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为进一步探究黄芪多糖对肠道黏膜及口蹄疫疫苗免疫的增强作用,给试验小鼠口服4 d黄芪多糖,之后接种口蹄疫商品疫苗,收集二免后1～3周血清,采用间接夹心ELISA法检测特异性免疫球蛋白G(IgG)水平及抗体效价;二免后3周处死小鼠,收集十二指肠组织,用实时荧光定量PCR法检测肠道组织CD80和CD86、主要组织相容性复合体Ⅱ(MHC-Ⅱ)、Toll样受体4(TLR-4)及核因子-κB(NF-κB)p65的mRNA表达水平。结果表明:试验组小鼠口服黄芪多糖二免后第2,3周血清IgG水平及抗体效价显著高于生理盐水对照组(P0.05);二免后3周,肠道组织CD80、CD86、MHC-Ⅱ、TLR-4及NF-κB p65的mRNA表达水平显著高于生理盐水对照组(P0.05)。说明口服黄芪多糖能够上调肠道黏膜固有免疫细胞免疫分子基因的表达,从而促进口蹄疫疫苗免疫的抗体反应。 相似文献
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为了了解猪血凝性脑脊髓炎病毒(Procine hemagglutinating encephalomyelitis virus,PHEV)感染机体后对树突状细胞(Dendritic cell,DC)的激活状况,以及DC在PHEV感染过程中参与免疫应答的能力,本试验分离了BALB\c小鼠骨髓细胞,并通过条件培养基诱导培养8d,获得纯度约77.69%的DC。将PHEV接种DC后,分别对其表面成熟标志分子CD40、CD80、MHCⅡ类分子以及分泌炎症因子的能力进行检测分析。结果显示,PHEV感染DC后T细胞共刺激分子CD40、CD80及MHCⅡ均有一定程度的上调,同时DC分泌细胞因子和趋化因子的能力显著增强,尤其IL-1β的mRNA表达量增高近10倍。经荧光定量PCR方法检测病毒刺激后DC模式识别受体的表达情况结果显示,TLR4和TLR9表达量变化不明显,TLR7的表达受到抑制;但Rig-I的表达量显著增加。结果表明,PHEV在体外能有效的活化DC并促使其成熟为有效的抗原提呈细胞,具有潜在的激活T、B淋巴细胞的能力。 相似文献
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为获得在Sf9昆虫细胞中表达的日本血吸虫钙网织蛋白(Schistosoma japonicum calreticulin protein,SjCRT)并分析其活化小鼠骨髓来源树突状细胞的功能,将构建的重组杆状病毒转移载体pFastBacHTA-SjCRT转入DH 10Bac细胞,得到重组穿梭质粒reBacmid-SjCRT,再转染到Sf9昆虫细胞,进行重组蛋白的表达.用Westem blot和间接免疫荧光对表达蛋白进行鉴定.His柱亲和层析法纯化表达的蛋白,Westen blot鉴定纯化后的蛋白.从BALB/c小鼠产生骨髓来源的树突细胞mDCs,用纯化的重组SjCRT蛋白与mDCs共培养,流式细胞术检测mDCs细胞的表面分子MHCⅡ、CD40和CD86的表达.结果显示,在Sf9昆虫细胞中成功表达了SjCRT蛋白;纯化后的重组SjCRT蛋白既能被感染日本血吸虫42 d的兔阳性血清识别,也能被原核表达的重组SJC RT蛋白免疫鼠的血清所识别.流式细胞术结果显示,与对照组的相比,SjCRT蛋白刺激组mDCs细胞表面分子MHCⅡ和CD86的表达量显著增强(P＜0.05).可见,在Sf9昆虫细胞中表达的SjCRT蛋白能刺激小鼠骨髓来源树突细胞表型的成熟. 相似文献
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本试验旨在建立一种体外诱导培养小鼠未成熟树突状细胞(dendritic cell,DC)的方法。应用重组粒细胞-巨噬细胞集落刺激因子(rGM-CSF)在体外诱导小鼠骨髓前体细胞分化为未成熟树突状细胞,进行形态学观察、细胞表型分析、刺激T细胞增殖等方法,对小鼠髓源未成熟树突状细胞的体外诱导培养进行鉴定。试验结果显示,小鼠骨髓来源的DC在体外培养8 d后,特异性细胞表面标志CD11c的表达量达到81.09%,中度表达MHCⅡ,低表达CD40、CD80、CD86。本试验成功地建立了体外小鼠髓源DC扩增的方法。 相似文献
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《畜牧与兽医》2015,(7):75-79
研究淫羊藿苷(ICA)对小鼠髓源树突状细胞(DC)分化及成熟的影响。小鼠骨髓细胞用GM-NSF和IL-4培养5 d,然后用免疫磁珠法纯化DC细胞,试验组分别加入淫羊藿苷2、5、10和20 mg/m L,空白对照组加等量RPMI-1640,阳性对照组加脂多糖(LPS),6组分别同时作用48 h。流式细胞仪检测CDllc、主要组织相容性复合物(MHC)-Ⅱ类分子及协同刺激分子CD80、CD86表达水平和细胞摄取抗原的能力,ELISA检测产生的细胞因子(IL-2、IL-10、IL-12),混合淋巴细胞反应检测细胞提呈抗原的能力。结果表明:4个添加淫羊藿苷组的CD80、CD86、CDllc、MHC-Ⅱ类分子表达水平均明显高于空白对照组,分泌IL-2、IL-10、IL-12能力比空白对照组增加,吞噬FITC-dextran的能力下降,并可促进同种异基因T细胞的增殖。说明淫羊藿苷可以促进体外培养的小鼠髓源DC的成熟,促进DC诱导的免疫应答启动。 相似文献
