沙利度胺对系统性红斑狼疮患者外周血T淋巴细胞的免疫调节作用

目的 探讨沙利度胺(Thd)对系统性红斑狼疮(SLE)患者外周血T淋巴细胞的免疫凋节作用.方法 用四甲基偶氮唑蓝(MTT)比色法检测Thd对SLE患者外周血T淋巴细胞增殖的影响,用流式细胞术检测T淋巴细胞早期凋亡及CD3~+CD28~+和CD8~+CD152~+的表达,用实时定量聚合酶链反应(PCR)检测T淋巴细胞白细胞介素(IL)-6、IL-10、肿瘤坏死因子(TNF)-a mRNA的表达,采用单因素方差分析进行统计学处理.结果 在体外,500 μg/ml Thd组CD3~+CD28~+表达为(48±9)%显著低于对照组(57±9)%(P<0.05)、500μg/ml Thd组T淋巴细胞凋亡率为(36±8)%显著高于对照组(23±5)%(P<0.05);100、300、500μg/ml Thd组A_(570nm)值分别为:0.39±0.05、0.34±0.04、0.30±0.03较对照组(0.51±0.07)均有明显下降(P<0.05);100、500 μg/ml Thd组CD8~+CD152~+表达分别为(5.0±0.6)%、(7.8±0.7)%,明显高于对照组(4.2±0.6)%(P<0.05);500μg/ml Thd能抑制IL-6 mRNA的表达,各剂量组均抑制IL-10、TNF-a mRNA表达.结论 Thd可能通过抑制T淋巴细胞增殖、CD28的表达、IL-6、IL-10、TNF-a mRNA的表达和促进T淋巴细胞凋亡、CD152表达来下调SLE患者的免疫反应.     

共刺激分子CD28 CD152在类风湿关节炎患者T细胞亚群上表达异常的研究

目的观察共刺激分子CD28,CD152在类风湿关节炎(RA)患者的T细胞亚群上的表达异常情况,探讨RA的发病机制及治疗手段.方法用流式细胞仪采用直接免疫荧光法测定39例RA患者和20名健康对照人外周血T细胞表面标志CD3,CD4,CD8的表达情况及CD28,CD152在CD4+T和CD8+T细胞上的表达.结果 RA患者CD3+CD4+细胞较正常对照组显著增高(P＜0.01),CD3+CD8+细胞较正常对照组显著降低(P＜0.05),CD4+T细胞上CD28的表达较对照组显著降低(P＜0.05),而CD8+T细胞上CD28的表达与对照组差异无显著性(P＞0.05);CD4+T和CD8+T细胞上CD152的表达都较对照组显著增高(P＜0.01).结论在RA患者的细胞免疫活化过程中首先表现为B7/CD28信号途径占优势,T细胞被激活,激活的T细胞大量分泌CD152,它与CD28竞争结合B7分子,CD152/B7途径转而占优势,下调或终止T细胞反应.同时CD28+细胞数目的减少或功能缺陷造成RA患者外周血单个核细胞凋亡加速,是诱发RA患者的局部病理损害的原因.阻断CD152和B7的相互作用可增强特异性T细胞应答,为RA的免疫学治疗提供理论依据.     

间充质干细胞对狼疮肾炎T淋巴细胞的免疫调节作用

目的 探讨间充质干细胞(MSCs)在体外对狼疮肾炎(LN)外周血T淋巴细胞的免疫调节作用.方法 从人骨髓中分离培养MSCs,采用流式细胞仪(FCM)分析鉴定MSCs的纯度.在植物血凝素(PHA)刺激下,LN外周血T淋巴细胞与不同数量的MSCs共培养.分组:A组:T淋巴细胞;B组:MSCsI+T淋巴细胞(MSCsl:T=1:5);C组:MSCs2+T淋巴细胞(MSCs2:T=1:20);D组:MSCs3+T淋巴细胞(MSCs3:T=1:100).用四甲基偶氮唑蓝(MTT)比色法检测各组T淋巴细胞的增殖情况,FCM分析各组T淋巴细胞CD28和CD152的表达及T淋巴细胞调亡情况,实时定量反转录-聚合酶链反应(RT-PCR)检测各组T淋巴细胞的干扰素(IFN)-γ、白细胞介素(IL)-10、转化生长因子(TGF)-β1基因的水平.结果 在体外,MSCs对由PHA诱导的LNT淋巴细胞的增殖、凋亡均有抑制作用,且抑制作用与MSCs呈剂量依赖性.MSCs抑制T淋巴细胞CD28表达,对CD152的表达无明显影响.MSCs能促进LN患者T淋巴细胞TGF-β1基因的表达,抑制IL-10、IFN-γ基因的表达.结论 MSCs可能通过抑制T淋巴细胞增殖、减少T淋巴细胞凋亡、抑制T淋巴细胞CD28表达和促进T淋巴细胞TGF-β1,基因表达及抑制IL-10、IFN-γ基因表达来下调LN的免疫反应.     

