慢性乙型肝炎患者外周血中T淋巴细胞亚群和CD4~+CD25~+调节性T淋巴细胞的表达水平与HBV DNA定量的相关分析

目的探讨慢性乙型肝炎(CHB)患者外周血中T淋巴细胞亚群(CD3+T、CD4+T、CD8+T、CD4+/CD8+T)和CD4+CD25+调节性T淋巴细胞(Treg)表达水平与HBV DNA定量的相关性。方法选取2012年7月-12月在兰州市第二人民医院就诊的175例HBV感染者作为研究对象,分为CHB组(63例)、HBV携带者(ASC组)(112例),以同期50例健康体检者作为对照组。采用流式细胞术检测3组患者血清中的CD3+T、CD4+T、CD8+T、CD4+T/CD8+T和CD4+CD25+Treg表达水平,实时荧光定量PCR法检测HBV DNA载量。多组间均数比较采用方差分析,进一步两两比较采用LSD-t检验,计数资料组间比较采用χ2检验;采用Pearson进行相关性分析。结果 CHB患者外周血CD4+CD25+Treg表达水平(30.97±18.78)%显著高于对照组(27.30±17.59)%,差异具有统计学意义(P0.05);与对照组相比,CHB组、ASC组的CD3+T、CD4+T淋巴细胞百分数和CD4+与CD8+T淋巴细胞百分数比值显著降低,差异均有统计学意义(P值均0.05),CD8+T淋巴细胞百分数显著升高,差异均有统计学意义(P值均0.05);ASC组和CHB组CD4+CD25+Treg表达水平与HBV DNA呈正相关(r值分别为0.501、0.682,P值均0.01)。结论 HBV感染者存在T淋巴细胞亚群比例异常,HBV DNA可以促进CD4+CD25+Treg表达水平升高,说明CD4+CD25+Treg和CD4+与CD8+T淋巴细胞比例失衡在乙型肝炎慢性化过程中发挥重要作用。     

乙型肝炎病毒感染不同阶段患者外周血CD4+CD25+调节性T细胞的测定

目的 测定HBV感染不同阶段患者外周血CD4+CD25+调节性T细胞(Treg)的频率及标记分子,并分析其与临床指标的相关性.方法 采集79例慢性乙型肝炎(CHB)、12例急性乙型肝炎(AHB)患者、26例无症状HBV携带者(ASC)和20例健康对照的外周血,流式细胞仪分析Treg频率、Treg细胞表面和胞内特征性分子的表达.普通RT-PCR和相对荧光定量PCR测定叉头/翼状转录因子3(Foxp3)在CD25+Treg细胞的表达水平.所有患者及健康对照均经ELISA检测HBV血清标记物水平,实时荧光定量PCR测定血清HBV DNA载量,并进行肝功能检测.结果 总CD4+CD25+T细胞占外周血CD4+T细胞的比率,在各患者组和健康对照组之间差异均无统计学意义(P＞0.05).HBeAg阳性CHB组CD4+CD25高表达T细胞频率(3.42%±0.81%)与HBeAg阴性CHB组(3.19%±0.67%)、ASC组(3.05%±0.64%)比较,差异无统计学意义(均P＞0.05),但明显高于健康对照组(2.72%±0.71%,P=0.034)和AHB组(2.25%±0.54%,P=0.013).CD4+CD25高表达T细胞表面高表达CD45RO、CD25分子,低表达CD45RA,细胞内高表达细胞毒性T淋巴细胞相关抗原-4(CTLA-4)和Foxp3.各患者组及健康对照组Treg中Foxp3表达水平的差异无统计学意义(P＞0.05).CHB组患者的Treg频率与血清病毒载量呈正相关(r=0.48,P=0.018).结论 Treg可能通过抑制T细胞免疫应答反应而影响病毒清除,并与CHB患者的持续感染密切相关.     

乙型肝炎患者外周血CD4+ CD25+调节性T细胞表型与功能分析

目的 观察急、慢性乙型肝炎(AHB、CHB)患者外周血CD4+CD25 high调节性T细胞(Treg)的频率、表型和功能特点.方法 采集16例AHB急性发病期(发病后第1周)患者、72例CHB患者和32例健康人的外周血,检测Treg频率,并分析其表面CD45RO、CD45RA、HLA-DR、CD95和细胞内细胞毒T淋巴细胞相关抗原4(CTLA-4)的表达水平.应用实时荧光定量RT-PCR检测CD4+ CD25+、CD4+ CD25-、CD4+和CD4-等细胞亚群和外周血单个核细胞(PBMC)的FoxP3 mRNA表达量.通过MACS免疫磁珠分选Treg,并应用[3H]掺入法检测Treg抑制抗-CD3抗体和HBV抗原刺激的PBMC增殖能力,并观察Treg对HBV抗原或抗-CD3抗体刺激自体PBMC分泌IFNγ的影响.结果 CD4+CD25 high Treg高表达CD45RO、HLA-DR、CD95和细胞内CTLA-4,低表达CD45RA,并且较特异的高表达FoxP3 mRNA.乙型肝炎病人外周血Treg频率与健康对照(3.50±0.72)%比较无统计学差异,但CHB组(3.90±1.44)%显著高于AHB组(3.10±0.87)%,P＜0.05.Treg本身对于HBV抗原或抗-CD3抗体刺激没有明显的增殖反应和IFNγ分泌,但可抑制自体PBMC增殖和IFNγ分泌,其中对HBV抗原刺激引起的细胞反应抑制作用较强.结论 HBV感染者外周血Treg较特异地表达FoxP3分子,能抑制HBV抗原特异性细胞免疫反应,这对于深入阐明CHB发病机制具有重要意义.     

