提示粪便样本中是否存在PCR抑制因子。
    • 黄田喜; 朱燃; 赵雪梅; 梁平
    • 摘要: 目的 探讨黏膜佐剂霍乱毒素B亚单位(CB)对β淀粉样多肽(Aβ)抗原效应的增强作用及对脑中Aβ斑块形成的抑制作用.方法 选取转基因阳性痴呆模型鼠24只,至7月龄时,随机分为Aβ+CB组、Aβ+铝佐剂(AL)组、单Aβ抗原组、阳性对照组,每组6只,另6只转基因阴性鼠作为阴性对照组.鼻腔滴入佐剂,1次/周,持续 5个月,间接ELISA法测血清抗体效价,Morris水迷宫实验测小鼠的行为学能力,双抗夹心ELISA法测脑中Aβ含量,免疫组织化学染色观察脑中Aβ斑块形成.结果 免疫5个月后,Aβ+CB组抗体效价最高,为1:4000,Aβ+AL组为1:2000.与阳性对照组比较,Aβ+CB组寻找隐性平台时间缩短约50%(P0.05);Aβ+CB组脑中Aβ含量明显减少(P0 05);Aβ+CB组海马区、皮质区Aβ斑块分别减少56.4%、45.6%(P0.05).结论 黏膜佐剂CB增强Aβ抗原的效应、抑制痴呆鼠脑中Aβ斑块形成,改善小鼠学习记忆能力的作用较LA更明显.
    • 张玲; 肖昕; 杨旺; 代淑兰; 胡春华; 廖芳
    • 摘要: Objective To construct a eukaryotic vector which contains avian H5N1 influenza virus hemagglutinin (HA) antigen and the cholera toxin B subunit (CTB) and to investigate its expression in COS7 cells,and the ability to induce specific immune responses in vivo in different periods.Methods After cloned by polymerase chain reaction (PCR),CTB and HA genes were digested with BamH Ⅰ and connected into CTB-HA gene with T4 ligase.The connected gene was referred to as CH.After double digestion,CH gene was inserted into a eukaryotic recombinant plasmid pCI-neo.The pCI-CH plasmid was then transfected into COS7 cells.Western blot was used to detect the expression of HA antigen.After New Zealand white rabbits were immunized,the titer of HA antigen-specific antibody in serum and its specificity with other strains such as H1N1,H9N1,H3N2 and influenza B virus were determined by indirect enzyme-linked immunosorbent assay.Results The pCI-CH vector (DNA vaccine) was successfully constructed,which could be efficiently expressed in COS7 cells and induce specific antibodies against pCI-CH in rabbits.Cross reactions indicated that DNA vaccine pCI-CH specific antisera could not only react with H5N1 strain (P/N>2.1),but also H1N1,H9N1 and H3N2 strains,but did not cross react with influenza B virus.Conclusion The newly constructed avian H5N1 influenza virus nucleic acid vaccine has good immunogenicity.%目的 构建甲型H5N1禽流行性感冒流感病毒血凝素(HA)抗原和霍乱毒素B亚单位(CTB)融合蛋白真核表达载体,并研究其在COS7细胞中的表达特性,及其在动物体内不同时间点诱导机体产生特异性抗体的情况.方法 采用PCR技术分别克隆CTB基因和HA基因,并用BamH Ⅰ酶切2个基因片段,在T4连接酶的作用下构建CT-HA融合基因(CH基因).双酶切后,将CH基因插入真核表达质粒pCI-neo中,构建甲型H5N1禽流感病毒融合蛋白真核表达载体(pCI-CH).将pCI-CH质粒转染COS7细胞,利用Western印迹、十二烷基硫酸钠聚丙烯酰胺凝胶电泳(SDS-PAGE)检测HA抗原的表达;间接ELISA法检测免疫接种新西兰大白兔后其血清中HA抗原的特异性抗体效价,以及与H1N1、H9N1、H3N2和乙型流感病毒的交叉反应情况.结果 pCI-CH真核表达载体(即核酸疫苗)构建成功,可在COS7细胞中高效表达,并能在大白兔体内诱导产生特异性抗pCI-CH抗体.核酸疫苗pCI-CH特异性抗血清不仅可以与甲型H5N1流感病毒特异性结合(P/N>2.1),而且可以与H1N1、H9N1和H3N2毒株发生特异性反应;但该抗血清与乙型流感病毒无特异性反应.结论 构建的甲型H5N1禽流感病毒核酸疫苗具有良好的免疫原性.
