卵巢癌细胞对CD8~+ T细胞活化分子CD69表达的影响

目的:探讨卵巢癌细胞对CD8+T细胞活化分子CD69表达的影响。方法:采用流式细胞术检测3株卵巢癌细胞(OVCAR3、CAOV3和SKOV3)培养上清液对CD8+T细胞表达早期活化分子CD69表达的百分率,酶联免疫吸附法(ELISA)测定CD8+T细胞分泌的细胞因子IFN-γ的水平。结果:与对照组比较,3株卵巢癌细胞培养上清液可对CD8+T细胞CD69的表达产生明显的抑制作用(F=29.90,P<0.01),CD8+T细胞分泌的细胞因子IFN-γ水平显著降低(F=16.31,P<0.01)。结论:卵巢癌细胞早期就能抑制CD8+T细胞的活化,CD69可作为评价免疫效应细胞功能的指标。     

CD4+T细胞、CD8+T细胞、CD57+NK细胞和Vimentin在外阴硬化性苔藓中表达及临床意义

目的:探讨外阴硬化性苔藓中CD4+、CD8+T细胞及CD57+ NK细胞和Vimentin的表达.方法:采用免疫组化S-P法分别检测CD4+T细胞、CD8+T细胞、CD57+NK细胞和VIM阳性细胞在外阴正常皮肤(15例)、外阴硬化性苔藓早期(15例)及进展期(15例)病变中的浸润及表达.结果:CD4+T细胞在外阴硬化性苔藓早期中浸润明显高于正常皮肤,CD8+T细胞在外阴硬化性苔藓早期浅层及进展期深层病变组织中浸润均高于正常皮肤,CD57+ NK细胞在外阴硬化性苔藓早期中浸润明显高于正常皮肤,Vimentin标记的成纤维细胞在外阴硬化性苔藓早期浅层及进展期深层病变中表达明显高于正常皮肤,差异均有统计学意义(P＜0.05).结论:外阴硬化性苔藓中淋巴细胞的浸润与成纤维细胞增殖有一定相关性.     

多囊卵巢综合征与CD8^＋CD28^＋／CD8^＋CD28^-T细胞平衡的关系

目的从内分泌及胰岛素抵抗的角度探讨CD8^＋CD28^＋及CD8^＋CD28^-T（杀伤性／抑制性）T细胞平衡与多囊卵巢综合征（PCOS）的关系。方法收集胰岛素抵抗（IR）与非抵抗（Non-IR）PCOS患者各25例,选取同龄段健康女性30例作为对照组,采用流式细胞术检测外周血CD8^＋CD28^＋及CD8^＋CD28^-T细胞及其胞内细胞因子γ干扰素（IFN-γ）及白细胞介素-4（IL-4）的百分含量;采用放射免疫法检测血清卵泡刺激素（FSH）、黄体生成素（LH）水平及胰岛素水平,并比较患者的胰岛素抵抗指数（HOMA-IR）,同时分析以上几者的相关性。结果IR组CD8^＋CD28^＋T细胞、IFN-γ及胰岛素显著低于健康组及Non-IR组,但IR组CD8^＋CD28^-T细胞、IL-4及HOMA-IR显著高于另外两组,以上任意两组的差异均具有统计学意义（t=0．719～5．892,均P〈0．05）。3组的LH有组间差异（F=3．762,P=0．010）,以IR患者最高,但IR与Non-IR组间无统计学差异（t=0．976,P=0．362）。相关性分析表明CD8^＋CD28^＋T细胞与CD8^＋CD28^-T细胞呈显著负相关（r=-0．816,P=0．000）,CD8^＋CD28^-抑制性T细胞与LH及HOMA指数均呈正相关（r=0．701,r=0．719,均P〈0．05）,但与血清胰岛素水平及均呈负相关性（r=-0．631,P=0．038）。结论PCOS患者的免疫平衡向CD8^＋CD28^-抑制T细胞倾斜,表现为过度抑制,该细胞数量的升高与内分泌紊乱及胰岛素抵抗密切相关。     

