白介素23受体在支气管哮喘小鼠脾源性CD4+T细胞中的表达及意义

目的 探讨急性支气管哮喘(简称哮喘)小鼠CD4+T细胞表面白介素23受体(IL-23R)的表达及在哮喘发病中的作用.方法 建立急性哮喘小鼠模型,免疫磁珠分离小鼠脾源性CD4+T细胞,培养24 h后,检测CD4+T细胞表面IL-23R的表达、Th17细胞的阳性率及细胞培养上清液中的IL-17水平.结果 哮喘小鼠脾脏CD4+T细胞表面IL-23R的表达明显高于正常组(P＜0.01);哮喘小鼠脾脏CD4+T细胞中Th17细胞的阳性率明显高于正常组(P＜0.01);哮喘小鼠脾脏CD4+T细胞分泌IL-17浓度明显高于正常组(P＜0.01);小鼠脾脏CD4+T细胞表面IL-23R的表达与Th17细胞的阳性率和IL-17的浓度呈正相关.结论 IL-23R在急性哮喘的发病机制中可能起重要作用.     

RNA干扰抑制IL-23表达对感染后内脏高敏感小鼠肠黏膜固有层DC活化Th17细胞功能的影响

背景：前期研究发现感染后内脏高敏感小鼠肠黏膜固有层树突细胞（DC）诱导活化Th17细胞与肠道感染消退后肠黏膜免疫系统的持续激活有关。推测DC可能系通过分泌白细胞介素-23（IL-23）活化Th17细胞。目的：应用RNA干扰技术抑制DC分泌IL-23,探讨感染后内脏高敏感小鼠肠黏膜固有层DC活化Th17细胞的机制。方法：建立旋毛虫感染后内脏高敏感小鼠模型,以免疫磁珠分选肠黏膜固有层DC和脾脏CD4＋T细胞。构建、鉴定小鼠IL-23小发夹RNA（shRNA）干扰质粒,以脂质体法转染DC（A组）以抑制IL-23表达,同时设置转染空脂质体的DC（B组）和转染无关序列shRNA干扰质粒的DC（C组）作为对照。各组DC与CD4＋T细胞共培养120 h,以单独培养的CD4＋T细胞（D组）作为对照。以ELISA方法检测DC转染前后培养上清液中的IL-23水平,以及DC与CD4＋T细胞共培养上清液和CD4＋T细胞单独培养上清液中的IL-17水平。结果：A组DC培养上清液中的IL-23水平较转染前显著降低（P〈0.05）,B、C两组转染前后IL-23水平无明显变化。A、B、C组DC与CD4＋T细胞共培养上清液中的IL-17水平均较D组显著增高（P〈0.05）,其中A组显著低于B、C两组（P〈0.05）,B、C组间差异无统计学意义。结论：感染后内脏高敏感小鼠肠黏膜固有层DC可能通过分泌IL-23活化Th17细胞,参与维持肠道感染消退后肠黏膜免疫系统的持续激活。     

