CD4+CD25+Foxp3+调节性T细胞在慢性乙型肝炎患者中的作用

目的 探讨CD4+CD25+Foxp3+调节性T细胞与乙型肝炎慢性化和病毒清除之间的关系.方法 收集慢性活动性乙型肝炎(CAH)患者19例、HBV携带者(AsC)21例、HBV感染恢复者12例和健康对照者15例.通过流式细胞术分析外周血CD4+CD25+Foxp3+T细胞的表型和频率,磁珠分选(MACS)CD4+CD25+T细胞,实时荧光定量PCR方法 分析Foxp3 mRNA基因在CD4+CD25+T细胞的表达水平.统计学处理采用单因素方差分析或非参数检验.结果CAH或AsC组外周血CD4+CD25+Foxp3+T细胞频率以及CD4+CD25+T细胞中Foxp3 mRNA的表达水平显著高于健康对照组或HBV感染恢复者(F=6.8,F=3.72,均P<0.05).免疫组织化学染色发现,CAH患者肝组织Foxp3'T细胞浸润累积较对照组明显增高,但AsC较CAH减少.HBeAg阳性患者(包括CAH和AsC)CD4'CD25'T细胞频率显著高于HBeAg阴性患者(t=2.3,P<0.05),抗-HBe阴性患者显著高于抗-HBe阳性患者(t=2.4,P<0.05).CD4+CD25+Foxp3+T细胞频率与慢性乙型肝炎患者血清中HBV病毒载量存在正相关(r=0.56,P<0.01).结论 慢性乙型肝炎患者CD4+CD25+Foxp3+调节性T细胞异常与乙型肝炎慢性化和病毒清除有关.     

烟草烟雾暴露大鼠中CD4白细胞介素-17+T细胞与CD+4Foxp3+调节性T细胞的变化及意义

目的 观察烟草烟雾暴露大鼠外周血与BALF中CD+4白细胞介素(IL)-17+T细胞(Th17细胞)与CD; Foxp3+调节性T细胞(Treg细胞)及相关因子的水平变化,探讨Th17和Treg细胞在烟草诱导气道炎症和COPD的发生与发展中的作用.方法 将40只健康清洁级雄性Wistar大鼠分为暴露12周组和24周组、对照12周组和24周组,每组10只.用烟熏法复制大鼠气道炎症的动物模型.收集BALF进行细胞学计数和分类,采用酶联免疫吸附法检测大鼠血清和BALF上清液中IL-17和IL-6水平,用流式细胞术检测Th17和Treg细胞比例,用实时荧光定量PCR法检测IL-17和Foxp3 mRNA的表达.多组间比较采用单因素方差分析,组内两两比较采用SNK法和GamesHowell法.结果 暴露12周组和24周组大鼠外周血IL-17浓度分别为(52.6±1.8) ng/L和(75.4±6.0) ng/L,BALF中IL-17浓度分别为(78.1 ±5.8) ng/L和(95.0±6.8)ng/L,均显著高于对照12周组[(40.0±3.2) ng/L和(54.5±4.6) ng/L]及24周组[(36.7±3.2) ng/L和(53.9±3.7) ng/L],暴露24周组与其他3组比较,差异均有统计学意义(均P＜0.05).暴露24周组大鼠外周血中IL-6浓度为(31.4±2.1)ng/L,显著高于对照24周组[(11.5±0.5)ng/L];暴露12周组和24周组大鼠BALF中IL-6浓度分别为(33.3 ±2.3)ng/L和(44.6±3.0)ng/L,显著高于对照12周组和24周组[(15.6±1.8)ng/L和(18.0±1.9) ng/L].暴露12周组和24周组大鼠外周血中Th17细胞比例分别为(1.81±0.19)％和(3.74±0.55)％,BALF中Th17细胞比例分别为(7.84±0.28)％和(8.01±0.39)％,均显著高于对照12周组[(0.97±0.08)％和(5.64±0.54)％]及24周组[(1.08±0.10)％和(5.95±0.48)％],暴露24周组与其他3组比较,差异均有统计学意义(均P＜0.05).暴露12周组和24周组大鼠BALF中Treg细胞比例分别为(8.81±0.49)％和(11.98±0.72)％,均显著高于对照12周组和24周组[(4.34±0.28)％和(5.21±0.42)％].暴露12周组和24周组大鼠外周血中IL-17 mRNA表达量分别为25.7±2.0和33.9±1.5,BALF中IL-17 mRNA表达量分别为22.2±1.8和34.7±4.2,均显著高于对照12周组(11.3±2.6和11.6 ±2.4)及24周组(11.1±2.0和13.5±3.4);暴露12周组和24周组大鼠BALF中Foxp3 mRNA表达量分别为24.4±2.7和30.3±2.7,显著高于对照12周组和24周组(12.7±2.7和14.6±3.8).暴露组大鼠BALF中Th17细胞与其BALF中细胞总数和巨噬细胞数呈正相关(r值分别为0.512和0.543,均P＜0.05).结论 烟草暴露可导致大鼠气道炎症模型的Th17细胞和Treg细胞及相关炎症因子水平升高,提示Treg细胞可能参与气道炎症的免疫调节,Th17细胞异常升高可能与大鼠气道炎症反应的发生及持续进展有关.     

