丙二酸次氮酰胺对刀豆蛋白刺激的胶原性关节炎模型大鼠CD4~+CD25~+调节性T淋巴细胞体外分化的影响

目的:研究来氟米特活性代谢物丙二酸次氮酰胺(A771726)对刀豆蛋白(ConA)刺激的胶原性关节炎(CIA)模型大鼠CD4+CD25+调节性T淋巴细胞(CD4+CD25+Tregs)体外分化的影响及其治疗类风湿性关节炎的作用机制。方法:取大鼠分为正常对照组和CIA模型组,建模后制备脾淋巴细胞悬液,再分为正常组、模型组和A771726低、中、高剂量(0.1、1、10μmol·L-1)组,各组加入ConA刺激和相应药物培养液培养48h后,以MTT法检测各组脾淋巴细胞增殖情况,流式细胞术检测各组CD4+CD25+Tregs占CD4+T淋巴细胞的比例;反转录-聚合酶链式反应检测各组CD4+CD25+Tregs特异性标志物Foxp3和转化生长因子β(TGF-β)mRNA表达情况;酶联免疫吸附测定法检测各组TGF-β浓度。结果:与正常组比较,模型组脾淋巴细胞增殖明显升高(P<0.01),CD4+CD25+Tregs占CD4+T淋巴细胞的比例、Foxp3和TGF-βmRNA表达、TGF-β浓度均明显降低(P<0.05);与模型组比较,A7717263个剂量组脾淋巴细胞增殖明显降低(P<0.05或P<0.01),A771726高剂量组CD4+CD25+Tregs占CD4+T淋巴细胞的比例明显升高,A771726中、高剂量组Foxp3和TGF-βmRNA表达、TGF-β浓度均明显升高(P<0.05或P<0.01)。结论:A771726可抑制CIA模型大鼠脾淋巴细胞增殖,诱导CD4+CD25+Tregs的分化,其机制可能与上调TGF-β的表达和分泌有关。     

猪囊尾蚴病患者CD4~+ CD25~+调节性T细胞水平的变化

目的检测猪囊尾蚴病患者外周血中CD4+CD25+调节性T淋巴细胞及其FOXP3的表达情况,探讨CD4+CD25+调节性T淋巴细胞在猪囊尾蚴感染中的免疫调控作用及意义。方法采用流式细胞仪检测11例猪囊尾蚴病患者外周血中CD4+CD25+T淋巴细胞的含量,同时观察CD4+CD25+T细胞中表达FOXP3群体的百分含量。结果囊尾蚴病患者外周血中CD4+CD25+T淋巴细胞的百分含量为6.11%,较正常人(3.94%)明显升高(P<0.05);患者外周血中CD4+CD25+T细胞表达FOXP3的细胞百分含量为15.67%,与正常对照组(11.09%)有显著性差异(P<0.05)。结论猪囊尾蚴病患者外周血中CD4+CD25+T淋巴细胞的百分含量显著升高,表明CD4+CD25+调节性T细胞可能参与猪囊尾蚴感染的免疫抑制。     

雷帕霉素诱导大鼠体内CD4+CD25+FoxP3+调节性T细胞的增殖

目的 探讨雷帕霉素(RPM)对大鼠CD4+CD25+FoxP3调节性T细胞的影响.方法 大鼠20只随机均分为两组:实验组RPM 2 mg·kg-1·d-1灌胃2周;对照组用生理盐水替代.无菌件下下腔静脉采血,并分离脾脏及胸腺,制备单个核细胞悬液.采用流式细胞术检测大鼠外周血、脾脏及胸腺内CD4+CD25+T细胞的占单个核细胞的比例,实时定量-PCR检测脾脏细胞FoxP3 mRNA表达,ELISA检测外周血血清转化生长因子β(TGF-13)和白细胞介素10(IL-10)含量.结果 实验组外周血、脾脏和胸腺中CD4+CD25+T细胞的比例明显高于对照组(P＜0.05).实验组大鼠脾脏细胞FoxP3 mRNA表达为对照组的4.1倍.实验组TGF-β和IL-10显著高于对照组(P＜0.05).结论 RPM能诱导大鼠体内CD4+CD25+FoxP3+调节性T细胞增殖,且增加体内免疫抑制性细胞因子TGF-β和IL-10的分泌.     

