50例肝癌患者外周血淋巴细胞亚群比例与肝功能损伤的关系

目的探讨肝癌患者外周血CD3~+T淋巴细胞、CD4~+T淋巴细胞、CD8~+T淋巴细胞、NK细胞亚群与肝功能损伤的关系。方法回顾性分析上海交通大学医学院附属仁济医院50例肝癌住院患者(原发性肝癌10例,继发性肝癌30例,合并其他肝脏疾病10例)外周血淋巴细胞亚群比例。以10例合并其他肝脏疾病患者作为疾病对照组,40名健康体检者作为健康对照组,结合患者的肝功能指标进行差异性和相关性分析。结果原发性肝癌患者淋巴细胞亚群比例与合并其他肝病组及健康对照组比较差异均无统计学意义。继发性肝癌患者CD4~+T淋巴细胞比例显著低于健康对照组[(29.18±2.11)%比(35.68±0.56)%,P0.05],NK细胞比例显著高于健康对照组[(21.45±1.69)%比(15.78±0.72)%,P0.01],其淋巴细胞亚群比例与合并其他肝病组比较差异均无统计学意义。原发性肝癌患者肝细胞损伤者CD4~+T淋巴细胞比例显著高于未损伤者[(45.90±5.96)%比(30.93±1.76)%,P0.05],CD4~+T淋巴细胞比例与ALT、AST均呈高度正相关(r=0.941、r=0.903,均P0.01),肝脏代谢功能受损者CD8~+T细胞比例显著低于正常者[(27.00±4.63)%比(34.01±7.98)%,P0.05],CD8~+T细胞比例与STB、PT均呈显著负相关(r=-0.596、r=-0.577,均P0.05)。继发性肝癌患者肝细胞损伤者CD4~+T细胞比例显著低于未损伤者[(23.22±3.28)%比(33.24±2.29)%,P0.05],CD8~+T细胞比例显著高于未损伤者[(34.70±4.26)%比(25.84±1.99)%,P0.05],CD4~+/CD8~+比值与ALT、AST均呈显著负相关(r=-0.470、r=-0.424,均P0.05),肝脏代谢功能受损者CD4~+T细胞比例显著高于正常者[(35.64±2.84)%比(25.56±2.57)%,P0.05],CD4~+/CD8~+比值与STB、PT均呈显著正相关(r=0.400、r=0.481,均P0.05)。结论肝癌患者外周血淋巴细胞亚群比例与肝功能损伤密切相关,机体免疫平衡状态的维持对于保护肝癌患者肝脏功能具有重要意义。     

CD178在肾综合征出血热患者外周血T细胞亚群表达的研究

为研究 CD1 78在肾综合征出血热 (HFRS)患者外周血 T细胞亚群的表达及意义 ,应用荧光抗体标记和流式细胞仪技术分析 CD1 78(Fas配体 )在 HFRS患者及健康人群 (对照组 )外周血 CD 4、CD 8T细胞表达的水平。结果 HFRS患者发热期组和多尿期组外周血 CD 4T淋巴细胞比例与正常对照组比较差异无显著性 ;而 CD 8T细胞明显增加 (P<0 .0 1) ;CD 4/CD 8比值明显下降 (P<0 .0 5 ) ;CD 4、CD1 78 T淋巴细胞和 CD 8、CD1 78 T淋巴细胞皆显著增高 (P<0 .0 5及 P<0 .0 0 1)。HFRS患者发热组和多尿组 CD 8T细胞的 CD1 78的表达率分别为 2 2 .18%和2 9.92 % ,而 CD 4T细胞的 CD1 78表达率分别为 4 .80 %和 5 .2 5 %。认为 HFRS的发病过程中 CD1 78主要表达于CD 8T淋巴细胞亚群 ,且发病早期和末期均有高表达     