香烟烟雾提取物对CD4^＋T细胞向Th17细胞和调节性T细胞分化的影响

目的观察香烟烟雾提取物（CSE）对CD4^＋T细胞向Th17细胞和调节性T细胞分化的影响,为探索香烟烟雾暴露导致气道慢性炎症的机制提供实验依据。方法采用免疫磁珠法分离纯化健康志愿者外周血CD4^＋T细胞,以1×10^6／ml细胞密度接种于96孔培养板,分为以下8个组①空白对照组;②T细胞刺激剂组：加入T细胞刺激剂抗人CD3／28抗体微磁珠;③T细胞刺激剂CSE干预组：CD3／28＋2%CSE;④细胞因子组：CD3／28＋细胞因子;⑤细胞因子CSE干预组：CD3／28＋细胞因子＋2％CSE;⑥芳香烃受体（AHR）激动剂6-甲酰基吲哚[3,2-b]咔唑（FICZ）组CD3／28＋细胞因子＋FICZ;⑦AHR拮抗剂白藜芦醇组：CD3／28＋细胞因子＋2％CSE＋白藜芦醇;⑧溶剂对照组：CD3／28＋细胞因子＋DMSO。细胞因子为含TGF-β/IL-1β／IL-6／IL～23的混合细胞因子,以诱导Th17细胞和调节性T细胞分化。培养5d后,收集细胞,采用流式细胞术检测细胞表面分子CD4^＋CD25^＋Foxp3^＋细胞（Treg细胞）,以及胞内细胞因子IL-17＋的CD4^＋T细胞（Th17细胞）,计算各种刺激培养条件下,诱导生成的Th17及Treg细胞占CD4^＋T细胞的百分比。结果①CSE对Th17细胞分化的影响：空白对照组Th17细胞比例为（0．69±0．12）％,加入T细胞刺激剂后为（1．32±0．12）％,在此基础上加入CSE的干预组IL-17＋细胞比例升高为（2．17±0．24）％,（t=3．21,P〈0．01）;细胞因子组IL-17＋细胞比例为（1．35±0．08）％,而在此基础上加入CSE的干预组Th17细胞升高为（2．58±0．39）%（t=3．13,P〈0．01）。②CSE对Treg细胞分化的影响：在空白对照组中,Treg细胞占CD4^＋T细胞中的比例为（0．21±0．19）％,在加入T细胞刺激剂后,Treg细胞比例升高（3．59±0．37）％,加入细胞因子后,Treg细胞比例明显增加（5．85±0．76）％;在继续加入CSE干预后,Treg细胞比例明显减少（3．07±0．33）％（t=3．74,P〈0．01）;同样,T细胞刺激剂CSE干预组也出现Treg细胞比例减少（2．19±0．19）％,（t=2．71,P〈0．05）。③AHR活化对Treg细胞和Th17细胞分化的影响：AHR激动剂FICZ组的Treg细胞比例明显低于细胞因子组[（2．60±0．40）％,（5．85±0．76）％]（t=4．18,P〈0．01）,但Th17细胞比例升高[（2．86±0．43）％,（1．35±0．08）％]（t=3．65,P〈0．01）。AHR阻断剂白藜芦醇组中的Treg细胞比例和Th17细胞比例均低于细胞因子组,分别为[（0．33±0．14）％,（5．85±0．76）％],（t=7．71,P〈0．01）和[（0．42±0．07）％,（1．35±0．08）％],（t=8．87,P〈0．001）,并且和空白对照组接近,在细胞培养第5天通过7-AAD-AnnexinV对该组细胞检测并未发现细胞异常凋亡或死亡情况,结合该组细胞培养过程中的镜下形态推测该实验组CD4^＋T细胞的分化增殖受到白藜芦醇抑制。结论CSE可促进CD4^＋T细胞向Th17细胞分化,并抑制Treg细胞分化,这一过程可能通过AHR诱导。     

CTLA4-Ⅰg对老年支气管哮喘病人CD4^＋CD45RO^＋T细胞功能的影响

目的 研究老年支气管哮喘病人周围血CD4^＋CD45RO^＋T细胞表达IL4及IL-13的情况及CTLA4-Ⅰg对其影响。方法 用ELISA方法测定老年支气管哮喘病人CD4^＋CD45RO^＋T细胞产生IL-4和IL-13的水平及CTLA4-Ⅰg对其影响。结果 老年支气管哮喘病人CD4^＋CD45RO^＋T细胞分泌IL4、IL-13增多，IL-13增多较IL-4更为明显（P〈0．01），CTLA4-Ⅰg可有效抑制老年哮喘病人CD4^＋CD45RO^＋T细胞分泌IL-4和IL-13（P〈0．01）。结论 CD4^＋CD45RO^＋T细胞产生的IL-4和IL-13在老年哮喘发病中起重要作用，CTLA4-Ⅰg可有效抑制IL-4和IL-13的分泌。     

