CD4+CD25+T调节细胞的研究进展

CD4 CD25 TH细胞通过抗原特异性方式或细胞接触的方式抑制自身反应性T细胞的活化,能有效地维持自身免疫耐受,是调节自身反应性T细胞和防止自身免疫病发生的重要调节细胞。     

CD4+CD25+调节性T细胞在自身免疫病中作用的研究进展

CD4 CD25 调节性T细胞具有独特的免疫抑制功能,通过细胞接触和细胞因子机制抑制自身反应性T细胞的活化与增殖,在自身免疫病中发挥着重要作用。通过研究CD4 CD25 调节性T细胞在自身免疫病中的作用,将会揭示这类疾病的发病机制,从而为治疗自身免疫病提供一个新途径。     

CD4+CD25+调节性T细胞研究进展

CD4+CD25+调节性T细胞是调节性T细胞的亚群之一,主要来源于胸腺,具有多种独特的特征,包括可识别自身抗原肽、分泌抑制性细胞因子等.其功能是通过抑制自身反应性T细胞的免疫反应、抑制传统T细胞的活化以及促进一些抑制性细胞因子的分泌等,在维持机体内环境的稳定、肿瘤免疫监测、诱导移植耐受以及自身免疫性疾病的发生中发挥重要作用.     

CD4＋CD25＋调节性T细胞与自身免疫性肝病研究进展

调节性T细胞(regulatory T cell,Tregs)是体内具有免疫抑制功能的异质性细胞群,对维持免疫系统稳态起重要作用.     

CD4^＋CD25^＋T调节细胞的研究进展

CD4^ CD25^ TR细胞通过抗原特异性方式或细胞接触的方式抑制自身反应性T细胞的活化，能有效地维持自身免疫耐受，是调节自身反应性T细胞和防止自身免疫病发生的重要调节细胞。     

CD4+ CD25+调节性T细胞在流产中的研究进展

CD4+CD25+调节性T细胞(Tr)是一个具有独特免疫调节功能的T细胞亚群.Tr免疫学特性主要在于抑制自身反应性T细胞的活化,并参与外周免疫耐受,对维持机体内环境的稳定起重要作用.Tr在流产中发挥重要的免疫调节作用.     

CD4+CD25+调节性T细胞在自身免疫性疾病中的研究进展

调节性T细胞(regulation T cells,简称Treg)是不同于Th1和Th2的具有调节功能的T细胞群体,在多种免疫性疾病中起重要调节作用.根据其表面标记、分泌的细胞因子及其作用机制不同,Treg可分为CD4 CD25 调节性T细胞(CD4 CD25 Treg)、Tr1和Tr3等多种亚型.     

CD4+CD25+调节性T细胞与自身免疫耐受

Cd4+CD25+T细胞是一具有免疫调节(或免疫抑制)作用的细胞群.是健康个体T细胞库的组成成分,约占CD4+T细胞5%～15%.它可以通过细胞接触依赖机制和抑制性细胞因子依赖机制主动抑制自身免疫T细胞的活化,维持自身免疫耐受,防止自身免疫病的发生.对这一细胞群生物学作用的揭示,对自身免疫病、移植排斥、肿瘤、感染等方面的研究都具有重要意义.本文综述了CD4+CD25+T细胞群的产生、维持、效应机制及其在自身免疫耐受中的作用.     

CD4+CD25+调节性T细胞的胸腺发育机制

天然产生的CD4^＋CD25^＋调节性T细胞（Treg）细胞不仅是机体维持自身耐受的重要组成部分，而且在肿瘤免疫、抗感染免疫、免疫病理、移植物耐受、阻止自身免疫反应和维持机体免疫平衡等方面都具有重要意义。近年来关于发育机制的研究初露端倪，对这些细胞产生的组织定位、相互作用的细胞、参与发育的信号分子等都有较迅速的进展。对上述问题的了解，不仅有利于对Treg细胞本身的研究，同时，对于Treg细胞相关疾病的发病机制和防治研究也具有重要的理论意义和应用前景。     

CD4+CD25+调节性T细胞抑制小鼠自身免疫性甲状腺炎的发生

目的：研究CD4^ CD25^ Treg细胞对诱导小鼠实验性自身免疫性甲状腺炎(EAT)的影响。方法：磁性细胞分离器(MACS)分离CD4^ CD25^ T细胞，通过体外细胞增殖试验和IFN-γ的测定研究CD4^ CD25^ T细胞对CD4^ CD25^ T细胞的免疫抑制作用，同时通过过继转移试验研究CD4^ CD25^ T细胞抑制小鼠EAT的发生。结果：MACS分离的CD4^ CD25^ T细胞纯度可达到85％～94％，特异性表达FoxP3基因，体外能明显抑制效应性T细胞的增殖和IFN-γ的产生；将CD4^ CD25^ T细胞与病理性CD25^ T细胞共同注射正常小鼠，可抑制病理性T细胞诱导EAT的发生。结论：CD4^ CD25^ Treg细胞在体内外具有明显抑制效应性T细胞的功能。     