CD4+CD25+Foxp3+调节性T细胞在不同月龄小鼠中的变化及与肺癌关系

目的 探讨CD4+CD25+Foxp3+调节性T(Treg)细胞在衰老过程中的变化及与肺癌的关系.方法 建立Lewis肺癌模型,36只C57BL/6小鼠分成6组,青年健康组、中年健康组、老年健康组以及青年肿瘤组、中年肿瘤组、老年肿瘤组.通过流式细胞分析法测定6组小鼠脾脏细胞中CD4+CD25+Foxp3+Treg占CD4+T细胞的百分比来反映CD4+CD25+Foxp3+Treg细胞含量,通过实时荧光定量PCR法测定Foxp3mRNA的含量.结果 与健康组相比,肺肿瘤鼠脾脏中CD4+CD25+Foxp3+/CD4+T细胞和Foxp3 mRNA的含量明显增高(均P＜0.05);在健康组内,各年龄段CD4+CD25+Foxp3+/CD4+T细胞(F=47.70,P=0.000)和Foxp3mRNA(F=6.56,P=0.009)差异有统计学意义,老年鼠脾脏细胞中含有高数量的CD4+CD25+Foxp3+Treg细胞和Foxp3mRNA,最高组是老年肺肿瘤鼠.结论 CD4+CD25+Foxp3+Treg细胞和其功能基因Foxp3含量的改变与增龄和肺肿瘤的发生和发展存在密切的关系.

Abstract：

Objective To explore the change of CD4+CD25+Foxp3+ regulatory T (Treg) cells during aging and the relation with lung tumor. Methods The Lewis lung cancer model was set up in C57BL/6 female mice, and the 36 mice were divided into young health group, middle-aged health group, elderly health group, young tumor group, middle-aged tumor group and elderly tumor group. The percentages of CD4+CD25+Foxp3+ Treg in CD4+ T cells in mice spleen cells were measured by flow cytometry, for reflecting the quantity of CD4+CD25+Foxp3+ Treg cells. And the level of Foxp3 mRNA in splenocyte was tested by real-time PCR method. Results The level of CD4+CD25+Foxp3+/CD4+ T cells and the quantity of Foxp3 mRNA were higher in tumor groups than in healthy groups(both P＜0.05 ). Besides, in the healthy groups, there were statistical differences in the level of CD4+CD25+Foxp3+/CD4+ T cells (F=47.70, P=0.000) and the quantity of Foxp3 mRNA among the different months groups. Accumulation of the CD4+CD25+Foxp3+ Treg cells was accompanied with aging, the elderly mice contained a significantly larger population of CD4+CD25+Foxp3+ Treg cells in their spleen when compared with the younger counterparts, and the highest was the elderly tumor group. So it was with the functional gene Foxp3 mRNA (F=6.56, P=0.009). Conclusions The results suggest a close relationship of the change of CD4+CD25+Foxp3+Treg cells with aging and the genesis and development of lung tumor.     

CD4+白细胞介素-17+辅助性T细胞对香烟暴露小鼠肺部炎症及肺气肿的作用

目的 观察香烟烟雾暴露小鼠肺实质中CD4+白细胞介素(IL)-17+辅助性T细胞(Th17)数量及活性的表达,探讨其在香烟暴露小鼠肺部CD4+ γ-干扰素+(Th1)炎症及肺气肿中的作用及相关机制.方法 将40只雄性Balb/c小鼠按随机数字表法分为4组:对照12周(C12)组、对照24周(C24)组、烟雾暴露12周(S12)组、烟雾暴露24周(S24)组,每组10只.香烟烟雾暴露法建立小鼠肺气肿模型.HE染色观察小鼠肺气肿的改变,计算平均内衬间隔和肺泡破坏指数(DI);流式细胞术检测小鼠肺实质中CD4+IL-17+T(Th17)细胞、CD4+γ-干扰素+T(Th1)细胞、CD4+IL-17+γ-干扰素+T(Th17/Th1)细胞、CD8+γ-干扰素+T(Tc1)细胞、CD8+IL-21R+细胞及CD4+IL-17+IL-21+细胞比例;荧光定量PCR法检测小鼠肺实质中维甲酸相关孤独受体(RORγt)和IL-17的mRNA表达,并分析这些指标的相互关系.结果 S12组和S24组的平均内衬间隔[(39±4)μm和(47±7)μm]和DI(39.1±1.6和45.2±3.1)明显高于C12组[(32±4)μm和28.2±1.6]和C24组[(33±3)μm和28.9±2.1],且以S24组的增高更为明显,差异均有统计学意义(t值为4.378～15.188,均P＜0.05);S12组和S24组Th17细胞比例[(3.3±1.1)%和(7.2±2.2)%]均明显高于C12组和C24组[(1.8±0.8)%和(2.0±0.6)%];S12组和S24组RORγtmRNA表达量[(25±4)和(35±3)]及IL-17的mRNA表达量[(26±3)和(36±3)]亦明显高于C12组[(10±5)和(13±5)]和C24组[(11±7)和(8±6)],以S24组增高更为明显,差异均有统计学意义(P＜0.05);S12组和S24组Th1细胞比例[(10.0±3.7)%和(26.2 ±6.0)%]、Th17/Th1细胞比例[(0.61±0.30)%和(1.82±0.52)%]及Tc1细胞比例[(17.0±4.5)%和(26.8±8.5)%]均明显高于C12组[(3.8±1.7)%、(0.27±0.17)%和(4.8±1.9)%]和C24组[(4.2±1.3)%、(0.28±0.11)%和(5.2±1.0)%],以S24组增高更为明显,差异均有统计学意义(P＜0.05);S12组和S24组小鼠Th17细胞与Th1、Tc1细胞比例、平均内衬间隔、DI值均呈显著正相关(r值为0.519～0.797,均P＜0.01);Th17/Th1细胞比例与平均内衬间隔、DI值呈显著正相关(r值分别为0.742和0.802,均P＜0.01);S12组和S24组CD4+IL-17+IL-21+细胞比例[(0.19±0.04)和(0.55±0.24)]明显高于C12组和C24组[(0.07±0.03)和(0.08±0.03)],S24组增高更为明显,差异均有统计学意义(P＜0.05).S12组和S24组的CD8+IL-21R+细胞比例[(2.94±1.26)和(4.12±2.26)]高于C12组和C24组[(1.22±0.31)和(1.34±0.18)](P＞0.05);S12组及S24组小鼠CD4+IL-17+IL-21+细胞比例与Th1、Tc1细胞比例、平均内衬间隔和DI值均呈显著正相关(r值为0.694～0.754,均P＜0.05);S12及S24组小鼠CD8+IL-21R+细胞比例与平均内衬间隔和DI呈显著正相关(r值分别为0.516和0.725均P＜0.05).结论 香烟暴露导致肺气肿小鼠肺内Th17细胞数量及活性上调,并随烟雾暴露时间延长而增强;Th17细胞通过IL-21及IL-21R在肺部Th1/Tc1炎症中起重要促进作用;这对探讨COPD肺部炎症和肺气肿发生机制以及新的治疗靶点具有重要意义.

