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1.
《中国预防兽医学报》2015,(12)
为评价19ku脂蛋白信号肽优化表达的牛病毒性腹泻病毒(BVDV)重组卡介苗对小鼠的免疫效果,本研究将已构建的rBCG/19ku-E_2、rBCG/E_2、rBCG/pMV261(pMV261空载体构建的rBCG作为实验对照组)、卡介苗(BCG)及BVDV灭活苗免疫小鼠,通过检测血清抗体效价、T淋巴细胞亚群含量及细胞因子水平,评价其体液免疫与细胞免疫效果。结果显示,rBCG/19ku-E_2可以引起BVDV特异性抗体的产生,并且抗体水平要高于rBCG/E_2、rBCG/pMV261组。对CD4~+、CD8~+T淋巴细胞亚群含量的检测结果表明,rBCG免疫小鼠对CD4~+、CD8~+T淋巴细胞亚群没有显著影响。通过对IL-4、IL-10、IL-12和IFN-γ细胞因子检测结果表明,rBCG主要诱导Th1型细胞免疫应答,rBCG/19ku-E_2诱导的细胞因子水平低于BCG免疫组,但均高于细胞因子的平均水平。结果表明,rBCG/19ku-E_2可以诱导小鼠产生较好的特异性体液免疫应答和细胞免疫应答,为BVDV新型疫苗研究奠定基础。 相似文献
2.
鸡马立克氏病活疫苗免疫效力比较试验 总被引：1，自引：0，他引：1
用ＨＶＴ冻干苗、ＨＶＴ细胞结合苗、ＣＶＩ９８８细胞结合苗、ＳＢ１＋ＦＣ１２６双价活疫苗、３０１Ｂ／１＋ＦＣ１２６双价活疫苗和Ｚ４＋ＦＣ１２６双价活疫苗等６种鸡马立克氏病（ＭＤ）疫苗免疫ＳＰＦ白来航鸡或普通伊莎鸡，用鸡马立克氏病病毒（ＭＤＶ）强毒ＧＡ株、京－１血毒以及鸡马立克氏病超强毒ｖｖＭＤＶ－Ｍｄ５毒株分别攻击进行免疫效力比较试验。试验表明，ＭＤ单价苗的免疫效力强弱顺序依次是ＣＶＩ９８８、ＨＶＴ细胞结合苗和ＨＶＴ冻干苗，这３种ＭＤ单价苗均能给免疫鸡群提供有效的免疫保护力。ＳＢ１＋ＦＣ１２６、Ｚ４＋ＦＣ１２６和３０１Ｂ／１＋ＦＣ１２６等３种ＭＤ双价苗免疫效力显著高于ＭＤ单价苗，均能给免疫鸡群提供较强的免疫保护力，并能有效地抵抗ｖｖＭＤＶ－Ｍｄ５毒株的致瘤作用。Ｚ４＋ＦＣ１２６和３０１Ｂ／１＋ＦＣ１２６ＭＤ双价苗免疫效力无显著差异 相似文献
3.
有丝分裂原对离体boPBMC增殖和分泌Ig的作用 总被引：2，自引：1，他引：1
应用＾３Ｈ－ＴｄＲ掺入法，ＥＬＩＳＡ和ＦＡＣＳ研究了离体奶牛外周血单核细胞（ｂｐＰＢＭＣ）对有丝分裂原的免疫应答。ＰＷＭ和ＣｏｎＡ能不同程度地诱导ｂｏＰＢＭＣ增殖和分泌Ｉｇ；而ＳＥＢ只能使ｂｏＰＢＭＣ高度增殖而不分泌Ｉｇ（Ｐ〉０．０５）。ＰＷＭ诱导的ｂｏＰＢＭＣ经１２ｄ培养，其中ＣＤ４＋／ＣＤ８＋细胞的比率为２．９：１；而ＳＥＢ诱导的细胞为０．３：１。离体ｂｏＰＢＭＣ主要分泌ＩｇＭ和ＩｇＧ１，只有 相似文献
4.
