Cellular Senescence and SENEX Gene on the Peripheral CD4+CD25+ Treg Cells Enhancement in Elderly

Cellular senescence is a signal transduction process which maintained genomic stability and stopped mammalian cell growth. Furthermore, cellular senescence induces a protective response to a variety of DNA damage. However, this process is also associated with apoptosis, upregulated secretion of inflammatory cytokine, and promoted surrounding tissue damage. When cellular senescence accumulates to a certain extent, it triggers geriatric diseases, such as chronic inflammation, immune senescence-associated tumors and incontrollable infections. Cellular senescence gene SENEX, which was cloned in 2004, has been demonstrated to play a unique gatekeeper function in human endothelial cells when stress-induced pre-mature senescence and apoptosis occurr. The phenomenon that CD4+CD25+ Treg cells accumulated in the aged population has been well studied in recent years. Now Treg accumulation related to immune-pathology has attracted more interest. CD4+CD25+ Treg did not decline and age, but accumulated and suppressed immunoreaction. The enhanced Treg number and function may be associated with stress-induced premature senescence-mediated unique cellular senescence protection mechanisms, and SENEX may play a critical role in this process. In this article, we summarize the cellular senescence and SENEX gene in the accumulation and functional activity of CD4+CD25+ Treg in the elderly.

外周血CD4^(+)CD25^(+)Treg细胞、TLR4、hCMV-IgM与动脉粥样硬化型急性脑梗死患者颈动脉粥样硬化的关系

目的探讨外周血CD4^(+)CD25^(+)Treg细胞、TLR4、人巨细胞病毒(hCMV)-IgM与动脉粥样硬化型急性脑梗死(As-ACI)患者颈动脉粥样硬化的关系。方法选取89例As-ACI患者(脑梗死组),另选取健康体检者43例(对照组)。根据颈内动脉超声结果将As-ACI患者分为内膜正常组、内膜增厚组、斑块组、狭窄组。比较各组外周血CD4^(+)CD25^(+)Treg细胞水平、单个核细胞TLR4表达水平、hCMV-IgM抗体阳性率和内膜中膜厚度(IMT)。分析As-ACI患者颈动脉狭窄的危险因素,分析CD4^(+)CD25^(+)Treg细胞、TLR4与IMT的相关性及其对颈动脉狭窄的预测价值。结果脑梗死组CD4^(+)CD25^(+)Treg细胞、HDLC水平低于对照组,TLR4表达、hCMV-IgM抗体阳性率、TC、TG、LDLC、hs-CRP水平、IMT高于对照组(P<0.05)。内膜正常组、内膜增厚组、斑块组、狭窄组CD4^(+)CD25^(+)Treg细胞水平依次降低,TLR4表达、hCMV-IgM抗体阳性率、IMT依次增高(P<0.05)。CD4^(+)CD25^(+)Treg细胞水平与IMT呈负相关,TLR4表达与IMT呈正相关(P<0.05)。高血压、CD4^(+)CD25^(+)Treg表达、TLR4表达、hCMV-IgM抗体阳性是As-ACI患者颈动脉狭窄的危险因素(P<0.05)。CD4^(+)CD25^(+)Treg细胞、TLR4表达水平联合检测的预测价值高于单独检测(P<0.05)。结论外周血CD4^(+)CD25^(+)Treg细胞、TLR4、hCMV-IgM抗体阳性率与As-ACI患者颈动脉粥样硬化进展有关,外周血CD4^(+)CD25^(+)Treg细胞、TLR4联合可以较好预测病变过程。

Correlation between CD4^＋CD25^＋Treg Cells and CCR4 in Nasopharyngeal Carcinoma

OBJECTIVE CD4^＋CD25^＋ T regulatory （Treg） cells are a population of T cells which suppress an overactive immune system. CCR4 is a chemokine receptor involved in the recruitment of lymphocytes. Nasopharyngeal carcinoma （NPC） is resistant to immunosurveillance, owing to the increased number of tumor-infiltrating Treg cells which are recruited to the tumor bv CCR4.

