免疫性血小板减少症患者外周血CD4^(+)CD28-T细胞数量及功能分析

目的:研究免疫性血小板减少症(ITP)患者外周血CD4^(+)CD28-T细胞比例及功能,深入了解ITP的发病机制。方法:选取2021年1月至2022年6月于大连医科大学附属第二医院就诊的ITP患者30例及30例性别、年龄匹配的健康人作为对照,收集外周抗凝血提取单个核细胞(PBMC),流式细胞术分析PBMC中CD4^(+)CD28-T细胞比例及功能,ELISA检测ITP患者血浆中IL-18、IL-18BP含量,IL-18刺激PBMC,流式细胞术检测IL-18刺激前后CD4^(+)CD28-T细胞比例。结果:ITP患者外周血CD4^(+)CD28-T细胞比例明显高于健康对照组,且IFN-γ和TNF-α分泌能力更强;ITP患者血浆中IL-18含量上调;IL-18刺激可提高ITP患者PBMC中CD4^(+)CD28-T细胞比例。结论:ITP患者外周血中CD4^(+)CD28-T细胞比例升高,分泌炎症因子的能力更强。

CD4^(+)CD28^(−)T细胞的特点及其在疾病中的作用研究进展

在健康的年轻人体内,传统CD4^(+)T细胞的CD28表达高达97.5%,而研究发现在老年人、慢性炎症和持续感染的患者体内CD4^(+)T细胞的CD28阳性率显著下降,甚至不足50%,即出现CD4^(+)CD28^(−)T细胞积累。CD4^(+)CD28^(−)T细胞是一群独特的CD4^(+)T细胞亚群,本文综述了该亚群的表型特征、功能特点及其在慢性病毒感染、自身免疫病和心血管疾病中的作用,为CD4^(+)CD28^(−)T细胞相关疾病的治疗和预后改善提供了新策略。

初发过敏性紫癜患儿外周血CD_4^+CD_^(28)-和CD_8^+CD_(28)^-T细胞水平变化及意义

目的观察初发过敏性紫癜(HSP)患儿外周血T淋巴细胞亚群(CD4+CD2-8T细胞和CD8+CD2-8T细胞)的表达变化,并探讨其临床意义。方法采用流式细胞技术(FCM)检测89例初发HSP患儿(HSP组)和30例健康儿童(对照组)外周血T淋巴细胞免疫表型。结果 HSP组CD4+CD2+8、CD8+CD2+8、CD3+CD4+T淋巴细胞表达水平及CD4+/CD8+比率较对照组显著降低(P均<0.05);HSP组CD3+和CD3+CD8+T淋巴细胞表达水平与对照组相比无显著性差异(P>0.05);HSP组CD4+CD2-8T细胞和CD8+CD2-8T细胞较对照组明显增高(P均<0.05),但在皮肤型、关节型、腹型、混合型和紫癜性肾炎五种临床类型间无明显差别(P均>0.05)。结论 HSP患儿存在T淋巴细胞亚群的紊乱,CD4+CD2-8T细胞及CD8+CD2-8T细胞的异常增高可能参与了其发病过程,但与HSP临床类型无关。

急性冠脉综合征患者CD4^+CD28^-T淋巴细胞与HLA-DRB1的相关性

目的:探讨人HLA-DRB1等位基因多态性与急性冠脉综合征(ACS)CD4+CD28-T细胞数量的关系。方法:采用聚合酶链反应-序列特异性引物DNA分型技术对136例ACS患者和115例健康对照进行HLA-DRB1基因分型。同时采用流式细胞术(FCM)进行CD4+CD28-T细胞测定,分析HLA与CD4+CD28-T细胞的相关性。结果:HLA-DRB1*15,DRB1*04和DRB1*01等位基因与CD4+CD28-T淋巴细胞数量相关,表达DRB1*04和DRB1*01的患者有高百分比的CD4+CD28-T淋巴细胞,而表达DRB1*15的所有患者却有低数量的CD4+CD28-T淋巴细胞。结论:在黑龙江地区人群中,ACS患者CD4+CD28-T细胞的形成与HLA-DRB1*01、DRB1*04和DRB1*15密切相关。