原发性肾病综合征患儿CD4+CD2 5+调节性T细胞的变化及临床意义

目的 探讨原发性肾病综合征(PNS)患儿外周血淋巴细胞亚群及CD4+CD25+调节性T细胞的变化及其临床意义.方法 采用流式细胞术检测23例PNS(肾病组)患儿外周血T淋巴细胞亚群,同时检测17例健康儿童作为对照组.结果 PNS患儿外周血中CD4+CD25+淋巴细胞较正常对照组明显升高(P＜0.05).结论 体内异常的CD4+CD25+调节性T细胞水平参与了PNS的发病过程.PNS患儿存在细胞免疫功能紊乱,纠正或调节细胞免疫功能可应用于PNS的临床治疗.     

肺癌患者外周血CD4+CD25+调节性T细胞的检测及其临床意义

目的 探讨检测肺癌患者手术前后外周血CD4+CD25+调节性T细胞的临床意义.方法 原发性肺癌患者43例(肺癌组),健康体检者20例(健康对照组).应用流式细胞术检测其外周血CD4+CD25+调节性T细胞的水平.结果 肺癌组患者手术前外周血CD4+CD25+调节性T细胞表达高于健康对照组(P<0.01);肺癌组患者术后30 d时外周血CD4+CD25+调节性T细胞水平较术前明显下降(P<0.05).结论 肺癌患者外周血CD4+CD25+调节性T细胞的水平增高;肺癌患者术后外周血CD4+CD25+调节性T细胞的水平下调,提示术后机体抗肿瘤免疫功能有了一定程度恢复.     

满药赤雹根总皂苷对Ⅱ型胶原性关节炎大鼠脾组织中CD3~+、CD4~+和CD8~+表达的影响

目的:研究满药赤雹根总皂苷(TSTR)对Ⅱ型胶原性关节炎(CIA)大鼠脾组织中T淋巴细胞亚群CD3~+、CD4~+和CD8~+表达的影响,探讨TSTR治疗类风湿性关节炎(RA)的机制。方法:随机取8只大鼠作为正常对照组(NC组),其余72只大鼠尾根部及背部多点注射牛Ⅱ型胶原蛋白与弗氏完全佐剂的混合剂复制CIA模型。将成模的50只大鼠随机分为模型组(MC组)、雷公藤多苷片(TG)组(12 mg/kg,阳性对照)和TSTR低、中、高剂量组(20、40、80 mg/kg),每组10只。给药组大鼠连续ig给药35 d,每天1次;NC组和MC组大鼠ig等体积蒸馏水。测定大鼠踝关节肿胀度,计算大鼠关节炎指数,苏木精-伊红染色后观察大鼠滑膜组织病变,免疫组化法检测大鼠脾组织中CD3+、CD4~+和CD8~+表达。结果:给药35 d后,MC组大鼠的踝关节肿胀度、关节炎指数和脾组织中CD4~+表达及CD4~+/CD8~+比值均显著高于NC组(P<0.05或P<0.01),CD3~+、CD8~+表达显著低于NC组(P<0.05);滑膜组织出现充血及大量炎症细胞浸润。各给药组大鼠的踝关节肿胀度、关节炎指数、脾组织中CD4~+表达及CD4~+/CD8~+比值均显著低于MC组(P<0.05),脾组织中CD3~+、CD8~+表达均显著高于MC组(P<0.05);TG组和TSTR中、高剂量组大鼠滑膜组织出现轻度充血及少量炎症细胞浸润,TSTR低剂量组大鼠滑膜组织未见明显充血或炎症细胞浸润。结论:上调脾组织中CD3~+、CD8~+的表达和下调脾组织中CD4~+的表达可能是TSTR治疗RA的作用机制之一;TSTR剂量为20 mg/kg时效果最好。     