EBV感染与鼻咽癌患者CD4+CD25+Treg及相关细胞因子的相关性分析

目的:探讨EB病毒(EBV)感染与鼻咽癌(NPC)患者CD4+CD25+调节性T细胞(Treg)及相关细胞因子[白介素-17(IL-17)、白介素-10(IL-10)]的相关性。方法:选取2019年1月—2022年12月间收治的120例NPC患者作为研究对象,并纳入鼻咽炎患者30例和同期体检健康者30例作为参照,比较各组外周血CD4+CD25+Treg及IL-17、IL-10的水平;采用Spearman相关分析法分析NPC患者EBV DNA与CD4+CD25+Treg、IL-17、IL-10水平的相关性。结果:NPC患者CD4+CD25+Treg、IL-10水平均高于鼻咽炎患者和体检健康者(P<0.05),IL-17水平低于鼻咽炎患者和体检健康者(P<0.05)。ROC曲线显示,外周血CD4+CD25+Treg诊断NPC患者发生EBV感染的临界值为5.42%,AUC为0.867,诊断敏感度为89.65%,特异度为87.10%。Spearman相关分析显示,EBV DNA与NPC患者外周血CD4+CD25+Treg、IL-10呈正相关,与IL-17呈显著负相关性(P均<0.05)。logistics回归分析显示,CD4+CD25+Treg>5.42%是影响NPC合并EBV感染的独立危险因素(OR=2.062,95%CI 1.574~2.703,(P<0.05));结论:EBV感染与鼻咽癌发病密切相关,其作用机制可能与CD4+CD25+Treg及相关细胞因子有关。

CD4+CD25+Foxp3+Treg在子痫前期患者外周血中表达的意义及与妊娠结局的相关性分析

目的分析CD4+CD25+叉头框蛋白3(Foxp3)+调节性T淋巴细胞(Treg)在子痫前期(PE)患者外周血表达中的意义及与妊娠结局的相关性。方法选取2020年1月~2023年1月收治的112例PE患者为疾病组,另根据年龄、孕周匹配选取健康孕妇60例为健康组。疾病组中根据疾病严重程度分为轻度组与重度组。比较外周血CD4+CD25+Foxp3+Treg水平差异及不良妊娠结局发生率。疾病组根据是否存在妊娠不良结局分为不良组与良好组。对比良好组与不良组患者临床资料。Logistic回归分析影响PE患者不良妊娠结局的因素。Spearman相关性分析法分析CD4+CD25+Foxp3+Treg与不良妊娠结局的相关性。结果疾病组、轻度组、重度组CD4+CD25+Foxp3+Treg百分比均低于健康组,不良妊娠结局发生率均高于健康组(P<0.01)。疾病组、重度组CD4+CD25+Foxp3+Treg百分比均低于轻度组,不良妊娠结局发生率高于轻度组(P<0.01),重度组CD4+CD25+Foxp3+Treg百分比低于疾病组,不良妊娠结局发生率高于疾病组(P<0.01)。不良组的孕前体质量指数(BMI)、24 h尿蛋白定量高于良好组,终止妊娠时间早于良好组,外周血CD4+CD25+Foxp3+Treg百分比均低于良好组,差异有统计学意义(P<0.001);Logistic回归分析显示孕前BMI、终止妊娠时间、24 h尿蛋白定量、外周血CD4+CD25+Foxp3+Treg百分比均是导致不良妊娠结局的独立危险因素(P<0.001)。Spearman相关性分析显示外周血CD4+CD25+Foxp3+Treg水平与不良妊娠结局呈负相关(r=-0.722,P<0.01)。结论PE患者外周血CD4+CD25+Foxp3+Treg表达水平异常低表达,是导致不良妊娠结局发生的独立危险因素,且与不良妊娠结局的发生成负相关。

