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1.
本试验采用免疫组化方法检测球虫感染鸡肠道组织中CD4^＋、CD8^＋T细胞数量,探讨中药“球康”抗球虫的作用机理。试验共设不感染不给药组、不感染给“球康”组（2％拌料）、感染给“球康”组和感染不给药组共4组。感染球虫后第2、4、5、7和9天,每组随机捕杀4只鸡,采取盲肠中段进行检测。结果,雏鸡感染球虫后,盲肠组织中CD4^＋、CD8^＋T细胞数量显著高于不感染组,感染给中药“球康”组鸡CD4＋T细胞数量在第2,4,5和9天均高于感染不给药组,在第4天和第5天差异显著（P＜0．05）;CD8＋T细胞数量在第2,5,7和9天高于感染不给药组,第5天差异显著（P＜0．05）,第7天达到最高峰。说明中药“球康”通过增加球虫感染鸡肠道黏膜CD4^＋、CD8^＋T细胞数量,提高细胞免疫水平,以增强机体对球虫的抑杀作用。 相似文献
2.
选择17头28日龄的CSFV和PRRSV抗体均为阴性的仔猪,于试验的第1天和第14天分别对其进行猪瘟耐热保护剂活疫苗（兔源）和高致病性猪繁殖与呼吸综合征Nsp2A1882—2241弱毒疫苗免疫。在免疫后的第28、42天采集外周血液,分析特异性抗体表达量和外周血T淋巴细胞表型的变化,评估猪瘟免疫对猪繁殖与呼吸综合征免疫的影响。结果显示,在CSF免疫后第28、42天,CSFV高抗组中的CD4^＋、CD4^＋／CD8^＋、CD4^＋CD8^＋和CD4-CD8数目均比CSFV低抗组高,CD3^＋和CD8^＋细胞数量比CSFV低抗组低;PRRS高抗组中,CD4CD8-细胞含量高于PRRS低抗组;在CSF免疫后第28天,CSFV抗体产生较高（阳性比率为73．33％）,PRRSV抗体产生较低（阳性比率仅为6．67％）。在CSF免疫后的第42天,CSF高抗组中PRRSV抗体阳性比率较CSF低抗组高8．33％。结果表明,CSFV特异性抗体产生高时能增加PRRSV特异性细胞免疫应答,增加CD4^＋细胞、CD4^＋CD8^＋细胞数量,提高机体免疫水平。CD3＋和CD4CD8-细胞应答作用值得重视。 相似文献
3.
雏鸡感染毒害艾美耳球虫后免疫器官T细胞亚群的动态变化 总被引：2，自引：0，他引：2
采用ABC法检测了毒害艾美耳球虫（Eimeria necatrix）初次、二次感染雏鸡后，其免疫器官T细胞亚群的动态变化。结果发现：雏鸡初次感染E．necatrix后，其胸腺和脾脏的CD4^＋T细胞和CD8^＋T细胞于感染后4～21d不同程度高于未感染的对照雏鸡，14～16d达峰值，随后缓慢下降。其中CD4^＋T细胞较CD8^＋T细胞增殖辐度大，持续时间也较长。Enecatrix二次感染雏鸡后，上述免疫器官的CD4^＋T细胞和CD8^＋T细胞数量在感染后2～7d呈下降趋势，随后回升，至10～14d明显高于对照和初次感染雏鸡。其中CD8^＋T细胞在二次感染后降幅较小，回升更迅速，增殖幅度也较大。表明鸡CD4^＋T细胞和CD8^＋T细胞在抵抗E．necatrix感染的不同时期发挥不同的作用。 相似文献
4.