Abstract：

Objective To evaluate the expression and the role of Th 17 in cigarette smoke-induced lung inflammation and emphysema in mice.Methods Forty male BALB/c mice were randomly divided into 4 groups, including a control group C12, a control group C24, a smoke-exposure 12 week group (S12) and a smoke-exposure 24 week group S24 (n = 10 each).Morphological changes were evaluated by mean linear intercepts and destructive index (DI).The proportion of CD4+ IL-17 + Th17, CD4+ IFN-γ+ Th1, CD4+ IL-17 +IFN-γ+ T( Th17/ Th1 ), CD8+ IFN-γ+ Tc1, CD8+ IL-21R + and CD4+ IL-17 + IL-21 + T cells in lungs of mice was determined by flow cytometry.The mRNA expressions of RORγt and IL-17 were evaluated by real-time PCR.Results Mean linear intercepts and DI were significantly higher in S12 and S24 groups [(39 ± 4)μm, (47 ±7) μm], (39.1 ± 1.6, 45.2 ±3.1 ) as compared to C12[(32 ±4) μm,28.2 ± 1.6] and C24groups [(33 ± 3 ) μm ,28.9 ± 2.1], all P ＜ O.05.The percentage of Th17 of S12 and S24 groups [(3.3 ±1.1 )%, (7.2 ±2.2)%] was significantly increased as compared with that of C12 and C24 groups [( 1.8± 0.8) %, (2.0 ± 0.6) %], all P ＜ 0.05.The mRNA levels of RORγt [( 25 ± 4), ( 35 ± 3 )] and IL-17 [(26 ± 3), (36 ± 3 )] in S12 and S24 groups were higher than in C12 [(10 ± 5 ), (13 ± 5 )] and C24 groups [( 11 ± 7 ), (8 ± 6)], all P ＜ 0.05.The percentage of Th 1, Th17/Th1 and Tc1 cells of S12 and S24 groups [(10.0 ±3.7)%, (26.2 ±6.0)%], [(0.61 ±0.30)%, (1.82 ±0.52)%], [(17.0±4.5 ) %, ( 26.8 ± 8.5 ) %] was significantly increased as compared with that of C12 [( 3.8 ± 1.7 ) %,(0.27±0.17)%, (4.8 ±1.9)%] and C24 groups [(4.2±1.3)%, (0.28±0.11)%, (5.2±1.0)%], all P＜0.05.Moreover, the frequency of Th17 cells had a positive correlation with Th1, Tc1 cells and emphysematous lesions ( r =0.519 - 0.797, all P ＜ 0.01 ).In addition, a positive correlation between Th17/Th1 cells and emphysematous lesions was also found (r =0.742, 0.802, all P ＜0.01 ).The percentage of CD4+ IL-17+ IL-21 +T cells was significantly increased in S12 and S24 groups [(0.19 ±0.04) %, (0.55 ± 0.24) %] compared to controls [(0.07 ± 0.03 ) %, (0.08 ± 0.03 ) %], all P ＜ 0.05.Meanwhile, as compared with that of the controls [( 1.22 ± 0.31 ), ( 1.34 ± 0.18 )], the percentage of CD8+ IL-21 R + T cells was also increased in SI 2 and S24 groups [( 2.94 ± 1.26 ), (4.12 ± 2.26 )], but there were no differences among smoke-exposure groups ( P ＞0.05 ).The frequency of CD4+ IL-17 + IL-21 + T cells had a positive correlation with Th 1, Tc1 cells and emphysematous lesions (r = 0.694 -0.754, all P ＜0.05).And the frequency of CD8+ IL-21R+ T cells also had a positive correlation with emphysematous lesions ( r = 0.516, 0.725, all P ＜ 0.05).Conclusions Cigarette smoke increased the expression and the activity of Th17 in mice.Th17 may play a potential (active) role in the development of lung inflammation through IL-21/IL-21R pathway.     