血清IL-18、IL-22、CD4^(+)CD25^(+)CD127^(low)Treg水平联合检测对狼疮性肾炎患者活动期的诊断效能

目的:分析血清白细胞介素-18(IL-18)、白细胞介素-22(IL-22)、CD4^(+)CD25^(+)CD127^(low)调节性T细胞(Treg)水平联合检测对狼疮性肾炎患者活动期的诊断效能。方法:回顾性分析2022年1月至2023年9月该院收治的64例狼疮性肾炎患者的临床资料,设为研究组,并根据病情严重程度将其分为活动期、稳定期,另选取同期64名健康体检者设为对照组。比较两组及不同病情严重程度患者血清IL-18、IL-22、CD4^(+)CD25^(+)CD127^(low)Treg水平,并分析各指标水平与狼疮性肾炎患者病情严重程度的相关性,采用受试者工作特征(ROC)曲线分析各指标水平单项及联合检测对狼疮性肾炎患者活动期的诊断效能。结果:研究组血清IL-18、IL-22水平均高于对照组,CD4^(+)CD25^(+)CD127^(low)Treg水平低于对照组,差异有统计学意义(P<0.05);活动期患者血清IL-18、IL-22水平均高于稳定期患者,CD4^(+)CD25^(+)CD127^(low)Treg水平低于稳定期患者,差异有统计学意义(P<0.05);Pearson相关性分析结果显示,血清IL-18、IL-22水平与狼疮性肾炎患者病情严重程度均呈正相关(r>0,P<0.05),CD4^(+)CD25^(+)CD127^(low)Treg水平与狼疮性肾炎患者病情严重程度呈负相关(r<0,P<0.05);ROC曲线分析结果显示,血清IL-18、IL-22、CD4^(+)CD25^(+)CD127^(low)Treg水平单项及联合检测诊断狼疮性肾炎患者活动期的曲线下面积分别为0.828、0.817、0.788、0.921,联合检测诊断效能高于三者单项检测。结论:IL-18、IL-22、CD4^(+)CD25^(+)CD127^(low)Treg水平联合检测诊断狼疮性肾炎患者活动期的效能高于三者单项检测。

RhoA、CD4^(+)CD25^(+)调节性T细胞、MYBL2在胃癌患者中的表达及对预后和生存时间的影响

目的:探讨RhoA、CD4^(+)CD25^(+)调节性T细胞、成髓细胞瘤转录因子第2亚型(MYBL2)在胃癌患者中的表达及对预后和生存时间的影响。方法:选取2017年1月至2019年1月于本院就诊的134例胃癌患者术后癌组织标本作为研究对象,另选取其中62例胃癌患者相应的癌旁组织标本及40例同期非胃癌患者正常胃黏膜组织标本进行对照,检测癌组织、癌旁组织、正常胃黏膜组织中RhoA、CD4^(+)CD25^(+)调节性T细胞、MYBL2的表达情况,分析其对胃癌预后及生存时间的影响。结果:RhoA,CD4^(+)CD25^(+)调节性T细胞、MYBL2在癌组织中的阳性率均明显高于癌旁组织和正常胃黏膜组织(P<0.05)。胃癌患者术后平均生存时间为(28.61±1.34)个月,其中RhoA、CD4^(+)CD25^(+)调节性T细胞、MYBL2阳性患者的生存时间均短于阴性患者(P<0.05)。RhoA(+)、CD4^(+)CD25^(+)调节性T细胞(+)、MYBL2(+)是胃癌患者预后的危险因素(P<0.05)。结论:检测RhoA,CD4^(+)CD25^(+)调节性T细胞、MYBL2的表达可作为胃癌病情严重程度、预后及生存时间评估的重要补充手段。

An Association between Immunosenescence and CD4^+CD25^+ Regulatory T Cells: A Systematic Review