CD4~+CD25~+调节性T细胞在自身免疫性甲状腺疾病中数量和功能变化

目的:探讨自身免疫性甲状腺疾病患者外周血中CD4+CD25+调节性T细胞(Tregs)的数量和功能变化。方法:采用化学发光法测定20例初发Graves’病人、20例初发桥本甲状腺炎(HT)患者及20例健康体检者血清中促甲状腺素(TSH)、总三碘甲状腺原氨酸(TT3)、总甲状腺素(TT4)、甲状腺球蛋白抗体(TgAb)和甲状腺过氧化酶抗体(TPOAb)的水平;用流式细胞仪分析外周血单个核细胞(PBMC)中CD4+T细胞及CD4+CD25+Tregs的数量;采用磁珠分选技术分选5例HT病人和5例健康体检者PBMC中CD4+CD25+Tregs和CD4+CD25-T细胞,采用MTT法检测CD4+CD25+Tregs对自身CD4+CD25-T细胞增殖的抑制作用;提取各组PBMC的总RNA,经Real time-PCR检测TGFβ-1、Foxp3 mRNA的表达水平。结果:流式细胞检测结果显示,初发Graves’病人、初发HT患者外周血PBMC中CD4+T细胞数量与正常人比较无差异(P<0.05);初发HT患者外周血PBMC中CD4+CD25+Tregs占CD4+T细胞的比率为(1.55%±0.49%),明显低于正常对照组(2.86%±1.04%)(P<0.05);初发Graves’病人外周血PBMC中CD4+CD25+Tregs占CD4+T细胞的比率为(3.25%±0.97%),与正常对照组(2.86%±1.04%)相比无显著性差异(P<0.05)。MTT结果显示,初发HT患者CD4+CD25+Tregs对自身CD4+CD25-T细胞增殖的抑制百分率为15.7%±5.36%,与正常组(41.7%±9.87%)相比显著降低(P<0.05)。Real time-PCR结果显示,初发Graves’病人、初发HT患者PBMC的TGFβ-1 mRNA表达水平分别为(0.37±0.10)和(0.43±0.09),均明显低于正常对照组(1.02±0.04)(P<0.05);初发Graves’病人、初发HT患者PBMC的Foxp3 mRNA表达水平分别为0.62±0.09和0.42±0.29,均明显低于正常对照组(0.99±0.17)(P<0.05)。结论:本研究结果提示,HT患者外周血中CD4+CD25+Tregs的数量和功能明显降低。Graves’病和HT患者外周血PBMC中TGFβ-1、Foxp3 mRNA表达水平明显降低。     

CD4+CD25high regulatory T cells in human autoimmune diabetes

In mouse models, CD4+CD25+ T cells are involved in maintenance of peripheral tolerance. In humans, a subset of CD4+CD25+ T cells expressing high levels of CD25 (CD4+CD25high) with characteristics identical to murine CD4+CD25+ was recently described. We evaluated the characteristics of CD4+CD25high T cells in peripheral blood of type 1 diabetic subjects (T1D) and normal controls (NC). In contrast to a previous report, we found no difference in the number of CD4+CD25high and CD4+CD25+ T cells between T1D and NC. We confirmed previous studies that demonstrated that human CD4+CD25high cells can suppress the proliferation of co-cultured CD4+CD25- cells stimulated in conditions of sub-maximal cross-linking by anti-CD3 either with or without anti-CD28. However, we did not observe statistical differences between the normal controls and the chronic diabetic subjects we tested. Culturing of these cell populations did not appear to affect their ability to suppress proliferation in both groups. In conclusion, we found no significant differences in number or in vitro regulatory function of CD4+CD25high in chronic human T1D subjects.     

自身免疫性肝炎CD4+CD25+high调节性T细胞的研究

目的探讨CD4^＋CD25^＋high调节性T细胞（Tr）在自身免疫性肝炎（AIH）发病中的作用。方法用流式细胞仪技术比较分析AIH患者16例、慢性乙型肝炎（CHB）22例及键康正常人20例外周血中的CD4^＋CD25^＋high细胞，同时用免疫组织化学法检测AIH和CHB患者肝组织Foxp3的表达情况。结果AIH组外周血中CD4^＋CD25^＋high／CD4^＋百分比显著低于正常组（P〈0、05）和CHB组（P〈O．01），并且CHB组显著高于正常组（P〈0．05）；同时AIH组外周血中CD4^＋ T细胞也显著高于CHB组（P〈0．01））；肝组织Foxp3^＋细胞主要分布于肝小叶内窦周隙、汇管区，AIH组肝组织Foxp3^＋表达显著低于CHB组（P〈0．01）。结论CD4^＋CD25^＋high Tr细胞下降可能是自身免疫性肝炎发病的原因之一。     