CD4+CD25+调节性T淋巴细胞在大鼠肝纤维化模型中的变化

目的 探讨CD4+CD25+调节性T淋巴细胞(Tregs)在肝纤维化免疫发病机制中的作用.方法 26只大鼠分为对照组(6只)和模型组(20只),通过皮下注射四氯化碳(CCl4)建立肝纤维化模型,检测血清肝功能和纤维化指标,观察肝脏病理学变化,流式细胞仪测定外周血及脾脏CD4+CD25+Tregs数量的变化.两组间差异比较采用t检验,相关性采用Pearson直线相关分析.结果 模型组血清ALT、AST升高,Alb下降;HA、PC Ⅲ、Ⅳ C分别为(177.42±61.25)/μg/L、(34.86±7.47)μg/L、(7.32±3.71)μg/L,较对照组明显升高(t=-3.670、-5.661、-3.950,均P<0.01);模型组肝脏组织胶原纤维大量增生,分割肝小叶并包绕成假小叶.模型组外周血中CD4+CD25+Tregs占CD4+T淋巴细胞比例为(7.41±2.15)%,较对照组的(12.88±2.93)%低(t=3.752,P<0.01);模型组脾脏中Tregs为(9.49±1.16)%,较对照组的(13.16±2.36)%亦低(t=2.793,P<0.05).ALT、AST与外周血和脾脏中Tregs水平呈直线负相关(ALT、AST与外周血中Tregs:r分别为-0.727、-0.698,ALT、AST与脾脏中Tregs:r=-0.663、-0.535;均P<0.05);而Alb与外周血和脾脏中Tregs水平无直线相关(r=0.423、0.372,均P>0.05);HA、PCⅢ、ⅣC与外周血和脾脏中Tregs水平呈直线负相关(HA、PCⅢ、ⅣC与外周血中Tregs:r=-0.719、-0.558、-0.792,HA、PCⅢ、ⅣC与脾脏中Tregs:r=-0.424、-0.685、-0.506;均P<0.05).结论 CCl4诱导的大鼠肝纤维化模型CD4+CD25+Tregs的表达降低,其肝纤维化的免疫学发病机制有待进一步研究.

Abstract：

Objective To investigate the role of CD4+ CD25+ regulatory T lymphocyte(Tregs)in the immunological pathogenesis of liver fibrosis.Methods Twenty-six rats were divided into two groups:control group(6 rats)and model group(twenty rats).The rat model of liver fibrosis was induced bv subcutaneous injection of carbon tetrachloride(CCl4).The serums were collected for detection of hepatic function and fibrosis parameters.Hepatic tissue samples were used to observe the histopathological changes.The flow cytometry was used to detect the proportions of Tregs in both peripheral blood and spleen.The data were evaluated by t-test.The relationship between two variables was analyzed using Pearson linear correlation.Results The levels of serum alanine aminotransferase (ALT)and aspartate aminotransferase (AST) were significantly increased,but the level of serum albumin (Alb) was obviously decreased.The concentrations of serum hyaluronic acid (HA),procollagen type Ⅲ(PCⅢ),collagen type Ⅳ(CⅣ)of the model group increased to(177.42±61.25)μg/L,(34.86±7.47)μg/L and(7.32±3.71)μg/L,respectively,which were higher than those in the control group(t=-3.670,-5.661,-3.950,respectively;all P<0.01).In model group,hepatic lobules were full of collagen fibers and the hepatic pseudolobule formation was observed.The proportion of peripheral blood Tregs in CD4+ T lymphocyte in liver fibrosis model was(7.41±2.15)%,which was significantly lower than that in control group(12.88±2.93)%(t=3.752,P<0.01).Furthermore,the frequency of Tregs in spleen of the model group was(9.49±1.16)%,which was also significantly lower than that in control group(13.16±2.36)%(t=2.793,P<0.05).In addition,the levels of serum ALT,AST and fibrosis parameters were inverselv correlated with the frequency of Tregs in spleens and peripheral blood(ALT and Tregs in blood:r=-0.727,AST and Tregs in blood:r=-0.698,ALT and Tregs in spleen:r=-0.663,AST and Tregs in spleen:r=-0.535,HA and Tregs in blood:r=-0.719,PCⅢ and Tregs in blood:r=-0.558,CⅣ and Tregs in blood:r=-0.792,HA and Tregs in spleen:,r=-0.424,PCⅢ and Tregs in spleen:r=-0.685,CⅣ and Tregs in spleen:r=-0.506;all P<0.05).However,the linear correlations between serum Alb and Tregs in spleens and peripheral bloods were not observed(r=0.423,0.372,respectively,both P>0.05).Conclusion These findings suggest that the reduction of CD4+ CD25+ Tregs probably play an important role in the immunological pathogenesis of liver fibrosis.     

重症肌无力患者外周血CD4+T细胞功能的变化及相关机制

目的探讨重症肌无力(MG)患者外周血CD4~+T细胞功能的变化对其机制。方法抽取初治及治疗病情稳定的MG患者及同期入院进行健康体检者各20例的静脉血10 ml。流式细胞术(FCM)测定其外周血白细胞介素(IL)-17~+CD4~+T细胞、干扰素(IFN)-γ~+CD4~+T细胞、肿瘤坏死因子(TNF)-α~+CD4~+T细胞、IL-2~+CD4~+T细胞和CD4~+CD25high CD127~-Treg细胞比例。CD4~+T细胞与CD4~+CD25high CD127~- Treg细胞共孵育后,FCM术测定CD4 T细胞分泌IL-17、IFN-γ、TNF-α及IL-2变化情况。结果与对照组及治疗病情稳定的MG患者相比,初治MG患者外周血IL-17~+CD4~+T细胞、IFN-γ+CD4~+T细胞、TNF-α~+CD4~+T细胞、IL-2~+CD4~+T细胞比例均显著升高(P<0.05)。MG患者与HC外周血CD4~+Foxp3~+Treg细胞比例比较差异无统计学意义(P>0.05)。对照组外周血CD4~+CD25high CD127~-Treg细胞可显著抑制CD4 T细胞分泌IL-17、IFN-γ、TNF-α和IL-2,而MG患者外周血CD4~+CD25high CD127~-Treg细胞抑制CD4+TT细胞分分泌细胞因子的能力显著降低。结论 MG患者外周血CD4~+Foxp3~+Treg细胞功能的丧失,致使外周血CD4~+T细胞细胞因子分泌能力增强,从而导致MG的发生和发展。     