Objective Age-related increment of the prevalence of CD4^＋CD25^＋ regulatory T （Treg） cells were described controversially, and whether such changes explain immune dysfunction in the elderly is still unclear. The aim of this systematic review is to evaluate the role of the Tregs in immunosenescence. Methods Medline and manual searches were performed to identify all published epidemiological and animal studies investigating the efficacy of the association between immunosenescence and Treg cells. Results It was founded that the frequency, phenotypic characteristics, and number/function of Tregs were altered significantly with aging. Medical conditions in individuals with advanced ageas well as apoptosis intensity of Treg cells had an impact on the accumulation of Tregs which in turn could deteriorate cytotoxic activity of CD8＋ T and NK cells and production of IL-2. The range of immune cells that could be suppressed by Treg cells was quite wide and covered CD4^＋CD25^＋ T cells, NK cells, dendritic cells and even monocytes. These changes were observed both in humans and experimental animals. Besides, it was believed that frequency of Tregs increased with age and was accompanied by intensified suppressive activity for Tregs in patients, for example, with Alzheimer disease （AD） and Parkinson disease （PD）. The impaired condition of CD4＋ T cells, so-called immunosenescence, rendered transplant recipients less responsive to an allogeneic kidney graft, an effect that was limited to transplant recipients who were aged over 60 years. Conclusions Treg cells are associated with immunosenescence. All these changes contribute to the aging-related decline of immune responses and lead to the higher risk of immune-mediated diseases, cancer or infections in aged individuals.

Analysis of CD4^+CD25^+ Regulatory T Cells and Foxp3 mRNA in the Peripheral Blood of Patients with Asthma

The changes of CD4^＋CD25^＋ regulatory T cells （CD4^＋CD25^＋ Treg） and Foxp3 mRNA in peripheral blood mononuclear cells （PBMCs） from patients with asthma were investigated in order to elucidate the possible roles of CD4^＋CD25^＋ Treg in the development of asthma. The peripheral blood samples were collected from 29 healthy controls （normal control group） and 78 patients with asthma which included 30 patients in exacerbation group, 25 patients in persistent group, and 23 patients in remission group. By using flow cytometry and RT-PCR, the CD4^＋CD25^＋ Treg ratio and Foxp3 mRNA in PBMCs were detected. The CD4^＋CD25^＋ Treg ratio and Foxp3 mRNA in PBMCs of exacerbation and persistent groups were lower than that of remission and normal control groups （P〈0.05）. Although the CD4^＋CD25^＋ Treg ratio and Foxp3 mRNA of remission group were also lower than that of normal control group, there was no significant difference between them （P〉0.05）. As compared with persistent group, exacerbation group had lower CD4^＋CD25^＋ Treg ratio and Foxp3 mRNA （P〈0.05）. It was indicated that the decrease of CD4^＋CD25^＋ Treg ratio and its function in PBMCs may be responsible for pathogenesis of asthma.

Depletion of CD4^+CD25^+ regulatory T cells can promote local immunity to suppress tumor growth in benzo[a]pyrene-induced forestomach carcinoma