CD4+CD25+T细胞在溃疡性结肠炎患者中的表达及意义

目的研究溃疡性结肠炎（UC）患者外周血CD4＋CD25＋调节性T细胞和其特异性标志物Foxp3的表达及其在UC不同病期的变化,探讨其在UC发病机制中的意义。方法研究纳入2007年2月至2008年12月在我院就诊的UC患者40例,其中活动期23例,缓解期17例;同时选择33例肠易激综合征（IBS）患者及32名健康者作为对照。用流式细胞仪检测UC患者、IBS患者和正常对照者的外周血CD4＋CD25＋T细胞阳性率,用RT-PCR检测外周血单个核细胞（PBMC）中Foxp3mRNA的表达,用酶联免疫吸附实验检测血清中白细胞介素-10（IL-10）和转化生长因子-β（TGF—β）的浓度。结果活动期和缓解期UC患者、IBS患者、正常对照者外周血CD4＋T细胞总数相比差异无统计学意义（P=0．126）。CD4＋CD25＋T细胞在CD4＋T细胞中所占比例在活动期和缓解期UC患者中均明显低于IBS患者和正常对照组（P均〈0．01）,活动期患者较缓解期患者更低（P〈0．001）,并且与疾病活动指数（r=-0．660,P〈0．001）及红细胞沉降率（r=-0．572,P=0．001）均呈显著负相关,而IBS患者和正常对照者间差异没有统计学意义（P=0．343）。PBMC中Foxp3mRNA的表达在活动期和缓解期UC患者均明显低于IBS患者和正常对照组（P均〈0．001）。而血清IL-10和TGF—β的浓度在活动期和缓解期UC患者、IBS患者和正常对照者4组间无明显差异（P均〉0．05）。结论活动期UC患者外周血CD4＋CD25＋调节性T细胞明显降低,缓解期UC患者的表达有所升高,并且与临床疾病活动相关,提示这类细胞可能参与了UC疾病的发生发展,Foxp3表达降低可能是导致CD4＋CD25＋T细胞发育障碍的重要因素。     

CD4+CD25+调节性T细胞在艾滋病病毒感染中的作用

CD4+CD25+调节性T细胞(Tregs)是一类具有特殊免疫调节功能的T细胞亚群,是Tregs的重要组成部分,参与多种感染性疾病的免疫应答,在病毒感染的慢性化、免疫病理、阻止自身免疫应答和维持机体免疫平衡等方面发挥重要的作用.此文就CD4+CD25+Tregs在HIV感染进程中的作用作了综述.     

CD8+T细胞在糖尿病发病中作用

目的探讨CD8＋T细胞在糖尿病发病中的作用。方法利用非肥胖糖尿病（NOD）背景的转基因小鼠,将CD4＋T细胞和CD8＋T细胞过继转移到有T细胞缺陷的NOD小鼠（即NOD.scid小鼠）,同时转移到特异性地在β细胞上表达共刺激分子CD80的有T细胞缺陷的NOD小鼠（即NOD.scid.Rip.B7小鼠）,观察两组受鼠胰岛炎和糖尿病的发病情况,并分析其差异。结果转移CD4＋T细胞时,糖尿病发病率在NOD.scid受鼠和NOD.scid.Rip.B7受鼠组的差异无统计学意义（P〉0.05）,转移CD8＋T细胞时,NOD.scid受鼠糖尿病发病率低于NOD.scid.Rip.B7组受鼠,差异有统计学意义（P〈0.001）。结论CD8＋T亚群启动了胰岛的淋巴细胞浸润,CD8＋T细胞是通过与胰岛β细胞直接作用启动糖尿病的发生。     

CD4+CD25+T细胞与复发性流产

CD4+CD25+T细胞是一类具有免疫调节功能的细胞.正常情况下在体内发挥免疫抑制作用.该类细胞分泌白细胞介素10(IL-10)、转化生长因子β(TGF-β),表达CD25(IL-2Rα)、叉头蛋白(FOXP3蛋白)及细胞毒性T淋巴细胞抗原4(CTLA-4)分子等,通过细胞间直接接触或细胞因子间接方式广泛参与自身免疫耐受、肿瘤免疫、移植免疫.妊娠类似同种异体移植,妊娠时脱落人母体循环的胎儿抗原刺激CD4+CD25+T细胞的产生并在母胎界面形成免疫耐受微环境,防止胎儿受到母体排斥.CD4+CD25+T细胞数量或功能失调则会导致各种疾病的发生,如自身免疫病,移植物抗宿主病,流产等.在复发性流产患者体内CD4+CD25+T细胞数目及功能明显下降.实验表明增强CD4+CD25+T细胞数量或功能可以阻止移植物抗宿主病和治疗复发性流产.     