鸡贫血病灭活疫苗免疫后雏鸡免疫状况研究 总被引：1，自引：0，他引：1
应用鸡传染性贫血病灭活疫苗免疫雏鸡后,１０、２０、３５、４５天检测了空白对照组、免疫组的外周血液、胸腺、脾脏和法氏囊内ＣＤ３＋、ＣＤ４＋、ＣＤ８＋、γδＴ细胞亚群、ＩｇＧ阳性细胞的变化;并且在３５天、４５天检测免疫攻毒组和攻毒组上述细胞免疫和体液免疫指标的变化。结果显示,应用贫血病灭活疫苗后免疫组雏鸡的Ｔ细胞亚群的ＣＤ４／ＣＤ８比值出现明显降低,ＩｇＧ阳性细胞有升高变化;免疫攻毒组雏鸡状态明显好于攻毒组。研究表明,鸡传染性贫血病疫苗可以激发机体体液免疫反应,并在一定程度上诱导ＣＴＬ活化,对ＣＡＶ攻击产生足够的免疫保护。 相似文献
5.
具有中和活性的减蛋综合征病毒单抗的研制 总被引：1，自引：0，他引：1
用减蛋综合征病毒毒株ＷＰＤＶ２０５纯化抗原免疫ＢＡＬＢ／ｃ小鼠，在最后一次免疫后第３天取脾细胞与ＳＰ２／０细胞在ＰＥＧ－４０００的作用下融合。用间接ＥＬＩＳＡ初步筛选出阳性克隆１０株（４Ｂ１、１Ｄ４、２Ｄ６、３Ｄ６、３Ａ５、２Ａ１、３Ｃ６、３Ｃ１、１Ｂ３和２Ｃ５）。这些杂交瘤细胞经克隆化和再次检测后生产腹水，用微量细胞中和试验筛选出具有中和活性的单克抗隆体４株（４Ｂ１、３Ｃ１、３Ｃ６和２Ｃ５），其 相似文献
6.
表达大肠杆菌肠毒素ST1-LTB融合蛋白双价基因工程菌株的构建 总被引：4，自引：0，他引：4
重组菌株ＢＬ２１（ＤＥ３）（ｐＸＥＴＳＬＴ１）经ＩＰＴＧ诱导后,其表达产物经ＳＤＳ－ＰＡＧＥ和ＥＬＩＳＡ检测,结果表明重组菌株可以高效表达大肠杆菌肠毒素ＳＴ１－ＬＴＢ 融合蛋白,该融合蛋白占菌体总蛋白的３３．２１％ ,而且已失去天然ＳＴ１肠毒素生物毒性。用从ＩＰＴＧ 诱导的工程菌中提取的包涵体或经甲醛灭活的工程菌制成抗原免疫小鼠,结果免疫小鼠至少能抵抗１．５ＭＬＤ 的大肠杆菌强毒株Ｃ８３９０２（Ｋ８８ａｃ,ＳＴ＋ ,ＬＴ＋ ）的攻击。用提取的包涵体免疫家兔后,采集的血清能够中和天然ＳＴ１肠毒素的毒性。这表明构建的工程菌株ＢＬ２１（ＤＥ３）（ｐＸＥＴＳＬＴ１）可以作为预防幼畜大肠杆菌性腹泻基因工程菌苗的候选株 相似文献
7.
弓形虫主要表面抗原P30基因克隆与表达 总被引：2，自引：0，他引：2
将液氮保存的弓形虫 Ｎ Ｔ 株经小鼠复壮后，取腹腔液提取弓形虫基因组 Ｄ Ｎ Ａ，采用 Ｐ Ｃ Ｒ 方法从弓形虫 Ｎ Ｔ 株中扩增出约 ８００ ｂｐ 的片段。产物经 Ｅｃｏ Ｒ Ｉ和 Ｘｂａ Ｉ酶切后，克隆到 ｐ Ｕ Ｃ１９ 载体中，构建了 ｐ Ｂ Ｖ Ｐ３０ 非融合表达质粒和 ｐ Ｅ Ｔ Ｐ３０ 融合表达质粒。ｐ Ｂ Ｖ Ｐ３０ 转化到宿主菌 Ｄ Ｈ５α、ｐ Ｅ Ｔ Ｐ３０ 转化到宿主菌 Ｂ Ｌ２１ （ Ｄ Ｅ３）后，分别经温控诱导和 Ｉ Ｐ Ｔ Ｇ 诱导，产物经 Ｓ Ｄ Ｓ Ｐ Ａ Ｇ Ｅ 分析，ｐ Ｂ Ｖ Ｐ３０ 未发现表达产物，ｐ Ｅ Ｔ Ｐ３０ 出现约 ３０ ０００ 的产物。 Ｗ ｅｓｔｅｒｎ ｂｌｏｔｔｉｎｇ 显示，该蛋白与兔抗弓形虫血清发生特异性反应；薄层扫描显示，该蛋白占菌体总蛋白的 ２０％ 以上。 相似文献
8.