CD4+白细胞介素-17+辅助性T细胞对香烟暴露小鼠肺部炎症及肺气肿的作用

Objective To evaluate the expression and the role of Th 17 in cigarette smoke-induced lung inflammation and emphysema in mice.Methods Forty male BALB/c mice were randomly divided into 4 groups, including a control group C12, a control group C24, a smoke-exposure 12 week group (S12) and a smoke-exposure 24 week group S24 (n = 10 each).Morphological changes were evaluated by mean linear intercepts and destructive index (DI).The proportion of CD4+ IL-17 + Th17, CD4+ IFN-γ+ Th1, CD4+ IL-17 +IFN-γ+ T( Th17/ Th1 ), CD8+ IFN-γ+ Tc1, CD8+ IL-21R + and CD4+ IL-17 + IL-21 + T cells in lungs of mice was determined by flow cytometry.The mRNA expressions of RORγt and IL-17 were evaluated by real-time PCR.Results Mean linear intercepts and DI were significantly higher in S12 and S24 groups [(39 ± 4)μm, (47 ±7) μm], (39.1 ± 1.6, 45.2 ±3.1 ) as compared to C12[(32 ±4) μm,28.2 ± 1.6] and C24groups [(33 ± 3 ) μm ,28.9 ± 2.1], all P ＜ O.05.The percentage of Th17 of S12 and S24 groups [(3.3 ±1.1 )%, (7.2 ±2.2)%] was significantly increased as compared with that of C12 and C24 groups [( 1.8± 0.8) %, (2.0 ± 0.6) %], all P ＜ 0.05.The mRNA levels of RORγt [( 25 ± 4), ( 35 ± 3 )] and IL-17 [(26 ± 3), (36 ± 3 )] in S12 and S24 groups were higher than in C12 [(10 ± 5 ), (13 ± 5 )] and C24 groups [( 11 ± 7 ), (8 ± 6)], all P ＜ 0.05.The percentage of Th 1, Th17/Th1 and Tc1 cells of S12 and S24 groups [(10.0 ±3.7)%, (26.2 ±6.0)%], [(0.61 ±0.30)%, (1.82 ±0.52)%], [(17.0±4.5 ) %, ( 26.8 ± 8.5 ) %] was significantly increased as compared with that of C12 [( 3.8 ± 1.7 ) %,(0.27±0.17)%, (4.8 ±1.9)%] and C24 groups [(4.2±1.3)%, (0.28±0.11)%, (5.2±1.0)%], all P＜0.05.Moreover, the frequency of Th17 cells had a positive correlation with Th1, Tc1 cells and emphysematous lesions ( r =0.519 - 0.797, all P ＜ 0.01 ).In addition, a positive correlation between Th17/Th1 cells and emphysematous lesions was also found (r =0.742, 0.802, all P ＜0.01 ).The percentage of CD4+ IL-17+ IL-21 +T cells was significantly increased in S12 and S24 groups [(0.19 ±0.04) %, (0.55 ± 0.24) %] compared to controls [(0.07 ± 0.03 ) %, (0.08 ± 0.03 ) %], all P ＜ 0.05.Meanwhile, as compared with that of the controls [( 1.22 ± 0.31 ), ( 1.34 ± 0.18 )], the percentage of CD8+ IL-21 R + T cells was also increased in SI 2 and S24 groups [( 2.94 ± 1.26 ), (4.12 ± 2.26 )], but there were no differences among smoke-exposure groups ( P ＞0.05 ).The frequency of CD4+ IL-17 + IL-21 + T cells had a positive correlation with Th 1, Tc1 cells and emphysematous lesions (r = 0.694 -0.754, all P ＜0.05).And the frequency of CD8+ IL-21R+ T cells also had a positive correlation with emphysematous lesions ( r = 0.516, 0.725, all P ＜ 0.05).Conclusions Cigarette smoke increased the expression and the activity of Th17 in mice.Th17 may play a potential (active) role in the development of lung inflammation through IL-21/IL-21R pathway.     

慢性丙型肝炎患者CD4+CD25+调节性T细胞表达增加

目的:探讨CD4+CD25+调节性T(Treg)细胞在慢性丙型肝炎患者免疫下调中的意义.方法:流式细胞仪检测慢性丙型肝炎患者外周血中CD4+CD25+Treg细胞的数量;与CD4+CD25-T细胞共同培养,检测其抑制功能;流式细胞仪检测其对CD4+CD25-T细胞合成IFN-γ和IL-4的影响;RT-PCR检测CD4+CD25+Treg细胞中Foxp3的mRNA表达.结果:CD4+CD25+Treg细胞约占慢性丙型肝炎患者外周血中CD4+T细胞的14.1±1.6%,显著高于正常对照5.3±0.8%(P＜0.01),显著抑制CD4+T细胞的增殖(P=0.002),以及合成IFN-γ.CD4+CD25+Treg 细胞高表达Foxp3.结论:持续性HCV感染患者CD4+CD25+Treg细胞表达增加,特异性抑制Th1细胞反应.     