高温下清凉冲剂对鸡免疫器官中CD4+、CD8+ T细胞数量的影响 总被引：3，自引：0，他引：3
采用免疫组化方法检测鸡免疫器官中CD4^＋、CD8^＋T细胞数量，探讨高温下清凉冲剂对机体细胞免疫机能的影响及其药理作用。108只农大3号35目龄公雏，随机分为3组，每纽36只鸡，即常温对照组、高温对照组和高温用药组。用药组饲喂中药煎荆（浓度为1g／ml），用药量与饲料量比为1：1000。在试验的第1、4、8、10天各组捕杀5只。分别采取胸腺、脾脏、法氏囊检测。结果高温下。用药组免疫器官中CD4^＋、CD8^＋T细胞数量均高于高温对照组。第8、10天差异极显著（P〈0．01）。表明高温下清凉冲剂可以增加鸡免疫器官中CD4^＋、CD8^＋T细胞数量，有效地提高鸡细胞免疫水平。 相似文献
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传染性法氏囊病病毒超强毒感染SPF鸡免疫器官中CD4+和CD8+T淋巴细胞动态分布 总被引：1，自引：0，他引：1
利用免疫组织化学染色对传染性法氏囊病病毒（IBDV）超强毒LX株感染SPF鸡免疫器官中CD4^ 和CD8^ T淋巴细胞的动态分布进行了研究。超强毒LX株接种2周龄SPF雏鸡，在其法氏囊、脾脏、胸腺、盲肠扁桃体、骨髓和哈氏腺中均可检出IBDV抗原的存在和CD4^ 与CD8^ T淋巴细胞的数量改变。在法氏囊中，CD4^ 淋巴细胞主要存在于淋巴滤泡间隙和滤泡皮质，而CD8^ T淋巴细胞则丰在于整个淋巴滤泡和滤泡间隙，并且CD8^ T淋巴细胞数量明显多于CD4^ T淋巴细胞，在接种后14d仍未见CD4^ 和CD8^ T淋巴细胞数量减少。脾脏中CD4^ T淋巴细胞主要存在于外周小动脉淋巴鞘或散在，而CD8^ T淋巴细胞则多存在于外周小动脉淋巴鞘和红髓。接种后胸腺中CD4^ 和CD8^ T淋巴细胞在皮质中减少，但在髓质增多，尤其是CD8^ T淋巴细胞数明显多于CD4^＋T淋巴细胞。盲肠扁桃体中CD4^ 和CD8^ T淋巴细胞主要存在于发生中心，尤其是CD8^ T淋巴细胞数比CD4^ T淋巴细胞明显多。骨髓和哈氏腺中也可见CD4^ 和CD8^ T淋巴细胞，而且CD8^ T淋巴细胞更多。在这些淋巴器官中，病毒损伤部位出现CD4^ 和CD8^ T淋巴细胞的迁入聚集，表明T淋巴细胞可能参与IBDV超强毒的免疫致病过程。 相似文献
6.
为研究青蒿组方中药对鸡免疫力的影响,试验选取14日龄三黄鸡120只,平均分为4组:感染给药组(1组),感染不给药组(2组),不感染给药组(3组),不感染不给药组(4组).感染组人工接种柔嫩艾美耳球虫孢子化卵囊.接种后第4、7、10 d运用流式细胞仪测定各组鸡血液中CD4^+、CD8^+T淋巴细胞值及二者的比值.结果:1组CD4^+、CD8^+T淋巴细胞值及其比例在接种后第4、7、10 d均高于2组,差异显著(P<0.05);2组CD4^+、CD8^+T淋巴细胞平均比值低于其他3个组.结论:青蒿组方中药可促进鸡血液中CD4^+、CD8^+T淋巴细胞生成,进而增强机体的免疫功能. 相似文献
7.
将猪生殖与呼吸综合征病毒（PRRSV）和猪圆环病毒2型（PCV2）单感染和共感染的6周龄仔猪，于感染前和感染后第3、7和10d，采用血常规法、SWC3a单色流式细胞术以及CD3／CD4／CD8三色流式细胞术分析了感染猪外周血中白细胞、粒细胞、单核细胞、NK细胞、弦T细胞的含量。结果，感染后第3d和第7d，PRRSV感染组、PCV2感染组以及PRRSV＋PCV2共感染组猪的白细胞、单核细胞、粒细胞、NK细胞、弦T细胞总数显著下降，并且共感染组比单感染组下降更加严重。结果表明，PRRSV＋PCV2共感染对仔猪外周血天然免疫细胞的影响具有协同效应，意味著在感染旱期可导致更加严重的先天免疫抑制。 相似文献
8.
苷肽注射液对犬外周血CD 4、CD 8比值的影响 总被引：1，自引：1，他引：0
以20只健康犬为研究对象,随机分为四组,每组5只,分别注射苷肽注射液、苷肽注射液和犬五联疫苗、犬五联疫苗、生理盐水,各组犬于注射的第0、2、7、15天采血,检测不同组之间的CD 4＋和CD 8＋比值变化规律。结果表明：苷肽注射液单独应用和与疫苗同时应用,在注射的第2天就可以显著提高CD4＋、CD8＋比值,到第7天时达到最高值。并且发现,注射苷肽注射液同时注射犬五联疫苗组和单独注射苷肽注射液组CD4＋、CD8＋比值显著高于单独注射犬五联疫苗组（P〈0.05）,这说明苷肽注射液具有增强免疫的作用。 相似文献
9.