脑卒中患者外周血CD4^+CD25^+及CD4^+CD28^-T细胞的变化及临床意义

目的:研究脑卒中患者外周血CD4^+CD25^+及CD4^+CD28^-T细胞的变化及其与神经元损害标志物、炎症细胞因子、斑块稳定性指标的相关性。方法:选择在我院诊断为急性缺血性脑卒中的患者作为研究的脑卒中组,另取同期体检的健康志愿者作为对照组。采集外周血并测定CD4^+CD25^+及CD4^+CD28^-T细胞的含量,采集血清并测定神经元损害标志物、炎症细胞因子、斑块稳定性指标的含量。结果:脑卒中组外周血中CD4^+CD25^+的含量以及血清中BDNF、IGF-1、IL-10、TGF-β1、TIMP2、Vaspin的含量低于对照组,外周血中CD4^+CD28^-T细胞的含量以及血清中NSE、VILIP-1、ET-1、IL-6、CX-CL12、VCAM-1、P-selectin、ox-LDL、CatS、ICTP、VEGF的含量的含量高于对照组;脑卒中组外周血中CD4^+CD25^+的含量与血清中BDNF、IGF-1、IL-10、TGF-β1、TIMP2、Vaspin的含量呈正相关,NSE、VILIP-1、ET-1、IL-6、CXCL12、VCAM-1、P-selectin、ox-LDL、CatS、ICTP、VEGF的含量呈负相关;外周血中CD4^+CD28^-T细胞的含量与血清中BDNF、IGF-1、IL-10、TGF-β1、TIMP2、Vaspin的含量呈负相关,NSE、VILIP-1、ET-1、IL-6、CXCL12、VCAM-1、P-selectin、ox-LDL、CatS、ICTP、VEGF的含量呈正相关。结论:脑卒中患者外周血CD4^+CD25^+及CD4^+CD28^-T细胞的变化能够加重神经元损害、促进炎症反应激活及斑块稳定性下降。

CD4^+CD28^-T淋巴细胞与ACS关系的研究进展

近年来,在急性冠脉综合征(ACS)患者的粥样斑块中和外周血中发现一种不寻常的T细胞,CD4+CD28-T淋巴细胞,IL-12使它CCR-5的表达增加,CCR-5与粥样硬化病变中MIP-1α/CCL3和RANTES/CCL5结合促进CD4+CD28-T淋巴细胞的聚集,这种细胞既表现效应性记忆细胞的特性,又具有中心记忆性T细胞的特性,表现在产生大量干扰素-γ,细胞溶解功能和在体内能杀死内皮细胞和血管平滑肌细胞(VSMCs)功能、克隆扩增性和长寿命性,促进动脉粥样硬化斑块不稳定性,与ACS的发病密切相关。其研究结果对ACS的预防和治疗提供新的途径。

外周血CD4^(+)CD25^(+)、CD8^(+)CD28^(+)调节性T细胞水平对早期宫颈癌患者腹腔镜根治术后预后的预测价值

目的分析外周血CD4^(+)CD25^(+)、CD8^(+)CD28^(+)调节性T细胞水平对早期宫颈癌(CC)患者腹腔镜根治术后预后的预测价值。方法招募2018年9月至2020年9月于儋州市人民医院接受腹腔镜根治术治疗的早期CC患者204例,根据患者术后随访期间预后情况分为预后不良组(43例)和预后良好组(161例)。比较两组临床资料。采用Spearman秩相关分析外周血CD4^(+)CD25^(+)调节性T细胞水平与CD8^(+)CD28^(+)调节性T细胞水平的相关性。采用多因素logistic回归分析早期CC患者腹腔镜根治术后预后不良的影响因素。采用受试者工作特征(ROC)曲线评估外周血CD4^(+)CD25^(+)、CD8^(+)CD28^(+)调节性T细胞水平对早期CC患者腹腔镜根治术后预后不良的预测价值。结果预后不良组CD4^(+)CD25^(+)调节性T细胞、癌胚抗原(CEA)、糖类抗原125(CA125)水平,术后切缘阳性占比以及术中宫旁浸润占比高于预后良好组,CD8^(+)CD28^(+)调节性T细胞水平低于预后良好组,差异有统计学意义(P<0.05)。Spearman秩相关分析结果显示,早期CC患者外周血CD4^(+)CD25^(+)调节性T细胞水平与CD8^(+)CD28^(+)调节性T细胞水平呈负相关(r_(s)=-0.478,P<0.05)。多因素logistic回归分析结果显示,较高的CEA、CA125、CD4^(+)CD25^(+)调节性T细胞水平是促进早期CC患者腹腔镜根治术后预后不良发生的独立危险因素(P<0.05),较高的CD8^(+)CD28^(+)调节性T细胞水平是抑制早期CC患者腹腔镜根治术后预后不良发生的独立保护因素(P<0.05)。ROC曲线分析结果显示,外周血CD4^(+)CD25^(+)、CD8^(+)CD28^(+)调节性T细胞水平能有效预测早期CC患者腹腔镜根治术后预后不良(P<0.05),两项指标联合可进一步提高预测效能[AUC(95%CI)=0.939(0.898~0.979),P<0.001],灵敏度和特异度分别为86.00%、88.20%。结论外周血CD4^(+)CD25^(+)、CD8^(+)CD28^(+)调节性T细胞水平与早期CC患者腹腔镜根治术后预后不良有关,二者能有效预测早期CC患者腹腔镜根治术后预后不良。