    • 毕莹; 赵欣欣; 张宁; 王宗谦
    • 摘要: Objective To investigate oral collagen type Ⅱ peptide-cholera toxin B subunit-liposome complex induce tolerance to collagen-induced arthritis (CIA).Methods DBA/1 mice were divided into four groups,group Ⅰ:normal control,group Ⅱ:CIA control,group Ⅲ:oral collagen type Ⅱ peptidecholera toxin B subunit-liposome complex,and group Ⅳ:for testing IgG2a (on day 14 after primary immunization).Arthritis scores and histopathologic assessment were analyzed.The levels of serum IgG2a were examined by ELISA.Results There was no arthritis development in group Ⅰ.The incidence of arthritis in group Ⅱ was higher than that in group Ⅲ ( 100% vs 28.6%,P<0.05).The arthritis score in group Ⅱ was higher than that in group Ⅲ (5.40 vs 0.4,3,P<0.01).Histopathologic score was higher in group Ⅱ than that in group Ⅲ (16.00 vs 2.85,p<0.05).Level of serum IgG2a of group Ⅰ was very 1ow(38 ng/ml).Mice of group Ⅱ produced significantly higher level of IgG2a than mice of group Ⅲ (3922 ng/ml vs 3219ng/ml,P<0.05).IgG2a of group Ⅳ was 98 ng/ml which was significantly higher than that of group Ⅰ (P<0.01 ).Conclusion Oral collagen type Ⅱ peptide-cholera toxin B subunit-liposome complex could inhibit CIA progression through immune tolerance.%目的 观察口服Ⅱ型胶原肽-霍乱毒素B亚单位-脂质体复合物对免疫耐受的诱导作用.方法 DBA/1小鼠分组,Ⅰ组:正常对照组,Ⅱ组:胶原诱导关节炎对照组,Ⅲ组:口服Ⅱ型胶原肽-霍乱毒素B亚单位-脂质体复合物组,Ⅳ组:免疫后14 d测定IgG2a组.记录分析关节炎评分及组织病理学评分,采用ELISA方法测定血清IgG2a水平.结果 正常对照组小鼠无关节炎发生.Ⅱ组关节炎发生率显著高于Ⅲ组(100% vs 28.6%,P<0.05);Ⅱ组关节炎评分显著高于Ⅲ组(5.40 vs0.43,P<0.01);Ⅱ组关节炎组织病理累计评分显著高于Ⅲ组(16.00 vs 2.85,P<0.05).Ⅰ组IgG2a水平极低,为38 ng/ml,Ⅱ组IgG2a水平显著升高,达3922 ng/ml,Ⅲ组IgG2a水平为3219 ng/ml,较Ⅱ组降低(P<0.05);Ⅳ组IgG2a水平为98 ng/m1,较Ⅰ组升高(P<0.01).结论 口服Ⅱ型胶原肽-霍乱毒素B亚单位-脂质体复合物可诱导免疫耐受,缓解关节炎的进展.
