Involvement of CD4^＋CD25^＋ regulatory T cells in the pathogenesis of polycythaemia vera

Background Regulatory T cells （mreg） have been shown to play an important role in the regulation of hematopoietic activity. However, there is no information about the effect of Treg cells in the pathogenesis of polycythaemia vera （PV）. Methods In this study, we investigated the percentage and function of Treg cells in the peripheral blood of 21 PV patients and 25 healthy donors, mreg cells were identified and characterized as CD4^＋CD25^＋FOXP3^＋ by flow cytometry. The suppressive activity of CD4^＋CD25^＋ Treg cells was assessed by the proliferation and cytokine secretion of the co-cultured CD4^＋CD25^- fractions. Results The results showed that the percentage of Treg cells in the peripheral blood of PV patients significantly increased compared to healthy controls （（10.93±4.02）% vs （5.86±1.99）%, P 〈0.05）. Moreover, the mRNA and protein expression of FOXP3 was higher in CD4^＋CD25^＋ Treg cells. Coordinately, when co-cultured with the activated CD4^＋CD25^- cells, the CD4^＋CD25^＋ Treg cells showed enhanced suppressive function in PV. Yet, the underlying mechanism for the increased frequency and function of CD4^＋CD25^＋ Treg cells is still to be clarified. Conclusion Treg cells expansion might account for the abnormal T cell immunity in PV patients and thus contribute to the pathogenesis of PV.     

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 exac-erbation 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.     

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.     

CD4^＋CD25^high Regulatory Cells in Peripheral Blood of NSCLC Patients

The proportion and changes of CD4 CD25high regulatory T cells (Trs) in peripheral blood of non-small cell lung cancer (NSCLC) patients were analyzed and their clinical significance explored. The peripheral blood was collected from 61 patients with NSCLC and 15 healthy controls. By using monoclonal antibodies, the blood samples were evaluated with the flow cytometry for lymphocyte subsets (CD3 , CD4 and CD8 ) and CD4 CD25high Tr cells. The results showed that the proportion of CD4 CD25high Tr cells in NSCLC group was significantly higher than in control group [(4.36±2.07) % vs (2.04±1.03) %, P<0.01]. The proportion of CD4 CD25 high Tr cells in late stage was higher than that in early stage [stages I II (2.26 0.6) %; stage III (3.28 1.38) %; stage IV (6.06±4.08) %] (P<0.05). Kaplan-Meier survival analysis revealed that the prognosis of the patients who had higher proportion of CD4 CD25high Tr cells in peripheral blood was worse (P=0.0026). In conclusion, the relative increase in CD4 CD25high Tr cells in peripheral blood may be related to im-munosuppression and tumor progression in patients with NSCLC. This finding suggests that CD4 CD25 high Tr cells in peripheral blood of NSCLC may be positive for prognosis analysis. The use of depletion of the CD4 CD25high Tr cell therapy to treat NSCLC patients may be an effective strategy.     

Changes of CD4＋ CD25＋ Regulatory T Cells in Peripheral Blood in Patients with Hepatocellular Carcinoma Before and after TACE

This study investigated the changes of CD4＋ CD25＋ regulatory T cells （Tregs） in periph-eral blood of patients with hepatocellular carcinoma before and after transcatheter arterial chemoem-bolization （TACE）. The proportion of CD4＋ CD25＋ Tregs among CD4＋ T lymphocytes in peripheral blood of 33 patients with hepatocellular carcinoma was determined by flow cytometry before, 1 week and 1 month after TACE. And 25 healthy volunteers served as control. One month after TACE, the patients were divided into two groups： 22 in group A, who were in stable condition or getting better; and 10 in group B, who were deteriorating. One patient died and was excluded. The results showed that the percentage of CD4＋CD25＋ Tregs among CD4＋ T lymphocytes did not significantly change in the 33 patients 1 week after TACE as compared with that before TACE, however, the difference was significant （P〈0.01） between the patients with hepatocellular carcinoma and the healthy subjects. The percentage of CD4＋ CD25＋ Tregs among CD4＋ T lymphocytes in group A 1 month after TACE was decreased significantly in comparison with that before and 1 week after TACE （P〈0.01）, whereas, that in group B was increased significantly 1 month after TACE （P〈0.01）. It was concluded that patients with hepatocellular carcinoma had a higher proportion of CD4＋CD25＋ Tregs in peripheral blood. TACE did not significantly affect the level of CD4＋ CD25＋ Tregs within short time （such as 1 week）. The proportion of CD4＋CD25＋ Tregs in peripheral blood 1 month after TACE was related to the prognosis of hepatocellular carcinoma.     