支气管哮喘大鼠CD4^＋CD25^＋T细胞的变化及地塞米松干预作用的研究

目的研究支气管哮喘（简称哮喘）大鼠模型支气管肺泡灌洗液（BALF）、血液、脾脏CD4^＋CD25^＋T细胞的变化,及地塞米松对CD4^＋CD25^＋T细胞的影响。方法50只SD大鼠随机分为5组,空白对照（A）组,哮喘（B）组,地塞米松1（C）组、地塞米松2（D）组,地塞米松3（E）组。A组第1天给予腹腔注射生理盐水1ml,第15～21天每天给予生理盐水雾化。B、C、D、E组用卵蛋白建立哮喘大鼠模型,第1天,每只大鼠腹腔注射抗原1ml（卵蛋白1mg＋灭活百日咳杆菌9×10。个＋氢氧化铝干粉100mg）混悬液,第15～21天给予1％的卵蛋白雾化30min,C、D、E组于雾化后分别给予腹腔注射地塞米松0．2mg／kg、1mg／kg、2mg／kg。采用流式细胞仪检测的方法,观察大鼠体内BALF、外周血、脾脏CD4^＋CD25^＋T细胞的变化及使用不同剂量地塞米松后对其的影响。结果B组BALF、外周血、脾脏CD4^＋CD25^＋T细胞表达占CD4^＋T细胞的百分比分别是（42．21±5．62）％、（12．69±2．70）％、（11．15±1．05）％,A组结果分别是（18．76±5．85）％、（6．21±1．73）％、（7．85±2．13）％。B组与A组比较,差异均具有统计学意义（P〈0．01,P〈0．01,P〈0．05）;C组、D组、E组BALF中CD4^＋CD25^＋T细胞占CD4^＋T细胞的百分比表达分别是（10．49±4．03）oA、（13．28±5．12）％、（7．51±5．39）％,显著低于A组和B组,（P〈0．05,P〈0．01）;外周血中,C组（6．03±1．43）％、D组（4．88±0．95）％与A组（6．21±1．73）％比较,差异无统计学意义,E组（3．49士0．62）％与C组、A组比较,差异有统计学意义（P〈0．05）。脾脏中,c组（7．25±1．82）%、D组（8．63±3．18）％与A组（7．85±2．13）％比较,差异无统计学意义,E组（3．38±1．37）％与C组、D组、A组比较,差异有统计学意义（P〈0．05）。结论CD4^＋CD25^＋T细胞在哮喘大鼠体内有明显的优势表达,可能是哮喘发病的机制之一。地塞米松可以抑制CD4^＋CD25^＋T细胞的表达。BALF内CD4^＋CD25^＋T细胞的变化与外周血和脾脏的变化具有一致性,监测外周血或脾脏CD4^＋CD25^＋T细胞变化可了解肺部情况。     

哮喘儿童白细胞CD21、CD23、CD40L的表达与血清IgE相关性研究

检测儿童哮喘发作期及缓解期外周血细胞表面分化抗原CD21^＋、CD23^＋、CD40^＋CD21^＋CD23^＋的百分率及血清IgE水平。结果哮喘发作组CD21^＋、CD25^＋、CD40^＋L及CD21^＋CD23^＋的百分率及血清IgE水平均高于哮喘缓解组和正常对照组（P均〈0．05），哮喘缓解组CD23^＋的百分率明显高于正常对照组（P〈0．05）；哮喘发作组CD21^＋、CD23^＋、CD40^＋L及CD21^＋CD23^＋的百分率与血清IgE呈正相关。表明CD21、CD23及CD40L的表达与血清IgE密切相关，其在哮喘的发病机制中发挥重要作用。     

强直性脊柱炎患者外周血T细胞亚群的变化及意义

目的探讨强直性脊柱炎（AS）患者外周血中T细胞亚群的变化及其意义。方法采用流式细胞仪（FCM）检测外周血淋巴细胞表面CD3、CD4、CD8及其胞质内细胞因子IFN-γ和IL-4的表达。结果与正常对照组相比,As患者外周血Th细胞（CD;CD4＋）百分率无显著差异,Tc细胞（CD;CD;）明显升高（P〈0．05）;Th1细胞（CD3^＋CD4^＋IFN-γ^＋）百分率明显升高,Th2细胞（CD3^＋CD4^＋IL4^＋）无显著性差异;Te1细胞（CD3^＋CD8^＋IFN-γ^＋）百分率明显降低,T02细胞（CD3^＋CD8^＋IL4^＋）无显著性差异。结论AS患者外周血T细胞Th1／Th2、Tcl／Tc2亚群比例失衡,呈Th1、Tc2优势型。     