腹腔镜胆囊切除术后患者外周血T细胞比例及功能变化

目的探讨胆结石采用腹腔镜胆囊切除术(LC)进行治疗对患者全身免疫功能的影响。方法选取50例胆结石患者,随机分为LC组和开腹腹腔镜胆囊切除术(OC)组各25例。分别于手术前和手术后24 h收集患者外周血,采用密度梯度离心法分离获取外周血单个核细胞(PBMC)。采用流式细胞术检测PBMC中CD4 T淋巴细胞比例、CD8 T淋巴细胞比例,并计算CD4 T/CD8 T淋巴细胞比例比值。采用胞内染色方法分析外周血干扰素(IFN)-γ~+CD4 T细胞比例和穿孔素阳性CD8 T细胞比例。结果与手术前外周血CD4 T细胞比例相比,手术后24 h LC组患者外周血CD4 T细胞比例未出现显著变化(P0.05);而OC组患者术后24 h外周血CD4 T细胞比例与术前相比显著降低(P0.05)。两组患者术后24 h外周血CD8 T细胞比例与术前相比均未出现显著变化(P0.05)。LC组患者外周血CD4/CD8 T细胞比例比值未出现显著变化;OC组患者外周血CD4/CD8 T细胞比例比值显著降低(P0.05)。与手术前外周血IFN-γ~+CD4 T细胞比例相比,手术后24 h LC组患者外周血IFN-γ~+CD4 T细胞比例和穿孔素阳性CD8 T细胞比例均未出现显著变化(P0.05);而OC组患者术后24 h外周血IFN-γ~+CD4 T细胞比例较术前显著降低(P0.05),术后24 h外周血穿孔素阳性CD8 T细胞比例较术前显著升高(P0.05)。结论 LC治疗对患者全身免疫功能的影响要轻于OC,可在临床广泛推广使用。     

重症肌无力患者手术切除胸腺疗效相关机制探讨

目的:探讨重症肌无力(MG)患者手术切除胸腺的疗效及其相关机制。方法:MG患者120例,均行手术切除胸腺治疗,对胸腺基质淋巴细胞生成素(TSLP)的表达与外周血中调节性T细胞的变化进行检测。结果:120例患者术后第7天总有效率为91.7%,术后第7天患者的外周血CD4+CD25+Foxp3+/CD4+值明显高于术前(P0.05)。胸腺组织HE染色可见的髓质部淋巴细胞增生与部分Hassall小体;免疫组化染色可见中髓质部Hassall小体数量明显减少,染色稍浅。相关性分析显示TSLP阳性表达的Hassall小体计数与CD4+CD25+Foxp3+Treg细胞表达水平之间呈线性相关(P0.05)。Logistic回归模型分析表明CD4+CD25+Foxp3+/CD4+值和TSLP阳性表达是影响疗效的独立危险因素(P0.05)。结论:切除胸腺对治疗MG疗效好,与有效调节T细胞与胸腺基质淋巴细胞生成素的表达有关。     

大鼠卡氏肺孢子虫肺炎的免疫应答

[目的 ]探讨应用糖皮质激素 (GC)诱发大鼠卡氏肺孢子虫肺炎 (Pneumocystiscariniipneumonia ,PCP)的免疫应答。 [方法 ]SD大鼠皮下注射GC建立免疫抑制PCP模型 ,测定外周血淋巴细胞比例、CD4+ T细胞 /CD8+ T细胞比例 ,肺泡灌洗液 (bronchoalveolarlavagefluid ,BALF)中淋巴细胞比例、sIL 2R和TNF α值。 [结果 ]①免疫抑制后外周血淋巴细胞比例、CD4+ T细胞 /CD8+ T细胞比例降低 ,BALF中淋巴细胞比例、TNF α、sIL 2R均降低 ;②BALF中TNF α、外周血CD4+ T细胞 /CD8+ T细胞比值在PCP组中最低 ;③PCP组的BALF中淋巴细胞比例比PC阴性对照组明显升高。 [结论 ]使用GC造成大鼠免疫抑制 ,诱发PC感染后 ,CD4+ 减少及TNF α分泌降低。     