Effect of Tiotropium Bromide on Expression of CD_8~＋CD_（25）~＋FoxP_3~＋ Regulatory T Cells in Patients with Stable Chronic Obstructive Pulmonary Disease

The expression of CD8+CD25+FoxP3+ regulatory T cells(CD8+Tregs) in the peripheral blood of patients with stable chronic obstructive pulmonary disease(COPD),and the effect of muscarinic cholinergic receptor antagonist tiotropium bromide on the expression of CD8+Tregs were investigated.Twenty-three patients with moderate to severe stable COPD were enrolled in this study.All patients inhaled tiotropium bromide(18 μg daily) for 3 months.Before and after inhalation of tiotropium bromide,peripheral blood samples were collected from the patients,and T cells were labeled by three-color labeled monoclonal antibodies.Flow cytometry was used to detect the quantity and percentage of CD8+T cells,CD8+CD25+T cells,CD8+Tregs,CD4+T cells,CD4+CD25+T cells and CD4+CD25+FoxP3+ regulatory T cells(CD4+Tregs) respectively.The percentage of CD4+T cells was increased from(27.82±2.18)% to(35.53±1.3)%(t=3.20,P=0.004) in the peripheral blood of patients with stable COPD after inhalation of tiotropium bromide for 3 months,that of CD4+CD25+T cells was decreased from(10.03 ±1.42)% to(4.21 ±0.65)%(t=3.78,P=0.001),and that of CD8+Tregs was increased from(8.41 ±1.68)% to(21.34 ±4.20)%(t=2.72,P=0.013).At baseline,CD8+T cells,CD8+CD25+T cells and CD4+Tregs were detectable in the peripheral blood,but no significant changes were observed after treatment.Linear correlation analysis revealed that the difference before and after treatment in CD4+T cells and CD4+CD25+T cells was negatively correlated with the ratio of change in CD8+Tregs before and after treatment(r=-0.61,P=0.013;r=-0.72,P=0.001 respectively).In the peripheral blood of patients with stable COPD,there was the expression of CD8+Tregs and CD4+Tregs.Muscarinic receptor antagonist,tiotropium bromide,can promote the amplification of CD4+T cells,inhibit the expression of CD25+T cells,and enhance the expression of CD8+Tregs.CD8+Tregs and CD4+Tregs can be used as new indicators to understand the immune status of patients.They are helpful in judging the treatment efficacy and disease immunophenotype.     

Expression of surface markers on peripheral CD4＋CD25^high T cells in patients with atopic asthma： role of inhaled corticosteroid

Background CD4^＋CD25^＋ regulatory T cells （Tregs） mediate immune suppression through cell-cell contact with surface molecules, particularly cytotoxic T lymphocyte-associated antigen 4 （CTLA-4）, glucocorticoid-induced tumor necrosis factor receptor family-related protein （GITR）, and transforming growth factor β （TGF-β）, but little is known about the exact role of Tregs in the pathogenesis of asthma. This study sought to characterize the expression of surface markers on peripheral blood mononuclear cells-derived Tregs in patients with atopic asthma and healthy subjects, and to investigate the effect of inhaled corticosteroid on them.
Methods The expression of surface molecules on CD4^＋CD25^high Tregs was detected by flow cytometry. The effect of inhaled corticosteroid on expression of the surface molecules on Tregs was determined in vivo and in vitro. Total serum immunoglobulin E （IgE） and high-sensitivity C-reactive protein were measured by enzyme linked immunosorbent assay and latex enhanced immunoturbidimetric assay, respectively. Results Equivalent numbers of peripheral Tregs were found in patients with atopic asthma （stable and acute） and healthy subjects. Tregs preferentially expressed CTLA-4, GITR, toll-like receptor 4 （TLR4）, latency-associated peptide （LAP/FGF-β1）, and forkhead box P3 （FOXP3）. Patients with acute asthma had decreased numbers of CD4^＋CD25^highLAP^＋ T cells compared to healthy subjects and stable asthmatics. Inhaled corticosteroid enhanced the percentage of Tregs expressing LAP in vivo and in vitro dose-dependently. Furthermore, the percentages of Tregs expressing LAP were negatively correlated with total serum IgE levels and severity of asthma, but positively correlated with forced expiratory volume in one second percentage of the predicted value in patients with asthma.
Conclusions The results suggest that membrane-bound TGF-β1 is a potential candidate for predicting the severity of asthma, and may contribute to the sustained remission     