左旋咪唑对细粒棘球蚴感染小鼠不同时期T细胞亚群的影响

目的探讨左旋咪唑（LMS）对细粒棘球蚴感染鼠的免疫调节作用和对病程转归的影响。方法昆明种小鼠腹腔接种细粒棘球蚴，建立感染动物模型。在感染后2、4、8、12、16、20周，未治疗组和实验组分别给予生理盐水和左旋咪唑（25mg／kg），连续7d，测定各组小鼠脾指数、胸腺指数及囊重，运用流式细胞术（FCM）测定小鼠脾CD4^＋和CD8^＋T细胞百分率及CD4^＋／CD8^＋比值的动态变化。另设8只未接种小鼠为健康对照。结果生理盐水组小鼠感染2周时CD4^＋、CD8^＋T细胞百分率显著高于健康对照组（P〈0．01）），随后CD4^＋T细胞的百分率逐渐降低，CD8^＋T细胞的百分率逐渐增高，至感染后16周和20周，CD4^＋T细胞、CD8^＋T细胞的百分率及CD4^＋／CD8^＋比值与健康对照组比较差异仍具有显著性（P〈0．01）。与生理盐水组小鼠相比，左旋咪唑组小鼠在感染2周时CD4^＋、CD8^＋T细胞的百分率明显增高，与健康组小鼠相比有统计学意义（P〈0．01）；在感染16周和20周时脾指数升高，CD4^＋T细胞百分率上升，CD8^＋T细胞的百分率下降，CD4^＋／CD8^＋比值升高，平均囊重下降，与生理盐水组比较差异均有显著性（P〈0．01）。结论左旋咪唑对细粒棘球蚴感染小鼠有免疫调节作用，在感染后期可升高小鼠脾指数，使CD4^＋T细胞及CD8^＋T细胞比例恢复正常，机体的细胞免疫功能增强，从而减缓细粒棘球蚴的增殖。     

β-arrestin 2对急性支气管哮喘小鼠模型脾CD4^＋T细胞T-bet表达的影响

目的探讨β-arrestin 2在急性支气管哮喘（简称哮喘）小鼠模型脾CD4＋T细胞中的表达及对T-bet表达的影响。方法建立急性哮喘小鼠模型,免疫磁珠分离小鼠脾源性CD4＋T细胞,RNA干扰β-arrestin 2的表达后,检测CD4＋T细胞β-arrestin 2、T-bet mRNA和蛋白的表达。结果 siRNA-β-arrestin 2-1123沉默效果最佳,相对于未转染siRNA的哮喘组及其他siRNAβ--arrestin 2转染组,β-arrestin 2 mRNA明显降低（P〈0.01）;哮喘小鼠模型脾CD4＋T细胞β-arrestin 2蛋白的表达明显高于正常组（P〈0.01）;β-arrestin 2沉默后,哮喘小鼠脾CD4＋T细胞T-bet mRNA和蛋白的表达明显升高（P〈0.05）。结论β-arrestin 2可能通过抑制小鼠CD4＋T细胞T-bet的表达参与哮喘的发病。     

成人急性HBV感染后免疫指标的变化及不同转归的比较

目的 观察成人急性HBV感染后免疫指标的变化并进行不同转归比较。方法 选择29例急性乙肝患者和20例正常对照者，采用双抗体酶联分析法检测外周血细胞因子IL-2、IFN-γ、IL-4、IL-10和IL-12的水平；通过流式细胞仪观察外周血T淋巴细胞亚群变化；采用抗人T淋巴细胞单克隆抗体间接免疫荧光法观察外周血T淋巴细胞膜IFN-γ和IL-4的表达。结果29例HBeAg全部转阴，8例HBsAg未转阴。在HBsAg转阴组，病程早期和中期血清IL-2、IFN-γ、IL4及IL-12水平增高与正常组比P〈0．05，中期IL-4下降与早期比P〈0．05，晚期IL-2、IFN-γ、IL-4及IL-12下降与中期比P〈0．05；未转阴组各期IL-4水平增高与正常组比P〈0．05。转阴组早期Th1／Th2降低与对照组比P〈0．05，未转阴组各期，Th1／Th2降低与对照组比P〈0．05。未转阴组中5例入院时HBV-DNA〈10^3且IFN-γ水平明显低。两组CD4^＋／CD8^＋变化趋势不同。转阴组早期和中期IL-4膜表达高于正常对照组，中期IL-4表达低于早期，晚期IL-4表达低于中期，P值均〈0．05。未转阴组各期IL-4表达高于正常对照组，P〈0．05，各期之间IL-4表达无统计学差异。结论 IFN-γ升高与疾病恢复相关。持续高水平的IL-4表达易致慢性化。恢复Th1／Th2细胞的平衡可能是控制乙型肝炎慢性化的一条途径。CD4^＋／CD8^＋失调可能影响机体清除病毒的能力，导致感染的持续。     

β-arrestin2 stimulates interleukin-17 production and expression of CD4+ T lymphocytes in a murine asthma model