Functional memory CD8+ T cells can be generated in vivo without evident T help

Synthetic cytotoxic T cell (CTL) epitope peptides provide an effective and safe means of vaccination against cancers and viruses, as these peptides can induce specific CD8+ effector T cells in vivo. However, the effector CD8+ T cells induced by the minimal CTL epitope peptides do not last past about 3 weeks after the induction and no functional memory CD8+ T cells are generated. It is held that simultaneous induction of CD4+ T cells by incorporating peptides containing T-helper epitopes in the vaccine at the time of primary vaccination are necessary for the induction of long-lived functional memory CD8+ T cells. We now report that, surprisingly, incorporation of medium length (>20 AA) peptides devoid of detectable T-helper epitopes in a minimal CTL epitope-based vaccine can also induce long-lasting functional tumour antigen specific memory CD8+ T cells that are capable of promoting protection against tumour challenge. This observation may have implications for the formulation of therapeutic anti-cancer and anti-virus peptide vaccines where a strong induction of CD4 T help would be undesirable.     

Cross-priming of long lived protective CD8+ T cells against Trypanosoma cruzi infection: importance of a TLR9 agonist and CD4+ T cells

We recently described that vaccination of mice with a glutathione S transferase fusion protein representing amino acids 261-500 of the Amastigote Surface Protein-2 efficiently cross-primed protective CD8+ T cells against a lethal challenge with the human protozoan parasite Trypanosoma cruzi. In this study, we initially established that this protective immunity was long lived. Subsequently, we studied the importance of TLR9 agonist CpG ODN 1826, TLR4 and CD4+ T cells for the generation of these protective CD8+ T cells. We found that: (i) the TLR9 agonist CpG ODN 1826 improved the efficiency of protective immunity; (ii) TLR4 is not relevant for priming of specific CD8+ T cells; (iii) CD4+ T cells are critical for priming of memory/protective CD8+ T cells.     

CD4+CD25+调节性T细胞与HIV感染关系的研究进展

CD4 CD25 调节性T细胞是一类具有特殊免疫调节功能的T细胞亚群。它能够抑制自身免疫病的发生,参与肿瘤免疫的调节,在感染和移植免疫中也发挥着重要作用。T细胞的这一亚群具有免疫无能和免疫抑制特性,新近发现它亦与艾滋病的发生、发展关系密切。文中就CD4 CD25 调节性T细胞与HIV感染的研究进展进行综述。     

艾滋病病毒感染中的CD8+T细胞应答

与其他病毒有所不同,艾滋病病毒(HIV)侵袭的是人体的免疫细胞,结果机体的免疫能力在发挥作用的同时,也不断受到损害,最终崩溃,其中,CD8+T细胞在急性HIV感染和慢性HIV感染中发生了什么变化?CD8+T细胞对HIV的应答又是如何逐步降低?HIV怎样逃脱了免疫系统的攻击?这一直是HIV研究领域的关注热点。本文对此作了综述。     

内皮细胞微粒与CD8~+ CD25~+ FoxP3~+调节T细胞对子痫前期发生发展的作用探究

目的通过探讨子痫前期患者外周血内皮细胞微粒(endothelial microparticles,EMPs)与CD 8~+ CD 25~+ FoxP 3~+调节T细胞(regulatory T cell,Treg)之间关系,阐明EMPs对Treg功能影响及其在子痫前期发病过程中的机制。方法选取2017年6月至2018年5月在上海市嘉定区妇幼保健院行产检的子痫前期孕妇60例为研究组,其中38例非重度子痫前期患者为A组,22例重度子痫前期患者为B组;同时随机选取60例健康孕妇为对照组。收集所有孕妇外周血,应用流式细胞仪检测外周血EMPs、CD 8~+ CD 25~+ FoxP 3~+ Treg、FoxP 3 mRNA表达水平及转化生长因子-β(transforming growth factor-β,TGF-β)、白介素(Interleukin,IL)-10、IL-6、IL-17血清浓度。比较各组之间以上指标差异并研究其相关性。结果与对照组比较,A、B组EMPs水平显著升高,且B组高于A组,差异有统计学意义(P<0.05)。与对照组比较,A、B组CD 8~+ CD 25~+ FoxP 3~+ Treg比例及FoxP 3 mRNA表达水平显著降低,且B组较A组更低,差异有统计学意义(P<0.05)。与对照组比较,A、B组TGF-β、IL-6、IL-17的血清浓度均升高,其中IL-6、IL-17在B组中水平更高,差异有统计学意义(P<0.05)。TGF-β在A组与B组间差异无统计学意义(P>0.05)。3组患者IL-10水平比较,差异无统计学意义(P>0.05)。相关性分析结果显示,B组EMPs水平与CD 8~+ CD 25~+ FoxP 3~+ Treg、FoxP 3 mRNA表达水平呈负相关(r=-0.379、-0.427,P=0.001、0.004),与TGF-β、IL-6、IL-17呈正相关(r=0.376、0.427、0.257,P=0.024、0.005、0.037),与IL-10不相关(r=0.173,P=0.217)。结论 EMPs在子痫前期患者血浆表达水平上升,在子痫前期发病机制中起到一定的作用,为临床诊断及治疗提供新的思路。     