重症肌无力伴发甲状腺异常的临床分析

目的 分析重症肌无力(MG)合并甲状腺异常患者的临床特点.方法 回顾性分析2008年7月-2009年9月同期住院的300例MG患者临床资料,比较260例甲状腺正常及40例伴甲状腺异常的MG患者临床特点,血清甲状腺抗体与乙酰胆碱受体抗体水平的相关性及外周血T淋巴细胞亚群百分比情况.结果 (1)合并甲状腺异常的MG占13.3%,MG伴甲状腺异常以出现甲状腺抗体阳性为多见(30例,占10.0%);(2)甲状腺正常与异常的MG患者在发病性别构成、年龄分布、病程、临床分型及胸腺病理上差异均无统计学意义;(3)伴有甲状腺抗体阳性MG患者血突触后膜乙酰胆碱受体水平(1.15±0.11)显著高于甲状腺抗体阴性者(1.01±0.11);(4)甲状腺异常组CD8+T淋巴细胞百分比(21.63±5.17)%明显低于甲状腺正常组(24.28±5.79)%,P＜0.05,CD4+/CD8+比值甲状腺异常组明显高于正常组(2.10±0.67比1.81±0.61,P＜0.05).结论 MG合并甲状腺异常以甲状腺抗体阳性多见,伴有甲状腺抗体阳性MG患者血突触后膜乙酰胆碱受体水平显著升高;MG合并甲状腺异常者其外周血T淋巴细胞亚群紊乱更为明显.     

HBV相关原发性肝癌患者外周血T、NK、B细胞及胸腺功能特征

目的:观察乙型肝炎相关原发性肝癌患者(hepatitis B virus-related primary liver cancer,H B V-P L C)发生和进展过程中外周血T、N K、B细胞数量的变化,并初步探讨T淋巴细胞减少与胸腺功能的联系.方法:收集在首都医科大学附属北京地坛医院住院的73例HBV-PLC患者,50例乙型肝炎肝硬化患者(liver cirrhosis,LC),37例慢性乙型肝炎(chronic hepatitis B,CHB)患者.收集3组患者一般资料和临床生化指标.采用流式方法检测3组患者外周血中CD3~+T淋巴细胞、CD4~+T、CD8~+T、CD3-CD16~+CD56~+NK、CD3-CD19~+B的分布情况,并检测了T淋巴细胞表面CD31、CD45RA分子的表达水平.结果:与CHB和LC患者相比,HBV-PLC患者外周血中性粒细胞升高,淋巴细胞减少(P0.001);与CHB患者相比,HBV-PLC患者外周血NK细胞计数减少(P=0.011),T淋巴细胞、CD4~+T、C D8~+T、B细胞计数减少,纯真CD4~+和CD8~+T细胞表面CD31表达降低(P0.001).在肝癌Child、Okuda、BCLC分期中晚期比早期淋巴细胞计数、T、CD4~+T、CD8~+T计数均降低(P0.05).结论:随着肝癌的发生和进展,HBV-PLC患者外周血抗肿瘤免疫细胞减少,这种减少与胸腺迁出功能降低有关.     

重症肌无力患者外周血CD4+T细胞功能的变化及相关机制

目的探讨重症肌无力(MG)患者外周血CD4~+T细胞功能的变化对其机制。方法抽取初治及治疗病情稳定的MG患者及同期入院进行健康体检者各20例的静脉血10 ml。流式细胞术(FCM)测定其外周血白细胞介素(IL)-17~+CD4~+T细胞、干扰素(IFN)-γ~+CD4~+T细胞、肿瘤坏死因子(TNF)-α~+CD4~+T细胞、IL-2~+CD4~+T细胞和CD4~+CD25high CD127~-Treg细胞比例。CD4~+T细胞与CD4~+CD25high CD127~- Treg细胞共孵育后,FCM术测定CD4 T细胞分泌IL-17、IFN-γ、TNF-α及IL-2变化情况。结果与对照组及治疗病情稳定的MG患者相比,初治MG患者外周血IL-17~+CD4~+T细胞、IFN-γ+CD4~+T细胞、TNF-α~+CD4~+T细胞、IL-2~+CD4~+T细胞比例均显著升高(P<0.05)。MG患者与HC外周血CD4~+Foxp3~+Treg细胞比例比较差异无统计学意义(P>0.05)。对照组外周血CD4~+CD25high CD127~-Treg细胞可显著抑制CD4 T细胞分泌IL-17、IFN-γ、TNF-α和IL-2,而MG患者外周血CD4~+CD25high CD127~-Treg细胞抑制CD4+TT细胞分分泌细胞因子的能力显著降低。结论 MG患者外周血CD4~+Foxp3~+Treg细胞功能的丧失,致使外周血CD4~+T细胞细胞因子分泌能力增强,从而导致MG的发生和发展。     

