急性ITP患儿外周血调节性T细胞及相关细胞因子的研究

目的检测急性特发性血小板减少性紫癜(AITP)患儿外周血CD4+CD25+调节性T细胞(regulationTcells,Tr细胞)及相关细胞因子的变化,探讨它们在AITP发病机制中的作用。方法流式细胞仪分别检测AITP患儿和正常健康儿童外周血Tr细胞的数量,ELISA法检测血清中相关细胞因子的含量,并进行相关性分析。结果AITP患儿外周血Tr细胞的数量明显低于正常对照组[(2.83±1.05)%vs(5.07±0.59)%,P<0.05];AITP患儿血清中IL-10、转化生长因子β1(TGF-β1)的含量均也低于正常对照组[IL-10:(29.48±13.69)pg/mlvs(43.10±14.95)pg/ml;TGF-β1(170.04±91.58)pg/mlvs(254.75±130.41)pg/ml,P<0.05],差异有显著性。AITP患儿外周血Tr细胞的比例与血清中IL-10、TGF-β1的含量都呈正相关(r1=0.54,r2=-0.66,P<0.05)。结论急性ITP患儿外周血中Tr细胞数量的减少及相关细胞因子含量的降低可能与急性ITP的细胞免疫失调有关。     

T Cell Activation and T Cell Receptor Variable Region Gene Usage in Measles

T cell activation and T cell receptor variable (V) regions were studied with monoclonal antibodies in peripheral blood lymphocytes from 22 patients with measles. Increased (> 5%) activated T cells (HLA-DR⁺ CD3⁺ cells) were noted in 14 of the 22 patients. Elevations of Vβ5⁺ and Vβ8 + T cells were observed in two and four patients, respectively, and appeared to be associated with T cell activation. The duration of fever was significantly prolonged in those with increased (> 10%) activated T cells (p < 0.01). These results suggest that T cell activation and the preferential expansion of Vβ8⁺ and Vβ5⁺ T cells are associated with the pathogenic process of measles.     

Regulation of CD31 expression and interleukin-4 production by human cord blood CD4+ T cells with interleukin-4 and interleukin-7

BACKGROUND: T helper 2 cell type cytokines, such as interleukin (IL)-4 and IL-5, play pivotal roles in the development of allergic diseases. However, the mechanism by which naive CD4+ T cells acquire the ability to produce these cytokines remains unclear. Recently, it was reported that IL-7 induces the ability to produce IL-4 as well as interferon (IFN)-gamma and IL-5 in naive CD4+ T cells without TCR stimulation. To further analyze the mechanism of acquiring IL-4-producing ability by naive CD4+ T cells, the effects of IL-7 on human cord blood CD4+ T cells were compared with those of IL-4, which induced the ability to produce IFN-gamma but not IL-4. RESULTS: Interleukin-7 preserved the population of CD4+CD31- T cells in cord blood and induced their IL-4-producing ability without T cell receptor (TCR) stimulation, while IL-4 induced CD31 on CD31- T cells and could not induce their IL-4-producing ability. Both the CD31-inducing effect and the inhibitory priming effect for IL-4-production by IL-4 were also observed after cord blood CD4+ T cells had been primed with IL-7 and acquired the IL-4-producing ability. CONCLUSIONS: Interleukin-7 induced the IL-4-producing ability in naive CD4+CD31- T cells without TCR stimulation, suggesting that the signal transduction via CD31 may have an inhibitory effect on the acquisition of the IL-4-producing ability by cord blood CD4+ T cells in the absence of TCR stimulation.     

