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《中国兽医学报》2015,(4):597-600
本文旨在研究槲皮素和乙酸龙脑酯对细菌脂多糖(LPS)诱导小鼠流产的保护作用及其对小鼠子宫IL-10水平和脾脏CD80+/CD86+细胞数量的影响。试验选用LPS尾静脉注射(0.10μg/鼠),制造小鼠流产模型,于怀孕第4~7d分别口服不同保胎药物,检测各组(n=10)小鼠的流产率、胚胎吸收率、子宫组织IL-10水平和脾脏CD80+/CD86+表达的变化。发现LPS诱导流产的小鼠IL-10含量降低,CD80+/CD86+比值升高,预先口服不同保胎药物后,不同程度的抑制了LPS的作用,其中以槲皮素和乙酸龙脑酯联合使用组的保胎效果最为明显,并且IL-10含量显著升高,CD80+/CD86+比值显著降低,与LPS流产组比较均差异显著(P0.05)。这些结果表明,LPS诱导流产与机体IL-10和共刺激分子CD80+/CD86+有关。保胎中药成分槲皮素和乙酸龙脑酯有降低小鼠脾脏CD80+/CD86+比值,促进母胎界面Th2细胞因子IL-10分泌的作用。 相似文献
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石菖蒲对LPS致流产小鼠的保胎作用及子宫免疫细胞的影响 总被引：1，自引：0，他引：1
为研究CD4+/CD8+T淋巴细胞和F4/80+巨噬细胞在流产发生机制中的意义,探讨中药石菖蒲的安胎作用机理,本试验选用细菌脂多糖(LPS)给小鼠尾静脉注射(0.1μg/只)制造流产模型,免疫组织化学方法检测小鼠子宫中CD4+,CD8+T淋巴细胞和F4/80+巨噬细胞的数量和分布情况.结果显示,应用LPS诱导流产后小鼠子宫中CD4+T淋巴细胞数量增多,CD8+T淋巴细胞数量无明显变化,CD4+/CD8+升高(P<0.01);F4/80+巨噬细胞数量也显著增多,与对照组比较差异极显著(P<0.01).预先口服保胎中药石菖蒲,能明显抑制LPS的作用,使小鼠流产率和胚胎吸收率降低,CD4+/CD8+比值降低,F4/80+巨噬细胞数量也降低.结果表明,LPS诱导小鼠流产与小鼠子宫中CD4+/CD8+比值和巨噬细胞数量有关,石菖蒲能调节小鼠子宫CD4+/CD8+T淋巴细胞和巨噬细胞数量,起到安胎作用. 相似文献
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黄芩白术对LPS诱导流产小鼠的保胎作用及子宫内TNF-α含量的影响 总被引：8，自引：1，他引：7
为了研究THl细胞因子TNF -α(肿瘤坏死因子 )在流产发生机制中的意义 ,探讨中药黄苓白术的安胎作用及机理 ,本试验用细菌脂多糖 (LPS)尾静脉注射 (每鼠 0 1μg) ,诱导昆明小鼠流产 ,ELISA方法测定子宫匀浆中TNF -α的含量。发现LPS诱导流产的小鼠 ,子宫内TNF -α显著升高。预先口服保胎中药黄芩白术 ,则显著抑制LPS的作用 ,使母鼠胚胎吸收率降低 ,子宫内TNF -α含量也显著降低。这些结果表明 ,LPS诱导流产与子宫内TNF -α升高有关。保胎中药黄芩白术有抑制母体子宫与胎儿界面THl细胞因子TNF -α分泌的作用 相似文献
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黄芩白术对LPS诱导流产小鼠的保胎作用及子宫内TNF—α含量的影响 总被引：13，自引：2，他引：11
为了研究TH1细胞因子TNF－α（肿瘤坏死因子）在流产发生机制中的意义,探讨中药黄苓白术的安胎作用及机理,本试验用细菌脂多糖（LPS）尾静脉注射（每鼠0.1μg）,诱导昆明小鼠流产,ELISA方法测定子宫匀浆中TNF－α的含量。发现LPS诱导流产的小鼠,子宫内TNF－α显著升高。预先口服保胎中药黄芩白术,则显著抑制LPS的作用,使母鼠胚胎吸收率降低,子宫内TNF－α含量也显著降低。这些结果表明,LPS诱导流产与子宫内TNF－α升高有关。保胎中药黄芩白术有抑制母体子宫与胎儿界面TH1细胞因子TNF－α分泌的作用。 相似文献
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为分析猪圆环病毒2型(PCV2)感染小鼠后脾细胞中CD4+CD25+调节性T细胞(Tregs)占CD4+T细胞比例的动态变化,探讨Tregs与PCV2感染的关系,本研究选择清洁级昆明小鼠60只,随机分成实验组和对照组,实验组腹腔接种PCV2,分别在接种后第0 d、5 d、10 d、20 d、30 d和60 d取脾脏制备单细胞悬液,用FITC-CD4和PE-CD25单克隆抗体标记Tregs,采用流式细胞仪检测Tregs占总CD4+T细胞百分比的动态变化。结果表明感染组小鼠脾细胞中Tregs百分比从第5 d开始逐步上升,第20 d达峰值后逐渐下降,感染组Tregs百分比第10 d、20 d、30 d时显著高于对照组(p0.05),但第60 d两组间差异不显著(p0.05)。试验结果证明PCV2感染昆明小鼠后,可在小鼠脾脏内诱导明显的Tregs增殖,这些增殖的细胞可能在PCV2感染中发挥免疫抑制作用。 相似文献
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用提取的川牛膝多糖(RCPS)和O型口蹄疫灭活疫苗协同免疫ICR小鼠,研究了其对免疫小鼠体内树突状细胞成熟的影响,进而探讨了RCPS增强口蹄疫疫苗免疫应答的机制。试验鼠在二免后2周处死,无菌取脾,制备脾细胞悬液,通过流式细胞术测定了共刺激信号分子(CD40,CD80,CD86)的表达水平,同时应用实时定量PCR检测了MHCⅠ、MHCⅡ类分子,CXC型趋化因子受体4(CXCR4)和CC趋化因子受体7(CCR7)mRNA表达水平。结果显示,与对照组相比在二免后14d,RCPS明显增强了共刺激信号分子CD40,CD80,CD86的表达水平,同时提高了MHCⅠ,MHCⅡ,CXCR4和CCR7mRNA表达水平。综上所述,RCPS配合FMD疫苗免疫小鼠,可显著促进树突状细胞的成熟和迁移。 相似文献
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用非致细胞病变（noncytopathic,NCP）和致细胞病变（cytopathic,CP）型牛病毒性腹泻病毒（BVDV）感染临床健康BVDV检测阴性的荷斯坦奶牛外周血单核细胞（PBMC）,利用实时荧光定量PCR技术对感染后共刺激分子CD80和CD86mRNA转录水平的变化进行定量分析。结果表明,在NCP型BVDV感染牛PBMC后CD80在4h（P〈0.05）和12,24h（P〈0.01）出现2次转录高峰,CD86在6h（P〈0.05）出现转录高峰;CP型BVDV感染后,CD80在24h（P〈0.05）出现转录高峰,CD86在6h（P〈0.05）出现转录高峰。尽管CD80在NCP型BVDV感染后呈现较复杂的动态变化,但结果提示NCP型和CP型BVDV感染均可导致牛PBMC的共刺激分子CD80和CD86基因转录在感染早期明显受到抑制,PBMC的抗原呈递能力受到影响。 相似文献
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鸡CD4和CD8分子研究进展 总被引：11，自引：0，他引：11