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+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.     

香烟烟雾暴露对支气管哮喘大鼠CD4+ CD25+调节性T细胞及转录因子Foxp3表达的影响

目的 探讨香烟烟雾暴露对支气管哮喘(简称哮喘)大鼠CD4+CD25+调节性T细胞(Treg)数量及转录因子Foxp3表达的影响.方法 将40只雄性Wistar大鼠按随机数字表法分为生理盐水组、烟雾暴露组、哮喘组和哮喘+烟雾暴露组,每组10只;哮喘组采用卵清白蛋白(OVA)致敏并吸入激发制备哮喘模型,生理盐水组雾化生理盐水,烟雾暴露组采用吸入香烟烟雾,哮喘+烟雾暴露组于每日雾化激发OVA前给予香烟烟雾吸入.流式细胞仪检测外周血CD4+ CD25+Treg细胞占CD4+T细胞的比例,酶联免疫吸附试验(ELISA)检测外周血和肺组织γ干扰素(INF-γ)以及白细胞介素4(IL-4)含量;Western blot检测肺组织Foxp3蛋白表达水平.结果 (1)哮喘组大鼠CD4+CD25+Treg为(6.4±1.0)%,低于生理盐水组的(9.9±1.0)%,差异有统计学意义(F=92.59,P＜0.01);哮喘+烟雾暴露组为(3.3±0.8)%,低于生理盐水组和哮喘组,差异有统计学意义(F=92.59,P＜0.01).(2)哮喘组大鼠血浆和肺组织中IL-4含量[(22.6±4.3)ng/L、(0.8±0.1)ng/L]高于生理盐水组[(11.4±2.9)ng/L、(0.3±0.1)ng/L],差异有统计学意义(F值分别31.69和49.29,P＜0.01);哮喘+烟雾暴露组血浆和肺组织中IL-4含量[(34.1±6.1)ng/L、(1.4±0.3)ng/L]高于生理盐水组和哮喘组,差异有统计学意义(F值分别为31.69和49.29,P＜0.05);哮喘组血浆中INF-γ含量[(59±20)ng/L]低于生理盐水组[(151±56)ng/L],差异有统计学意义(F=21.83,P＜0.05),哮喘+烟雾暴露组INF-γ含量[(10±3)ng/L]低于生理盐水组和哮喘组,差异有统计学意义(F=21.83,P＜0.05).(3)哮喘组Foxp3蛋白表达为8.18±0.26,低于生理盐水组的10.27±0.33(F=43.33,P＜0.01);哮喘+烟雾暴露组为6.36±0.38,低于生理盐水组和哮喘组(F=43.33,P＜0.05).结论 香烟烟雾暴露可能通过下调CD4+CD25+Treg数量并抑制Foxp3蛋白表达,进一步加重哮喘的Th1/Th2失衡.     

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.     

CD4+调节性T细胞在再生障碍性贫血免疫发病中的作用

目的探讨CD4 调节性T细胞(Tregul atory,Treg)在再生障碍性贫血(aplasticanemia,AA)免疫发病机制中的作用。方法对2005年7月至2006年3月苏州大学附属第一医院23例发病期AA患者、10例恢复期AA患者及15名正常对照者测定骨髓中CD4 CD25 Treg、CD4 CTLA-4 Treg、CD4 PD-1 Treg、CD3 CD8-IL-10 Treg、CD3 CD8-TGF-β1 Treg、CD3 CD8-IL-4 Treg变化,分析其与免疫启动因素CD28及免疫效应因素干扰素-γ(IFN-γ)的关系。结果AA发病期、恢复期及正常对照组CD4 CD25 Treg数比较差异无显著性意义;AA发病期CD4 CTLA-4 Treg表达较对照组明显下降,PD-1与对照组比较差异无显著性意义;AA恢复期CD4 CT-LA-4 Treg及PD-1表达均较发病期明显升高,与对照组相当;AA恢复期患者IFN-γ较发病期明显下降(P=0.021),与正常对照组相当(P=0.402),IL-4、TGF-β及IL-10与AA发病组及对照组比较差异均无显著性意义;AA发病期患者骨髓CD3 CD4 T淋巴细胞膜表面CD28表达较正常对照组明显增加;AA恢复期患者的CD28表达率较发病期显著降低,亦低于正常对照组(P=0.048)。AA发病期CD4 CTLA-4 Treg明显下降,其余Treg无显著变化;AA恢复期CD4 CTLA-4 Treg、CD4 PD-1 Treg升高显著。CD28/CTLA-4、CD28/PD-1发病期与对照组比,均显著升高;AA恢复期为明显低于发病期,与对照组相当。IFN-γ /IL-4 、IFN-γ /TGF-β 及IFN-γ /IL-10 发病期较对照组均显著升高;AA恢复期明显低于发病期,而与对照组相当。结论在免疫应答起始阶段或效应阶段,AA正性调控共刺激因子表达增加,而负性调控共刺激因子表达减少或无变化,使免疫平衡向持续增强偏移,调节性因素增高利于造血恢复;对于增强的免疫应答,AA的CD4 Treg呈下降趋势,可能与发病有关。     