探析系统性红斑狼疮患者CD4+CD25+调节性T细胞的变化

本文首先使用流式细胞术检测xx例SLE患者及XX名正常人,对照两个实验组的外周血中CD4+CD25+调节性T细胞和CD4+CD25+T细胞占CD4+T细胞的比率,深入分析CD4+CD25+调节性T细胞与SLE之间的关系,通过对照实现发现活动性SLE患者外周血中CD4+CD25+调节性T细胞及CD4+CD25+T细胞比例低于正常人,而且与红斑狼疮的SLEDAI指数呈现负相关等实验结果。希望通过本文的研究能够更加清楚的了解系统性红斑狼疮患者CD4+CD25+调节性T细胞的变化以及与SLE发病之间的关系,从而为后期的临床研究治疗提供参考。     

TF3-H4对CD4~+CD25~+调节性T细胞和CD4~+CD25~-效应性T细胞早期活化的影响

目的观察1',2',3',7'-四氢茶黄素-3,3'-双没食子酸酯(TF3-H4)对CD4+CD25+调节性T细胞和CD4+CD25-效应性T细胞早期活化的影响,分析TF3-H4对两群功能相反的CD4+T细胞的作用。方法免疫磁珠分离BALB/c小鼠脾脏CD4+CD25+调节性T细胞和CD4+CD25-效应性T细胞,加入ConA或PDB,和TF3-H4共同孵育12 h后收集细胞,流式细胞仪分析细胞表面早期活化标志CD69的表达。结果在ConA和PDB的作用下,两群细胞早期活化标志CD69的表达均升高。TF3-H4(20 mg.L-1)不能抑制PKC激动剂PDB激活的CD4+CD25-效应性T细胞CD69的表达,却能抑制ConA激活的CD4+CD25-效应性T细胞CD69表达;同时,TF3-H4也能明显抑制ConA激活的CD4+CD25+调节性T细胞的CD69表达。结论茶黄素衍生物TF3-H4可能经由TCR活化途径的上游抑制CD4+CD25-效应性T细胞活化;TF3-H4对CD4+CD25+调节性T细胞和CD4+CD25-效应性T细胞早期活化的抑制作用,可能是该类化合物发挥抗炎、抗肿瘤作用的机制之一。     

CD4~+CD25~+调节性T细胞与寄生虫感染免疫的关系

CD4+CD25+调节性T细胞是一类具有免疫抑制性的T淋巴细胞亚群,在自身免疫疾病、移植免疫、肿瘤免疫和感染性疾病中起重要作用[1-4]。已有文献报道,寄生虫感染时,宿主的CD4+CD25+调节性T细胞增殖,在调节机体免受过度免疫病理损伤的过程中发挥着一定的作用[5-6],但是这种作用却不利于宿主有效地清除寄生虫。因此为了更好的认识CD4+CD25+调节性T细胞与寄生虫感染免疫之间的关系,本文就相关研究进展进行综述如下。     

过敏性紫癜患儿外周血CD4~+CD25~+CD127~-调节性T细胞表达及意义

目的探讨过敏性紫癜(schonlein-henoch purpura,HSP)患儿治疗前后外周血CD4+CD25+CD127-调节性T细胞的表达及其临床意义。方法采用免疫荧光流式细胞技术检测56例HSP患儿治疗前后及20例健康儿童外周血CD4+CD25+CD127-调节性T细胞的表达值。结果 HSP患儿治疗前CD4+CD25+CD127-调节性T细胞的表达值明显低于治疗后组和正常对照组(P<0.01),HSP治疗后组CD4+CD25+CD127-调节性T细胞表达值与正常对照组相比差异无统计学意义(P>0.05)。结论 HSP治疗前患儿外周血CD4+CD25+CD127-调节性T细胞的表达值较正常对照组明显降低,而在治疗有效后升高,说明调节性T细胞可能参与了HSP的发病和病情的发展。而CD4+CD25+CD127-Treg细胞水平的检测可作为对HSP患儿预后判断的一个有效指标。     

Dynamic Frequency of Blood CD4+CD25+ Regulatory T Cells in Rats with Collagen-induced Arthritis