非小细胞肺癌患者CD3+、CD4+、CD8+、CD44+表达的临床研究

目的研究非小细胞肺癌患者外周血淋巴细胞中CD3+、CD4+、CD8+、CD4+4的表达水平。方法取65例非小细胞肺癌患者及22例健康正常人外周静脉血,应用流式细胞仪检验非小细胞肺癌患者(实验组)与健康人外周血淋巴细胞中(对照组)CD3+、CD4+、CD8+、CD4+4的表达水平。结果实验组与对照组CD3+、CD3+CD4+、CD3+CD8+、CD4+4在淋巴细胞中的比例存在显著性差异(P<0.05),其中,实验组占总淋巴细胞的比例分别为48.07±10.33%、30.93±6.68%、17.13±3.37%、55.45±4.35%;对照组CD3+、CD3+CD4+、CD3+CD8+、CD4+4占总淋巴细胞的比例分别为58.83±10.88%、34.89±6.45%、23.91±4.42%、62.85±7.56%;但鳞癌与腺癌组CD4+4的表达无显著性差异(P>0.05),其中,鳞癌组CD4+4所占比例为61.32±8.06%,腺癌组为64.43±6.76%。结论非小细胞肺癌患者外周血T细胞亚群及CD4+4的表达水平较正常组均低,其表达水平与组织类型无关。     

淋巴细胞趋化因子在慢性阻塞性肺疾病患者外周血中的表达及其对CD4+CD8+T细胞亚群的影响

目的 探讨淋巴细胞趋化因子(lymphotactin,XCL1)对COPD患者外周血CD4+ T、CD8+T细胞亚群及有关炎症因子的影响及机制.方法 随机选取1 3例COPD患者(急性加重期和稳定期)和13名健康人,分离外周血T淋巴细胞进行培养,经淋巴细胞趋化因子干预后,用流式细胞仪分别检测外周血中CD4+T、CD8+T细胞亚群变化及其表面Fas、FasL表达,并用酶联免疫吸附试验(enzymelinked immunosorbent assay,ELISA)分别检测血清及细胞培养上清液中的XCL1、IL-2表达水平.结果 AECOPD及稳定期患者外周血中的XCL1的表达均高于健康对照组(P＜0.05),AECOPD组又高于稳定期组患者(P＜0.05).COPD患者(包括急性发作期与稳定期)T细胞培养液中,XCL1干预组与未干预组相比,XCL1、CD4+-Fas、CD4+-FasL、CD8+-Fas、CD8+-FasL表达增高(P＜0.05),CD4+/CD8+降低(P＜0.05),而IL-2表达减少(P＜0.05).且XCL1的表达与CD4+-Fas、CD4+ FasL、CD8+-Fas、CD8+-FasL的表达呈正相关,与IL-2的表达及CD4+/CD8+呈负相关.结论 XCL1参与了COPD的炎症过程,其参与炎症反应的机制可能是通过促进Fas、FasL的表达,导致CD4+T、CD8+ T细胞的凋亡增加,CD4+ T/CD8+T比值下降,造成CD4+/℃D8 +比例失衡,XCL1还可引起IL-2水平降低,间接导致机体免疫功能紊乱或低下,可能是导致COPD炎症持续存在的重要机制.     