各类胸腹水中淋巴细胞亚群分布水平的研究

Objective To determine counts of T lymphocyte sub-populations in malignant and tuberculous pleural effusion or ascites and evaluate its significance in difierential diagnosis.Methods T lymphocyte sub-populations in pleural effusion or ascites and peripheral blood were determined in 30 patients with tuberculosis and 31 patients with cancer by flow cytometry.Concentrations of cytokines Th1 and Th2,γ-interferon(IFN-γ),interleukin-12(IL-12)and IL-4 in pleural effusion or ascites were measured by enzyme-linked immunosorbent assay(ELISA).Results Compared to that in peripheral blood,percentage of CD3+ and CD4+ T-celI counts were all higher in both malignant and tuberculous pleural effusion or ascites [(73±6)%and(67±20)%vs.(51±19)%and(48±14)%,P＜0.05].Although CD3+T-cells count was higher in tuberculous pleural effusions or ascites,no difference in ratio of CD3+ and CD4+/CD3+ and CD8+ T-cell counts was found between malignant and tuberculous pleural effusions or ascites.However,ratios of IFN-γ and IL-12 to IL-4 were higher in tuberculous pleural effusion or ascites(54±24 and 82±19vs.8±6 and 19±10,t=10.34 and 16.28,respectively,P＜0.01).Conclusions CD3+ and CD4+ Tcells can be aggregated in both malignant and tuberculous pleural effusions or ascites,80 nature (tuberculosis or malignancy)of pleural effusion or ascites can not be differentiated by CD4+ and/or CD8+ T-cell counts only,and determination of cytokines Th1 and Th2 can help their differentiation.     

各类胸腹水中淋巴细胞亚群分布水平的研究

Objective To determine counts of T lymphocyte sub-populations in malignant and tuberculous pleural effusion or ascites and evaluate its significance in difierential diagnosis.Methods T lymphocyte sub-populations in pleural effusion or ascites and peripheral blood were determined in 30 patients with tuberculosis and 31 patients with cancer by flow cytometry.Concentrations of cytokines Th1 and Th2,γ-interferon(IFN-γ),interleukin-12(IL-12)and IL-4 in pleural effusion or ascites were measured by enzyme-linked immunosorbent assay(ELISA).Results Compared to that in peripheral blood,percentage of CD3+ and CD4+ T-celI counts were all higher in both malignant and tuberculous pleural effusion or ascites [(73±6)%and(67±20)%vs.(51±19)%and(48±14)%,P＜0.05].Although CD3+T-cells count was higher in tuberculous pleural effusions or ascites,no difference in ratio of CD3+ and CD4+/CD3+ and CD8+ T-cell counts was found between malignant and tuberculous pleural effusions or ascites.However,ratios of IFN-γ and IL-12 to IL-4 were higher in tuberculous pleural effusion or ascites(54±24 and 82±19vs.8±6 and 19±10,t=10.34 and 16.28,respectively,P＜0.01).Conclusions CD3+ and CD4+ Tcells can be aggregated in both malignant and tuberculous pleural effusions or ascites,80 nature (tuberculosis or malignancy)of pleural effusion or ascites can not be differentiated by CD4+ and/or CD8+ T-cell counts only,and determination of cytokines Th1 and Th2 can help their differentiation.     

Changes of CD4＋ CD25＋ Regulatory T Cells in Peripheral Blood in Patients with Hepatocellular Carcinoma Before and after TACE

This study investigated the changes of CD4 CD25 regulatory T cells (Tregs) in periph-eral blood of patients with hepatocellular carcinoma before and after transcatheter arterial chemoem-bolization (TACE). The proportion of CD4 CD25 Tregs among CD4 T lymphocytes in peripheral blood of 33 patients with hepatocellular carcinoma was determined by flow cytometry before, 1 week and 1 month after TACE. And 25 healthy volunteers served as control. One month after TACE, the patients were divided into two groups: 22 in group A, who were in stable condition or getting better; and 10 in group B, who were deteriorating. One patient died and was excluded. The results showed that the percentage of CD4 CD25 Tregs among CD4 T lymphocytes did not significantly change in the 33 patients 1 week after TACE as compared with that before TACE, however, the difference was significant (P<0.01) between the patients with hepatocellular carcinoma and the healthy subjects. The percentage of CD4 CD25 Tregs among CD4 T lymphocytes in group A 1 month after TACE was decreased significantly in comparison with that before and 1 week after TACE (P<0.01), whereas, that in group B was increased significantly 1 month after TACE (P<0.01). It was concluded that patients with hepatocellular carcinoma had a higher proportion of CD4 CD25 Tregs in peripheral blood. TACE did not significantly affect the level of CD4 CD25 Tregs within short time (such as 1 week). The proportion of CD4 CD25 Tregs in peripheral blood 1 month after TACE was related to the prognosis of hepatocellular carcinoma.     

