CD69+CD4+CD25-T在自身免疫性胰腺炎患者外周血中表达升高及临床意义

目的检测CD69+CD4+CD25-T细胞在自身免疫性胰腺炎(AIP)患者外周血中的表达情况,进一步分析其临床意义。方法收集2014年9月~2016年12月长海医院血液科诊断的32例AIP患者与同期体检的32例健康个体外周血分别作为实验组与对照组。采用密度梯度离心法分离外周血单个核细胞(PBMCs),用流式细胞术检测PBMCs中的CD69+CD4+CD25-T,以ELISA法检测血浆中细胞因子的表达状况。两组间变量的比较采用两独立样本<检验,两计量资料间的关系以Pearson相关系数表示。结果实验组与对照组CD69+CD4+CD25-T表达水平为10.36%±3.68%vs3.99%±1.45%,(t=9.110,P<0.000 1);TGF-β的表达水平为399.86±121.88vs 143.87±56.22 pg/ml,(t=10.79,P<0.000 1),差异均具有统计学意义。实验组CD69+CD4+CD25-T细胞与TGF-β呈正相关(r=0.653,P<0.001),与IL-4,IFN-γ,IL-2呈负相关(r=-0.442,-0.567,-0.351,P<0.05),差异具有统计学意义。结论 CD69+CD4+CD25-T细胞可能参与了AIP的免疫病理过程,是临床诊断与治疗潜在的生物学指标。

The changes and clinical significance of CD4+CD25+ and CD4+CD28-T cells in peripheral blood of patients with stroke

Objective:To study the changes of CD4+CD25+ and CD4+CD28-T cells in peripheral blood of patients with stroke and their correlation with neuronal damage markers, inflammatory cytokines and plaque stability indicators.Methods: The patients who were diagnosed with acute ischemic stroke in our hospital between June 2014 and December 2017 were selected as the stroke group of the research, and healthy volunteers who received physical examination during the same period were selected as the control group. Peripheral blood was collected to determine the contents of CD4+CD25+ and CD4+CD28-T cells, and serum was collected to determine the contents of neuron damage markers, inflammatory cytokines and plaque stability indicators.Results: Peripheral blood CD4+CD25+ cell content as well as serum BDNF, IGF-1, IL-10, TGF-β1, TIMP2 and Vaspin contents of stroke group was lower than those of control group whereas peripheral blood CD4+CD28-T cell content as well as serum NSE, VILIP-1, ET-1, IL-6, CXCL12, VCAM-1, P-selectin, ox-LDL, CatS, ICTP and VEGF contents was higher than those of control group;peripheral blood CD4+CD25+ cell content of stroke group was positively correlated with serum BDNF, IGF-1, IL-10, TGF-β1, TIMP2 and Vaspin contents, and negatively correlated with NSE, VILIP-1, ET-1, IL-6, CXCL12, VCAM-1, P-selectin, ox-LDL, CatS, ICTP and VEGF contents;peripheral blood CD4+CD28-T cell content was negatively correlated with serum BDNF, IGF-1, IL-10, TGF-β1, TIMP2 and Vaspin contents, and positively correlated with NSE, VILIP-1, ET-1, IL-6, CXCL12, VCAM-1, P-selectin, ox-LDL, CatS, ICTP and VEGF contents.Conclusion: The changes of CD4+CD25+ and CD4+CD28-T cells in peripheral blood of patients with stroke can aggravate the neuron damage and promote the inflammatory response activation and plaque stability decline.

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.

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.