艾拉莫德对类风湿关节炎患者CD3+T细胞IFN-γ及细胞因子IL-6调节作用的研究

目的检测艾拉莫德(T-614)对类风湿关节炎(RA)外周血单个核细胞(PBMC)CD3+T细胞IFN-γ表达、IL-6细胞因子水平变化,探讨T-614对RA治疗的免疫机制。方法 RA患者10例,采集患者全血,提取PBMC。T-614设为高剂量组、低剂量组分别为50μg/ml和5μg/ml,与PBMC共孵育24h后检测CD3+T细胞IFN-γ表达水平,并收集上清检测IL-6水平。结果共孵育培养24h,CD3+T细胞IFN-γ的表达,高、低剂量组与未加T-614的空白对照组分别为:5.39±1.12%、8.6±2.75%和17.91±5.93%,与对照组比较明显减低。培养24h收集上清,ELISA法检测IL-6水平,T-614高、低剂量与空白对照组分别为28.91±5.33μg/ml、62.31±15.02μg/ml和99.36±22.15μg/ml,与对照组比较明显减低。结论随着T-614浓度升高,通过抑制CD3+T细胞IFN-γ表达水平,降低细胞分泌因子IL-6水平,可能是T-614治疗RA的机制。     

异基因骨髓间充质干细胞对类风湿关节炎患者淋巴细胞的影响

目的 探讨在体外环境中,异基因骨髓间充质干细胞(BMSCs)对类风湿关节炎(RA)患者T、B淋巴细胞的增殖和功能成熟的影响.方法 采集健康供者的骨髓标本,经密度梯度离心分离、纯化获得其BMSCs,进行体外培养扩增.同时采集RA患者的外周血,分离单个核细胞.将来源于健康供者的BMSCs与来源于RA患者的单个核细胞在体外进行共培养,同时分别加入T淋巴细胞和B淋巴细胞刺激物.分别检测异基因BMSCs对RA患者T、B淋巴细胞增殖的影响;正常BMSCs对RA患者T淋巴细胞增殖周期和凋亡的影响;BMSCs对RA患者外周血T淋巴细胞CD3、CD4、CD8、CD25表达的影响;以及BMSCs对B细胞分泌IgG的影响.结果 正常骨髓来源的BMSCs对RA患者T、B淋巴细胞增殖均有抑制作用,并且这种抑制作用与BMSCs的剂量呈依赖性;与BMSCs共培养组的T细胞主要处于G0/G1期,而进入细胞增殖周期的细胞比例减少,同叶与BMSCs共培养组的凋亡比例(15.2±0.6)%明显低于单纯T细胞活化组(28.2±1.8)%;与BMSCs共培养后CD3+CD4+T细胞表达阳性率(34±6)较对照组(44±7)降低(P<0.05),CD25+的表达下降,但CD4+CD25+调节性T细胞数(4.9±2.3)增加(P<0.05).在SAC刺激下,健康人BMSCs与RA患者外周血淋巴细胞共培养后IgG分泌升高.结论 异基因BMSCs对RA患者T、B淋巴细胞的增殖和功能成熟均有影响,BMSCs可能在RA发病和病情进展中起一定的作用,同时证明利用MSCs来调节RA的免疫功能紊乱进行生物治疗是可行的.     