AIM： To elucidate the distribution of CD4^＋CD25^＋ regulatory T cells （Tregs） in different lymphoid tissues and its local enhancement on tumor growth before and after depletion of CD4^＋CD25^＋ Tregs. METHODS： Female ICR mice were garaged with benzo[a]pyrene （BaP） to induce forestomach carcinoma. CD4^＋CD25^＋ Tregs were intraperitoneally depleted with monoclonal antibody PC61. These mice were divided into BaP-only, BaP ＋ IgG, BaP ＋ PC61, and control groups. The forestomach of mice was dissected for histological analysis, and tunnel test was performed for apoptosis of tumor cells. CD4^＋CD25^＋ Tregs were sorted from different lymphoid tissues and expression of Foxp3, IL-10, and chemokine receptors was analyzed by flow cytometry, semi-quantitative and veal-time polymerase chain reaction. RESULTS： The mice gavaged with only BaP showed increased forestomach papilloma and carcinoma at wk 16 and 32. The proportion of CD4^＋CD25^＋ Tregs was significantly higher in peri-stomach regional lymph nodes than in other lymphoid tissues. These CD4^＋CD25^＋ Tregs in regional lymph nodes expressed higher levels of Foxp3 and IL-10, enriched in the CD62L-subset, and CCR1 and CCR5 chemokine receptors. In mice gavaged with BaP ＋ PC61, the number of tumor nodules and tumor volume decreased significantly with massive infiltrating cells and apoptosis of tumor cells. In the draining regional lymph nodes, the number of CD4^＋CD25^＋ Tregs also decreased significantly. CONCLUSION： Inducible and activated CD4^＋CD25^＋ Tregs in the draining regional lymph nodes suppress host local immunity during tumor growth. Depletion of CD4^＋CD25^＋ Tregs can promote host local immunity to suppress tumor growth.

Downregulation of CD4+CD25+ regulatory T cells may underlie enhanced Th1 immunity caused by immunization with activated autologous T cells

Regulatory T cells （Treg） play important roles in immune system homeostasis, and may also be involved in tumor immunotolerance by suppressing Th1 immune response which is involved in anti-tumor immunity. We have previously reported that immunization with attenuated activated autologous T cells leads to enhanced anti-tumor immunity and upregulated Thl responses in vivo. However, the underlying molecular mechanisms are not well understood. Here we show that Treg function was significantly downregulated in mice that received immunization of attenuated activated autologous T cells. We found that Foxp3 expression decreased in CD4＋CD25＋ T cells from the immunized mice. Moreover, CD4＋CD25＋Foxp3＋ Treg obtained from immunized mice exhibited diminished immunosuppression ability compared to those from naive mice. Further analysis showed that the serum of immunized mice contains a high level ofanti-CD25 antibody （about 30 ng/ml, p〈0.01 vs controls）. Consistent with a role ofanti-CD25 response in the downregulation of Treg, adoptive transfer of serum from immunized mice to naive mice led to a significant decrease in Treg population and function in recipient mice. The triggering of anti-CD25 response in immunized mice can be explained by the fact that CD25 was induced to a high level in the ConA activated autologous T cells used for immunization. Our results demonstrate for the first time that immunization with attenuated activated autologous T cells evokes anti-CD25 antibody production, which leads to impeded CD4＋CD25＋Foxp3＋ Treg expansion and function in vivo. We suggest that dampened Treg function likely contributes to enhanced Thl response in immunized mice and is at least part of the mechanism underlying the boosted anti-tumor immunity.

Changes of CD4^+CD25^+ Regulatory T Cells in Patients with Acute Coronary Syndrome and the Effects of Atorvastatin

The function of CD4＋CD25＋ regulatory T lymphocytes （Treg） in patients with acute coronary syndrome （ACS） and the effects of atorvastatin were investigated. Forty-eight patients with ACS were randomly divided into two groups： group C receiving conventional therapy （n=24）, and group C＋A receiving conventional therapy＋atorvastatin （10 mg/day, n=24）. T lymphocytes from ACS patients （before and 2 weeks after the treatment） or 18 healthy subjects were separated and the flow cytometry was used to measure the percentage of Treg. The inhibitory ability of Treg on effector T cells was determined by mixed lymphocyte reaction （MLR）. ELISA was used to measure the serum levels of cytokines （IL-10, TGF-β1 and IFN-γ） before and after treatment. The results showed that as compared with normal control group, Treg percentage was decreased significantly （P〈0.01）, the inhibitory ability of Treg on the T lymphocytes proliferation was reduced （P〈0.01）, IFN-γ levels were increased and IL-10 and TGF-β1 levels were lowered in ACS patients. After treatment with atorvastatin, Treg percentage and the inhibitory ability of Treg on T lymphocytes proliferation were significantly increased in ACS patients. Serum IFN-γ was decreased significantly, while IL-10 and TGF-β1 were elevated significantly as compared with the non-atorvastatin group. The number of Treg was positively correlated with serum TGF-β1, but negatively with serum IFN-γ and CRP. It was concluded that ACS was associated with decreased number and defected function of Treg, which may play an important role in initiating immune-inflammatory response in ACS. The inhibitory effects of atorvastatin on inflammation in ACS may be due to its beneficial effects on Treg and restoration of immune homeostasis.