慢性乙型肝炎患者外周血及肝组织中CD4+CD25+调节性T细胞和乙型肝炎病毒特异性细胞毒性T淋巴细胞的表达及意义

目的 研究CD4+CD25+调节性T细胞和HBV特异性CTL在慢性乙型肝炎患者外周血和肝组织中的表达和临床意义.方法 流式细胞分析技术和流式细胞术细胞因子测定法(CFC)检测157例HBV感染者(包括急性乙型肝炎20例、慢性乙型肝炎115例、乙型肝炎肝硬化22例)和20例健康对照组外周血和部分肝组织中CD4+CD25+调节性T细胞和HBV特异性CTL的表达.组间分析采用t检验.结果急性乙型肝炎,慢性乙型肝炎轻、中、重度患者外周血中CD4+CD25+调节性T细胞分别为(2.87±0.94)%、(3.53±1.56)%、(4.59±2.98)%和(3.65±1.73)%,明显高于对照组的(2.36±0.60)%(t值分别为2.04、5.97、3.30和3.17,P<0.01);慢性乙型肝炎轻、中、重度和乙型肝炎肝硬化患者外周血HBV特异性CTL为(0.189土0.152)%、(0.103±0.110)%、(0.118±0.120)%和(0.098±0.101)%,明显低于急性乙型肝炎患者的(0.815±0.360)%(t值分别为10.09、11.87、9.17和8.96,P<0.01).肝组织中CD4+CD25+调节性T细胞和HBV特异性CTL的表达高于外周血.结论 CD4+CD25+调节性T细胞可能通过抑制CD8+T淋巴细胞在机体抗病毒过程中发挥重要作用.     

成纤维滑膜细胞p53基因表达对类风湿关节炎患者CD4+T淋巴细胞的调节

目的 研究人成纤维滑膜细胞(FLS)p53基因表达对类风湿关节炎(RA)患者CD4+T淋巴细胞的调节作用.方法 采用小分子干扰RNA(siRNA)转染抑制FKS内p53基因表达,并与RA患者外周血CD4+T淋巴细胞共同培养.检测转染后FLS中骨保护素(OPG)表达及白细胞介素(IL)-6分泌.并对与之共培养的CD4+细胞膜胞质内蛋白干扰素(IFN)-γ、IL-17、IL-4和CD25以及IFN-γ孤儿核受体γt(RORγt)、IL-17、Foxp3 RNA水平进行测定.结果 p53基因被抑制后,FLS分泌IL-6减少,但OPG表达未受影响.p53基因被抑制的FLS使共培养的CD4+T淋巴细胞内IL-17及IFN-γ蛋白和RNA表达上调,但对CD4+T淋巴细胞RORγt RNA影响不大.虽可上调Foxp3表达,但CD4+CD25high细胞阳性率并无明显变化.结论 FKS内D53表达对RA外周血Th1、Th17有调节作用.     

胰岛素抵抗的慢性丙型肝炎患者外周血CD4+CD25+调节性T细胞的数量及其功能

目的 了解胰岛素抵抗的慢性丙型肝炎患者外周血CD4 +CD25+调节性T细胞(Treg)数量和功能的变化.方法 筛选40例HLA-A2+慢性丙型肝炎患者(其中20例合并胰岛素抵抗),流式细胞仪检测患者CD4+CD25+Treg细胞占外周血中CD4+T细胞的频率,液闪计数仪检测对HCV特异性CD8+T细胞增殖的抑制作用,ELISA法检测IFN-y水平.统计学处理采用t检验.结果 胰岛素抵抗的慢性丙型肝炎患者外周血CD4 +CD25+ Treg细胞占CD4+T细胞的(9.5±1.9)％,明显低于慢性丙型肝炎患者的(11.2±2.2)％(t=2.615,P＜0.05).胰岛素抵抗指数(HOMA-IR)≥4患者的CD4+CD25+ Treg细胞比例为(9.0±1.8)％,明显低于HOMA-IR＜4患者的(10.8±2.3)％(t=2.413,P＜0.05).胰岛素抵抗的慢性丙型肝炎患者CD4+CD25+ Treg细胞和去除Treg的外周血单个核细胞(PBMC)共培养上清液中IFN-y为(4 050±580) pg/mL,明显高于慢性丙型肝炎患者的(2 005±330)pg/mL(t=13.705,P＜0.01).HOMA-IR≥4患者IFN-y为(5 682±986)pg/mL,明显高于HOMA-IR＜4患者的(2 819±660) pg/mL(t=7.630,P＜0.01).结论 随着胰岛素抵抗程度加重,慢性丙型肝炎患者外周血CD4+ CD25+ Treg细胞频率减低,对HCV特异性CD8+T细胞增殖的抑制作用减弱.     