Dendritic cells expressing BTLA induces CD8+ T cell tolerance and attenuates the severity of diabetes

Numerous evidence demonstrate Type 1 diabetes (T1D) is due to a loss of immune tolerance to islet antigens, and CD8⁺ T cells play an important role in the development of T1D in NOD mice. The novel coinhibitory receptor BTLA may have a regulatory role in maintaining peripheral tolerance, however, its role in autoimmune diabetes is unknown. To explore whether the generation of tolerance aiming at BTLA will help therapeutic intervention in T1D, the NOD mice were treated with genetically modified dendritic cells (DCs) expressing BTLA. The results demonstrated that transfer of modified DCs significantly induced CD8⁺ T cell tolerance and attenuated the severity of diabetes. The findings suggest that genetically modified DC therapies enhancing the BTLA negative cosignal may prove valuable in treating T1D and other autoimmune diseases.     

Antigen-specific activation and proliferation of CD4+ and CD8+ T lymphocytes from brucellosis patients

Salt-extractable antigen from Brucella melitensis 16M (RCM-BM) was used to evaluate the immune response from acute and chronic patients suffering from Brucella infections (in Mexico); their responses were compared with those of healthy controls. As a readout we used upregulation of CD69 (a well-established early activation marker for lymphocytes), lymphocyte proliferation by 3[H]thymidine or 5-bromo-2-deoxyuridine (BrdU) incorporation measured by liquid scintillation or flow cytometry, respectively, and production of gamma interferon (IFN gamma). We compared the antigen-specific response with the response induced by phytohaemagglutinin (PHA) as a positive control. There was no difference between acute patients and the healthy controls in the percentages of CD3+, CD4+ or CD8+ lymphocytes. However, we found that chronic patients had a significant (P < 0.05) increase in the CD8+ T cells, in line with previous studies. Antigen-specific responses to RCM-BM showed a significant (P < 0.05) upregulation of CD69 in both CD4+ and CD8+ T lymphocytes in acute brucellosis patients and in CD8+ T lymphocytes in chronic patients, indicating that both populations became activated by this antigen preparation. Moreover, lymphocyte proliferation from both acute and chronic patients in response to RCM-BM was highly significant (P < 0.001) when compared with healthy controls. However, there were no apparent differences between acute and chronic patients. Although the incorporation of BrdU showed similar results it provided additional information, since we demonstrated that both CD4+ and CD8+ T lymphocytes from acute and chronic patients proliferated equally well in response to RCM-BM. Similar results were observed with intracellular IFN gamma determination. As a whole, our data suggest an important role for both CD4+ and CD8+ T lymphocytes in Brucella infection in humans. As has been reported in mice, it is feasible that activated CD8+ T cells participate in protection against Brucella in humans through cytotoxicity or/and by the production of factors such as interferon and granulysin. The role of these cells should be carefully analysed to understand better their participation in human infection by Brucella.     

CD4~+ Notch1~+调节性T细胞和CD4~+ FoxP3~+调节性T细胞 在不明原因复发性流产中的表达

目的:探讨CD4+Notch1+调节性T细胞和CD4+FoxP3+调节性T细胞在不明原因复发性流产(URSA)中的表达。方法:流式细胞术分析复发性流产和正常妊娠动物模型中雌性小鼠CBA/J脾细胞CD4+CD25+Treg、CD4+FoxP3+Treg和CD4+Notch1+Treg的表达百分率变化。结果:流式细胞术分析(FACS)结果显示,相比于正常妊娠组,在复发性流产中CD4+CD25+Treg表达百分率减少、CD4+FoxP3+Treg表达百分率减少、CD4+Notch1+Treg表达百分率增加。结论:Notch1增加与FoxP3表达减少相关,CD4+Notch1+Treg的表达百分率增加可能是URSA的机制之一。     