CD4^(+)CD25^(+)Foxp3^(+)Treg及CD19^(+)CD69^(+)B细胞在狼疮性肾炎患者外周血中的水平变化及其与疾病活动度的关系

目的研究CD4^(+)CD25^(+)Foxp3^(+)Treg、CD19^(+)CD69^(+)B细胞在狼疮性肾炎中的水平变化与及其与病活动度的关系。方法选取我院于2018年10月至2020年10月收治的108例狼疮性肾炎患者作为研究组,根据系统性红斑狼疮的疾病活动指数(SLEDAI)分为轻度活动度组(38例)、中度活动度组(44例)、重度活动度组(26例),另选取同期于我院行肾穿刺活检证实为微小病变患者为对照组(50例)。检测受试者外周血中CD4^(+)CD25^(+)Foxp3^(+)Treg、CD19^(+)CD69^(+)B细胞水平,分析各组间细胞水平差异,采用ROC曲线分析CD4^(+)CD25^(+)Foxp3^(+)Treg、CD19^(+)CD69^(+)B细胞诊断狼疮性肾炎的价值,采用Pearson相关性分析各细胞与疾病活动度间的相关性。结果研究组患者外周血CD19^(+)CD69^(+)B细胞、TNF-α、CA199水平均显著高于对照组(P<0.05),而CD4^(+)CD25^(+)Foxp3^(+)Treg明显低于对照组(P<0.05)。不同严重程度狼疮性肾炎患者外周血CD4^(+)CD25^(+)Foxp3^(+)Treg、CD19^(+)CD69^(+)B细胞、TNF-α、CA199水平差异有统计学意义(P<0.05),其中重度组患者外周血CD19^(+)CD69^(+)B细胞、TNF-α、CA199水平最高。Pearson相关性分析显示,CD4^(+)CD25^(+)Foxp3^(+)Treg、CD19^(+)CD69^(+)B细胞分别与SLEDAI评分呈现负、正相关性,相关系数r分别为-0.458、0.468。采用ROC曲线分析显示,CD19^(+)CD69^(+)B细胞、CD4^(+)CD25^(+)Foxp3^(+)Treg诊断狼疮性肾炎的曲线下面积分别为0.801(95%CI=0.722~0.880)、0.839(95%CI=0.775~0.903)。两者联合诊断的曲线下面积为0.885(95%CI=0.826~0.944),高于单独检测(P<0.05)。结论CD4^(+)CD25^(+)Foxp3^(+)Treg、CD19^(+)CD69^(+)B细胞在狼疮性肾炎患者外周血中处于异常水平状态,且水平与疾病活动度相关,两者联合检测可作为诊断狼疮性肾炎的新指标。

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.

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.

Isolation and identification of CD4^+CD25^+ regulatory T cells in rat

Objective： To establish a stable and high efficient method for collection of CD4^＋CD25^＋ regulatory T cells from rats in vitro. Methods： CD4^＋CD25^＋ regulatory T cells were isolated from the rat splenic cells through two steps by magic cell sorting （MACS） system. The first step was negative selection of CD4^＋T cells by cocktail antibodies and anti-IgG magic microbeads, and the second step was positive selection of CD25^＋T cells by anti-CD25 PE and anti-PE magic microbeads. The purity and viability of separated cells were measured by flow cytometry （FACS） and Trypan blue staining. The suppressive ability of seperated cells on the proliferation of CD4^＋CD25^- T cells was assessed by cell proliferation assay. Results： The purity of negatively enriched CD4^＋ T cells was 79%-87% （83.6%±2.5% ） , and the purity of positively enriched CD4^＋CD25^＋ T cells was 86%- 93% （ 90.2±1.8% ） with the viability of 92%～95% （92.8% ± 3.4% ）. The enriched cells significantly suppressed the proliferation of CD4^＋CD25^- T cells in mixed lymphocyte culture （P 〈 0.05）. Conclusion： An effective method can be established for enrichment of CD4^＋CD25^＋ regulatory T cells in two steps by MACS, with satisfied cell purity, viability and function.

CD4^+CD25^+、CD4^+CD69^+和CD4^+HLA-DR^+T淋巴细胞的昼夜节律性变化

目的:探讨CD4+CD25+、CD4+CD69+和CD4+HLA-DR+T淋巴细胞的昼夜节律性变化情况。方法:10名健康男性志愿者,年龄24～30岁,平均25岁。预先在昼夜节律模式条件(16h-light:8h-dark cycle,LD)下生活1周:室温25±1oC,起床时间:7:00,睡眠时间(无光照期):23:00～7:00,早餐时间:7:30～8:00,午餐时间:11:30～12:00,晚餐时间:5:00～6:00;睡眠时光照强度<0.1 Lux;受试者自由饮水,无烟酒嗜好,日常活动和饮食成分基本一致。随后在一昼夜内每隔4h抽取各受试者外周血3ml,用流式细胞仪测定CD4+CD25+、CD4+CD69+和CD4+HLA-DR+T淋巴细胞占CD4+T细胞的百分比,通过余弦法和Clock Lab软件获取节律参数,并经振幅检验分析是否存在昼夜节律。结果:在自然光制下,CD4+CD25+、CD4+CD69+和CD4+HLA-DR+T淋巴细胞的相对数量均呈现昼高夜低的节律性振荡(P<0.05),但各细胞相对数量变化的峰谷时点略有不同。结论:人外周血CD4+CD25+、CD4+CD69+和CD4+HLA-DR+T淋巴细胞的变化均存在着昼夜节律性特征。

Immunotherapy of rat glioma without accumulation of CD4^+CD25^+FOXP3^+ regulatory T cells