Increased proportion of Fas positive CD8+ cells in peripheral blood of patients with COPD

Chronic obstructive pulmonary disease (COPD) is characterised by chronic inflammation in pulmonary tissue and is also associated with systemic effects. The objective of this study was determination of lymphocyte subpopulation and the expression of Fas receptor on lymphocytes derived from peripheral blood of patients with stable COPD (n=18) and a control group: asymptomatic smokers (n=12) and non-smokers (n=12). Flow cytometry method with monoclonal antibodies was used for evaluation of lymphocyte subsets: CD4+ and CD8+ and the expression of Fas (CD95) on T lymphocytes. We found an elevated proportion of CD8+ cells in the blood of COPD patients. Proportion of Fas+ T lymphocytes was significantly higher in patients with COPD when compared with asymptomatic smokers and non-smokers (mean: 84.4% vs. 71.6% vs. 61.0% for Fas+/ CD4+ and 88.1% vs. 73.8% vs. 58.3% for Fas+/CD8+ lymphocytes). The proportion of Fas positive CD8+ cells significantly correlated with the degree of airway obstruction and hypoxemia. The significant correlations of Fas positive CD4+ and Fas positive CD8+ with smoking history expressed as pack years smoked were observed. Our observation of an elevated proportion of circulating lymphocytes bearing Fas receptor may play a role in induction of these cells' apoptosis and indicate the role of Fas/ FasL pathway in the changes in proportion of lymphocyte subpopulations in patients with COPD.     

Intrathyroidal CD4+ T lymphocytes express high levels of Fas and CD4+ CD8+ macrophages/dendritic cells express Fas ligand in autoimmune thyroid disease.

In autoimmune thyroid disease (AITD), the proportion of CD4 lymphocytes is lower in the thyroid than in the peripheral blood. We examined both Fas and Fas ligand (FasL) expression in lymphocyte subsets and nonlymphoid mononuclear cells including monocytes, macrophages, and dendritic cells (M/DCs) in both peripheral blood and thyroid specimens from 11 patients with Graves' disease and 1 with Hashimoto's disease by three-color flow cytometry. Proportions and intensities of Fas expression were increased in CD4 single-positive (SP) (CD4(+) CD8(-)), CD8 SP (CD8(+) CD4(-) ), and CD4(+) CD8(+) double-positive (DP) lymphocytes in AITD thyroids compared to those in blood, and were much higher in CD4(+) (CD4 SP and DP) lymphocytes than in CD8 SP lymphocytes in the thyroid. In the blood, most M/DCs expressed only CD4, but approximately 60% of M/DCs expressed both CD4 and CD8 in AITD thyroid. The proportion of DP M/DCs expressing FasL was higher in thyroid than in blood; proportion and intensity of FasL expression were much higher in DP M/DCs than in CD4 SP and CD8 SP M/DCs in the thyroid. These data indicate that increased Fas expression in intrathyroidal CD4(+) T lymphocytes may be the cause of CD4 lymphocyte reduction in AITD thyroid, and that intrathyroid DP M/DCs with high FasL expression may be related to the reduction in AITD.     

Reduction in the suppressor-inducer T cell subset and increase in the helper T cell subset in thyroid tissue from patients with Graves' disease