CD25+CD4+ regulatory T cells in patients with Kawasaki disease

OBJECTIVE: To investigate whether the CD25 + CD4 + regulatory T-cell population, which plays important roles not only in maintaining immunologic self-tolerance but also in controlling the magnitude and character of antimicrobial immune responses, is related to the pathophysiology of Kawasaki disease (KD). STUDY DESIGN: The patient group consisted of 54 patients (median age, 30 months; 27 female and 27 male patients) fulfilling the criteria for KD. Age-matched control subjects included 17 patients with active infections and 24 healthy children. We analyzed CD25 + CD4 + cells and the mRNA expression of Foxp3, cytotoxic T lymphocyte-associated antigen 4 (CTLA4), glucocorticoid-induced tumor necrosis factor receptor (GITR), and transforming growth factor beta in peripheral blood mononuclear cells and purified CD4 + T cells. RESULTS: The proportions of CD25 + CD4 + cells in patients with acute-phase KD (median, 2.35% of total lymphocytes) were significantly lower than those in healthy control subjects (median, 3.14%) and control subjects with disease (median, 3.15%). The proportions returned to the normal level after intravenous gammaglobulin treatment (median, 3.86%). The mRNA expression of Foxp3, CTLA4, and GITR showed similar tendencies. CONCLUSIONS: The decrease of CD25 + CD4 + regulatory T cells in the acute phase might have a role in the development of KD.     

白细胞介素6/STAT3信号活化在急性免疫性血小板减少性紫癜患儿辅助性T淋巴细胞17/调节性T淋巴细胞失衡中的作用

目的探讨IL-6/STAT3信号活化在儿童急性免疫性血小板减少性紫癜(ITP)辅助性T淋巴细胞17(Th17)/调节性T淋巴细胞(Treg)失衡中的作用。方法选择急性ITP患儿30例,同年龄健康对照组30例。ELISA法检测其血浆IL-6水平;荧光定量PCR检测CD4+T淋巴细胞RORγt mRNA、FOXP3 mRNA、细胞因子信号转导抑制因子(SOCS)1 mRNA、SOCS3 mRNA表达;流式细胞术检测其外周血CD4+CD25+FOXP3+T淋巴细胞、CD4+IL-17A+T淋巴细胞比例及CD4+T淋巴细胞磷酸化STAT3(pSTAT3)蛋白平均荧光强度(MFI);甲基化特异性定量PCR检测CD4+T淋巴细胞SOCS1基因外显子2、SOCS3基因5’端非翻译区(5’-UTR)3个可能的STAT3结合位点CpG岛甲基化水平。结果 1.与健康对照组比较,ITP组患儿CD4+IL-17A+T淋巴细胞比例及RORγt mRNA表达水平显著上调(Pa<0.05),CD4+CD25+FOXP3+T淋巴细胞比例及FOXP3 mRNA表达显著降低(Pa<0.05),Th17/Treg比值明显升高(P<0.05);2.与健康对照组比较,ITP组患儿IL-6表达水平显著上调(P<0.05),且pSTAT3 MFI值亦明显增高(P<0.05);3.与健康对照组比较,ITP组患儿CD4+T淋巴细胞SOCS1和SOCS3 mRNA水平显著增加(Pa<0.05),与其Th17/Treg比值均呈负相关(r=-0.63、-0.70,Pa<0.05);健康对照组SOCS1基因外显子2、SOCS3基因5’-UTR区第3个STAT3结合位点的CpG岛完全去甲基化,急性ITP患儿呈低甲基化状态(Pa<0.05),其去甲基化水平与表达呈正相关(r=0.76、0.65,Pa<0.05)。各组SOCS3基因5’-UTR区第1、2个STAT3结合位点CpG岛均处于完全去甲基化状态(Pa>0.05)。结论 SOCS1和SOCS3基因低甲基化所致IL-6/STAT3信号异常活化可能是急性ITP患者Th17/Treg细胞失衡的因素之一。     