Immunotherapy may be used for the treatment of glioblastoma multiforme; however, the induced immune response is inadequate when either T cells or dendritic cells are used alone. In this study we established a novel vaccine procedure in rats, using dendritic cells pulsed with C6 tumor cell lysates in combination with adoptive transfer of T lymphocytes from syngenic donors. On day 21 after tumor inoculation, all the rats were sacrificed, the brains were harvested for calculation of glioma volume, cytolytic T lymphocyte responses were measured by cytotoxic assay, and the frequency of regulatory T lymphocytes （CD4＋CD25~FOXP3~） in the peripheral blood was investigated by flow cytometric analysis. The survival rate of rats bearing C6 glioma was observed. Results showed that the co-immunization strategy had significant anti-tumor potential against the pre-established C6 glioma, and induced a strong cytolytic T lymphocyte response in rats. The frequency of peripheral blood CD4＊CD25＊FOXP3＊ regulatory T lymphocytes was significantly decreased following the combination therapy, and the rats survived for a longer period. Experimental findings indicate that the combined immunotherapy of glioma cell lysate-pulsed dendritic cell vaccination following adoptive transfer of T cells can effectively inhibit the growth of gliomas in rats, boost anti-tumor immunity and produce a sustained immune response while avoiding the accumulation of CD4＋CD25＋FOXP3＋ regulatory r lymphocytes.

Effect of CD4^+CD25^+ regulatory T cells in the development of anterior chamber-associated immune deviation

AIM: To investigate whether CD4(+)CD25(+) regulatory T (Treg) cells play a role in the development of anterior chamber-associated immune deviation (ACAID). METHODS: The dynamic changes in the frequency of CD4(+)D25(+) T cells, CD4(+)D25(+) FoxP3(+) T cells and CD4(+)CD25(+) PD-1(+) T cells from spleens of mice with ACAID were analyzed by flow cytometry. Foxp3 mRNA expression in purified CD4(+)CD25(+) T cells was analyzed using real-time PCR. The suppressive effect of purified CD4(+)CD25(+) T cells on the proliferation of CD4(+)CD25(-) T cells was evaluated by [H-3] thymidine incorporation. A blocking experiment was performed to further address the role of CD4(+)CD25(+) T cells in ACAID. The expression of IL-10 in purified CD4(+)CD25(+) T cells was evaluated by ELISA. RESULTS: Increased frequencies of CD4(+)CD25(+) T cells, CD4(+)CD25(+) Foxp3(+) T cells and CD4(+)CD25(+) PD-1(+) T cells were observed in ACAID. The CD4(+)CD25(+) T cells from mice with ACAID showed enhanced suppressive effect on the proliferation of CD4(+)CD25(-) T cells. Treatment of BALB/c mice with anti-CD25 antibody after injection of OVA into the anterior chamber significantly inhibited the induction of ACAID. Furthermore, purified CD4(+)CD25(+) T cells from ACAID mice secreted IL-10. CONCLUSION: Our results demonstrate that Treg cells are induced in the mice undergoing ACAID. These Treg cells may play a role in the development of ACAID.

人Foxp3基因真核载体的构建及在CD4^+CD25^-T细胞中的表达和功能

目的:构建人Foxp3基因的真核表达载体并转染人CD4+CD25-T细胞,观察其在CD4+CD25-T细胞中的表达及功能。方法:构建人Foxp3基因pEGFP-N1真核表达载体,经酶切及双向测序鉴定基因序列的正确性。通过电穿孔法将重组载体转入人CD4+CD25-T细胞中,利用荧光显微镜及流式细胞术检测转染效率,采用3H-TdR掺入法检测转染细胞对单个核细胞增殖能力的影响。结果:酶切及测序鉴定pEGFP-N1-Foxp3重组质粒基因序列完全正确,转染的CD4+CD25-T细胞Foxp3阳性表达率为23.7%,并显著抑制了单个核细胞的增殖能力。结论:成功构建了pEGFP-N1-Foxp3真核表达载体,并使转染的CD4+CD25-T细胞具有调节性T细胞的功能。

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

The proportion and changes of CD4^＋CD25^high 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^＋CD25^high Tr cells. The results showed that the proportion of CD4^＋CD25^high 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 （2.264±0.6） %; stage Ⅲ（3.284± 1.38） %; stage IV （6.06 4±4.08） %] （P〈0.05）. Kaplan-Meier survival analysis revealed that the prognosis of the patients who had higher proportion of CD4^＋CD25^high Tr cells in peripheral blood was worse （P=0.0026）. In conclusion, the relative increase in CD4^＋CD25^high 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^＋CD25^high Tr cell therapy to treat NSCLC patients may be an effective strategy.