本研究采用流式细胞仪技术对鸡眼区相关淋巴组织在鸡新城疫疫苗点眼免疫后的局部 Ｔ 淋巴细胞亚群的变化进行了研究。研究发现， Ｌａｓｏｔａ 系 Ｎ Ｄ 疫苗点眼免疫后眼区相关淋巴组织对 Ｎ Ｄ 疫苗可 产生良好的细胞免疫应答，免疫组 Ｃ Ｄ＋４ Ｔ及 Ｃ Ｄ＋８ Ｔ 淋巴细胞数量于点眼免疫后迅速升高，其百分比含量明显高于非免疫组。 相似文献
9.
抗℃型肉毒毒素单克隆抗体的研究 总被引：1，自引：0，他引：1
用透村培养法制备的Ｃ型肉毒毒素的类毒素，免疫ＢＡＬＢ／Ｃ小鼠，取其脾细胞与小鼠骨髓瘤细胞系ＳＰ２／０融合。经ＨＡＴ选择培养基选择培养，其细胞融合率平均为７４．５％。用间按ＥＬＩＳＡ法筛选后，共获得９４孔产生抗Ｃ型肉毒毒素抗体的杂交瘤阳性孔。选其中１Ｃ２、１Ｄ１２、１Ｅ８、１Ｇ６、１Ｇ１１、２Ｂ１２、２Ｃ１１、２Ｅ１２、２Ｇ１１、２Ｈ３、３Ａ４、３Ｃ５、３Ｄ３、３Ｆ７、３Ｈ６共１５孔用有限稀释法进行 相似文献
10.
感染CIAV雏鸡岛免疫器官对ND疫苗的细胞免疫应答 总被引：2，自引：0，他引：2
对１日龄感染ＣＩＡＶ雏鸡接种ＮＤ疫苗后，其免疫器官组织Ｔ细胞数量的动态变化研究，结果，感染ＣＩＡＶ雏鸡ＮＤ疫苗免疫后，其胸腺和脾脏以及盲肠桃体和哈德尔腺的Ｔ细胞数量，于接种ＮＤ疫苗后较未感染ＣＩＡＶ免疫对照雏鸡明显减少，表明感染雏鸡的中枢和外周免疫器官及局部免疫组织对ＮＤ疫苗的细胞免疫应答功能降低，ＮＤ强毒攻击后，感染免疫鸡的免疫保护率明显低于未感染免疫对照鸡。 相似文献
11.
为评价牛病毒性腹泻病毒(BVDV)E2截短基因重组卡介苗对牛的免疫效果,将BVDV抗原抗体阴性牛随机分为rBCG-pMV361-E2-1(1 aa-297aa)、rBCG-pMV361-E2-2(1 aa-345 aa)、rBCG-pMV361-E2-3(1 aa-374 aa)、rBCG-pMV361-E2-4(45 aa-297 aa)、rBCG-pMV361-E2-5(45 aa-345 aa)、rBCG-pMV361-E2-6(45 aa-374 aa)、BVDV对照组、BCG对照组和PBS对照组,各组牛免疫相应疫苗后通过特异性抗体检测、淋巴细胞增殖试验、淋巴细胞亚群检测和细胞因子检测分析疫苗的免疫效果。结果显示,BVDV E2截短基因重组卡介苗均可诱导BVDV特异性抗体的产生,rBCG-pMV361-E2-1组抗体水平高于其他重组卡介苗试验组和BVDV对照组。淋巴细胞增殖试验结果显示,rBCG-pMV361-E2-2组SI为2.038±0.21,显著高于其他重组卡介苗试验组(P<0.01)。牛外周血CD4^+、CD8^+T淋巴细胞亚群检测结果显示,rBCG-pMV361-E2-5组牛外周血中CD4^+和CD8^+ T淋巴细胞亚群含量与PBS组比较,差异极显著(P<0.01)。IFN-γ检测结果显示,rBCG-pMV361-E2-1的IFN-γ水平显著高于其他试验组和对照组(P<0.01)。研究表明,rBCG-pMV361-E2-1可诱导接种牛产生较好的体液免疫应答,rBCG-pMV361-E2-1、rBCG-pMV361-E2-2和rBCG-pMV361-E2-5在诱导细胞免疫应答上效果较好。 相似文献
12.