特发性血小板减少性紫癜儿童外周血调节性T细胞的变化

目的：研究特发性血小板减少性紫癜(ITP)患儿外周血CD4+CD25+CD127-及CD3+CD4-CD8-调节性T细胞（Treg）的变化及意义。方法：采用免疫荧光流式细胞技术检测33例ITP患儿及21例正常儿童外周血CD4+CD25+CD127-及CD3+CD4-CD8- Treg水平。结果：ITP患儿CD4+CD25+CD127-及CD3+CD4-CD8- Treg百分比明显低于正常儿童,分别为(2.7±1.7)％ vs (4.8±1.6)％;(5.2±3.1)％vs (8.1±3.5)％(P<0.01)。结论：ITP患儿CD4+CD25+CD127-及CD3+CD4-CD8- Treg百分率降低,提示其可能参与了ITP的发病机制。     

CD4+CD25+调节性T细胞在免疫性血小板减少性紫癜发病机制中的作用

免疫性血小板减少性紫癜是一种以血小板破坏增加和(或)血小板生成异常为特点自身免疫性疾病,以皮肤、黏膜或内脏出血为主要表现.该病发病机制复杂,目前尚未明确.CD4+ CD25+调节性T细胞为抑制细胞,是具有独特免疫调节功能的成熟CD4+T细胞亚群,在小鼠和健康人体中约占外周血CD4+T细胞的5％ ～10％,占人体外周血单个核细胞的1％ ～2％,其通过多种途径对免疫反应发挥抑制效应,能维持内环境的稳定.CD4+ CD25+调节性T细胞功能紊乱或数目异常是导致自身免疫性疾病的重要因素之一,在免疫性血小板减少性紫癜的发生、发展中发挥重要的作用.该文对CD4+ CD25+调节性T细胞的特征和作用及其在免疫性血小板减少性紫癜发病中的作用的研究进展作一综述.     

CTLA-4 expression in T cells of patients with atopic dermatitis

Cytotoxic T lymphocyte-associated antigen-4 (CTLA-4; CD152) is a surface molecule of activated T cells with sequence homologous to CD28, and may act as a negative regulator of T-cell activation. In murine animal models, cross-linkage of CTLA-4 molecules on the cell surface results in decreased T-cell proliferation, accompanied by increased interleukin (IL)-2 production and apoptosis. To clarify the activation of peripheral blood T cells, we studied the CTLA-4 expression in 32 patients with atopic dermatitis who visited our institution, and 19 normal children who visited for pre-operative laboratory examination were used as normal controls. Whole blood was obtained from all subjects and stained with anti-CD3, anti-CD4, anti-CD8 monoclonal antibodies (mAb). After erythrocyte lysis with lysing solution, the cells were stained with anti-CTLA-4 mAb, and stained cells were analysed by fluorescence-activated cell sorter (FACScan) flow cytometer. Intracellular expression of CTLA-4 was significantly upregulated in peripheral blood CD3+ T cells (36.8%), CD4+ T cells (21.7%) and CD8+ T cells (18.7%) of patients with atopic dermatitis, compared with normal control (18.3%, 9.7%, 9.8%; respectively). Furthermore, CTLA-4-positive CD3+ T cells in patients with severe atopic dermatitis were significantly higher compared with milder group (42.8% vs. 32.2%). However, no significant difference was obtained in CD4+ and CD8+ T cells. Mean percentage of T cells expressing CTLA-4 in patients with atopic dermatitis was higher than the control group. These observations suggest the possibility that the disease activity can be correlated with the CTLA-4 level.     