尖锐湿疣患者外周血Foxp3+CD4+CD25+调节性T细胞的检测及意义

目的 了解尖锐湿疣患者外周血Foxp3+CD4+CD25+调节性T细胞的表达水平,探讨其在尖锐湿疣发生发展机制中的作用.方法 分别收集30例尖锐湿疣患者(复发15例,初发15例)及20例健康者外周抗凝静脉血,分离出外周血单个核细胞.藻红蛋白(PE)标记抗CD4单抗,异硫氰酸荧光素(FITC)标记抗CD25单抗,细胞破膜后PE标记的抗Foxp3单抗行细胞内染色,三色流式细胞术分析Foxp3+CD4+CD25+调节性T细胞比例.组间比较采用ANOVA检验.结果外周血中Foxp3+CD4+CD25+调节性T细胞水平在尖锐湿疣患者组为(3.4±1.0)%,在复发组为(4.7±1.2)%,均显著高于健康对照组的(1.2±0.5)%(P<0.01).外周血Foxp3+CD4+CD25+调节性T细胞水平在初发组为(2.1±1.0)%,高于健康对照组,但差异无统计学意义,而在复发组明显高于初发组(P<0.05).结论 尖锐湿疣患者外周血Foxp3+CD4<"+>CD25+调节性T细胞数量增加,这种细胞免疫功能失调可能与其免疫学发病机制有关.     

老年脓毒症休克患者CD4+CD25+调节性T细胞的变化及对预后的影响

目的 探讨老年脓毒症休克患者CD4+CD25+调节性T淋巴细胞(CD4+CD25+Treg)的变化及对预后的影响.方法 选择老年脓毒症休克患者75例,采用流式细胞仪检测患者外周血第1、4天和第7～10天CD4+CD25+叉头转录基因P3(FoxP3)/CD4+比例和白细胞DR抗原(HLA-DR)表达.结果 老年脓毒症休克患者平均年龄(69.2±7.5)岁,28 d病死率为53.3%.(1)休克死亡组与生存组CD4+CD25+FoxP3/CD4+比较,第1天(1.76±0.31)对(1.68±0.24)%,第4天(1.94±0.32)%对(1.82±0.28)%,差异均无统计学意义(P＞0.05),第7～10天休克死亡组(2.65±0.28)%,明显高于存活组(1.79±0.27)%,差异有统计学意义(t=11.30,P＜0.01);(2)死亡组第4天和第7～10天HLA-DR表达持续低下,显著低于生存组(t=7.29,t=16.80,均P＜0.01),并分别与CD4+CD25+FoxP3/CD4+比例呈显著负相关(r=-0.39,P＜0.05;r=-0.58,P＜0.01);(3)多元Logistic回归分析显示,脓毒症休克患者第7～10天CD4+CD25+FoxP3/CD4+(OR=3.47,95%CI:1.33～10.0)和HLA-DR(OR=0.27,95%CI:0.14～0.73)是影响其死亡的独立危险因素.结论 老年脓毒症休克患者CD4+CD25+Treg持续上升,提示机体免疫功能抑制,脓毒症休克死亡的危险性增加.     