Neonatal autoimmune disease: influence of CD4+ CD25+ regulatory T cells

Although previous studies have emphasized the tolerogenic property of murine neonatal immune system, recent studies indicate that neonatal mice are prone to autoimmune disease. This chapter will summarize the evidence for neonatal propensity to autoimmune ovarian disease (AOD) and describe the new finding that autoantibody can trigger a T cell-dependent autoimmune disease in neonatal but not adult mice. Based on depletion or addition of the CD4+ CD25+ T cells, disease resistance of older mice is explicable by the emergence of CD4+ CD25+ regulatory T-cell function after day 5, whereas disease susceptibility is associated with resistance to regulation by CD4+ CD25+ T cells.     

Human CD4+CD25+ regulatory T cells

In this report, we review studies of human CD4+CD25+ regulatory T cells (T-reg). Although lagging a few years behind the discovery of these cells in the mouse, the equivalent population of CD4+CD25+ regulatory T cells has also been isolated from human peripheral blood, thymus, lymph nodes and cord blood. In general, the characteristics of this T cell subset are strikingly similar between mouse and man. In the recent explosion of research reports on human CD4+CD25+ cells, although the majority of the characteristics ascribed to these cells appear to be consistent, contrasting results have been found primarily in regards to potential involvement of TGFbeta and production of IL-10. One explanation for this variability may reside in the fact that markedly different techniques are used to isolate human CD4+CD25+ T-reg cells and thus may result in the comparison of T-reg populations that differ in cellular composition and/or activation state. Another potential explanation for differences in human T-reg function may rest on the extreme variability of the culture conditions and TCR stimuli that have been used to test the functional properties of these cells in vitro. The strength of the TCR signal provided to the culture greatly affects the functional outcome of the co-culture and can result in the difference between suppression and full activation. Surprisingly, it appears that stronger stimulation has a greater and more rapid effect on the T-resp cell than on the T-reg cell as it causes T-resp cells to quickly become resistant to suppression. Thus, the details of in vitro culture conditions may at least partially account for disparate findings in regard to the functional characterization of human CD4+CD25+ cells. Here we review the evidence regarding the identification of human CD4+CD25+ regulatory T cells and their possible mechanism(s) of function.     

CD4+CD25+调节T细胞在免疫耐受及自身免疫病中的作用

越来越多的研究表明调节T细胞是外周免疫耐受的关键。CD4^＋CD25^＋调节T细胞在免疫耐受、自身免疫病、移植、肿瘤等方面均有着极其重要的作用,并需要TGF-β参与。在很多自身免疫性疾病如SLE、炎症性肠病中,CD4^＋CD25^＋调节T细胞的数量和,或功能存在显著异常,且多与疾病活动正相关。通过对自身免疫病外周血T细胞亚群进行修饰再自体回输可能是治疗这类疾病新的突破。     

CD4+CD25+ regulatory T cells in systemic sclerosis and other rheumatic diseases

Systemic sclerosis (SSc) is a generalized connective tissue disorder, characterized by a wide spectrum of microvascular and immunological abnormalities, leading to a progressive thickening and fibrosis of the skin and other organs, such as the lungs, GI tract, heart and kidneys. SSc is thought to be an autoimmune disease owing to the presence of high affinity antibodies and possible clinical overlap with other autoimmune diseases such as systemic lupus erythematosus and rheumatoid arthritis. Autoimmune diseases arise because of a breakdown in immunological self tolerance. Self tolerance is maintained via multiple regulatory mechanisms within the immune system, including the thymic deletion of self-reactive T cells and mechanisms of peripheral tolerance. In recent years, the presence of CD4(+)CD25(+)FOXP3(+) Tregs has been identified as a major mechanism of peripheral tolerance, and accumulating evidence indicates that alterations in Treg frequencies and/or function may contribute to autoimmune diseases. Here, we will review recent data on the percentage, function and phenotype of CD4(+)CD25(+) Tregs in rheumatic disease, and discuss how recent developments may guide research in this area in SSc.     

CD4+ CD25+调节性T细胞在肾脏疾病中的作用

CD4+ CD25+ 调节性T细胞(Tr)是一个具有独立功能的T细胞亚群,是机体维持自身免疫耐受的重要组成部分,在免疫病理、移植物耐受、阻止自身免疫反应和维持机体免疫平衡方面都有一定作用,其T细胞亚群在多种免疫性疾病中发挥重要的调节作用,但国内外有关该群细胞在肾脏疾病中作用的报道较少.