鸡CD4和CD8分子是T细胞表面重要的表面标志,绝大部分胸腺细胞表面都表达CD4和CD8分子,但大多数脾脏和外周血的T细胞表面只表达CD4或CD8分子,或两者都不表达。少数脾脏和外周血中存在的CD4 CD8 T 细胞具有重要的生物学功能。不同品种鸡的CD4 基因具有高度的保守性,而CD8αcDNA 在胞外区表现为多型性。鸡的CD4和CD8分子在组织分布、结构和功能等方面有着很大的相似性。针对鸡CD4 和CD8分子的单克隆抗体为研究这些免疫细胞的生理功能及细胞表面标志的生物学作用等创造了有利条件。 相似文献
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The aim of this study was to determine whether the population of lymphocytes expressing CD4 and CD8 molecules changed in the white follicles during atresia in chickens. Frozen sections of healthy, early atretic, advanced atretic and late atretic follicles were immunostained for CD4 and CD8, and the populations of positive cells were analyzed under a light microscope. In the healthy, early atretic and advanced atretic follicles both CD4+ and CD8+ cells were localized in the theca layer, but not in the granulosa layer. However, an influx of CD4+ and CD8+ cells was observed not only in the theca but also in the follicular cavity that was formed by disintegration of the oocyte in late atretic follicles. The frequency of CD4+ T cells in the theca layer did not differ among healthy, early atretic and advanced atretic follicles, but was significantly increased in the late atretic follicles (P < 0.05). The frequency of CD8+ cells showed a pattern of change that resembled that of CD4+ T cells, with a significantly greater population in late atretic follicles than the other follicles (P < 0.05). These results suggest that CD4+ and CD8+ cells are increased in the late atretic follicles, probably to promote the tissue regression. 相似文献
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M. C. DURÁN S. WILLENBROCK R. CARLSON K. FEIGE I. NOLTE H. MURUA ESCOBAR 《Equine veterinary journal》2013,45(2):249-253
Reasons for performing study: CD14 positive (CD14+) cells are the precursor cells of monocyte‐derived dendritic cells (DCs). In horses their potent antigen‐presenting capacity and ability to induce an effective immune response classify these cells suitable for several therapeutic approaches such as for equine sarcoid. However, in horses, the generation efficiency of DCs from adherent peripheral blood mononuclear cells (PBMCs) is currently still poor. Objectives: Establishment of a simple short protocol to enhance DC generation in horses by using a human CD14 monoclonal antibody (mAb) and an automated magnetic activated cell sorting (MACS) system. Methods: Peripheral blood mononuclear cells were isolated from fresh heparinised blood samples of 3 horses and primarily stained for flow cytometric analysis (FACS) with a mAb against human CD14 as well as a secondary phycoerythrin (PE) conjugated antibody to determine the initial percentage of CD14 cells in the sample. Peripheral blood mononuclear cells were used for automated MACS using the same primary and secondary antibodies and analysed by FACS. CD14+ selected cells were cultured for 4 days adding granulocyte‐macrophage colony‐stimulating factor (GM‐CSF) and interleukin‐4 (IL‐4) to the culture media. Dendritic cell generation was assessed analysing cell morphology and surface marker expression (hCD83, hCD86, eqMHCII). Results: Prior to selection, the mean percentage of CD14+ cells in the total cell population was 