氨茶碱对健康人外周血T细胞及CD4~+亚群凋亡的影响

目的观察氨茶碱对分离培养的健康人外周血T细胞及CD4+亚群凋亡的影响。方法密度梯度离心法及尼龙棉柱法分离健康成年人外周血T细胞,及CD8阴性选择磁性分离健康成年人外周血CD4+T细胞。分两部分进行:①外周血T细胞分对照组、氨茶碱组(0.14～18μg/ml),培养72h后用流式细胞术检测凋亡率变化;②CD4+T细胞分对照组、小剂量氨茶碱组(1.13μg/ml)培养48～72h后用流式细胞术检测凋亡率变化。结果①T细胞的分离纯度为81.3%～94.5%,CD4+T细胞的分离纯度为84%～90%;②(0.14～18μg/ml)氨茶碱共培养人外周血T细胞72h后,其中氨茶碱1.13～18μg/ml组凋亡率差异有统计学意义(P值均<0.05);氨茶碱0.14～0.56μg/ml组凋亡率与阴性对照组比较差异无统计学意义;③氨茶碱1.13μg/ml组干预后,培养CD4+T细胞48～72h,经流式细胞术检测凋亡率,与阴性对照组相比,P值均<0.05,48h的凋亡率与72h者相比,差异有统计学意义(P<0.05)。结论小剂量氨茶碱(1.13μg/ml)可诱导人外周血T细胞和CD4+T细胞凋亡率增加。     

类风湿关节炎患者外周血Th17细胞的检测及意义

目的 探讨Th17细胞在类风湿关节炎(RA)患者外周血中的水平及意义.方法 分离RA患者和健康者外周血单个核细胞(PBMC),免疫磁珠阴选CD4~+T细胞,用或不用非特异性刺激剂(A-CD3、A-CD28),然后加佛波酯/离子霉素(PMA/Ion),经固定,透膜处理进行细胞内染色,流式细胞术(FCM)检测CD4~+T细胞内白细胞介素(IL)-17~+/干扰素(IFN)-γ~+、IL-17~+/IL-6~+水平.分组:①健康对照组;②RA病情稳定组;③RA病情活动组.结果 免疫磁珠阴选CD4~+T细胞纯度>90%.RA病情活动组IL-17表达水平(1.54±0.41)显著高于RA病情稳定组(0.70±0.21,P<0.01),二者又显著高于健康对照组(0.42±0.12,P<0.01).用A-CD3、A-CD28、IL-23刺激后,CD4~+T细胞IL-17胞内表达水平较无刺激组显著增加(P<0.05).CD4~+T细胞IFN-γ表达水平呈现与IL-17表达相似的特点,而RA患者与健康对照组IL-6表达水平差异无统计学意义.RA患者IL-17胞内表达水平与IFN-γ、IL-6无显著相关.结论 RA患者外周血CD4~+T细胞中存在异常增高的Th17细胞,且其水平与病情活动相关,有望作为判断RA患者病情活动的指标之一.     

IL-35对慢加急性肝衰竭患者外周血CD8+T淋巴细胞功能的影响

目的观察慢加急性肝衰竭(ACLF)患者血清IL-35表达水平,评估IL-35对ACLF患者CD8+T淋巴细胞功能的影响。方法纳入2018年11月-2019年4月在海南省人民医院就诊的ACLF患者28例和健康对照者14例,采用ELISA法检测血清IL-35水平。分选外周血CD8+T淋巴细胞,使用重组人IL-35刺激培养,应用实时定量PCR法检测CD8+T淋巴细胞中穿孔素、颗粒酶B和颗粒溶素mRNA水平,流式细胞术检测CD8+T淋巴细胞中程序性死亡分子-1(PD-1)和细胞毒性T淋巴细胞相关抗原4(CTLA-4)的表达。应用直接接触和间接接触共培养系统将HLA-A2限制性CD8+T淋巴细胞与HepG2细胞共培养,加入重组人IL-35后通过检测靶细胞死亡比率和细胞因子分泌评估CD8+T淋巴细胞的细胞毒性和非细胞毒性功能的变化。符合正态分布的计量资料2组间比较采用两独立样本t检验或配对t检验;不符合正态分布的计量资料2组间比较采用Mann-Whitney U检验;相关性分析采用Spearman秩相关分析。结果 ACLF患者血清IL-35水平[72. 32(54. 04～111. 30) pg/ml]较健康对照者[46. 00(27. 02～82. 29) pg/ml]显著升高(Z=2. 184,P=0. 020)。ACLF患者存在CD8+T淋巴细胞功能耗竭,主要表现为CD8+T淋巴细胞中穿孔素和颗粒酶B mRNA相对表达量降低、PD-1和CTLA-4阳性细胞比例升高、细胞杀伤(诱导靶细胞死亡)和非细胞杀伤功能(分泌IFNγ)下降(P值均0. 05)。使用重组IL-35刺激后,ACLF患者和健康对照者CD8+T淋巴细胞中穿孔素和颗粒酶B mRNA的相对表达量均显著降低,PD-1和CTLA-4的比例则显著升高,CD8+T淋巴细胞的直接细胞杀伤功能均显著降低(P值均0. 05)。结论升高表达的IL-35抑制ACLF患者CD8+T淋巴细胞的直接细胞杀伤功能,提示IL-35在ACLF中可能诱导细胞免疫功能耗竭。     