用猪生殖与呼吸综合征病毒（PRRSV）与猪圆环病毒2型（PCV2）共感染40日龄健康大白仔猪，利用实时荧光定量PCR技术对共感染仔猪肺泡巨噬细胞（PAM）共刺激分子CD80一CD86的mRNA转录水平进行了定量分析。结果表明，在感染后第3d和第7dCD80与CD86mRNA转录显著下调（P〈0．05），感染后第14dCD86mRNA转录水平仍低于未感染对照组。尽管CD80mRNA转录水平在第14d和第28d高于对照组，CD86mRNA转录水平在第28d高于对照组，两者在第42d均高于对照组，但无显著差异。证实，PRRSV和PCV2共感染可导致猪肺泡巨噬细胞的共刺激分子CD80-CD86基因转录在感染早期明显受到抑制，PAM的抗原呈递能力受到影响。 相似文献
10.
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
11.
《Research in veterinary science》2013,94(3):1367-1379
This paper investigates the in vitro effect of dexamethasone on bovine CD25highCD4+, CD25lowCD4+ and CD25−CD4+ T cells. Only a small percentage of bovine CD25highCD4+ (2–4%) and CD25lowCD4+ (1–2%) cells expressed Foxp3. Dexamethasone caused considerable loss of CD25−CD4+ cells, but it increased the relative and absolute numbers of CD25highCD4+ and CD25lowCD4+ lymphocytes, while at the same time reducing the percentage of Foxp3+ cells within the latter subpopulations. Considering all these, as well as the intrinsically poor Foxp3 expression in bovine CD25+CD4+, it can be concluded that the drug most probably increased the number of activated non-regulatory CD4+ lymphocytes. It has been found that changes in cell number were at least partly caused by proapoptotic effect of the drug on CD25−CD4+ cells and antiapoptotic effect on CD25highCD4+ and CD25lowCD4+ cells. The results obtained from this study indicate that the involvement of CD4+ lymphocytes in producing the anti-inflammatory and immunosuppressive effect of dexamethasone in cattle results from the fact that the drug had a depressive effect on the production of IFN-γ by CD25−CD4+ cells. Secretion of TGF-β and IL-10 by CD4+ lymphocytes was not involved in producing these pharmacological effects, because the drug did not affect production of TGF-β and, paradoxically, it reduced the percentage of IL-10+CD4+ cells. 相似文献
12.
Federico A. Zuckermann Christina Peavey William M. Schnitzlein Daniel Schabacker Robert J. Husmann Huaizhi Yang Armin Saalmü ller Joan K. Lunney 《Veterinary immunology and immunopathology》1998,60(3-4):367-387
Swine cell binding analyses of a set of 48 monoclonal antibodies (mAbs), including eleven standards, assigned to the CD44 and CD45 subset group of the Second International Swine CD Workshop yielded 13 clusters. Although none of these corresponded to CD44, seven mAbs formed a cluster which was identified as being specific for restricted epitopes of CD45 (CD45R). In addition, a T-cell subset specific cluster comprised of four mAbs was also identified. Two mAbs (STH106 and SwNL 554.1) reacted exclusively with CD8 bright lymphocytes, the other two (2B11 and F01G9) with a subset of CD4 lymphocytes. The other 10 clusters were either specific for MHC-class I like molecules or overlapped with clusters identified by the adhesion molecule subgroup and are therefore just briefly discussed in this report. The specificity of all the mAbs in the CD45R cluster was verified by their ability to immunoprecipitate distinct proteins and to react with CHO cells expressing individual isoforms of CD45. Three CD45R mAbs (3a56, MIL5, −a2) did react with a 210 kDa isoform(s), while another three (STH267, FG2F9, 6E3/7) only recognized a 226 kDa isoform(s). The remaining one (MAC326) precipitated both a 210 and 226 kDa protein. The specificity of all the mAbs in the CD45R cluster, and of the CD45 common mAbs, was confirmed by their reactivity with CHO cells transfected with cDNAs encoding the extracellular and transmembrane portions of distinct CD45R isoforms. Those mAbs recognizing a 210 kDa protein reacted with CHO cells expressing the CD45RC isoform, while those capable of precipitating a 226 kDa, but not the 210 kDa, polypeptide recognized CHO cells expressing either the CD45RAC and the relatively rare CD45RA isoform. MAC326 was unique in its inability to react with CHO cells engineered to produce the CD45RC and CD45RAC isoforms. Thus, three mAbs (6E3/7, STH267, and FG2F9) appear to be specific for an epitope(s) encoded by the A exon, while one (MAC326) recognizes a determinant encoded by the C exon. The remaining three mAbs (3a56, −a2, MIL5) are apparently specific for an epitope(s) which results from the fusion of the C exon to the invariant leader sequence and is destroyed by inclusion of the A exon. All three CD45 common mAbs, K252.1E4, MAC323 and 74.9.3, did react with the CHO cells lines expressing either the CD45RA, CD45RC, CD45RAC or CD45RO isoforms, but not with untransfected CHO cells. When the natural expression of CD45 isoforms was examined by reacting lymphocytes with CD45R mAbs, a high level expression of isoforms containing the A exon-generated domain was detected in all B cells while the majority of CD4+ T cells had undetectable or lower expression density of this protein than B cells. In contrast, the density of expression of the CD45 isoform(s) containing the C exon-generated domain ranged from undetectable to high in CD4+ T cells whereas the amounts were approximately ten-fold lower in B cells. Overall this panel of CD45 mAbs will be very useful in analyzing the maturation and differentiation of swine lymphoid cells subsets. 相似文献
13.