外周血CD4^(+)PD-1^(+)Tcells及CD4^(+)T淋巴细胞ATP含量与复发性卵巢癌疗效的相关性分析

目的 探讨外周血CD4^(+)程序性细胞死亡受体-1(PD-1)^(+)T cells及CD4^(+)T淋巴细胞三磷酸腺苷(ATP)含量与复发性卵巢癌疗效的相关性。方法 选取30例复发性卵巢癌患者为复发组,30例未复发卵巢癌患者为非复发组;另选取30名同期体检健康者作为对照组。评估外周血CD4^(+)PD-1^(+)T cells及CD4^(+)T淋巴细胞ATP含量与复发性卵巢癌疗效的相关性。结果 复发组和非复发组的CD4^(+)PD-1^(+)T cells较对照组明显升高(P<0.05)。复发组和非复发组的CD4^(+)T淋巴细胞ATP含量较对照组明显降低(P<0.05)。复发组治疗后CD4^(+)PD-1^(+)Tcells显著低于治疗前(P<0.05),治疗后CD4^(+)T淋巴细胞ATP含量显著高于治疗前(P<0.05)。CD4^(+)PD-1^(+)T cells与复发性卵巢癌疗效成负相关(r=-0.393,P=0.039),CD4^(+)T淋巴细胞ATP含量与复发性卵巢癌疗效成正相关(r=0.449,P=0.031)。结论 复发性卵巢癌患者外周血CD4^(+)PD-1^(+)T cells及CD4^(+)T淋巴细胞ATP含量与疗效密切相关。

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.

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.

Role of LAP^+CD4^+ T cells in the tumor microenvironment of colorectal cancer

AIM To investigate the abundance and potential functions of LAP^+CD4^+ T cells in colorectal cancer(CRC). METHODS Proportions of LAP^+CD4^+ T cells were examined in peripheral blood and tumor/paratumor tissues of CRC patients and healthy controls using flow cytometry. Expression of phenotypic markers such as forkhead box(Fox)p3, cytotoxic T-lymphocyte-associated protein(CTLA)-4, chemokine CC receptor (CCR)4 and CCR5 was measured using flow cytometry. LAP^-CD4^+ and LAP^+CD4^+ T cells were isolated using a magnetic cellsorting system and cell purity was analyzed by flow cytometry. Real-time quantitative polymerase chain reaction was used to measure expression of cytokines interleukin (IL)-10 and transforming growth factor(TGF)-β.RESULTS The proportion of LAP^+CD4^+ T cells was significantly higher in peripheral blood from patients (9.44% ± 3.18%) than healthy controls (1.49% ± 1.00%, P < 0.001). Among patients, the proportion of LAP^+CD4^+ T cells was significantly higher in tumor tissues(11.76% ± 3.74%) compared with paratumor tissues (3.87% ± 1.64%, P < 0.001). We also observed positive correlations between the proportion of LAP^+CD4^+ T cells and TNM stage(P < 0.001), distant metastasis(P < 0.001) and serum level of carcinoembryonic antigen(P < 0.05). Magnetic-activated cell sorting gave an overall enrichment of LAP^+CD4^+ T cells (95.02% ± 2.87%), which was similar for LAP^-CD4^+ T cells(94.75% ± 2.76%). In contrast to LAP^-CD4^+ T cells, LAP^+CD4^+ T cells showed lower Foxp3 expression but significantly higher levels of CTLA-4, CCR4 and CCR5(P < 0.01). LAP^+CD4^+ T cells expressed significantly larger amounts of IL-10 and TGF-β but lower levels of IL-2, IL-4, IL-17 and interferon-γ, compared with LAPCD4+ T cells.CONCLUSION LAP^+CD4^+ T cells accumulated in the tumor microenvironment of CRC patients and were involved in immune evasion mediated by IL-10 and TGF-β.