CD4+CD25+ regulatory T cells (CD4+CD25+ Tregs) have been shown to play a regulatory or suppressive role in the immune response and are possibly relevant to the pathogenesis of autoimmune diseases. In the present study, we attempted to investigate the frequency of CD4+CD25+ Tregs in peripheral blood (PB) of collagen-induced arthritis (CIA) rats during the development of arthritis, to determine whether their frequency is involved in the immunoregulation of this disease. The results showed that normal rats had similar frequencies of CD4+CD25+ Tregs in PB during the experiment time, expressed as a percentage of CD4+CD25+Foxp3+ T cells among the CD4+ T lymphocyte population. In contrast, the frequency of CD4+CD25+Foxp3+ T cells in CIA rats was found to change during the development of arthritis. In CIA rats, there is a significant negative correlation between the frequency of CD4+CD25+Foxp3+ T cells and paw swelling (r=-0.786, p< 0.01). The relationship between the frequency of CD4+CD25+Foxp3+ T and immune activation was not found in normal rats. During the time course, the frequency of CD4+CD25+Foxp3+ T was lower in CIA rats than in normal ones. The data suggest that the frequency of PB CD4+CD25+ Tregs may be a promising marker for arthritis activity.     

外源性LTB4对CIA小鼠Treg/Th17脾细胞分化的作用

目的探讨外源性白三烯B4(LTB4)对胶原诱导型关节炎(collagen-induced arthritis,CIA)小鼠脾细胞调节性T细胞(Treg)和Th17细胞分化的调节,进一步阐明LTB4在类风湿关节炎(RA)发病中的作用机制。方法建立CIA小鼠模型,取造模d28的脾细胞,体外实验分析外源性LTB4对Treg和Th17细胞分化的影响。应用流式细胞术检测CD4+CD25+Foxp3+细胞的数量,荧光定量PCR技术检测调控Treg和Th17细胞分化的特异性转录因子Foxp3和RORγt的mRNA的表达,酶联免疫吸附(ELISA)方法检测培养细胞上清IL-17的含量。结果成功建立CIA小鼠模型;造模d28分离小鼠脾细胞,体外培养加入鸡Ⅱ型胶原(CⅡ)共同孵育,随着LTB4浓度增加(0.01、0.1、1μmol·L-1),CD4+CD25+Foxp3+细胞数量相应减少,Foxp3 mRNA的表达相应降低;相反,IL-17的含量相应增加,RORγt mRNA的表达相应升高。结论LTB4抑制CIA模型脾细胞Treg细胞的分化,促进Th17细胞的分化,提示LTB4在CIA发病过程中具有一定的促炎活性。     

来氟米特对胶原性关节炎大鼠T细胞漂移的影响

目的 探讨来氟米特对胶原性关节炎大鼠中Th1和Th2细胞漂移的影响.方法 建立胶原性关节炎模型;来氟米特2mg/kg灌胃给药;HE染色行膝关节滑膜病理学检查并评分;称重大鼠体重和脾脏重量,计算脾脏指数;RT-PCR法检测脾淋巴细胞中T-bet mRNA和GATA-3 mRNA的表达.ELISA法检测Con A刺激的脾淋巴细胞分泌Th1和Th2型细胞因子IFN-γ和IL-4的量.结果 与模型组比较,来氟米特(2mg/kg,灌胃给药15天)明显降低CIA大鼠病理组织学评分,降低脾脏指数.与关节炎模型组比较,药物干预组GATA-3 mRNA的表达增高、IL-4的分泌增多,T-bet mRNA的表达降低、IFN-γ的分泌减少.结论 来氟米特对胶原性关节炎具有治疗作用,该作用可能和维持T细胞亚群的平衡有关.     