The expression of surface markers associated with activation and characterization was compared among T cells in thyroid glands and peripheral blood of 10 patients with Graves' hyperthyroidism receiving chronic antithyroid drug therapy, in peripheral blood of 15 patients with untreated hyperthyroid Graves' disease, and in peripheral blood of 21 normal subjects using two-color flow cytometry. In the chronically treated Graves' disease patients, the percentage of activated T cells (HLA-DR+ T cells) among total T cells was significantly higher in thyroid tissue than in peripheral blood, and the increase in percent activated T cells was also significant among both helper/inducer T cell (CD4+ cell) and suppressor/cytotoxic T cell (CD8+ cell) subsets. The percentage of activated T cells in peripheral blood was not significantly different between chronically treated hyperthyroid Graves' patients and normal subjects, whereas the percentage of activated T cells in the peripheral blood from untreated hyperthyroid Graves' disease patients was significantly higher than that in normal subjects or chronically treated hyperthyroid Graves' patients. The percentages of CD4+ cells and CD8+ cells among total T cells were not different between thyroid tissues and peripheral blood in patients with chronically treated hyperthyroid Graves' disease. When CD4+ were further divided into helper T cells (CD4+2H4- cells) and suppressor-inducer T cells (CD4+2H4+ cells) using two-color flow cytometry, the percentage of helper T cells among CD4+ cells was significantly higher in thyroid tissue than in peripheral blood, resulting in an increased ratio of CD4+2H4- cells to CD4+2H4+ cells. The percentage of CD4+2H4+ cells in peripheral blood, however, was not significantly different among untreated and chronically treated Graves' disease patients and normal subjects. From the findings of abnormalities in intrathyroidal T cell subsets, we suggest that the decrease in the function of suppressor T cells within the thyroids of Graves' disease patients may be due to a decrease in CD4+2H4+ cells within thyroid tissue.     

T-lymphocyte subsets as noninvasive markers of cardiomyopathy

Fifty-eight patients with symptomatic congestive heart failure were examined for T-lymphocyte subsets in the peripheral blood using two-color laser flow cytometry as a noninvasive diagnostic procedure. The final diagnosis established by catheterization and endomyocardial biopsy were dilated cardiomyopathy (DCM, n = 24), myocarditis (MC) by the Dallas criteria (n = 12), and coronary heart disease (CHD, n = 16). The CD8+CD11- (cytotoxic T) subset was significantly low in patients with DCM (13.9 +/- 4.4 vs. controls, p less than 0.05) in comparison with MC (20.7 +/- 10.9) and CHD (22.3 +/- 5.9). Moreover, the CD4+2H4+ (suppressor/inducer T) subsets were higher in patients with DCM (27.3 +/- 6.9 vs. controls, p less than 0.01) than in those with MC (17.3 +/- 7.8) and CHD (15.6 +/- 7.9). The CD4/CD8 and CD4+2H4+/CD8+CD11- ratio were examined and compared with those of normal controls (NC n = 16). The CD4+2H4+/CD8+CD11- ratio was clearly higher in patients with DCM (2.2 +/- 0.9 vs. controls, p less than 0001) than in those with MC (1.1 +/- 0.6) CHD (0.9 +/- 0.7). A CD4+2H4+/CD8+CD11- ratio of greater than 1.6 was considered to facilitate diagnosis of dilated cardiomyopathy with 79% sensitivity and 70% specificity. There was no significant increase in the ratios between MC and CHD. However, the proportion of the CD8+Leu7+ (natural suppressor) subset of circulating T lymphocytes in patients with MC was statistically higher (19.1 +/- 6.3% vs. controls, p less than 0.05) than in DCM or CHD. An elevated ratio of CD4+2H4+/CD8+CD11- among peripheral blood lymphocytes may thus be a useful marker for differential diagnosis of dilated chronic cardiomyopathy from myocarditis and coronary heart disease.     

Increased Fas and Bcl-2 expression on peripheral mononuclear cells from patients with active juvenile-onset systemic lupus erythematosus

OBJECTIVE: To determine expressions of Fas and Bcl-2 on peripheral blood T and B lymphocytes from patients with juvenile-onset systemic lupus erythematosus (JSLE). METHODS: Thirty-eight patients with JSLE and 21 healthy controls were studied. Eleven JSLE patients with SLEDAI score >or= 8 were categorized as active. Freshly isolated peripheral blood mononuclear cells were stained for lymphocyte markers CD3, CD4, CD8, and CD19 and for Fas and Bcl-2 molecules. Cell protein expression was measured by 3-color flow cytometry. RESULTS: Percentages of lymphocytes positively stained for Fas antigen and cytoplasmic expression of Bcl-2 measured by mean fluorescence intensity from patients were significantly increased compared to controls on CD3+, CD4+, and CD8+ T cells. Patients with active disease had higher percentages of CD19+ B cells positive for Fas antigen compared to patients with inactive lupus. A direct statistical correlation was observed between Fas and Bcl-2 expression on CD19+ B cells and SLE Disease Activity Index score. CONCLUSION: Patients with juvenile-onset SLE show upregulation of apoptosis-related proteins. Patients with active and inactive disease have a different profile of Fas and Bcl-2 expression.     