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为揭示玉米赤霉烯酮(ZEA)免疫抑制作用的机理,试验以小鼠原代脾淋巴细胞为材料,刀豆蛋白A (ConA)作为特异性刺激剂,用不同浓度的ZEA (0,10,20,40μmol/L)处理细胞,运用流式细胞术以及流式液相蛋白定量技术检测趋化因子受体CCR2、CCR7的表达和趋化因子MIP-1α及RANTES的分泌情况。结果显示,与未刺激活化的T淋巴细胞相比,ConA组细胞CCR2和CCR7的表达、MIP-1α和RANTES的分泌均显著升高(P0. 01)。随染毒浓度升高,ConA刺激细胞的CCR2和CCR7表达率、及MIP-1α和RANTES分泌量均呈现下降趋势,与ConA组比较,20和40μmol/L ZEA染毒组CCR2表达率和MIP-1α分泌量均差异显著(P0. 05),40μmol/L ZEA染毒组CCR7表达率和RANTES分泌量均差异显著(P0. 05)。结果表明,ZEA可以一定程度上影响T淋巴细胞参与的免疫趋化效应,发挥免疫抑制作用。 相似文献
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《畜牧兽医学报》2016,(3)
旨在探究BVDV感染对牛外周血来源的树突状细胞成熟及Th1和Th2型细胞因子分泌水平的影响,进一步揭示BVDV感染对机体免疫机能的影响机制。从牛外周血分离单核细胞,诱导培养为树突状细胞后接种BVDV共培养,采用显微镜观察细胞的形态,流式细胞术分析细胞表面标志分子,半定量RT-PCR法检测Th1型细胞因子IL-12p40和Th2型细胞因子IL-10的mRNA转录水平。结果显示,获得形态及表型典型的树突状细胞,诱导纯度为93.81%;BVDV接种组树突状细胞表面的MHCⅡ类分子、CD40分子、CD80分子均明显低于未接种组,差异极显著(P0.01);BVDV接种组的IL-12p40 mRNA转录水平低于未接种组,差异显著(P0.05);而IL-10mRNA转录水平高于未接种组,差异显著(P0.05)。结果说明BVDV感染影响树突状细胞的成熟及功能,并能通过高效表达Th2型细胞因子IL-10、降低Th1型细胞因子IL-12p40而影响Th1/Th2的平衡。 相似文献
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《中国兽医学报》2016,(7):1086-1091
为了研究PRRSV感染对猪外周血来源的树突状细胞成熟及Thl及Th2型细胞因子分泌水平的影响,进一步探讨PRRSV调控树状细胞Th1和Th2型免疫应答的潜在机制,揭示PRRSV感染对机体免疫机能的影响。我们从猪外周血分离单核细胞,诱导培养为树突状细胞后接种PRRSV共培养,显微镜观察细胞的形态,流式细胞术分析细胞表面的共刺激分子,半定量RT-PCR法检测Thl型细胞因子IL-12和Th2型细胞因子IL-10的mRNA转录水平。结果显示:经鉴定证实获得形态及表型典型的树突状细胞;流式分析结果表明PRRSV接种组树突状细胞表面的SLA-II-DR类分子、CD40分子、CD80分子均明显低于未接种组,差异极显著(P0.01);RT-PCR半定量结果表明PRRSV接种组的IL-12mRNA转录水平低于未接种组,差异显著(P0.05),而IL-10mRNA转录水平高于未接种组,差异显著(P0.05)。结果表明:PRRSV感染影响树突状细胞的成熟,并能通过高效表达Th2型细胞因子IL-10降低Th2型细胞因子Th1而影响Thl/Th2的平衡。 相似文献
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为了探讨鸡骨髓源树突状细胞（bone marrow-derived dendritic cells,BMDCs）的体外诱导培养方法,并分析鸡树突状细胞（DCs）的主要生物学特性,将用淋巴细胞分离液分离的鸡骨髓细胞经差速贴壁纯化后获得单个核细胞,然后经粒细胞-巨噬细胞集落刺激因子（GM-CSF）和白细胞介素4（IL-4）体外诱导分化,细胞培养后第7天再加入脂多糖（LPS）继续培养48 h刺激成熟,分别于倒置显微镜和电子显微镜下进行形态变化观察,同时应用流式细胞仪对鸡骨髓源树突状细胞表面标志进行分析、鉴定。结果显示鸡骨髓细胞培养7 d后,细胞体积增大,细胞表面长出树突状小突起,细胞表面高表达MHCⅡ和CD11c分子,经LPS刺激后,突起伸长变粗,扫描电镜观察呈典型的树突状细胞形态,细胞表面MHCⅡ表达显著升高,依据上述方法成功获得大量而高纯度的鸡骨髓源树突状细胞,为进一步研究禽类DCs的生物学功能及其在某些疾病发生中的作用奠定了基础。 相似文献
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胸腺依赖性细胞即 T细胞具有多种重要的免疫功能 ,不同的免疫功能与其细胞膜上的分化抗原 (CD)的种类相关联。其中 CD4和 CD8是关键的分化抗原。 CD4分子是单链糖蛋白 ,是自身主要组织相容性复合体 (MHC) 类抗原的受体。研究表明 ,其功能性分子可能是低聚体 [1 ] 。CD8分子也是糖蛋白 ,包含α链和β链 ,是 MHC 类抗原的受体。 CD4和 CD8与相应 MHC抗原结合是 T细胞在胸腺外发挥免疫功能的生化基础 ,也与 T细胞在胸腺微环境中的分化有关。来自骨髓的前 T细胞表面无任何 CD标志 ,在胸腺微环境中先后表达CD2、CD7、CD3抗原和 T… 相似文献