CD4+CD25+Foxp3+ T cells contribute to the antiasthmatic effects of Astragalus membranaceus extract in a rat model of asthma

Astragalus membranaceus (AM), a traditional Chinese medicinal herb, has been widely used for centuries to treat asthma in China. Previous studies demonstrated that AM had inhibitory effects on airway hyperresponsiveness, inflammation and airway remodeling in murine models of asthma. However, it remained unclear whether the beneficial effects of AM on asthma were associated with CD4⁺CD25⁺Foxp3⁺ Treg cells; this issue is the focus of the present work. An asthma model was established in Sprague–Dawley (SD) rats that were sensitized and challenged with ovalbumin. Bronchoalveolar lavage fluid (BALF) was assessed for inflammatory cell counts and cytokine levels. Airway hyperresponsiveness was detected by direct airway resistance analysis. Lung tissues were examined for cell infiltration, mucus hypersecretion and airway remodeling. CD4⁺CD25⁺Foxp3⁺ Treg cells in the BALF and Foxp3 mRNA expression in lung tissues were examined. The oral administration of AM significantly reduced airway hyperresponsiveness to aerosolized methacholine and inhibited eosinophil counts and reduced IL-4, IL-5 and IL-13 levels and increased INF-γ levels in the BALF. Histological studies showed that AM markedly decreased inflammatory infiltration, mucus secretion and collagen deposition in the lung tissues. Notably, AM significantly increased population of CD4⁺CD25⁺Foxp3⁺ Treg cells and promoted Foxp3⁺ mRNA expression in a rat model of asthma. Together, these results suggest that the antiasthmatic effects of AM are at least partially associated with CD4⁺CD25⁺Foxp3⁺ Tregs.     

Curcumin inhibits suppressive capacity of naturally occurring CD4+CD25+ regulatory T cells in mice in vitro

Accumulating evidence has demonstrated that naturally occurring CD4(+)CD25(+) regulatory T cells (Tregs) are critical for maintenance of immunological tolerance and have been shown to be important in regulating the immune responses in many diseases. Curcumin, a phytochemical obtained from the rhizome of the plant Curcuma longa, has achieved the potential therapeutic interest to numerous immune-related disorders. However, the effect and mechanism of curcumin on Tregs remain largely elusive. In the present study, curcumin inhibition of the suppressive activity of CD4(+)CD25(+) regulatory T cells appears to be dependent on three categories: inhibiting cell-cell contact by down-regulation of CTLA-4, suppressing inhibitory cytokine secretion and decreasing the ability to consume IL-2 and/or suppress IL-2 production. In addition, Foxp3 expression was also reduced on Tregs after curcumin stimulation. Moreover, we found that nuclear translocation of p65 and c-Rel, which is critical for Foxp3 and CD25 expressions, was markedly decreased in Tregs with curcumin stimulation. Based on the role of curcumin in the suppressive activity of Tregs, it may be feasible to use curcumin as an immunotherapy for Treg-related diseases, such as tumors and sepsis.     

CD4+CD25+Foxp3+调节性T细胞与慢性乙型肝炎病毒感染的关系

目的 探讨调节性T细胞（Treg）在慢性乙型肝炎病毒感染中的免疫调节作用。方法 采用流式细胞术检测慢性活动性肝炎患者、乙型肝炎病毒携带者、乙型肝炎恢复者及健康对照者外周血CIN^＋T细胞中的CIN^＋CD25^＋Foxp3^＋调节性T细胞的比例。采用免疫组织化学法检测肝组织中Foxp3的表达。统计分析外周血中CIN^＋CD25^＋Foxp3^＋调节性T细胞的比例数与血清HBeAg和HBVDNA含量的关系。结果 外周血CIN^＋T细胞中CIN^＋CD25^＋Foxp3^＋调节性T细胞的比例数在慢性活动型肝炎组和乙型肝炎病毒携带组均高于健康对照组（P〈0．05），乙型肝炎病毒携带者组高于乙型肝炎恢复组（P〈0．05）。Foxp3在慢性活动型肝炎组肝组织中的阳性率和阳性细胞数均高于乙型肝炎病毒携带者组（P〈0．05）。外周血HBeAg（＋）患者Treg的比例数高于血清HBeAg（-）患者Treg的比例数（t=1．67．P〈0．05）。患者外周血CIN^＋CD25^＋Foxp3^＋Treg的比例数与血清HBV DNA含量呈正相关（r=0．56，P〈0．01）。结论 CIN^＋CD25^＋Foxp3^＋调节性T细胞可能与乙型肝炎病毒感染慢性化及乙型肝炎病毒的清除有关。     