从Th1/Th2、Treg/Th17之间的平衡研究轻、中度慢性乙型肝炎患者CD4~+T淋巴细胞的免疫失衡状态

目的从Th17及其相关细胞因子与Th1、Th2、Treg的相互关系,探讨轻、中度CHB患者CD4~+T淋巴细胞的整体免疫失衡状态。方法选择轻、中度CHB患者,与健康志愿者进行比较,观察其外周血各免疫细胞(Th17、Th1、Th2、Treg、Th1/Th2、Treg/Th17)、相关细胞因子(IL-17、IL-6、TGF-β、IFN-γ、IL-4)、主要效应分子(穿孔素、颗粒酶B)和核转录因子(孤独核受体RORγt、Foxp3等)的变化及其相互关系。结果与健康志愿者相比,CHB患者CD8~+T淋巴细胞比例更高,CD4~+/CD8~+比例显著下降,差异有统计学意义(P0.01);与健康志愿者相比,CHB患者Th1细胞比例更高,Th1/Th2显著升高,差异有统计学意义(P0.01);与健康志愿者相比,CHB患者Th17细胞比例更高,Treg/Th17比例显著下降,差异有统计学意义(P0.01);与健康志愿者相比,CHB患者穿孔素和颗粒酶B的表达更高,差异有统计学意义(P0.01);与健康志愿者相比,CHB患者FOXP3、IL17mRNA和RORγt的表达差异无统计学意义(P0.05);与健康志愿者相比,CHB患者TGF-B1、IL-6、IL-17显著增高,差异有统计学意义(P0.01);IFN-γ和IL-4的表达差异无统计学意义(P0.05)。结论轻、中度CHB患者在免疫细胞及其相关细胞因子、效应分子等各环节,尤其是Treg/Th17比例,均处于严重的免疫失衡状态。     

初发系统性红斑狼疮患者外周血CD4+调节性T细胞CD73表达

目的 研究CD73在初发活动性系统性红斑狼疮(SLE)患者外周血CD4+调节性T细胞的表达情况,探讨其在SLE发病中的作用.方法 采用流式细胞术检测29例初发未经治疗的活动期SLE患者(SLE组)和22例健康人(健康对照组)外周血CD4+CD25+CD73+T细胞百分率及CD4+CD73+、CD4+CDhi25、CD4+CD25+T细胞中叉头状转录因子3(FOXP3)蛋白表达,同时对CD73表达水平与SLE活动指标进行相关性分析.结果 SLE组患者外周血CD4+ CD25+ CD73+T细胞百分率低于健康对照组[(1.25±1. 32)%vs(2.35±1.09)%,P＜0.01].SLE组和健康正常对照组,CD73在C4+ CDhi25T细胞的表达水平[(29.05±12.53)%、(43.35±10.09)%]高于CD4+ CD25+T细胞[(17.48±6.92)%、(29.98±10.39)%,P＜0.001];FOXP3蛋白在CD4+ CD73+ T细胞[(65.36±14.40)%、(63.80±14.05)%]、CD4+ CDhi25 T细胞的表达水平[(67.30±13.04)%、(56.30±9.21)%]明显高于CD4+ CD25+ T细胞[(45.70±12.74)%、(43.98±5.17)%,P＜0.001],在CD4+ CD73-T细胞几乎不表达,而在CD4+ CD73+ T细胞、CD4+ CDhi25 T细胞中的表达差异无统计学意义(P值均大于0.05).CD73在CD4+ CD25+ T细胞的表达水平与SLE疾病活动指数、ESR、C反应蛋白、抗补体C1q、抗核小体抗体均无相关性(P＞0.05).结论 CD73可作为调节性T细胞新的表面标记,其在调节性T细胞中的异常表达可能参与SLE的发病机制.     

慢性乙型肝炎患者浆样树突状细胞体外诱导CD4+CD25+调节性T细胞的研究

目的 观察慢性乙型肝炎患者,乙型肝炎恢复者和健康人浆样树突状细胞(pDCs)体外诱导CD4+CD25+调节性T细胞(CD4+CD25+Treg)能力的差异,为阐明HBV感染慢性化的机制奠定基础.方法 采用免疫磁珠分离法体外分离46例慢性乙型肝炎患者,10例乙型肝炎恢复者和25名健康人外周血单个核细胞中pDCs,并将其分别与健康人CD4+CD45RA+初始T细胞共培养.采用HBcAg或破伤风毒素对去除CD25+细胞的外周血单个核细胞进行增殖刺激后,使用流式细胞仪及RT-PCR对pDCs-T共培养细胞中CD4+CD25+Treg的数量、表型及FOXP3基因表达情况进行测定;采用酶联免疫吸附法对共培养细胞上清液中的白细胞介素-10和转化生长因子β1进行了进一步检测.两组数据比较采用Mann Whitney U-test.结果 当细胞增殖刺激物为HBcAg时,细胞增殖幅度慢性乙型肝炎患者组为(7999.36±374.74)cpm,乙型肝炎恢复者组为(11 282.56±1174.46)cpm和健康人组为(12 304.58±1462.81)cpm,慢性乙型肝炎患者组细胞增殖幅度明显小于乙型肝炎恢复者组和健康人组,U=0～22.0,P值均<0.05·乙型肝炎恢复者组和健康人组间增殖幅度差异无统计学意义.当增殖刺激物为破伤风毒素时,细胞增殖幅度与阳性对照组之间,差异无统计学意义.CD4+CD25+Treg比例慢性乙型肝炎患者组为5.99%±1.85%,乙型肝炎恢复者组为3.04%±0.79%,健康人组为3.01%±1.53%,慢性乙型肝炎患者组中韵CD4+CD25+Treg比例明显高于乙型肝炎恢复者组和健康人组,U=6.0～71.5,P值均<0.05.3组人群pDCs-T共培养细胞的CD4+CD25+T细胞均检测到Fox p3 RNA,而在CD4+CD25 T细胞中,均未检测到Fox p3RNA.3组人群pDCs-T共培养细胞实验组上清液的白细胞介素-10和转化生长因子β1含量均明显高于阳性对照组.结论 pDCs以诱导CD4+CD25+Treg形式参与了乙型肝炎的慢性化.     