CD4＋CD25＋调节性 T 细胞及其相关因子在恶性肿瘤患者胸腔积液及外周血中的表达

目的:探讨CD4~+CD25~+调节性T细胞及其相关因子在恶性肿瘤患者胸腔积液及外周血中的表达。方法:选取42例恶性肿瘤胸腔积液患者为研究组,38例健康体检者为对照组,采用流式细胞仪(FCM)和酶联免疫法(ELISA)检测研究组胸腔积液和外周血、对照组外周血中CD4~+CD25~+/CD4~+比例、淋巴细胞亚群以及转化生长因子-β1(TGF-β1)、白细胞介素-10(IL-10)和干扰素-γ(IFN-γ)水平。结果:研究组胸腔积液及外周血中CD4~+CD25~+/CD4~+比例及TGF-β1、IL-10水平均显著高于对照组(P<0.01),且胸腔积液高于外周血(P<0.01),而IFN-γ水平显著低于对照组,且胸腔积液低于外周血(P<0.01)。结论:对恶性肿瘤患者外周血和胸腔积液中CD4~+ CD25~+调节性T细胞及TGF-β1、IL-10和IFN-γ水平进行检测有利于判断病情预后和转归。     

白癜风患者外周血CD4+CD25+Foxp3+调节性T细胞的检测及意义

目的检测白癜风患者外周血CD4+CD25+Foxp3+调节性T细胞水平变化及免疫调节剂对其表达的影响,进一步明确其在白癜风免疫治疗中的意义。方法白癜风患者36例,进展期24例,稳定期12例。采用流式细胞术检测不同病期白癜风患者外周血CD4+CD25+Foxp3+调节性T细胞水平,并与20例正常人进行对照。对进展期白癜风患者给予免疫调节剂等进行综合治疗。结果进展期患者外周血中CD4+CD25+Foxp3+调节性T细胞数量低于正常对照组(P<0.05);稳定期患者与正常对照组比较差异无统计学意义(P>0.05);经卡介菌多糖核酸治疗后,进展期患者CD4+CD25+Foxp3+调节性T细胞数量高于治疗前(P<0.05),略低于正常对照组(P>0.05),稳定期患者与治疗前比较差异无统计学意义(P>0.05)。结论白癜风患者外周血中CD4+CD25+Foxp3+调节性T细胞的数量存在异常,使体内免疫功能处于失衡状态,卡介菌多糖核酸可能通过调节CD4+CD25+Foxp3+调节性T细胞的表达水平,调节白癜风患者的细胞免疫功能,从而发挥治疗作用。     

调节性T细胞及Th17细胞在结核性胸膜炎中的表达及其意义

目的：探讨CD4^＋CD25^＋CD127^-调节性T细胞（Treg细胞）及辅助性T细胞17（Th17细胞）在结核性胸膜炎患者外周血及胸腔积液中的表达及其临床意义。方法：收集住院初治结核性胸膜炎患者30例,另选择健康体检人员20例为正常对照组。采用流式细胞仪检测患者和对照组外周血及患者胸腔积液中CD4^＋CD25^＋CD127^-Treg细胞及Th17细胞的表达。结果：结核性胸膜炎患者外周血组中单个核细胞（Peripheral blood mononuclear cells,PBMC）的CD4^＋T细胞值明显低于健康正常外周血组;结核性胸膜炎患者外周血中外周血PBMC的CD4^＋CD25^＋T细胞值较健康正常外周血组高;结核性胸膜炎患者外周血中CD4^＋CD25^＋CD127^-Treg细胞水平较健康对照组外周血高（P〈0．05）;结核性胸膜炎患者胸腔积液中CD4^＋CD25^＋CD127^-Treg细胞水平升高;患者胸腔积液中检测到Treg细胞,与患者外周血呈正相关;患者外周血中Th17细胞的表达低于对照组（P〈0．05）;患者胸腔积液中检测到Th17细胞。结核性胸膜炎患者在规则治疗后,结核性胸膜炎患者外周血组中PB—MC的CD4^＋T细胞值逐渐增加,而CD4^＋CD25^＋T细胞和CD4^＋CD25^＋CD127^-Treg细胞逐渐降低;患者外周血中的Th17细胞表达逐渐增加;胸腔积液中Th17细胞的含量逐渐降低。结论：CD4^＋CD25^＋CD127^-Treg细胞及Th17细胞可作为判断结核性胸膜炎患者免疫功能的指标,其通过调节机体免疫力参与结核性胸膜炎的发生、发展;CD4^＋CD25^＋CD127^-Treg细胞及Th17细胞可能在结核性胸膜炎的发病中发挥作用。它们对结核性胸膜炎患者的免疫状态、指导用药、疗效观察有一定的临床意义。     