Rapamycin increased development of CD4^+ CD25~h ighFoxp3^+ T cells of peripheral blood in liver transplant recipients

Objective To investigate the possible influence of immunosuppressive therapy,including sirolimus ( SRL) and calcineurin inhibitors ( CNI,tacrolimus) ,on level of Treg in liver allo - graft recipients. Methods Forty - seven liver transplant recipients with stable liver function were assessed for at least 2 years,and divided into

Effects of estrogen on CD4^+ CD25^+ regulatory T cell in peripheral blood during pregnancy

Objective To investigate the effects of estrogen(E_2)level on regulatory T cells(Treg)in peripheral blood during pregnancy.Methods:A total of 30 healthy non-pregnant women were selected as control group,90 pregnant women of early,middle and late pregnancy and 30 postpartum women at 1 month after parturition were selected as experimental groups including early pregnancy group,middle pregnancy group and late pregnancy group;the proportions of CD4^+CD25^+Treg and CD4^+CD25^+CD127^-Treg among CD4 T cells were detected by flow cytometry;the serum estrogen content in peripheral blood was detected by electrochemical immune luminescence method.Results:E_2 level was coincident with the change of Tregs number during pregnancy.The estrogen content in peripheral blood increased gradually from early pregnancy to late pregnancy,then decreased significantly after parturition,and the level at 1 month after parturition down to the level in non-pregnancy group(P>0.05);the level of E_2 in pregnancy groups were significantly higher than those in non-pregnancy group(P<0.01);and there were significant differences among early pregnancy group,middle pregnancy group and late pregnancy group(P<0.05).The proportions of CD4^+CD25^+Treg and CD4^+CD25^+CD127^-Treg in pregnancy groups were significantly higher than those in non-pregnancy group(P<0.05),but decreased significantly after parturition,and there was no significant difference between non-pregnancy group and postpartum women group(P>0.05):the proportions in middle and late pregnancy groups were significantly higher than those in early pregnancy group(P<0.05).but decreased slightly in late pregnancy group,there was no significant difference between late pregnancy group and middle pregnancy group(P>0.05).There was correlation between Tregs number with estrogen level during pregnancy.The proportion of CD4^+CD25^+Treg and CD4^+CD25^+CD 127^-Treg were positively correlated with estrogen level.Conclusions:High proportion of CD4^+CD25^+Trcg and CD4^+CD25^+CD127^-Treg is closely related to the high level of E,during pregnancy.It suggested that high level of estrogen may induce an increase of CD4^+CD25^+Treg in peripheral blood.and then influence the immune function of pregnant women.The results of this experiment might play an important role of estrogen in immune-modulation during pregnancy.

大鼠CD4~＋CD25-T细胞的Foxp3基因转染及其表达

背景:调节性T细胞在维持机体免疫应答稳态和免疫耐受方面具有非常重要的作用,但外周血中CD4+CD25+调节性T细胞含量极低,且增殖能力较差。目的:以携带Foxp3基因的慢病毒EGFP+载体转染大鼠CD4+CD25-T细胞,观察其在大鼠CD4+CD25-T细胞中的表达。方法:以免疫磁珠两步法分选大鼠CD4+CD25-T细胞,用携带大鼠Foxp3基因的慢病毒载体体外转染分选的细胞,以转染Foxp3基因的CD4+CD25-T细胞为实验组,EGFP空白质粒组及CD4+CD25-T细胞为阴性对照组,CD4+CD25+T细胞为阳性对照组。荧光显微镜和RT-PCR分别从蛋白和mRNA水平检测Foxp3基因的表达。结果与结论:成功完成了免疫磁珠的分选,获得了纯度较高的CD4+CD25-T细胞和CD4+CD25+T细胞,细胞存活率为(94±2)%,慢病毒转染的CD4+CD25-T细胞高表达Foxp3基因。表明以携带Foxp3基因的慢病毒载体系统可有效介导Foxp3基因在大鼠CD4+CD25-T细胞中高表达。

2型糖尿病及大血管病变患者CD4^+CD28^-T细胞、CD4^+CD25^+T细胞亚群的变化及意义

目的:观察外周血CD4+CD28-T细胞、CD4+CD25+T细胞亚群在2型糖尿病患者及大血管病变患者的变化,探讨其在2型糖尿病及大血管病变发病中的作用。方法:应用免疫荧光标记技术和流式细胞仪,检测36例初诊2型糖尿病(单纯DM组)患者和28例糖尿病并大血管病变患者、20例健康对照者的外周血T细胞亚群变化。结果:DM并大血管病变组、单纯DM组CD4+CD28-T细胞明显高于健康对照组,差异均有统计学意义(P<0.05);而CD4+CD25+T细胞明显低于健康对照组(P<0.05);DM并大血管病变组CD4+CD28-T细胞高于单纯DM组(P<0.05),CD4+CD25+T细胞低于单纯DM组。结论:机体细胞免疫异常在2型糖尿病及大血管病变的发生、发展中发挥着一定的作用。