成纤维滑膜细胞p53基因表达对类风湿关节炎患者CD4+T淋巴细胞的调节

目的 研究人成纤维滑膜细胞(FLS)p53基因表达对类风湿关节炎(RA)患者CD4+T淋巴细胞的调节作用.方法 采用小分子干扰RNA(siRNA)转染抑制FKS内p53基因表达,并与RA患者外周血CD4+T淋巴细胞共同培养.检测转染后FLS中骨保护素(OPG)表达及白细胞介素(IL)-6分泌.并对与之共培养的CD4+细胞膜胞质内蛋白干扰素(IFN)-γ、IL-17、IL-4和CD25以及IFN-γ孤儿核受体γt(RORγt)、IL-17、Foxp3 RNA水平进行测定.结果 p53基因被抑制后,FLS分泌IL-6减少,但OPG表达未受影响.p53基因被抑制的FLS使共培养的CD4+T淋巴细胞内IL-17及IFN-γ蛋白和RNA表达上调,但对CD4+T淋巴细胞RORγt RNA影响不大.虽可上调Foxp3表达,但CD4+CD25high细胞阳性率并无明显变化.结论 FKS内D53表达对RA外周血Th1、Th17有调节作用.     

活动期类风湿关节炎患者外周血CD3+T淋巴细胞、NK细胞与IL-6水平的相关研究

目的探讨外周血T淋巴细胞、NK细胞分群在类风湿关节炎(RA)中的意义及与IL-6水平的相关情况。方法流式细胞仪法检测外周血淋巴细胞,记录20例RA患者和15例正常人的类风湿因子、血沉、抗核抗体(ANA)及免疫球蛋白、补体C3水平,ELISA法检测血清IL-6水平,并记录RA患者临床资料。结果活动期RA患者外周血CD3+T细胞计数与对照组分别为(68.8±7.8)、(62.3±4.2),活动期RA患者外周血CD3+T细胞计数轻度增高,但无统计学差异;RA患者外周血NK细胞(CD3-CD56+NK)计数与对照组分别为(9.8±1.8)、(12.3±2.0),RA患者明显低于对照组,P0.05;活动期RA患者IL-6水平高于对照组,分别为(13.8±4.4)ng/L、(4.8+3.0)ng/L,有统计学意义。结论IL-6水平增高、CD3+T细胞和NK细胞表达失衡,其各自免疫调节作用在RA中可能体现不同的效应作用,RA的发病机制中三者间可能具有相互调节的免疫机制。     