CD4+CD25+调节性T细胞及Th17细胞与Graves病机制研究

目的：探讨CD4+CD25+调节性T细胞以及Th17细胞与Graves病的关系。方法：检测GD患者和对照组外周血单个核细胞CD4+CD25+Tregs、Th17细胞的数量,PBMC中TGF-β、IL-10和FoxP3 mRNA的表达水平以及血清TGF-β、IL-10和IL-17水平。结果：GD组外周血Th17数量高于对照组,血清中IL-17水平也高于对照组（P＜0.05）;而CD4+CD25+Tregs的数量低于对照组,而且TGF-β、FoxP3表达水平低于对照组（P＜0.05）;GD组血清中TGF-β、IL-10水平高于对照组（P＜0.05）。结论：CD4+CD25+Tregs数量的减少或功能障碍以及Th17细胞数量的升高,可能参与GD的发病过程。     

The effect of triptolide on CD4+ and CD8+ cells in Peyer's patch of SD rats with collagen induced arthritis

Triptolide is a purified component from a traditional Chinese herb Tripterygium wilfordii Hook F. It has been shown to have anti-inflammatory and immunosuppressive activities by its inhibitory effect on T cells. But the effect of triptolide on Peyer's patch cells is unknown. Enteric mucosal immune system, including Peyer's patch, is regarded as one of the sites for inducing immunity tolerance, and this intolerance effect has been used to induce oral tolerance which can considerably reduce arthritis severity in several models of experimental polyarthritis and RA patients. In this study, we investigated the effect of triptolide on the Peyer's patch cells and peripheral lymphocytes in collagen induced arthritis (CIA) in rats. CIA in rat is a widely studied animal model of inflammatory polyarthritis with similarities to rheumatoid arthritis (RA). Our data show that triptolide could lower the arthritic scores and delay the onset of CIA. There are more Peyer's patches in triptolide treated rats than in control rats, while there is no difference in Peyer's patch numbers between CIA rats and triptolide treated rats. In the Peyer's patch, more CD4+ cells are observed in CIA rats, and the numbers of CD4+ cells in triptolide treated rats and control rats are similar. While more CD8+ cells are observed in triptolide treated rats, and the numbers of CD8+ cells in CIA rats and control rats are similar. In periphery, more CD4+ cells and less CD4+ cells in CIA rats and triptolide treated rats are respectively observed. Therefore, the regulation on Peyer's patch might explain some of the immunosuppressive activities of triptolide, and enteric immune response might be actively involved in CIA pathogenesis. It is suggested that the Peyer's patch is one of the primary targets of the immunosuppressive activity of triptolide.     

乙型肝炎患者CD4+CD25+节性T细胞的分子表达研究

目的 研究慢性乙型肝炎(chronic hepatitisB,CHB)患者和乙型肝炎病毒携带者(asymptomatic HBV carriers,ASC)外周血CD4+CD25+调节性T细胞(CD4+CD25+regulatory T cells,Tregs)4个重要分子[细胞间黏附分子-1(ICAM-1),神经纤毛蛋白-1 (Neuropilin-1),Toll样受体TLRS、TLR8]的表达情况,并分析其可能的作用.方法 收集50例CHB患者(CHB组)、28例ASC(ASC组)和24例健康献血者(NC组)的外周静脉血,密度梯度离心法分离外周血单个核细胞,应用MACS免疫磁殊和AutoMACS分离系统分选CD4+CD25+ Tregs,提取CD4+CD25+ Tregs总RNA,逆转录成cDNA后,采用SYBR Green Ⅰ荧光标记技术进行定量PCR检测待测分子的表达水平.结果 荧光定量PCR结果显示,4个待测分子中,ICAM-1、Neuropilin-1、TLR5的表达水平在各研究组间差异均无统计学意义(P＞0.05);TLR8在ASC组外周血CD4+CD25+Tregs中的表达水平明显低于NC组和CHB组,差异有统计学意义(P＞0.05),TLR8的表达水平在CHB组和NC组间差异无统计学意义(P＞0.05).结论 荧光定量PCR显示TLR8的表达水平在各组之间存在明显差异,提示TLR8在HBV感染过程中可能对外周血CD4+CD25+Tregs的功能起着重要的调控作用.