Increased intensities of fas expression on peripheral T-cell subsets in severe autoimmune thyroid disease.

Fas (CD95)-Fas ligand (FasL; CD178)-induced apoptosis is necessary for the maintenance of self-tolerance. To clarify whether or not any abnormalities in the Fas-FasL system exist in patients with autoimmune thyroid disease (AITD), we examined the expression of Fas and FasL on peripheral T lymphocytes by three-color flow cytometry in 113 patients with AITD and 49 healthy controls. The intensities of Fas expression in both CD4(+) and CD8(+) T cells decreased in thyrotoxic patients with Graves' disease (GD), but increased in both patients with severe Hashimoto's disease (HD) undergoing treatment and seriously intractable patients with GD continuously positive for thyrotropin (TSH) receptor antibody despite treatment with antithyroid drugs for more than 5 years. The proportion of Fas expression was increased in CD4(+) T cells from patients with untreated GD, and in CD8(+) T cells from patients with severe HD. The proportion of CD8(+) T cells decreased in patients with severe HD. FasL were not expressed on T cells in controls and patients with AITD. These results indicate that (1). the intensities of Fas expression on peripheral T cells increase in severe autoimmune thyroid diseases and (2). both the intensity and the proportion of Fas expression may be important for the induction of apoptosis.     

Fas/Fas ligand expression and characteristics of primed CD45RO+ T cells in the inflamed mucosa of ulcerative colitis

BACKGROUND: Chronic immune activation in the colon is characteristic of ulcerative colitis (UC). Fas/Fas ligand (FasL) system is a mechanism responsible for activation-induced cell death (AICD), which maintains homeostasis within the immune system. Thus, Fas/FasL expression on activated colonic T cells of UC patients, as well as the susceptibility of such T cells to AICD was investigated in order to determine the role of activated colonic T cells in the long lasting inflammation in UC. METHODS: Fas, FasL, and CD45RO expression on peripheral blood and colonic T cells of UC patients were assayed by flow cytometry. Apoptosis of colonic T cells induced by anti Fas antibody was assessed using the terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end-labeling (TUNEL) assay. RESULTS: The majority of colonic T cells expressed both CD45RO and Fas in the colonic mucosa, a situation that was quite different from that in the peripheral blood. The number of CD45RO+CD8+ and Fas+CD8+ T cells was significantly lower in UC patients than the controls, unlike the number of Fas+CD4+ T cells. In contrast, the number of both CD45RO+CD4+ and CD45RO+CD8+ T cells in UC mucosa expressing FasL was significantly higher than in the controls. While Fas mediated apoptosis of CD45RO+CD8+ T cells was higher in UC patients than the controls, the number of apoptotic CD45RO+CD4+ T cells from UC mucosa was not. CONCLUSIONS: In UC patients, CD45RO+CD4+ T cells are less sensitive to apoptotic signals mediated by Fas. These phenomena may contribute to the pathogenesis of UC.     

强直性脊柱炎患者外周血CD8+CD28-T细胞的表达及意义

目的 探讨外周血CD8+CD28- T细胞在强直性脊柱炎(AS)发病中的作用.方法 应用流式细胞术检测50例AS患者和21名正常人外周血CD3+CD8+ T细胞表面CD28分子的表达,同时用免疫散射比浊法检测相应血清中的C反应蛋白(CRP).结果 AS患者外周血中的CD8+CD28- T细胞的表达明显高于正常人[(18±6)%对(14±5)%,P=0.020],患者外周血CD3+、CD8+CD28+ T细胞的表达明显低于正常人[(65±9)%对(69±8)%,P=0.039];[(15±5)%对(18±4)%,P=0.038],CD8+ T细胞的表达与正常人相比差异无统计学意义(P＞0.05).结论 AS患者外周血中的CD8+CD28- T细胞的表达增加,可能参与了AS的疾病过程.     