Qiuyue Wang Jianhua Li Xichen Zhang Quan Liu Chengwu Liu Guangpeng Ma Lili Cao Pengtao Gong Yanan Cai Guocai Zhang 《Veterinary parasitology》2009,160(3-4):198-203
Two recombinant Mycobacterium bovis BCG (rBCG) strains carrying the Eimeria tenella rhomboid gene (Rho) delivered by extrachromosomal vector pMV261 and integrative vector pMV361 were evaluated for their ability to protect chickens against E. tenella challenge. The chickens were immunized intranasal with BCG, rBCG pMV261-Rho, or rBCG pMV361-Rho twice at a 2-week interval. All the recombinant BCG immunized chickens developed specific immune responses, and there was a significant increases of the percentages of CD4+ and CD8+ cells compared to the control (P < 0.05). Challenge experiments demonstrated that the two rBCG strains could provide significant protection against E. tenella challenge. But vaccination with rBCG pMV261-Rho induced higher specific antibody titers and produced greater protection rate (56.04%) than rBCG pMV361-Rho group (P < 0.05). These results indicated that M. bovis BCG is a novel vaccine vector to express and present antigens of E. tenella, and rBCG has a potential as vaccine in chickens. 相似文献
13.
Mexas AM Fogle JE Tompkins WA Tompkins MB 《Veterinary immunology and immunopathology》2008,126(3-4):263-272
HIV-induced AIDS may be mediated by the activation of immunosuppressive CD4+CD25+ T regulatory cells (Treg cells). Treg cells have been shown to regulate CD4+ and CD8+ immune responses to HIV and FIV antigens in vitro. We tested the hypothesis that Treg cells become infected and activated during the acute infection with FIV leading to the suppression of CD4+ T helper cell responses. Cats were experimentally infected with FIV-NCSU1 and blood and lymph node cells were collected at weekly intervals following inoculation. Real-time RT-PCR was used to determine plasma viremia and the relative expression of FIV, FoxP3, TGF-beta, and GAPDH mRNA copies in CD4+CD25+ and CD4+CD25- T cell subsets. Flow cytometry was used to assess the absolute numbers of each cell type and the expression of surface TGF-beta and intracellular FoxP3 in CD4+CD25+ and CD4+CD25- T cells at each time-point. Treg suppression of IL-2 production in CD4+ T helper cells was assessed by ELISPOT assays. Our results showed that peak viremia occurred at 2 weeks post infection and correlated with maximal infectivity in CD4+CD25+ T cell populations. FIV-gag-mRNA levels were higher in CD4+CD25+ T cells than CD4+CD25- T cells throughout the acute phase of infection. Induction of FoxP3 and TGF-beta indicated activation of Treg cells during the acute stage infection, which was confirmed by Treg cell suppression of IL-2 production by CD4+ Th cells in an ELISPOT assay. Our findings support the hypothesis that early activation of Treg immunosuppressor function may limit an effective anti-FIV response, contributing to the establishment of chronic infection and the immunodeficiency caused by this virus. 相似文献
14.
Humoral and cell-mediated immune responses of d/d histocompatible pigs against classical swine fever (CSF) virus 总被引：1，自引：0，他引：1
Piriou L Chevallier S Hutet E Charley B Le Potier MF Albina E 《Veterinary research》2003,34(4):389-404
A better understanding of cell-mediated immune responses to classical swine fever virus (CSFV) is essential for the future development of improved vaccines. We analyzed the generation of cell-mediated and humoral immune responses in d/d histocompatible pigs following CSFV infection or vaccination. Viral infection induced high T cell responses with high primary and secondary CTL activity correlated with high IFN-gamma production, whereas vaccination with a live vaccine followed by infection mainly induced neutralizing antibody but low cell-mediated responses. Moreover, high IgG1 response was associated with high IFN-gamma response following infection whereas a weak IFN-gamma response was related to a good IgG2 response but a low IgG1 production. These data could reflect Th1/Th2-like balance of immune responses depending upon immunization protocols, which has not yet been described in the pig. T-cell responses to CSFV were evidenced by CSFV-specific CD25 upregulation on CD4-CD8+, but not on CD4+CD8- cells, which further illustrated the importance of CTL responses after infection. Our results indicated that generation of cell-mediated immune responses was much higher following intranasal/oral CSFV infection than after intramuscular vaccination, which implies that the capacity of new CSFV vaccines to induce higher T-cell responses should be considered. 相似文献
15.