Increase of CD4^+CD25^+ T cells in Smad3^(-/-) mice

AIM： To investigate the changes of lymphocyte subpopulations, especially CD4^＋CD25^ T regulatory cells in Smad3^-/- mice. METHODS： Hematological changes and changes of lymphocyte subpopulations were detected in Smad3＂/- mice using cell counter and flow cytometry, respectively, and compared to their littermate controls. RESULTS： The numbers of neutrophils and lymphocytes in peripheral blood were significantly increased in Smad3^-/- mice compared to littermate controls. CD19^＋ expressing cells in blood and spleen, and CD8^＋ T cells in thymus were all markedly decreased in Smad3^-/- mice. More important, Smad3^-/- mice had an increased population of CD4^＋CD25^＋ T cells in peripheral lymphoid tissues, including thymus, spleen, and lymph nodes. CONCLUSION： These observations suggest that the changes of lymphocyte subpopulations might play a role in susceptibility to inflammation of Smad3^-/- mice.

Influence of Danshen Injection on airway inflammation and CD4^+ CD25^+ regulatory T cells of asthmatic rats

Objective： To investigate the influence of Danshen Injection on airway inflammation and CD4^＋CD25^＋ regulatory T cells（CD4^＋CD25^＋ Tr） of asthmatic rats, and elucidate the possible mechanism of Danshen Injection in treatment of asthma. Methods： 30 Wister rats were randomly divided into control group, asthma group and Danshen Injection treated group. Bronchoalveolar lavage fluids （BALF） were collected, and cytology studies were conducted. Lung tissues were obtained and pathologic analyses were done with hematoxylin and eosin stain （HE）. Flow cytometry was used to detect the CD4^＋CD25^＋ Tr ratio in peripheral blood mononuclear cells （PBMCs）. Results： Total cell, the percentage of lymphocytes, neutrophils and eosinophils （Eos） in BALF of Danshen Injection-treated group were lower than that in asthma group （P〈0.05, P〈0.01）. Compared with asthma group, less infiltration of inflammatory cells in lung tissues was observed in Danshen Injection-treated group. CD4^＋CD25^＋ Tr of asthma group was lower than that of control and Danshen Injection treated group （P〈0.05）. Conclusion： Danshen Injection can suppress airway inflammation of asthmatic rats, probably by increasing the number of CD4^＋CD25^＋ Tr.

儿童咳嗽变异性哮喘外周血CD4^+CD25^+CD127^(lo/-)Treg及IL-17表达水平与肺炎支原体DNA的关系

儿童咳嗽变异性哮喘（cough variant asthma,CVA）是一种潜在、隐匿形式哮喘,临床常无感染征象。近年来有学者提出该病可能与某些病原体感染密切相关[1]。研究发现,肺炎支原体（Mycoplasma pneumonia,MP）感染可诱发哮喘,且与哮喘发作及恶化有关。CVA是由多种细胞和细胞因子共同参与的气道慢性炎症性疾病,CD4＋CD25＋调节性T细胞（regulatory T cell,Treg）有可能在支气管哮喘的发生发展中发挥着重要作用。