5.5%, further gaiting of this cell population resulted in 78.46% CD14+ monocytes. After our positive selection the mean percentage of CD14+ cells in the population was 98% without affecting viability. After culture, DC yield was 2‐fold higher than in previous published outcomes. Conclusions: The additional CD14 cell separation step after PBMC isolation significantly amplified the number of CD14+ cells, increasing the number of generated DCs. Potential relevance: The number of DCs available is critical for further use of these cells and the herein described protocol will therefore help to improved DC generation for therapeutic approaches in horses. 相似文献
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通过构建猪共刺激分子CD80和CD86的缺失cDNA竞争分子,用竞争PCR技术定量检测了猪圆环病毒2型(PCV2)感染后猪肺泡巨噬细胞(PAM)中CD80和CD86的mRNA水平,分析了PCV2感染对猪共刺激分子CD80和CD86的mRNA表达的影响.结果显示,PCV2感染后,PAM中CD80和CD86的mRNA水平变化趋势一致,只是CD86的升降幅度更大.在PCV2感染后3d,CD80与CD86的mRNA水平下降至最低,随后迅速上升,至14d达到高峰,尔后快速下降,21d及以后恢复正常.本研究结果表明,PCV2初期可明显抑制猪共刺激分子CD80和CD86的基因转录. 相似文献
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Tomasz Ma?lanka Jerzy Jan Jaroszewski 《Journal of veterinary science (Suw?n-si, Korea)》2013,14(2):125-134
The purpose of this study was to evaluate the effect of meloxicam (MEL) on selected immune parameters of bovine CD25highCD4+, CD25lowCD4+, and CD25-CD4+ cells. Peripheral blood mononuclear cells (PBMCs) collected from 12-month-old heifers were treated with MEL at a concentration corresponding to the serum level of this medication following administration at the recommended dose (MEL 5 × 10-6 M) and at a concentration 10 times lower (MEL 5 × 10-7 M). After 12 and 24 h of incubation with the drug, the percentage of CD25highCD4+ cells decreased; however, this disturbance was quickly reversed. Furthermore, the absolute number of CD25highCD4+ cells in the PBMC populations treated with MEL 5 × 10-6 M for 48 and 168 h was increased. Prolonged (168 h) exposure to the drug increased the percentage of Foxp3+ cells in the CD25highCD4+ cell subpopulation. The higher dose of MEL was found to significantly increase the percentage of IFN-γ+ cells among the CD25-CD4+ cells. These results indicated that MEL does not exert an immunosuppressive effect by depleting CD4+ cells and suppression of IFN-γ+ production by these cells. Furthermore, IL-10 and TGF-β production was not changed following exposure to MEL. 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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CD4和CD8分子在细胞免疫中的作用及其与PRRSV感染的关系 总被引：12，自引：0，他引：12
CD4和CD8是T细胞的两个重要的细胞表面标志，它们在T细胞免疫应答中发挥重要的作用本文将T细胞的免疫学基础及CD4和CD8与PRRSV感染的关系进行综述。 相似文献
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荧光定量RT-PCR检测鸡CD4、CD8基因表达水平 总被引：2，自引：0，他引：2
白细胞分化抗原CD4和CD8在机体免疫应答及其信号传递过程中发挥着重要作用。本试验建立了定量检测鸡CD4和CD8 mRNA表达水平的SYBR Green I实时荧光定量RT-PCR（RRT-PCR）方法,并采用该方法对26-50日龄商品鸡外周血淋巴细胞（PBL）中CD4和CD8 mRNA表达水平进行了检测。结果显示：所建立的RRT-PCR对CD4和CD8 mRNA的扩增效率分别为93%和91%;线性范围分别在10^-4-10^-9和10^-3-10^-9;相关系数分别为0.998 0和0.999 9;最低分别能检测105和120拷贝;熔解曲线分别在78.2和86.7℃附近出现1个单特异峰;组内变异系数分别在1.13%-2.15%和1.17%-3.68%,组间变异系数分别在1.16%-3.25%和1.66%-2.86%。26-50日龄鸡PBL CD4和CD8的mRNA表达水平有小幅波动,与采用流式细胞术检测结果的报道一致。本试验建立的RRT-PCR方法敏感性高、稳定性和再现性好,为检测鸡CD4、CD8基因表达水平提供了精确定量的新方法。 相似文献