CD4+CD25int/highCD127low 调节性T细胞在再生障碍性贫血患儿中的检测及意义

目的：探讨再生障碍性贫血（AA）患儿外周血 CD4+ CD25int/high CD127low 调节性 T 细胞（Treg）的表达特点及其与 Hb、WBC 和 血小板（Plt）数量的相关性。方法：采用流式细胞术检测 15 例正常儿童（对照组）和 22 例治疗有效的AA患儿治疗前后外周血 CD4+ CD25int/high CD127low Treg百分比的变化,分析 CD4+CD25high-CD127low Treg与 Hb、WBC 和 Plt 数量的相关性。结果：AA 组急性期外周血 CD4+CD25+、CD4+CD25high、CD4+CD25+CD127low、CD4+CD25highCD127low Treg占 CD4+ T 细胞的百分比均较对照组显著降低（P﹤0.05）;恢复期的表达则高于急性期（P﹤0.05）,而与对照组比较差异无统计学意义（P﹥0.05）。AA组急性期、恢复期及对照组的 CD4+CD25highCD127low Treg表达率与外周血中 Hb、WBC 和 Plt 数量均呈正相关（r分别为 0.499、0.526、0.540,P<0.05）。结论：CD4+CD25int/highCD127low Treg 减低可能与 AA 发病有关,为其作为判断 AA 病情变化的指标提供了可能的理论依据,并可以作为免疫治疗的靶点之一进行深入研究。     

慢性扁桃腺炎患儿T淋巴细胞表型及功能分析

目的　探讨慢性扁桃腺炎患儿T淋巴细胞表型和功能障碍情况,为分析其病因和发病机制提供临 床和理论依据。方法　采用免疫荧光标记和流式细胞仪技术检测了27例慢性扁桃腺炎患儿和21例健康儿童外 周血T细胞亚群、B细胞及NK细胞的表面标记和T细胞活化后表面分子(CD3+/HLA DR+T和CD3+/CD25+)的 表达;同时采用ELISA方法检测了患儿和对照组血清中Th1型细胞因子IL 2和IFN γ的水平。结果　与对照组比 较,慢性扁桃腺炎患儿CD4+T细胞和CD3+/HLA DR+T活化细胞的阳性率显著降低(28.6%±4.4%vs25.4% ±4.5%,P<0.05;5.7%±1.9%vs3.9%±1.6%,P<0.01),CD4+/CD8+比值降低(1.17±0.30vs0.92± 0.18,P<0.01);但患儿CD3+T细胞、CD8+T细胞和CD3+/CD25+阳性的T细胞与对照组比较差异均无显著意 义。患儿CD19+B细胞阳性率、与Th1细胞功能有关的IL 2和IFN γ表达水平也较对照组显著降低(P<0.05或 P<0.05);而两组CD3 /CD(16+56)+NK细胞的阳性率无显著差异。结论　慢性扁桃腺炎患儿存在CD4+T细 胞减少,T细胞活化障碍,Th1细胞功能异常及B细胞减少,这可能是患儿反复感染和病程迁延的主要原因之一。     

Both allergen-specific CD4 and CD8 Type 2 T cells decreased in asthmatic children with immunotherapy

Allergen-specific immunotherapy (IT) has been used for the treatment of atopic diseases since the turn of this century. The precise working mechanisms, however, remain to be clarified. The aim of this study was to investigate the role of particular subsets of allergen-specific T cells in the non-atopic individuals, untreated asthmatic children and the asthmatic children receiving immunotherapy. We collected peripheral blood from 16 untreated asthmatic children and 17 asthmatic children receiving immunotherapy over one and half years. All the patients were sensitive to mite allergen. Peripheral blood mononuclear cells (PBMC) were isolated and, in vitro , stimulated with crude mite extract to enrich the mite-specific T-cell population. After 14 days, the enriched mite-specific T cells were stimulated with phorbol-12-myristate-13-acetate (PMA) and ionomycin for intracellular detection of cytokines such as IFN-γ, IL-4 in CD4⁺ and CD8⁺ T lymphocytes. The data here demonstrated that the levels of mite-specific IgG4 and IgA increased significantly in asthmatic children after immunotherapy. In addition, both IL-4 expressing CD4⁺ and CD8⁺ T cells were significantly lower in asthmatic children after immunotherapy compared with those of before treatment and the normal control (p < 0.05). In contrast, the frequency of IFN-γ expressing CD4⁺ and CD8⁺ T cells did not significantly differ between untreated and SIT-treated groups. All these data suggested that decreased Type 2 CD4⁺ and CD8⁺ T cells might be closely correlated with the regulatory mechanisms of immunotherapy.     