足月妊娠分娩发动前后孕妇蜕膜中NK细胞及CD4~+CD25~+T细胞的变化

目的:检测足月妊娠分娩发动前后孕妇蜕膜中NK细胞及CD4+CD25+T细胞的变化情况,探讨它们与分娩发动的关系。方法:对40例健康足月孕妇按临产情况分为足月未临产组和足月临产组,收集孕妇蜕膜组织,密度梯度离心法分离出淋巴细胞,流式细胞术(FCM)检测两组中NK细胞、CD4+CD25+T细胞含量。结果:足月临产组的蜕膜NK细胞占蜕膜淋巴细胞的(36.3±6.5)%,足月未临产组蜕膜NK细胞占蜕膜淋巴细胞的(33.9±3.0)%,差异无统计学意义;足月临产组的蜕膜NK细胞表面CDl6的表达明显高于足月未临产组,两者分别为(8.9±1.1)%与(4.6±0.9)%(P<0.05);足月临产组的蜕膜CD4+CD25+T细胞含量明显小于足月未临产组CD4+CD25+T细胞的含量,两者分别为(4.5±0.7)%与(9.1±1.0)%(P<0.05)。结论:足月妊娠分娩发动前、后蜕膜中的NK细胞及CD4+CD25+T细胞发生变化,推测NK细胞与CD4+CD25+T细胞可能参与了分娩发动。     

子痫前期患者CD4~+CD25~+Foxp~(3+)调节性T细胞检测及意义

目的:研究CD4+CD25+Foxp3+调节性T细胞在子痫前期患者(PE)外周血中的比例变化,探讨其在子痫前期发病中意义。方法:采用细胞内染色的流式细胞术检测22例子痫前期患者外周血中CD4+CD25high和CD4+CD25+Foxp3+的表达,并与正常妊娠和正常育龄妇女进行比较。结果:子痫前期患者外周血单个核细胞(PBMCS)CD4+T细胞中CD25high细胞明显低于正常妊娠和正常育龄妇女,CD4+CD25+Foxp3+的表达显著降低,而且其CD4+CD25+Foxp3+的表达与平均动脉压呈负相关。结论:子痫前期患者CD4+CD25+Foxp3+的表达明显减少,表明调节性T细胞的降低可能打破了母胎之间的耐受,参与了子痫前期的病理进程。     

调节性T细胞在大鼠TNBS诱发实验性结肠炎中作用的研究

目的　探讨CD4+ CD2 5+ 和CD8+ CD2 8-调节性T细胞在TNBS(2 ,4,6-三硝基苯磺酸 )诱发的大鼠实验性结肠炎的外周血、脾脏、结肠的改变及其作用。方法　建立TNBS实验性结肠炎大鼠模型 ,设对照组、建模后第一周和第三周三组 ,用流式细胞仪检测各组外周血、脾脏和结肠黏膜上皮细胞内单个核细胞中CD4+ CD2 5+ 和CD8+ CD2 8-调节性T细胞比例的变化。结果　成功建立TNBS大鼠实验性结肠炎模型 (n =15 )。结肠部位CD8+ CD2 8-细胞在建模后第一周时较对照组均明显增高 [(12 7± 5 4) %vs(3 87± 3 7) % ,P <0 0 1]。在外周血、脾和结肠中CD8+ CD2 8-T细胞比例在建模第三周时均较对照组明显增加 [外周血 :(14 4± 5 5 ) %vs(6 5± 4 6) % ,脾脏 :(18 7± 4 9) %vs(7 2± 5 7) % ,结肠 :(16 3± 4 9) %vs(3 87± 3 7) % ,P <0 0 1] ,其中以结肠部位增加最高 ,同其它两部位比较有统计学差异 (2 8± 0 6vs 1 1± 0 4,2 8± 0 6vs 1 5± 0 4,P <0 0 5 )。在第一周 ,CD4+ CD2 5+ T细胞在结肠部位较对照组增加 [(13 6± 6 1)vs(5 7± 4 2 ) ,P <0 0 5 ] ,于第三周回落至对照组水平。结论　CD4+ CD2 5+ 和CD8+ CD2 8-T细胞在TNBS实验性结肠炎大鼠模型中较正常对照组有明显增加 ,但增加的部位和时间点     

CD4+T辅助细胞与常见自身免疫性疾病

CD4辅助性T细胞(T help cell/ Th)作为T细胞中的一个重要群体因分泌的细胞因子不同而被分为多个亚群,各个Th细胞亚群在自身免疫疾病发病中的作用在近十年中得到了广泛的研究及肯定.本文就Th细胞各亚群与自身免疫性疾病关系做一概述.