CD4~+CD25~+调节性T细胞在约氏疟原虫感染小鼠应答早期中的作用

目的探讨CD4+CD25+调节性T细胞在约氏疟原虫感染早期的作用及意义。方法用约氏疟原虫(致死型)感染DBA/2和BALB/c小鼠,计数红细胞感染率;在感染后第0d、3d、4d、5d和6d提取脾细胞应为,流式细胞术检测两种小鼠感染不同时间脾细胞悬液中CD4+T细胞和CD4+CD25+T细胞百分含量;ELISA法检测脾细胞培养上清IFNγ、IL10和TGFβ1水平。结果DBA/2小鼠的IFNγ水平在感染后第3d迅速升高后缓慢下降(P<0.01),CD4+CD25+T细胞数仅在感染后第5d出现有意义的升高(P<0.05),而IL10水平和CD4+T细胞数量都无明显改变。BALB/c小鼠的IFNγ水平在感染后第3d出现有意义的升高后迅速下降(P<0.01),CD4+CD25+T细胞数在感染后第3d开始明显升高,于感染后第5d出现下降(P<0.05),而IL10水平自感染后第3～6d持续维持高水平(P<0.05),CD4+T细胞数量于感染后第6天明显下降(P<0.05)。结论CD4+CD25+调节性T细胞在致死型约氏疟原虫感染BALB/c小鼠早期可能通过抑制性细胞因子IL10发挥免疫抑制作用。     

系统性红斑狼疮患者CD4~+CD25~+CD127~(low/-)调节性T细胞中Foxp3的表达及免疫抑制功能研究

目的 研究系统性红斑狼疮(SEE)外周血中调节性T细胞不同标志以及调节性T细胞在SLE发病中的作用;探讨CD127与Foxp3的相关性,明确CD127定义调节性T细胞的特异性;鉴定CD4~+CD25~+CD127~(low/-)T淋巴细胞免疫抑制功能.方法 ①采用四色直接荧光素标记法和多参数流式细胞术检测40例SLE患者(19例初发和21例缓解)及15名健康对照外周血CD4~+CD25~+T淋巴细胞、CD4~+CD25~+CD127~(low-)T淋巴细胞、CD4~+CD25~+Foxp3~+T淋巴细胞、CD4~+CD25~(high)T淋巴细胞、CD4~+CD25~(high)CD127~(low/-)T淋巴细胞、CD4~+CD25~(high)Foxp3~+T淋巴细胞以及CD4~+CD127~(low/-)Foxp3~+T淋巴细胞占CD4~+T淋巴细胞的比率,并且将7种调节性T细胞比率与外周血抗双链DNA(dsDNA)等抗体及SLE疾病活动指数(SLEDA1)评分等进行相关性分析.②以流式细胞分选术结合细胞培养技术,检测和分析3例SLE患者和4名健康人外周血中CD4~+CD25~+CD127~(low/-)调节性T细胞对CD4~+CD25~-效应性T细胞增殖的抑制作用.采用两样本均数的t检验,重复测量的方差分析,Pearson相关与Spearman相关分析进行统计学处理.结果 ①SLE患者组7种调节性T细胞比率分别为(6.1±1.7)%,(3.1±1.3)%,(2.1±1.0)%,(1.6±0.3)%,(0.97±0.28)%,(0.69±0.23)%和(0.71±0.35)%.与健康对照组比较:SLE患者组前6种调节性T细胞比率均低于健康对照组(P<0.05).②SLE患者组:CD4~+CD25~+Foxp3~+、CD4~+CD25~(high)Foxp3~+T淋巴细胞比率与IgA呈正相关;CD4~+CD25~(high)CD127~(low/-)T淋巴细胞比率与抗SSB抗体呈正相关.③SLE患者初发组和缓解组比较:SLE患者初发组7种调节性T细胞中除CD4~+CD127~(low/-)Foxp3~+T淋巴细胞比率外,其余均低于缓解组(P<0.05).④SLE患者初发组治疗前后比较:激素治疗前6种调节性T细胞比率均低于激素治疗后(P<0.05).⑤SLE患者初发组、缓解组和对照组中,CD4~+CD25~+T淋巴细胞及CD4~+CD25~(high)T淋巴细胞中Foxp3的表达与CD127低表达均呈正相关.⑥SLE患者、健康人CD4+CD25-效应性T细胞的体外增殖都可以被自身CD4~+CD25~+CD127~(low/-)调节性T细胞所抑制,但SLE患者的抑制率明显低于健康对照.结论 SLE的免疫异常可能与调节性T细胞的数量和功能缺陷有关;CD127可能代替Foxp3作为调节性T细胞特异性的表面标记物.     

老年肿瘤患者外周血CD4+CD25+调节性T细胞的检测及临床意义

目的 探讨老年肿瘤患者CD4+CD25+凋节性T细胞的变化及其与免疫衰老的关系.方法 以64例健康青年人(青年组)、52例健康老年人(老年组)和64例老年肿瘤患者(老年肿瘤组)为研究对象,采用多色荧光素标记和多参数流式细胞术,分别检测外周血中CD4+CD25high、CD4+CD25+FoxP3+和CD4+CD25+CD127low T细胞,分析和比较各组之间的差异及各指标之间的相关性.结果 以外周血中CD4+ T细胞设门,青年组、老年组和老年肿瘤组CD4+CD25high T细胞分别为(1.390±0.4]2)%、(1.729士0.247)%和(2.150±0.769)%,CD4+CD25+FoxP3+细胞分别为(1.180±0.343)%、(2.477士0.400)%和(4.980±2.177)%,CD4+CD25+CD127low T细胞分别为(5.213±0.942)%、(6.186±1.196)%和(7.194±1.538)%.3项指标均为老年肿瘤组最高,青年组最低,差异有统计学意义(P＜0.05);3项指标均呈正相关(P＜O.05).结论 CD4+CD25+调节性T细胞过量累积可能与免疫衰老及老年肿瘤密切相关.