Allergic asthma is a complex and chronic inflammatory airway disease. Interleukin-17 is a pro-inflammatory cytokine which plays critical role in the pathogenesis of allergic asthma. It has been reported that β-arrestin2 regulated the development of allergic asthma at a proximal step in the inflammatory cascade. In this study, the influence of β-arrestin2 on Interleukin-17 production and expression of CD4+ T lymphocytes in a murine asthma model was investigated. Splenic CD4+ T lymphocytes from wild-type mice and those from a murine asthma model were purified. CD4+ T lymphocytes from a murine asthma model were transfected with siRNAs targeting the β-arrestin2 or were pretreated with the ERK1/2 inhibitor, PD98059. After stimulation, the protein expression of β-arrestin2、phosphorylated-ERK1/2 and IL-17 were detection by Western blot; the mRNA expression of IL-17 were detected by real-time PCR; the accumulation of IL-17 in supernatants were detected by ELISA. We found that β-arrestin2、phosphorylated-ERK1/2 and IL-17 expression in CD4+ T lymphocytes from a murine asthma model were increased compared with those from wild-type mice (p < 0.01). Treatment of CD4+ T lymphocytes with siRNAs targeting the β-arrestin2 down-regulated phosphorylated- ERK 1/2 and IL-17 expression (p < 0.01). PD98059 decreased IL-17 production and expression in CD4+ T lymphocytes in a murine asthma model (p < 0.05). We conclude that β-arrestin2 stimulated IL-17 production and expression of CD4+ T lymphocytes in a murine asthma model. The effect was partly mediated by ERK 1/2 activation. Targeting β-arrestin2 biological activity could be a valid therapeutic approach for the treatment of allergic asthma.     

地塞米松对哮喘小鼠CD4+CD25+调节性T细胞及IL-4、IL-10水平的影响

目的 探讨地塞米松对哮喘小鼠CD4+ CD25+调节性T细胞及IL-4、IL-10水平的影响.方法 30只雄性BALB/c小鼠随机分为三组:正常对照组、哮喘组和地塞米松组.利用卵清白蛋白腹腔注射和雾化吸入制备哮喘模型;通过流式细胞仪检测各组小鼠脾脏单个核细胞CD4+ CD25+调节性T细胞占CD4+T细胞的百分比;使用免疫组织化学方法分析各组IL-4在小鼠肺组织中的表达情况;用酶联免疫吸附试验检测各组小鼠血清IL-10的水平.结果 哮喘组脾脏单个核细胞CD4+CD25+调节性T细胞百分比及IL-10的表达水平较正常对照组和地塞米松组降低(P＜0.05),哮喘组IL-4水平较正常对照组和地塞米松组增高(P＜0.05).结论 地塞米松的抗炎作用可能通过上调CD4+ CD25+调节性T细胞、调节性T细胞亚群失衡的途径来实现.     

Allergic and nonallergic asthmatics have distinct patterns of T-cell activation and cytokine production in peripheral blood and bronchoalveolar lavage.

Activation of lymphocyte subpopulations was determined in conjunction with levels of cytokines in peripheral blood and bronchoalveolar lavage (BAL) of asthmatics. Allergic asthmatics had increased numbers of CD4+ IL-2R+ T cells in peripheral blood and BAL, and T-cell activation closely correlated with numbers of low-affinity IgE receptor (CD23) bearing B cells. In contrast, in nonallergic asthmatics both CD4+ and CD8+ T cells from blood and BAL had increased expression of IL-2R, HLA-DR, and VLA-1. Furthermore, in the nonallergic asthmatics CD8+ T cells were decreased in blood but increased in BAL. Cytokine levels were determined in BAL fluid and supernatants from purified peripheral blood T cells and enriched BAL lymphocyte preparations. Allergic asthmatics were characterized by increased levels of IL-4 and IL-5, and this elevated IL-4 contributed to the elevated IgE levels found in these allergic subjects. In contrast, nonallergic asthmatics had elevated levels of IL-2 and IL-5, with IL-2 contributing to T-cell activation. In both types of asthma, the close correlation of IL-5 levels with eosinophilia suggests that IL-5 is responsible for the characteristic eosinophilia of asthma. Thus, we provide evidence of distinct T-cell activation resulting in different spectra of cytokines in allergic and nonallergic asthma.     