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Kortmann P 《Tijdschrift voor diergeneeskunde》2007,132(10):408-9; author reply 409
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Thirteen nematode species are recorded from Botswana. Illustrations are given for Ecuménicas monohystera (de Man, 1880) Thome, 1974; Eudorylaimus diadematus (Cobb in Thorne & Swanger, 1936) Andrássy, 1959; Labronema mauritiense Williams, 1959; Disoolaimus brevis Siddiqi, 1964; D. major Thorne, 1939; Aporcelaimellus adriaani Botha & Heyns, 1990; A. micropunctatus Botha & Heyns, 1990; A. papillatus (Bastian, 1965) Baqri & Khera, 1975; A. parapapillatus Botha & Heyns, 1990 and a specimen belonging to Prodorylaimus or to Laimydorus. Measurements are given for the above-mentioned species as well as for Discolaimium simplex Siddiqi, 1965 and Discolaimoides bulbiferus (Cobb, 1906) Heyns, 1963. A new Mesodorylaimus species viz. M. usitatoides is described. For the first time males are described for A. adriaani and A. micropunctatus. Discolaimus paramajorCoomans, 1966 is considered a possible synonym of D. major. 相似文献
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Fickel J Lieckfeldt D Richman LK Streich WJ Hildebrandt TB Pitra C 《Veterinary microbiology》2003,91(1):11-21
The recently described elephant endotheliotropic herpesviruses (EEHV) have been associated with the deaths of numerous captive elephants. A proposed tool for the detection of EEHV infection in elephants is the PCR-based screening for EEHV-DNA in whole blood samples. Unfortunately, this detection method has only been successful in post-mortem analyses or in animals already displaying clinical signs of EEHV disease, thus rendering this method unsuitable for identification of carrier elephants. Here, we focus on glycoprotein B (gB) for serologic assay development, since gB is an envelope protein known to induce a neutralising antibody response in other herpesvirus infections. We sequenced the entire gB gene from five Asian elephants with EEHV, representing four different gB variants. Computer-aided methods were used to predict functionally important regions within EEHVgB. An extra-cytoplasmic region of 153 amino acids was predicted to be under positive selection and may potentially contain antigenic determinants that will be useful for future serologic assay development. 相似文献