慢性乙型肝炎患者外周血CD4^＋CD25^＋Treg与CD4^＋和CD8^＋ T淋巴细胞亚群的相关研究

目的:探讨慢性乙型肝炎患者外周血中CD4+CD25+调节性T细胞的含量和CD4+CD8+T淋巴细胞亚群分布,两者之间相关性及与HBV的相关性。方法:采用流式细胞术检测50例慢性乙型肝炎患者和20例健康对照者外周血中CD4+CD25high、CD4+CD25+Foxp3+Treg细胞表达及CD3/CD4/CD8 T淋巴细胞亚群,荧光定量PCR法检测HBV DNA含量。结果:慢性乙型肝炎患者外周血中CD4+CD25highTreg明显高于健康对照组(P<0.01),且随HBV DNA载量增加,患者外周血中CD4+CD25highTreg细胞的水平逐渐升高。慢性乙型肝炎患者外周血中CD4+CD25+Foxp3+Treg细胞也相应增高,且与CD4+CD25highTreg细胞的变化成正相关(r=0.890,P<0.001)。与健康对照组比较,患者组CD4+T细胞百分率及CD4+/CD8+比值均降低,而CD3+T细胞和CD8+T细胞百分率差异无显著性(P>0.05)。CD4+CD25highTreg细胞与HBV DNA取对数后成正相关(r=0.782,P<0.001),与谷丙转氨酶(ALT)成正相关(r=0.432,P<0.005);与CD3+、CD4+、CD8+T细胞水平及CD4+/CD8+比值均无相关性(P>0.05)。CD3+、CD4+、CD8+T淋巴细胞及CD4+/CD8+比值与HBV DNA载量之间亦无相关性(P>0.05)。结论:慢性乙型肝炎患者外周血中CD4+CD25+Treg细胞增高,且与HBV的复制水平及ALT增高具有一致性,而T细胞亚群是否可作为监测CHB患者免疫状态的指标需进一步探讨。

斑秃患者外周血CD4^+ CD25^+ Treg细胞计数及TGF-β_1的表达

目的通过检测斑秃患者外周血中CD4+CD25+Treg细胞计数、转化生长因子-β1(TGF-β1)的表达水平,探讨斑秃的发病机制。方法采用流式细胞技术检测50例未治疗的斑秃患者外周血中CD4+CD25+Treg细胞的水平变化,ELISA法检测血清中TGF-β1含量,并进行相关性分析,以30例健康者作为正常对照。结果斑秃患者组外周血CD4+CD25+Treg细胞占T淋巴细胞的比率和血清TGF-β1浓度均低于正常对照组(P均<0.01),且重型患者组显著低于正常对照与局限型患者组(P<0.01),局限型患者组低于正常对照组(P<0.05)。斑秃患者外周血CD4+CD25+Treg细胞水平,血清中TGF-β1含量均与SALT评分呈显著负相关(r=-0.566,-0.471;P均<0.01),而两者呈显著正相关(r=0.584,P<0.01)。结论斑秃患者外周血中CD4+CD25+Treg细胞与血清中TGF-β1呈一定相关性,且两者与斑秃病情的严重程度相关;CD4+CD25+Treg细胞的数量减少和TGF-β1表达降低可能与斑秃的细胞免疫失调有关。

再生障碍性贫血外周血Th17和CD4^+ CD25^+ Treg细胞表达情况研究

本研究旨在探讨成人再生障碍性贫血(aplastic anemia,AA)外周血Th17和CD4+CD25+调节性T细胞(Treg)表达情况。45例初发AA患者分为轻型AA(n=25)和重型AA(n=25)两组,15例正常人作为对照。应用流式细胞术检测AA患者外周血中Th17和CD4+CD25+Treg的比例,ELISA检测血清及刺激后外周血单个核细胞(PBMNC)上清液中的白介素(IL-17)、γ干扰素(IFN-γ)及肿瘤坏死因子-α(TNF-α)水平,并与正常对照组比较。结果表明:重型AA(SAA)组外周血Th17细胞比例,血清中IL-17及IFN-γ表达高于轻型AA(MAA)和正常人组,而重型AA组外周血CD4+CD25+Foxp3+Treg细胞比例降低。与轻型AA和正常对照相比,重型AA患者单个核细胞培养后上清液中IL-17及IFN-γ表达水平显著增加。AA患者血红蛋白计数与Th17细胞及血清IL-17表达呈负相关,与CD4+CD25+Treg表达成正相关。结论:重型AA患者外周血Th17细胞应答增强,而CD4+CD25+Treg细胞缺乏,贫血的严重程度与外周血Th17/Treg免疫应答失衡密切相关。