CD8+ T cell-mediated suppression of human immunodeficiency virus replication in older children with acquired immunodeficiency syndrome

BACKGROUND: Suppression of HIV replication by CD8+ T cells and/or their products correlated with the survival of infants. We sought to elucidate the role of CD8+ T cell-mediated suppression in seven older children with AIDS. METHODS: After separation of each child's CD4+ and CD8+ T cells, three different HIV culture assays were performed: (1) patient CD4+ T cells and phytohemagglutinin (PHA)-stimulated donor peripheral blood mononuclear cells (PBMC); (2) patient CD8+ T cells added to the CD4+ T cells and the PHA-stimulated donor PBMC (to test for CD8-mediated T cell suppression of HIV); (3) patient CD8+ cells added across a semipermeable membrane to the CD4+ T cells and the PHA-stimulated donor PBMC [to determine whether the CD8 cells secreted a soluble factor(s) that suppressed HIV]. RESULTS: Cultures from four of seven children showed greater HIV replication with CD4 cells alone than with CD4 and CD8 cells together, demonstrating CD8 suppression; evidence of soluble suppression was also seen. Cultures from two of the seven children showed HIV replication and no evidence of CD8 cell suppression. Cultures from one of the seven children had no appreciable replication of HIV even after removal of CD8 cells. CONCLUSIONS: CD8-mediated suppression is present in at least some children with AIDS. Additional mechanisms may be operating to slow the progression of the disease.     

CD8＋ T细胞在肠道病毒71型感染重症手足口病中的作用研究

目的：检测分析肠道病毒71型（EV71）感染手足口病患儿外周血CD8＋T细胞数量变化与患儿年龄以及病情严重程度之间的关系,进而分析探讨CD8＋T细胞在EV71感染神经系统并发症发生中的潜在作用。方法收集2014年3月至9月昆明市儿童医院感染科确诊的手足口病患儿138例,其中普通型33例,重型45例,危重型60例。患儿年龄9个月~5岁。采用流式细胞术对外周血中CD8＋T细胞亚群进行检测。结果与各年龄段健康儿童CD8＋T细胞参考值相比,除~2岁年龄段普通型手足口病患儿CD8＋T细胞百分比增高明显,~5岁年龄段危重型手足口病患儿CD8＋T细胞减低外,其他各年龄段各病情患儿中CD8＋T细胞均增高或略高。其中,9~15个月普通型、重型患儿外周血CD8＋T细胞百分比增高均较明显,而危重型患儿略增高;~2岁患儿随病情加重CD8＋T细胞增高幅度逐渐减低;~5岁年龄段患儿,普通型增高不明显,重型略高,危重型减低。~2岁年龄段普通型与重型、危重型手足口病患儿CD8＋T细胞百分比均存在显著差异（ P均﹤0.05）;而其他年龄段手足口病患儿,不同病情严重程度者CD8＋T细胞的表达无显著差异（ P均﹥0.05）。结论 CD8＋T细胞的表达变化与患儿年龄及病情严重程度间存在一定的关系;尤其是~2岁年龄段手足口病患儿体内CD8＋T细胞的表达减低与患儿病情发展至重症相关,推测CD8＋T细胞在~2岁年龄段手足口病患儿很可能发挥重要的抗病毒免疫反应。     