    • 夏春娥; 张建华; 赵雪梅; 梁平
    • 摘要: Objective To study the effective immunotherapy for Alzheimer's disease with anti-amyloid β(Aβ) protein monoclonal antibodies coupled with olfactory nerve cell translocator function of cholera toxin B subunit(CB) that enter into the hippocampus of mice by bypassing their blood brain barrier. Methods Anti-Aβ monoclonal antibodies (IgG), prepared with IgG hybrid tumor cell strains,were purified and coupled with CB-IgG containing periodate sodium,and divided into CB-IgG group,IgG group,CB group,and saline group. The volume and efficiency of IgG that entered into the hippocampus of mice after intranasal administration were measured by Western blot,immunohistochemistry and MRI,respectively. Results The IgG that entered into the hippocampus was 5-fold higher in CB-IgG group than in IgG group(60% vs 12% >P<0. 05). Immuno-histochemistry showed that the IgG entered into the granular cells in dentate gyrus and into the pyramidal cells in CAI region. The number of positive cells in dentate gyrus and CAI region was 5-fold and 3-fold higher in CB-IgG group than in IgG group(P<0. 01). Magnetic resonance diffusion tensor imaging showed that the effect of IgG on brain was more significant in CB-IgG group than in IgG group(P<0. 01). Conclusion Intranasal administration of CB-IgG coupling agents can carry more anti-Aβ monoclonal antibodies into the hippocampus by bypassing the blood brain barrier,which is 5-fold higher than that of IgG.%目的 利用霍乱毒素B亚单位(CB)的嗅神经细胞轴浆转运载体功能,将其与抗β淀粉样蛋白(Aβ)单抗偶联,绕过血脑屏障进入小鼠大脑海马部位的效率及改善情况,为老年性痴呆的免疫治疗探索更有效途径.方法以抗Aβ单抗杂交瘤细胞株制备抗Aβ单抗(IgG),纯化后用过碘酸钠法将其与CB偶联(CB-IgG),选择31只小鼠经鼻腔给药,分为CB-IgG组、IgG组、CB组、生理盐水组,分别以3次实验完成.采用Western blot、免疫组织化学及MRI方法检测单抗进入小鼠大脑部位的量及效率,并进行比较.结果 CB-IgG组有60%的IgG进入大脑中,IgG组有12%进入大脑,CB-IgG组较IgG组效率高5倍.IgG主要进入齿状回的颗粒细胞和CA1区的椎体细胞,在齿状回CB-IgG组阳性细胞为IgG组的5倍,在CA1区CB-IgG组阳性细胞为IgG组的3倍(P<0.05,P<0.01).弥散张量成像分析显示,CB-IgG小鼠给药前后表观弥散系数变化较IgG明显(P<0.01).结论 CB-IgG偶联物鼻腔给药可以绕过血脑屏障将更多抗Aβ单抗进入脑内海马部位,其效率比单用IgG提高了5倍.
    • 黄钧; 施金谷; 陈明; 黄艳华; 温华成; 彭民毅; 王瑞; 梁万文
    • 摘要: 免疫佐剂是一种先于或与抗原同时使用,能够增强机体的非特异性免疫能力及相应抗原的免疫原性,但其本身不具备抗原特性的物质.文章对鱼用口服疫苗免疫佐剂的作用机理以及霍乱毒素(CT)、大肠杆菌不耐热肠毒素(LT)、细胞因子等几种主要鱼用口服疫苗免疫佐剂的应用情况进行综述,发现鱼用口服疫苗免疫佐剂的研究应用过程中仍存在作用机理研究相对滞后、忽略肠道黏膜免疫机理特殊性、使用成本过高、安全性等问题,建议今后加强对鱼类肠道黏膜免疫机理以及口服疫苗免疫佐剂作用机理的研究,优化口服疫苗免疫佐剂的免疫剂量和程序,降低生产成本,研发出更为广泛、廉价的口服疫苗免疫佐剂,提高其安全性等,以促进水产养殖业的健康发展.%Though adjuvant itself does not possess antigen characteristics, when it is used before or together with antigen, it can fortify non-specific immunity ability and immunogenicity to the antigen. Mechanism of oral vaccine immune adjuvant for fishes and the current application status of major adjuvants including cholera toxin (CT) , heat-labile enterotox-in (LT) and cytokine were reviewed in the paper. Several problems were found such as lagged mechanism research, ignorance to particularity of intestinal mucosal immunity, high cost, and safety, etc. To stimulate sound development of aqua-culture industry, a slew of measures should be adopted including sustaining researches on mechanism of intestinal mucosal immunity and oral vaccine immune adjuvant, optimization of immunizing dose and procedure of oral vaccine immune adjuvant, decreasing development and research cost, developing cheaper and safer oral vaccine immune adjuvant, so enhancing its safety to promote health development of aquaculture industry.
  • 查看更多

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号