低亲和力IgE受体与外源性支气管哮喘

本文对３０例外源性哮喘患者及３０例正常人的外周血单个核细胞（ＭＮＣ）低亲和力ＩｇＥ受体（即ＣＤ２３）表达、白细胞介素－４（ＩＬ－４）及血清ＩｇＥ水平进行测定。结果显示：发作组哮喘患者ＩｇＥ、ＩＬ－４、ＣＤ２３与缓解组及正常对照组之间有显著性差异（Ｐ＜０．０１）。且ＩｇＥ升高与ＣＤ２３呈正相关（ｒ＝０．８２７；Ｐ＜０．０１）。缓解组ＩｇＥ抗体、ＩＬ－４与正常对照组之间无显著性差异（Ｐ＞０．０５）；ＣＤ２３与正常对照组之间有显著性差异（Ｐ＜０．０ｌ）。以上结果表明了这一细胞因子的失衡与外源性哮喘的关系。     

Selective expression of the p70 subunit of the interleukin-2 receptor on lymphocytes from patients with infectious mononucleosis

The lymphocytosis manifested in infectious mononucleosis (IM) during acute phase is ascribed to a reactive expansion of CD8+ T lymphocytes caused by Epstein-Barr virus (EBV)-infected B lymphocytes. Expression of HLA-DR antigen on IM lymphocytes suggests that these T lymphocytes are somehow activated in vivo. In the present study, we analyzed the interleukin-2 (IL-2) receptor expression on lymphocytes from six patients with acute IM. Radiolabeled IL-2 binding assay revealed that IM lymphocytes from all patients examined had a considerable number of IL-2 binding sites with an intermediate affinity, although they did not express the IL-2 receptor recognized by anti-Tac antibody (p55). The number of binding sites (1,070 to 4,600 sites per cell) was larger than that of a normal, resting T lymphocyte-enriched population (650 sites per cell). Furthermore, IM lymphocytes showed marked proliferative responses to higher concentrations of IL-2, which were almost completely blocked by an anti-p70 IL-2 receptor antibody, indicating that their IL-2 receptor is a functional receptor. The results of an affinity cross-linking study seem to indicate that the IL-2 receptor expressed on IM lymphocytes is p70, the second chain of the IL-2 receptor distinct from p55. Flow cytometric analysis following immunofluorescent staining with anti-p70 IL-2 receptor antibody confirmed p70 expression on CD8+ HLA-DR+ lymphocytes. These data suggest that p70 IL-2 receptor expression is involved in the immune response triggered by EBV infection.     

TLR2对小鼠IL-17分泌的影响及其在抗结核免疫中的作用

目的通过检测TLR2-/-小鼠和WT小鼠脾脏CD4+T淋巴细胞在TLR2结核菌配体刺激下IL-17的表达水平,阐明TLR2对Th17细胞的作用及其在抗结核免疫的意义。方法选取TLR2-/-小鼠和WT小鼠各6只,分离出小鼠脾脏淋巴细胞与TLR2结核菌配体(19KD脂蛋白、Mtb、Pam3Cys-SK)共刺激培养3 d,通过流式细胞技术检测CD4+T细胞IL-17的表达水平。结果在TLR2结核菌配体刺激下,WT小鼠的CD4+T细胞分泌的IL-17高于TLR2-/-小鼠,在Mtb刺激下两者之间有统计学差异(P<0.05)。结论结核菌通过TLR2直接影响IL-17表达,从而发挥抗结核免疫作用。     

CD137分子对衰老小鼠T细胞活化的影响

目的观察CD137分子对衰老小鼠脾脏T细胞活化的影响,探讨该分子对衰老T细胞功能的调节作用.方法通过注射D-半乳糖建立亚急性衰老小鼠模型.分离青龄组、自然衰老组、对照组、衰老模型组小鼠的脾脏T细胞,分别用ConA或ConA CD137单抗活化24 h,采用流式细胞术测定T细胞的凋亡率,ELISA测定细胞培养上清IL-2浓度.结果自然衰老组及衰老模型组小鼠的脾脏T细胞静息培养及活化培养后的凋亡率均显著高于青龄组及对照组;ConA CD137单抗活化组的衰老T细胞的凋亡率低于ConA活化组,其培养上清IL-2浓度高于ConA活化组.结论 CD137作为T细胞活化的共刺激分子能促进衰老T细胞活化后的存活及IL-2的分泌,这有助于提高衰老T细胞的功能.     