慢性粒细胞白血病患者PBMCs中CD4+CD25+细胞体外增殖及对CD4+CD25-细胞增殖的影响

目的 探讨慢性粒细胞白血病(CML)患者外周血单个核细胞(PBMCs)来源的CD4 CD25 细胞体外增殖及对CD4 CD25-细胞增殖的影响.方法 以免疫磁性分离方法(MACS)分选出CML患者外周单个核细胞中的CD4 CD25 及CD4 CD25-细胞后,用流式细胞仪分析细胞的纯度及活力;再以小鼠抗人CD3单抗、小鼠抗人CD28单抗及rh IL-2作为刺激因子,CD4 CD25 细胞与CD4 CD25-细胞共培养,观察CD4 CD25 细胞对CD4 D25-细胞增殖的抑制效应.结果 (1)分选后健康对照组及CML患者PBMC中CD4 CD25 细胞纯度分别为(84.93±2.55)%、(86.32±2.40)%,两者相比,无显著差异(P＞0.05);(2)经MACS分选后正常对照组与CML患者CD4 CD25 细胞活力分别为(98.12±0.68)%、(97.33±0.78)%,两者相比,无显著差异(P＞0.05);(3)无论是健康对照还是CML患者的CD4 CD25 细胞均具有明显抑制效应性细胞如CD4 CD25-细胞的增殖,随着CD4 CD25 细胞数的增加,这种抑制增殖的能力也相应增加,当CD4 CD25 T:CD4 CD25-T为1:1时,抑制率最大.结论 MACS分选法能够分选出高纯度及高活力的CD4 CD25 细胞,分选后CD4 CD25 细胞在体外均能抑制CD4 CD25-细胞增殖,且这种抑制效应呈一定效靶比关系.     

外周血调节性T细胞在儿童与成人重症肌无力发病机制中的作用

目的 初步探讨外周血CD4+CD25+调节性T细胞在重症肌无力(MG)发病中的作用.方法 用流式细胞术分别检测儿童和成人MG外周血CD4+CD25+调节性T细胞的数最及其表达Foxp3和CTLA-4的情况.结果 儿童MG外周血CD4+CD25+调节性T细胞的数量明显高于正常儿童对照组,但其表达Foxp3水平反而大大低于对照组,成人MG比较差异无统计学意义.所有MG患者外周血CD4+CIY25+调节性T细胞表达的表面分子CTLA-4与正常对照比较,差异无统计学意义.结论 儿童MG患者外周血CD4+CD25+调节性T细胞存在着数量改变和功能缺失.提示儿童MG发病可能与外周血调节性T细胞免疫耐受功能受损有关.     

食道癌患者CD4^＋、CD25^＋、Foxp3^＋调节性T细胞的变化及意义

[目的]初步探讨CD4^＋CD25^＋Foxp3^＋调节性T细胞在食道癌患者外周血中的变化及临床意义。[方法]59例食道癌患者,分为鳞癌组47例,腺癌组12例,另外30例健康志愿者为对照组,用流式细胞术分别检测外周血中CD4^＋、CD25^＋、Foxp3^＋T细胞占CD4^＋T细胞的比例。[结果]食道癌初诊患者组CD4^＋、CD25^＋、Foxp3^＋T细胞比例为（10．33±5．72）％,明显高于健康志愿者组（4．56±1．06）％（P〈0．01）,而食道鳞癌组和食道腺癌组CD4^＋、CD25^＋、Foxp3^＋T细胞比例没有明显差异。[结论]CD4^＋、CD25^＋、Foxp3^＋调节性T细胞在食道癌初诊患者外周血中比例增加,可能是食道癌免疫抑制的一个重要原因。     

骨转移瘤患者89SrCl2治疗前后外周血CD4+ CD25+调节性T细胞及Foxp3mRNA的表达变化

目的 探讨骨转移瘤患者89SrCl2治疗前后外周血中CD4+ CD25+调节性T细胞及Foxp3 mRNA的表达变化.方法 采用流式细胞术检测57例骨转移瘤患者89SrCl2治疗前后外周血CD4+ CD25+调节性T细胞的水平,并与25例健康成人进行比较.同时采用RT-PCR方法检测患者89SrCl2治疗前后及对照组外...     