吸烟所致肺气肿模型大鼠戒烟后肺病理及炎性介质的变化

目的 探讨吸烟所致肺气肿模型大鼠在戒烟后肺组织病理及炎性介质表达变化规律.方法 选用Wistar雄性大鼠80只,随机分为非吸烟正常对照组及吸烟所致肺气肿模型戒烟0 d、1 w、2 w、4 w、6 w、8 w、12 w组.采用酶联免疫吸附方法测定各组大鼠血清中IL-8的蛋白质含量,S-P免疫组化学方法检测肺组织NF-кB p65的表达,并光镜观察HE染色切片、对大鼠气道炎症进行病理学评分.结果 肺气肿大鼠模型成功复制:肺组织HE染色切片,光镜下观察,其病理变化与人类肺气肿相似;肺气肿各时相戒烟组大鼠血清IL-8浓度、肺组织NF-кB的表达及病理评分较未吸烟正常对照组明显升高(P<0.05);肺气肿各相邻时相戒烟组间比较,各检测指标有上升趋势,戒烟12 w组大鼠血清中IL-8的蛋白质含量、肺组织NF-кB p65 的表达、气道炎症的病理学评分均较戒烟0天组明显升高(P<0.05).结论 吸烟所致肺气肿模型大鼠形成后,其气道炎症在戒烟后12周内仍可见持续加重.     

结核性胸膜炎患者外周血CD4CD25调节性T细胞水平及Foxp3mRNA表达的分析

目的观察结核性胸膜炎患者外周血单个核细胞（PBMCs）中CD4 CD25调节性T细胞(CD4 CD25 Treg)水平及Foxp3 mRNA表达的变化,探讨CD4 CD25 Treg在结核性胸膜炎发病中的作用。方法采用流式细胞仪检测58例结核性胸膜炎患者和51例健康志愿者（正常对照组）PBMCs中CD4 CD25 Treg的比例;RT-PCR检测PBMCs中Foxp3 mRNA的表达。结果结核性胸膜炎患者PBMCs中CD4 CD25 Treg的比例明显高于正常对照组(P<0.05);Foxp3 mRNA的表达明显高于正常对照组(P<0.05)。 结论结核性胸膜炎患者外周血中具有免疫抑制活性CD4 CD25 Treg的数量增加,功能增强,可能是结核性胸膜炎发生发展的一个因素。     

慢性乙型肝炎患者血清转化生长因子β1与CD4~+CD25~+Foxp3~+调节性T淋巴细胞的关系

目的 调查慢性乙型肝炎患者转化生长因子β1(TGF β1)与CD4~+CD25~+Foxp3~+调节性T淋巴细胞异常的关系.方法 将实验对象分为慢性乙型肝炎(CHB)患者、无症状HBV携带者(AsC)、乙型肝炎恢复者、正常人对照4组.通过流式细胞术分析外周CD4~+CD25~+Foxp3~+调节性T淋巴细胞的表型和频率以及实时荧光定量PCR分析Foxp3表达水平;并通过酶联免疫吸附法检测血清中TGF β1水平.根据数据不同采用方差分析或秩和检验进行统计学分析.结果 CHB或AsC组外周CD4~+T淋巴细胞中CD4~+CD25~+Foxp3~+T淋巴细胞频率以及CD4~+CD25~+T淋巴细胞中Foxp3 mRNA表达水平显著高于正常人对照组,差异有统计学意义(P<0.05).CHB患者和AsC血清中TGF β1水平显著高于正常人和乙型肝炎恢复者,并与CD4~+CD25~+Foxp3~+T淋巴细胞频率存在显著正相关(r=0.78,P<0.01).结论 CHB和AsC患者TGF β1与CD4~+CD25~+Foxp3~+调节性T淋巴细胞增高有密切关系.     

Generation of regulatory dendritic cells and CD4+Foxp3+ T cells by probiotics administration suppresses immune disorders

The beneficial effects of probiotics have been described in many diseases, but the mechanism by which they modulate the immune system is poorly understood. In this study, we identified a mixture of probiotics that up-regulates CD4⁺Foxp3⁺ regulatory T cells (Tregs). Administration of the probiotics mixture induced both T-cell and B-cell hyporesponsiveness and down-regulated T helper (Th) 1, Th2, and Th17 cytokines without apoptosis induction. It also induced generation of CD4⁺Foxp3⁺ Tregs from the CD4⁺CD25⁻ population and increased the suppressor activity of naturally occurring CD4⁺CD25⁺ Tregs. Conversion of T cells into Foxp3⁺ Tregs is directly mediated by regulatory dendritic cells (rDCs) that express high levels of IL-10, TGF-β, COX-2, and indoleamine 2,3-dioxygenase. Administration of probiotics had therapeutical effects in experimental inflammatory bowel disease, atopic dermatitis, and rheumatoid arthritis. The therapeutical effect of the probiotics is associated with enrichment of CD4⁺Foxp3⁺ Tregs in the inflamed regions. Collectively, the administration of probiotics that enhance the generation of rDCs and Tregs represents an applicable treatment of inflammatory immune disorders.