16.
L A van Pinxteren M G Bruce I Campbell A Wood C J Clarke A Bellman B Morein D R Snodgrass 《Veterinary immunology and immunopathology》1999,71(1):53-67
A comparison of the effect on the immune responses in gnotobiotic lambs was made between an iscom vaccine prepared from recombinant rotavirus VP6 protein, an inactivated rotavirus/iscom-matrix vaccine and a vaccine comprising inactivated rotavirus alone. All three vaccines induced immunological priming and some degree of protection was observed after a single oral dose. However, different immune responses were induced in response to a virulent infection. The group vaccinated with the rotavirus/iscom-matrix vaccine showed a Th2-like response characterised by rotavirus-specific antibodies and a down-regulation of IFNgamma in jejunal Peyer's patches. Both Th1-like and Th2-like immune responses were induced in the group receiving the VP6 vaccine as seen by significantly increased expressions of IFNgamma and IL-6 in the jejunal Peyer's patch together with an increased percentage of CD8+ T cells in the intestine and rotavirus-specific antibodies at mucosal surfaces. Iscom vaccines given orally have the ability to induce both Th1-like and Th2-like immune responses in a ruminant model. 相似文献
17.
The role of CD4+CD25+ regulatory T cells in viral infections 总被引：5，自引：0，他引：5
Vahlenkamp TW Tompkins MB Tompkins WA 《Veterinary immunology and immunopathology》2005,108(1-2):219-225
Many virus infections result in the suppression of one or more functions of the immune system. Multiple mechanisms have been proposed to explain viral-induced immunosuppression, including an imbalance in the cellular Th1/Th2 or cytokine profile, induction of anergy, depletion of effector cells and most recently the activation of CD4+CD25+ regulatory T (T reg) cells. CD4+CD25+ T reg cells are a subset of circulating CD4+ T cells with suppressive properties. CD4+CD25+ T reg cells were first identified in mice as cells capable of maintaining self-tolerance by suppressing autoreactive T cells. This review focuses on interactions between CD4+CD25+ T reg cells and viral pathogens. Most cases in which CD4+CD25+ T reg cells participate in response to infection reported so far involve chronic or persistent viral infections. Examples have been growing recently and include members of different viral families including retroviridae, herpesviridae and picornaviridae. It is currently not known how microbes are recognized by CD4+CD25+ T reg cells and whether exoantigen-specific T reg cells are of the same lineage as self-reacting natural T reg cells or represent peripherally induced counterparts derived from CD4+CD25- T cells. The findings that T reg cells influence the functional immunity during viral infections, however, might indicate that, in some cases, virus-specific T reg cells not only influence immune pathology or prevent pathogen elimination but also can promote a generalized state of immunosuppression in vivo such that the host is more susceptible to secondary infections with other pathogens or has reduced resistance to tumors. Conceivably, the activities of T reg cells might be one of the contributing reasons why it has been difficult so far to produce effective vaccines against some persisting viral infections. 相似文献
18.