Apoptosis-induced decrease of intrathyroidal CD4(+)CD25(+) regulatory T cells in autoimmune thyroid diseases.

BACKGROUND: We previously showed that the proportion of CD4(+) T cells was lower and both the proportion and intensity of Fas expression on intrathyroidal CD4(+) T cells were higher in the thyroid than in the peripheral blood of patients with autoimmune thyroid disease (AITD). OBJECTIVE: To clarify whether the intrathyroidal CD4(+)CD25(+) regulatory T (Treg) cells are decreased by Fas-mediated apoptosis in patients with AITD. DESIGN: We examined intrathyroidal and peripheral lymphocytes in 20 patients with AITD (15 patients with Gravesa disease and five patients with Hashimotoas disease) and peripheral lymphocytes in 10 healthy volunteers by three-color flow cytometry. MAIN OUTCOME: The proportion of CD4(+)CD25(+) cells was lower in the thyroid of patients with AITD than in the peripheral blood of the same patients or the peripheral blood of the healthy subjects. The proportions of CD4(+)CD25(+)CD69() cells and Forkhead box P3 (Foxp3)(+)CD4(+)CD25(+) cells, which constitute more specific Treg subsets than CD4(+)CD25(+) cells, were also lower in the thyroid than in the peripheral blood of patients with AITD. The proportion of apoptotic cells was higher among intrathyroidal CD4(+) cells than among peripheral CD4(+) cells and higher among intrathyroidal CD4(+)CD25(+) cells than among intrathyroidal CD4(+)CD25() cells. CONCLUSION: These results indicate that intrathyroidal Treg cells are decreased in response to apoptosis in patients with AITD. This decrease in Treg cells may contribute to the incomplete regulation of autoreactive T cells in AITD.     

初治肺结核患者外周血Th1/Th2细胞的测定及临床意义

目的　探讨外周血CD 4 T淋巴细胞及其亚型 (Th1/Th2 )细胞在初治肺结核患者中的改变及临床意义 ,并了解其在结核病治疗过程中的变化。方法　利用流式细胞术对 10 5例初治肺结核患者、2 5名正常人外周血CD 4 T淋巴细胞进行直接计数 ,同时用 2 5ng/ml佛波酯 (PMA)、2 5 0ng/ml离子霉素 (ionomycin)对外周血细胞进行刺激 ,用 2 μmol/ml莫能霉素 (monensin)作蛋白转运抑制剂 ,5 %CO2培养 4 0～ 4 5h ,而后分别配对加入CD3 PC5 CD8 FITC INF γ PE/CD3 PC5 CD8 FITC IgG1 PE、CD3 PC5 CD8 FITC IL 4 PE/CD3 PC5 CD8 FITC IgG1 PE(PC5 :藻红蛋白 花青苷 5 ;FITC :异硫氰酸胍荧光素 ;PE :藻红蛋白 )单克隆抗体进行胞膜和胞内标记 ,进行流式细胞术检测Th1/Th2的百分含量。按病变程度分为重度 32例 ,中度 4 4例 ,轻度 2 9例。并对其中 6 7例肺结核患者在化疗强化期末、第 6个月化疗结束时进行同样指标的追踪检测 ,以了解在抗结核治疗过程中肺结核患者外周血CD 4 T细胞、Th1/Th2细胞的变化状况。结果　 (1)初治肺结核患者外周血CD 4 T细胞、Th1细胞水平显著低于健康对照组 ,其检测值分别为 (6 6 3± 16 0 )个 / μl、(9 5 6±3 6 0 ) %和 (735± 15 6 )个 / μl、(18 70± 5 0 3) % (P值均 <0 0 5