急性B淋巴细胞性白血病患儿外周血T淋巴细胞克隆谱系分析

目的　观察儿童急性B淋巴细胞性白血病化疗前后T淋巴细胞克隆谱系的异常。方法　逆转录 聚合酶链反应 (RT PCR)及高压变性聚丙烯酰胺凝胶电泳法检测 8例正常对照组小儿及 12例急性B淋巴细胞性白血病患儿化疗前外周血T细胞受体 (TCR) β链可变区 (BV)第三互补决定区(CDR3)的克隆谱系 ,4例患儿化疗后重新取材。结果　 (1) 12例患儿化疗前BV2和BV3表达较正常对照组增高 (P均 <0 0 5 ) ,BV17和BV18表达降低 (P均 <0 0 5 )。 4例患儿治疗前BV2 1家族低表达 ,缓解后表达进一步降低 (P <0 0 5 )。 (2 )正常对照组TCRBV多数家族CDR3谱型为正态分布 ,12例患儿TCRBVCDR3谱型异常发生率为 14 % ,高于正常对照组的 5 5 % (P <0 0 5 ) ,发生谱型异常较多的家族依次是BV14、BV1、BV16、BV2 0、BV13 1、BV13 2和BV6。 4例患儿第 1次化疗缓解后 3个月谱型异常的家族均恢复正态分布。结论　急性B淋巴细胞性白血病患儿部分T细胞克隆发生异常增生或缺失 ,提示白血病患儿细胞免疫功能异常 ,化疗初次缓解后 3个月T细胞克隆谱系基本恢复正常的正态分布 ,已基本完成T细胞克隆谱系的重建     

������������ѪTh17ϸ�� CD4+CD25+������ϸ���仯�����벡����ط���?

目的探讨支气管哮喘患儿外周血中辅助T细胞(Th)17细胞和CD4+CD25+调节性T细胞(Treg)的变化与儿童哮喘病情的相关性。方法收集2009年月5月至2010年4月于郑州大学第一附属医院就诊的患儿,均为首次确诊哮喘或规范吸入激素停用>3个月后复发及近1个月内无明显感染者。采用流式细胞仪测定患儿外周血中Th17细胞及CD4+CD25+Treg比例的变化。结果 Th17细胞在哮喘急性期组(2.24%±1.02%)较哮喘缓解期组(1.65%±0.38%)及健康儿童组(1.02%±0.28%)均显著增高(P<0.05),哮喘缓解期组(1.65%±0.38%)和健康儿童组(1.02%±0.28%)无明显差别,CD4+CD25+Treg细胞比例在3组儿童间差异均有统计学意义(F=45.604,P<0.05),与健康儿童组(7.11%±0.89%)相比,哮喘缓解期组(6.05%±0.87%)和哮喘急性期组(5.37%±0.80%)的比例明显下降,而哮喘急性期组较健康儿童组下降。哮喘急性期组轻、中、重度3组之间差异同样有统计学意义。Th17细胞与哮喘患儿病情呈正相关(r=0.649,P<0.05),而CD4+CD25+...     

儿童重症化脓性脑膜炎CD3＋ CD8＋ T细胞与炎症指标、体液免疫的变化

目的：通过观察儿童重症化脓性脑膜炎早期血CD3＋CD8＋T细胞的变化,以及与炎症指标、体液免疫指标之间的关系,探讨其在儿童重症化脓性脑膜炎发生发展中的临床意义。方法回顾性分析中国医科大学附属盛京医院PICU 2014年8月1日至2015年12月31日收治的39例1个月~14岁的重症化脓性脑膜炎患儿,血CD3＋CD8＋T细胞计数正常或升高(≥190个/mm3)为A组( n＝22),降低(<190个/mm3)为B组(n＝17),分析患儿的一般资料、血液炎症指标、体液免疫、脑脊液改变在两组患儿中的分布和差异。结果17例(43.6％)患儿CD3＋CD8＋T细胞明显下降;所有4例死亡均为B组患儿;虽然没有统计学差异,但 B 组 Glasgow 昏迷评分<8分者比例(58.8％)高于 A 组(31.8％)。B组C-反应蛋白、降钙素原中位数(最小值-最大值)分别为251.0(26.2-417.0)mg/L、32.7(0.9-100.0)ng/L,远远高于A组的106.5(12.0-458.0)mg/L、4.5(0.1-200.0)ng/L,差异有统计学意义(P<0.05);B组中6例(35.3％)外周血WBC<4×109/L,而 A组为1例(4.6％),中性粒细胞>80％的比例A组为7例(31.8％),而B组为12例(70.6％),两组比较差异有统计学意义(P<0.05)。 B组14例(82.3％)患儿脑脊液中糖含量<2.0 mmol/L,高于A组[11例(50.0％)],两组比较差异有统计学意义(P<0.05)。结论儿童重症化脓性脑膜炎CD3＋CD8＋T细胞可能受到抑制,其与患儿脑功能损伤程度、炎症反应以及预后相关。可能对指导临床免疫制剂的应用有一定帮助。     