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
14.
This paper investigates the in vitro effect of dexamethasone on bovine CD25(high)CD4(+), CD25(low)CD4(+) and CD25(-)CD4(+) T cells. Only a small percentage of bovine CD25(high)CD4(+) (2-4%) and CD25(low)CD4(+) (1-2%) cells expressed Foxp3. Dexamethasone caused considerable loss of CD25(-)CD4(+) cells, but it increased the relative and absolute numbers of CD25(high)CD4(+) and CD25(low)CD4(+) lymphocytes, while at the same time reducing the percentage of Foxp3(+) cells within the latter subpopulations. Considering all these, as well as the intrinsically poor Foxp3 expression in bovine CD25(+)CD4(+), it can be concluded that the drug most probably increased the number of activated non-regulatory CD4(+) lymphocytes. It has been found that changes in cell number were at least partly caused by proapoptotic effect of the drug on CD25(-)CD4(+) cells and antiapoptotic effect on CD25(high)CD4(+) and CD25(low)CD4(+) cells. The results obtained from this study indicate that the involvement of CD4(+) lymphocytes in producing the anti-inflammatory and immunosuppressive effect of dexamethasone in cattle results from the fact that the drug had a depressive effect on the production of IFN-γ by CD25(-)CD4(+) cells. Secretion of TGF-β and IL-10 by CD4(+) lymphocytes was not involved in producing these pharmacological effects, because the drug did not affect production of TGF-β and, paradoxically, it reduced the percentage of IL-10(+)CD4(+) cells. 相似文献
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Sarah Costers David J. Lefebvre Bruno Goddeeris Peter L. Delputte Hans J. Nauwynck 《Veterinary research》2009,40(5)
The replication of porcine reproductive and respiratory syndrome virus (PRRSV) in lungs and lymphoid tissues of PRRSV-infected pigs is already strongly reduced before the appearance of neutralizing antibodies, indicating that other immune mechanisms are involved in eliminating PRRSV at those sites. This study aimed to determine whether PRRSV Lelystad virus (LV)-specific cytotoxic T-lymphocytes (CTL) can efficiently eliminate PRRSV-infected alveolar macrophages. Therefore, CTL assays were performed with PRRSV-infected alveolar macrophages as target cells and autologous peripheral blood mononuclear cells (PBMC) from PRRSV-infected pigs as a source of PRRSV-specific CTL. PBMC of 3 PRRSV-infected pigs were used either directly in CTL assays, or following restimulation in vitro. CTL assays with pseudorabies virus (PRV) Begonia-infected alveolar macrophages and autologous PBMC, from 2 PRV Begonia-inoculated pigs, were performed for validation of the assays. In freshly isolated PBMC, derived from PRRSV-infected pigs, CTL activity towards PRRSV-infected macrophages was not detected until the end of the experiment (56 days post infection – dpi). Restimulating the PBMC with PRRSV in vitro resulted in proliferation of CD3+CD8high cells starting from 14 dpi. Although CD3+CD8high cells are generally considered to be CTL, CTL activity was not detected in PRRSV-restimulated PBMC of the 3 pigs until 49 dpi. A weak PRRSV-specific CTL activity was observed only at 56 dpi in PRRSV-restimulated PBMC of one pig. In contrast, a clear CTL activity was observed in PRV Begonia-restimulated PBMC, derived from PRV Begonia-infected pigs, starting from 21 dpi. This study indicates that PBMC of PRRSV-infected pigs contain proliferating CD3+CD8high cells upon restimulation in vitro, but these PBMC fail to exert CTL activity towards PRRSV-infected alveolar macrophages. 相似文献
20.
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