CD4~+CD25~+调节性T细胞在HBV宫内感染的表达及意义

目的:探讨CD4+CD25+调节性T细胞(CD4+CD25+Treg)在HBV宫内感染者血液中的表达及意义。方法:流式细胞技术检测157例乙肝大三阳但肝功能正常孕产妇外周血、其分娩新生儿脐血、HBV宫内感染婴幼儿外周血中CD4+CD25+Treg表达水平。结果:HBV宫内感染产妇外周血及新生儿脐血中CD4+CD25+Treg的百分数较未感染组高(P<0.05);HBV持续感染者CD4+CD25+Treg比例较感染转阴组高(P<0.05)。结论:CD4+CD25+Treg抑制体内HBV清除,宫内感染与其表达上调有关。     

脐血和成人外周血CD4^＋CD25^＋调节性T细胞的分离及功能特征的比较

目的分离成人外周血、脐血CD4^＋CD25^＋调节性T细胞,并检测其功能,以了解脐血CD4^＋CD25^＋T细胞的特性。方法应用免疫磁珠分选法从健康成人外周血、脐血淋巴细胞中分离纯化CD4^＋CD25^＋、CD4＋CD25-T细胞。应用流式细胞术检测分离纯度,胎盘蓝染色检测细胞存活率;RT-PCR技术检测CD4^＋CD25^＋、CD4＋CD25-T细胞中Foxp3的mRNA的表达;体外增殖实验检测其对CD4＋CD25-T细胞的免疫抑制作用。结果 MACS分离的CD4^＋CD25^＋T细胞、CD4＋CD25-T细胞纯度达（92.7±1.6）%、（90.3±1.2）%,细胞存活率达（95.3±2.1）%;体外经抗CD3、CD28单克隆抗体刺激培养的脐血及成人外周血CD4^＋CD25^＋T细胞同时得到扩增,而且高表达Foxp3;CD4^＋CD25^＋T细胞能有效的抑制效应T细胞的增殖,当效靶比为1︰1时,其抑制效应T细胞的作用最强,成人外周血抑制率为（81.36±1.61）%、脐血抑制率为（90.74±2.43）%。结论脐血和成人外周血CD4^＋CD25^＋T细胞是一群具有免疫抑制功能的调节性T细胞,与成人外周血相比,培养后的脐血CD4^＋CD25^＋T细胞比成人外周血有更强的免疫抑制功能。     

大鼠急性脑缺血后CD4~+CD25~+调节性T细胞、Foxp3表达及其意义

目的动态观察大鼠急性脑缺血后不同时期外周血中CD4+CD25+调节性T细胞和脑组织中Foxp3的表达,探讨其在急性缺血性卒中病理生理演变过程中的作用。方法 48只Wistar大鼠按随机数字表法分为缺血组和假手术组。参考改良的Zea-Longer插线方法将缺血组大鼠制作成右侧大脑中动脉线栓脑缺血动物模型。采用流式细胞术和免疫组化染色检测造模后1、3、7、14 d时大鼠外周血中CD4+CD25+调节性T细胞表达和脑组织中Foxp3表达,同时采用改良NSS神经功能评分观察大鼠行为学变化。结果缺血组和假手术组大鼠神经功能缺损评分在模型制备后逐渐下降(P<0.01)。流式细胞术显示脑缺血后1、3 d时缺血组大鼠外周血中CD4+CD25+调节性T细胞的表达与假手术组比较差异无统计学意义(P>0.05),7、14 d时表达明显高于假手术组(P<0.05),且与大鼠的神经功能评分呈负相关(r=-0.68,P=0.01)。免疫组化显示脑缺血后1 d时缺血组大鼠脑组织中即可观察到Foxp3表达,且主要集中在缺血灶区域,在未缺血侧也可观察到Foxp3表达,但表达量较少,而假手术组脑组织中未见Foxp3表达。结论 CD4+CD25+调节性T细胞参与了大鼠急性脑缺血后炎症免疫反应的发生发展过程,且在脑缺血后1 d时便开始参与脑缺血性损伤的免疫调节,这种免疫调节对脑细胞有着保护作用。