妊娠浓度的雌激素对诱导CD4^+CD25^-naive T细胞转化为CD4^+CD25^+Treg细胞的影响

目的体外观察妊娠浓度的雌激素能否诱导CD4+CD25-naive T细胞转化为CD4+CD25+Treg细胞,并探讨其相关性。方法以CD4+CD25-T细胞作为反应细胞,实验组加入妊娠水平的雌激素(E2)及CD3/CD28单抗作为刺激原培养72 h,设阴性对照组(仅加入CD3/CD28单抗)和空白对照组。72 h后检测各组中CD4+CD25+T细胞和CD4+Foxp3+T细胞比例变化及Foxp3 mRNA表达。结果1)阴性对照组CD4+CD25+T细胞比例较空白对照组显著增高(P<0.001),而实验组CD4+CD25+T细胞比例进一步升高(P<0.001)。2)阴性对照组不能诱导CD4+Foxp3+T细胞比例增高,但实验组CD4+Foxp3+T细胞的比例则较其它2组均显著升高(P<0.001)。3)RT-PCR提示阴性对照组Foxp3 mRNA的表达量较空白对照组无显著差异(P>0.05);而实验组Foxp3 mRNA的表达量较其它2组均显著升高(P<0.001)。结论体外淋巴细胞刺激实验提示妊娠状态下雌激素的高水平与CD4+CD25+Foxp3+Treg细胞比例的升高密切相关。

射干麻黄汤对哮喘小鼠气道重塑及Th17/CD4^+CD25^+ Treg细胞的影响及机制研究

目的探讨射干麻黄汤干预哮喘小鼠后Th17/CD4^+CD25^+调节性T细胞(CD4^+CD25^+Treg),TGF-β1蛋白表达的变化及其与气道重塑之间的关系。方法 24只Balb/c小鼠随机分为3组,空白组(A组)、模型组(B组)、射干麻黄汤组(C组),每组8只。建立慢性哮喘小鼠模型后,分别给予不同干预方式,观察雾化8周后肺组织气道重塑程度并检测TGF-β1蛋白表达、Th17细胞及CD4^+CD25^+Treg细胞占CD4^+T细胞百分比。结果B、C组激发8周小鼠支气管管壁厚度、平滑肌厚度均较A组厚(P<0.05),但C组较B组薄(P<0.05)。B、C组相较于A组,Th17细胞占CD4^+T细胞的百分比增高,CD4^+CD25^+Treg细胞占CD4^+T细胞的百分比降低(P<0.05);C组较B组Th17细胞占CD4^+T细胞的百分比增高程度减少(P<0.05),CD4^+CD25^+Treg细胞占CD4^+T细胞百分比降低程度减小(P<0.05)。B组TGF-β1蛋白表达与A组比较均增加(P<0.05),而C组TGF-β1蛋白表达与A组比较差别无统计学意义(P>0.05)。C组TGF-β1蛋白表达较B组TGF-β1蛋白降低(P<0.01)。结论射干麻黄汤可能通过抑制TGF-β1蛋白表达,减少哮喘小鼠Th17细胞数,增加CD4^+CD25^+Treg细胞数,进而调节Th17/CD4^+CD25^+Treg的免疫紊乱从而延缓气道重塑。