骨髓间充质干细胞通过上调CD8^+CD28^-T细胞抑制T细胞的增殖

本研究旨在探讨CD8+ CD2 8- T细胞在间充质干细胞 (MSC)抑制T细胞增殖中的作用。应用尼龙毛柱分离T淋巴细胞 ,再经CD8磁珠分选出CD8+ T淋巴细胞 ;用植物血凝素 (PHA)刺激与或未与MSC共培养 3天的CD8+ T细胞 ,应用MTT法测定T细胞的增殖 ;应用流式细胞术分别检测与或未与MSC共培养 8天的CD8+ T细胞亚群的变化及用PHA刺激与或未与MSC共培养 3天的CD8+ T细胞亚群的变化。结果表明 ,MSC抑制PHA刺激引起的CD8+ T细胞的增殖 ,且这种抑制作用是剂量依赖性的 ;流式细胞术结果显示 ,与未经MSC处理的CD8+ T细胞相比 ,MSC显著上调共培养 8天的CD8+ T细胞中的CD8+ CD2 8- 亚群 ,及经PHA作用 72小时后的CD8+ T细胞中的CD8+ CD2 8- 亚群。结论 :MSC通过上调CD8+ CD2 8- T细胞发挥抑制作用。

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.

GD患者外周血CD4^+CD28-T细胞亚群的表型特征及临床意义

检测Graves病(GD)患者外周血CD4^+CD28-T细胞水平及其表面CD45RO/CD45RA及ICOS的表达,探讨CD4^+ CD28-T细胞亚群在GD免疫致病机制中的作用。采用三色荧光抗体染色及流式细胞术检测了42例初发GD患者和30例健康者外周血中CD4^+CD28-T细胞的百分率及其表面CD45RO/CD45RA和ICOS表达水平,同时检测其甲状腺功能并进行相关性分析。结果GD患者外周血中CD4^+CD28-T细胞百分率明显高于健康对照组,并高表达ICOS分子,与FT3水平显著正相关;与健康对照组相比,GD患者CD4^+CD28^-CD45RO^+T细胞百分率也显著增高,而CD4^+CD28^-CD45RA^+T细胞呈下降趋势,FT3、FT4水平与CD4^+CD28-T细胞表面CD45RO的表达率呈正相关,而FT3水平与CD45RA表达呈负相关。结论GD患者外周血CD4^+CD28^-T细胞异常增高,表面高表达ICOS分子,具有记忆性细胞的表型特征,与甲状腺功能异常有一定的相关性,CD4^+CD28-T细胞可能是参与GD免疫病理反应的自身反应性T细胞。

外周CD4^+CD25^+T细胞降调节及CD28^+T细胞升调节参与人类自然流产

目的:探讨CD4+CD25+调节性T细胞及CD28、CTLA-4协同刺激分子在人孕早期母胎免疫耐受中的作用机制。方法:以15例黄体期育龄妇女外周血为对照,应用流式细胞术对15例早孕期正常妊娠者、15例早孕期自然流产患者外周血淋巴细胞中CD4+CD25+T细胞亚群及CD28、CTLA-4分子的表达进行分析。结果:早孕期正常妊娠者外周CD4+CD25+T细胞比例显著高于早孕期自然流产患者及黄体期育龄妇女(P<0.05);早孕期自然流产患者外周CD28分子的表达水平显著高于早孕期正常妊娠者及黄体期育龄妇女(P<0.05);各组淋巴细胞基本不表达表面CTLA-4(CTLA-4s)分子,而均表达细胞内CTLA-4(CTLA-4i)分子,各组间CTLA-4i分子表达水平比较无显著性差异。结论:人早孕期外周CD4+CD25+调节性T细胞比例下降及CD28分子表达水平上升可能与早期妊娠失败有关。

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.

带状疱疹患者外周血CD_4^+T细胞表面CD_(28)的表达

目的研究带状疱疹患者外周血CD3+T、CD4+T及CD4+T细胞表面CD28的表达,探讨CD4+T细胞活化功能状态在带状疱疹发病中的意义。方法利用流式细胞仪检测35例带状疱疹患者外周血CD3+T、CD4+T及CD4+T细胞表面CD28的表达,以20例正常人作为对照,并分别与患者的临床特征进行比较。结果状疱疹患者外周血CD3+T细胞、CD4+T细胞及CD4+CD2+8T细胞的比率较正常对照组显著降低;不同年龄组和不同病程组患者外周血CD4+T细胞和CD4+CD2+8T细胞的比率差异有统计学意义;但不同病情组的表达差异无统计学意义。结论状疱疹患者外周血CD4+T细胞表面的CD28表达下调,通过影响CD4+T细胞活化,可能参与带状疱疹的发生。