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Objective To describe the bacterial flora present in the normal conjunctiva of donkeys from Sicily (Italy). Animals studied A total of 46 healthy donkeys housed in 3 locations within the territory of Palermo (Sicily, Italy) were studied. Donkeys ranged from 2 to 13 years of age, with a median age of 6 years. Procedures Forty‐six conjunctival swabs were obtained from both eyes of each animal, and specimens were cultured for aerobic bacteria. Furthermore, the antimicrobial activity of methicillin (1 μg) and oxacillin (5 μg) on Staphylococcus spp. isolates was evaluated, and a specific PCR assay, which allows the detection of mecA gene specific for methicillin‐resistant Staphylococcus aureus (MRSA) strains, was performed. Results Forty of 46 (86.9%) donkeys were positive for bacteria. Eighty bacterial isolates, representing 9 bacteria genera, were successfully cultured. The most frequently recovered bacterial genus was Staphylococcus (52/80 isolates; 65%). Several strains (20/80 isolates; 25%) belonging to the Enterobacteriaceae family were also isolated, among which the most frequently isolated genus was Enterobacter (eight isolates). Of the 52 Staphylococcus spp. isolates, 14 (26.9%) strains were oxacillin/methicillin resistant. The mecA gene was detected in 6/52 (11.5%) strains. Conclusions This study contributes to the knowledge about normal ocular flora and MRSA occurrence in donkey farms in Sicily. 相似文献
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Isolation of leptospira hardjo from the opossum (trichosurus vulpecula) Extract Sir, — In 1971 and 1972 the Department of Health and the Ministry of Agriculture and Fisheries conducted surveys on the incidence of leptospirosis among fanners and their stock on the Hauraki Plains. As a result, Leptospira hardjo was identified for the first time in New Zealand, being isolated from humans (Christmas et al., 1974) and from dairy cattle (Lake, 1973). Evidence to date suggests that most human infections in New Zealand, whether of L. hardjo or of other serotypes, are contracted while milking. 相似文献