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目的 观察原发性肾病综合征(PNS)患儿泼尼松治疗前后CD4+CD25+调节性T细胞(CD4+CD25+Tr)的变化,阐明肾上腺糖皮质激素治疗儿童PNS的免疫机制.方法 选择2004-2007年在深圳市儿童医院住院治疗的初发PNS患)L42例,其中激素敏感型32例,激素耐药型10例.同期25例健康体检儿童作为对照组.流式细胞术检测泼尼松治疗前后外周血CD3+CD4+CD8-、CD3+CD4-CD8+、CD4+CD25+Tr的比例,荧光定量聚合酶链反应(Real-time PCR)检测泼尼松治疗前后外周血单个核细胞(PBMC)叉头型基因P3(Foxp3)、细胞毒性T淋巴细胞相关抗原4(CTL-4)和糖皮质激素诱导的肿瘤坏死因子受体(GITR)基因mRNA的表达.结果 与对照组比较,PNS患儿外周血CD3+CD4+CD8-T细胞、CD3+CD4-CD8+T细胞、CD4+CD25+Tr比例无明显改变(P>0.05).激素敏感型PNS患儿CD4+CD25+Tr比例在泼尼松治疗后明显增高,差异有统计学意义(P<0.01);激素耐药型PNS患儿CD4+CD25+Tr比例在泼尼松治疗前后无明显改变(P>0.05).激素敏感型PNS患儿在泼尼松治疗后PBMC细胞Foxp3、CTLA-4和GITR基因mRNA的表达明显增高;而激素耐药型PNS患儿泼尼松治疗前后Foxp3、CTLA-4基因表达无明显改变,仅GITR表达明显增高.结论 泼尼松等肾上腺糖皮质激素类药物可通过上调激素敏感型PNS患儿CD4+CD25+调节性T细胞的表达发挥免疫治疗作用.     

静注免疫球蛋白及地塞米松对特发性血小板减少性紫癜患儿免疫功能的影响

探讨大剂量地塞米松 (DEX)及静注免疫球蛋白 (IVIG)治疗 ,对特发性血小板减少性紫癜 (ITP)患儿外周血 T淋巴细胞亚群及免疫球蛋白的影响 ,在以DEX、IVIG治疗 ITP患儿 ,治疗前后各抽血一次 ;以 APAAP法测定 T淋巴细胞亚群 ,以单向琼脂免疫扩散法测定免疫球蛋白。结果表明 1.ITP患儿外周血 CD4+ 降低 ,CD8+增高 CD4+ /CD8+ ,显著降低。单纯 DEX组治疗后 ,CD4+、CD8+均显著降低 ,CD4+ /CD8+升高 ,Ig A、Ig G、Ig M降低 ;单纯 IVIG组治疗后 ,CD8+显著降低 ,CD4+ /CD8+升高 ,Ig G显著升高。2 .单纯 DEX组治疗后 ITP患儿外周血白细胞计数显著高于治疗前 ,单纯 IVIG组与 IVIG加 DEX组治疗前后无显著差异。治疗过程中院内交叉感染率单纯 DEX组为 31.43% ,单纯 IVIG治疗组为 2 5 % ,IVIG加 DEX组为2 8.5 7%。因此 ,本文认为 ITP患儿外周血 T淋巴细胞亚群表达异常 ,IVIG及 DEX治疗均干扰了 ITP患儿机体的免疫状态