肺表面活性物质对哮喘T细胞亚群细胞周期及其调节蛋白的影响

目的 观察肺表面活性物质(PS)对发作期哮喘患者T细胞亚群细胞周期及其调节蛋白的影响,揭示PS对CD4+、CD8+T细胞增殖周期的具体作用机制及其在哮喘治疗中的意义.方法 利用细胞培养技术,通过体外PS干预,流式细胞仪测定经PS干预和未经PS干预的CD4+、CD8+T细胞的细胞周期分布和CD4+、CD8+T细胞内细胞周期调节蛋白p27kipl、cyclinE、cyclinA、cyclinB的表达水平.结果 哮喘患者CD4+、CD8+T细胞分别与PS体外共同培养后,加PS组的S期、G2/M期的CD4+T比例显著低于对照组(P＜0.01);G0/G1期的CD4+T细胞比例显著高于对照组(P＜0.01).加PS组的S期CD8+T比例显著低于对照组(P＜0.01);G2期的CD8+T细胞比例略低于对照组,但差异无统计学意义(P＞0.05);G0/G1期的CD8+T细胞比例高于对照组(P＜0.05).CD4+T细胞内p27kipl的表达水平高于对照组(P＜0.05);CD4+T细胞内cyclinE表达水平显著低于对照组(P＜0.01);CD4+T细胞内cyclinA、cyclinB的表达水平低于对照组(P＜0.05).CD8+T细胞内p27kipl的表达水平高于对照组(P＜0.05);CD8+T细胞内cyclinE、cyclinA表达水平低于对照组(P＜0.01);CD8T细胞内cyclinB的表达水平与对照组差异无统计学意义(P＞0.05).结论 PS通过抑制CD4+T细胞的正性细胞周期调节蛋白cyclinE、cyclinA、cyclinB的表达和上调其负性细胞周期调节蛋白p27kipl的表达,抑制CD4+T细胞的DNA合成和细胞分裂,进而抑制CD4+T细胞增殖;通过下调CD8+T细胞内cyclinE、cyclinA的表达,上调p27kippl的表达,抑制CD8+T细胞DNA合成.

Abstract：

Objective The aim of this study was to observe the effect of pulmonary surfactant (PS)on the cell cycle distribution and expression of cell cycle regulatory proteins in T lymphocyte subsets in patients with asthma attack and evaluate the molecular regulatory mechanism of PS on T lymphocyte subsets cell proliferation cycle during asthma attack and its therapy significance. Methods The CD4+、CD8+ T lymphocytes obtained from peripheral blood of 30 patients with asthma attack were incubated with PS,the cell cycle and the expression of p27kipl , CyclinE, CyclinA, CyclinB in CD4+ , CD8+ T lymphocytes with PS and without PS were anasyzed by flow cytometry. Results CD4 + T lymphocytes with PS progressed into S phase and G2/M phase were significantly lower than those without PS( P ＜0.01). But remained in G0/G1 phase were significantly higher than those without PS (P ＜ 0.01). CD8+ T lymphocytes with PS progressed into S phase were significantly lower than those without PS( P ＜0.01),G2/M phase were little lower than those without PS( P ＞ 0.05), Go/G1 phase were higher than those without PS( P ＜0.05). The expression of p27kipl in CD4+T lymphocytes with PS was higher than that without PS( P ＜0.05). The expression of cyclinE in CD4+ T lymphocytes with PS was significantly lower than that without PS( P ＜0.01 ). The expression of cyclinA,cyclinB in CD4+ T lymphocytes with PS were lower than those without PS( P ＜0.05). The expression of p27kipl in CD8+ T lymphocytes with PS was higher than that without PS( P ＜0.05). The expression of cyclinE and cyclinA in CD8+ T lymphocytes with PS were significantly lower than that without PS( P ＜0. 01). The expression of cyclinB in CD8+ T lymphocytes with PS was little lower than that without PS( P ＞0.05). Conclusions During asthma attack,PS can inhibit the DNA synthesis, cell division and proliferation of CD4+T lymphocytes by inhibiting positive cell cycle regulatory proteins cyclinE, cyclinA, cyclinB expression and increasing negative cell cycle regulatory protein p27kipl expression in CD4+ T lymphocytes. PS can inhibit the DNA synthesis of CD8+ T lymphocytes by inhibiting positive cell cycle regulatory proteins cyclinE, cyclinA,expression and increasing negative cell cycle regulatory protein p27kipl expression in CD8+ T lymphocytes.