Franco-Acuña DO Pinheiro J Oliveira-Menezes A Brandolini SV DaMatta RA de Souza W 《Veterinary parasitology》2011,183(1-2):72-78
CD154 is a cell surface molecule expressed by activated T cells. CD40 and CD154 interaction is critically important in regulating humoral and cell-mediated immune responses. In this study we have investigated whether a DNA vaccine encoding rhoptry protein 1 (ROP1) of Toxoplasma gondii, and encoding ovine CD154 induces an enhanced ROP1-specific immune response in sheep. Two groups of twelve animals received two intramuscular injections, of a DNA plasmid encoding T. gondii ROP1 antigen (group 1) or an ROP1 antigen fused to ovine CD154 (group 2). There were two control groups of sheep. One was injected with an empty vector (group 3) and the other received no injections at all (group 4). The injection of the plasmid containing ROP1 (group 1) at weeks 0 and 4 induced a significant IgG2 response at week 2 which was amplified at week 4 after the booster injection and persisted to week 8 compared to the control animals in groups 3 and 4. For IgG1, significant differences from the control animals were only observed from week 5 onwards. The fusion of CD154 and ROP1 elicited significant IgG1 and IgG2 responses from week 1 which were amplified from weeks 5 to 8 compared to the control animals in groups 3 and 4. The IgG1 response was significantly higher in group 2 animals receiving pROP1-CD154 compared to group 1 receiving pROP1 only. There was no significant difference in IgG2 responses between groups 1 and 2. Significant differences in IFN-γ levels were only observed in treatment group 1 at week 2 and treatment group 2 at weeks 1 and 2 compared to the control animals. The results demonstrated that an intramuscular injection of pROP1-CD154 gene to sheep significantly enhanced their immune response and induced a mixed Th1/Th2 response while the intramuscular injection of pROP1 only induced a Th1-specific immune response. 相似文献
19.
重组鸡白细胞介素-6/2融合蛋白对新城疫(LaSota株)活疫苗免疫增强作用研究 总被引：2，自引：2，他引：0
为探究重组鸡白细胞介素-6/2融合蛋白(rChIL-6-Linker-ChIL-2,重组融合蛋白)对新城疫病毒(NDV)活疫苗(LaSota株)的免疫增强作用,本研究将90只SPF鸡随机分为6组,分别为PBS对照组、NDV弱毒苗对照组、rChIL-6-Linker-ChIL-2免疫增强组、rChIL-6蛋白免疫增强组、rChIL-2蛋白免疫增强组及rChIL-6+rChIL-2混合蛋白免疫增强组,将鸡白细胞介素重组融合蛋白水剂与LaSota株联合接种于SPF鸡,分别采用MTS法、流式细胞术、ELISA和HA/HI法检测接种前后不同时间各组鸡外周血及脾淋巴细胞增殖活性、鸡外周血中CD3+CD4+/CD3+CD8+T淋巴细胞的百分含量、血清中Th1/Th2型细胞因子表达水平及免疫抗体水平等指标。结果显示,接种后7～21d时,与NDV弱毒苗对照组相比,同时接种重组融合蛋白组鸡淋巴细胞增殖活性、外周血CD3+CD4+/CD3+CD8+T淋巴细胞的百分含量比值及血清中重组鸡IL-4蛋白(rChIL-4)、ChIL-6、ChIL-2、重组鸡IFN-α蛋白(ChIFN-α)、ChIFN-γTh1/Th2型细胞因子表达水平明显提升;HI免疫抗体较NDV弱毒苗对照组提高了1.0～1.9个滴度,较单一rChIL-6、rChIL-2对照组分别提高了0.2～0.7、0.2～1.1个抗体滴度。综上所述,rChIL-6-Lin-ker-ChIL-2融合蛋白对NDV(LaSota株)活疫苗在鸡体内具有明显的免疫增强效果。 相似文献
20.
Gershwin LJ 《Comparative immunology, microbiology and infectious diseases》2012,35(3):253-257
Bovine respiratory syncytial virus (BRSV) is a respiratory pathogen of cattle that causes severe disease in calves alone and as one of several viruses and bacteria that cause bovine respiratory disease complex. Like human RSV this virus modulates the immune response to avoid stimulation of a vibrant CD8+ T cytotoxic cell response and instead promotes a Th2 response. The Th2 skew sometimes results in the production of IgE antibodies and depresses production of the Th1 cytokine interferon γ. Innate immune cells have a pivotal role in guiding the adaptive response to BRSV, with selective secretion of cytokines by pulmonary dendritic cells. Here we review some of the pertinent observations on immune responses to BRSV infection and vaccination and illustrate how experimental infection models have been used to elucidate the immunopathogenesis of BRSV infection. Recent experiments using intranasal vaccination and/or immune modulation with DNA based adjuvants show promise for effective vaccination by the stimulation of Th1 T cell responses. 相似文献