沙利度胺对大鼠急性坏死性胰腺炎保护作用的实验研究

目的 探讨沙利度胺对大鼠急性坏死性胰腺炎(ANP)的保护作用及机制.方法 54只SD大鼠按数字表法随机分成ANP组、沙利度胺组和对照组,每组18只.采用5%牛磺胆酸钠胰胆管逆行注射方法建立ANP模型.沙利度胺组于建模后1 h予沙利度胺200 mS/kg体重灌胃.术后3、6、12 h分批处死大鼠,观察腹水量;ELISA法检测血清TNF-α、IL-6、IL-18水平;流式细胞术检测外周血CD4+、CD8+T细胞比例;RT-PCR法检测胰腺组织TNF-α mRNA表达;免疫组化法检测胰腺组织细胞间黏附分子1(ICAM-1)蛋白表达;行胰腺常规病理检查.结果 术后6 h,对照组的腹水量,血清TNF-α、IL-6、IL-18水平和CD4+、CD8+T 细胞比例,胰腺组织TNF-α mRNA及CAM-1蛋白表达,病理评分分别为(1.03±0.31)ml、(57.17±11.29)pg/ml、(24.45 ±4.14)pg/ml、(64.23 ±21.85)pg/ml、(47.58±9.21)%、(40.88±2.96)%、0.07±0.02、0.57±0.30、0.67±0.81;ANP组分别为(3.63±0.38)ml、(107.54±33.05)pg/ml、(47.30±11.40)pg/ml、(367.76±108.43)pg/ml、(54.90±7.15)%、(17.17±3.12)%、0.65±0.26、3.20±0.57、11.50±1.87;沙利度胺组分别为(1.45±0.53)ml、(80.60±20.48)pg/ml、(26.61±10.85)pg/ml、(321.82±85.20)pg/ml、(29.80±2.19)%、(15.52±1.96)%、0.35±0.23、2.37±0.67、8.00±3.03.ANP组除CD8+T细胞比例显著降低外,其余指标均较对照组显著增加(P值均<0.05).沙利度胺组指标均显著低于ANP组(P值均<0.05).结论 沙利度胺能通过抑制TNF-α表达,减少炎症递质的释放,从而减轻ANP大鼠的胰腺病理损害.     

Therapeutic and prophylactic thalidomide in TNBS-induced colitis: Synergistic effects on TNF-α, IL-12 and VEGF production

AIM: To evaluated the therapeutic and prophylactic effect of thalidomide on 2, 4, 6-trinitrobenzene sulfonic acid (TNBS)-induced colitis. Thalidomide has been reported to downregulate the expression of tumor necrosis factor α (TNF-α), IL-12, and vascular endothelial growth factor (VEGF), hallmarks of intestinal inflammation in Crohn's disease (CD).METHODS: Male Wistar rats were divided in five groups of ten animals each. Four groups received a rectal infusion of TNBS in ethanol. The first group was sacrificed 7 d after colitis induction. The second and third groups received either thalidomide or placebo by gavage and were sacrificed at 14 d. The fourth group received thalidomide 6 h before TNBS administration, and was sacrificed 7 d after induction. The fifth group acted as the control group and colitis was not induced. Histological inflammatory scores of the colon were performed and lamina propria CD4+ T cells, macrophages, and VEGF+ cells were detected by immunohistochemistry. TNF-α and IL-12 were quantified in the supernatant of organ cultures by ELISA.RESULTS: Significant reduction in the inflammatory score and in the percentage of VEGF+ cells was observed in the group treated with thalidomide compared with animals not treated with thalidomide. Both TNF-α and IL-12 levels were significantly reduced among TNBS induced colitis animals treated with thalidomide compared with animals that did not receive thalidomide.TNF-α levels were also significantly reduced among the animals receiving thalidomide prophylaxis compared with untreated animals with TNBS-induced colitis. Intestinal levels of TNF-α and IL-12 were significantly correlated with the inflammatory score and the number of VEGF+ cells.CONCLUSION: Thalidomide significantly attenuates TNBS-induced colitis by inhibiting the intestinal production of TNF-α, IL-12, and VEGF. This effect may support the use of thalidomide as an alternate approach in selected patients with CD.     

Interleukin-11 induces proliferation of human T-cells and its activity is associated with downregulation of p27(kip1)

BACKGROUND AND OBJECTIVES: We have recently shown that interleukin (IL-)11 induces polarization of human T-cells by inhibiting macrophage production of IL-12 and by exerting a direct effect on CD4+ T-cells. In this study, we investigated the effects of IL-11 on the kinetic activation and apoptosis of T-cell subsets stimulated with anti-CD3/CD28 antibodies, anti-CD3 and IL-2 or dendritic cells. DESIGN AND METHODS: Apoptosis and cell cycle analysis of T-cells were assessed by double staining with propidium iodide and intracellular Ki-67 and by acridine orange staining. The expression of the negative regulator of the cell cycle p27Kip1 (p27) was also determined by flow cytometry. RESULTS: Our results show that 18 hours of incubation with IL-11 resulted in a significantly higher number of cycling CD4+ cells, CD4+CD45RA+ naive T-cells and CD4+CD45RO+ memory T-cells, but not of CD8+ cells. The kinetic activity of IL-11 was observed up to 72 hours, when the peak value of S-phase cells occurred. IL-11 also significantly enhanced CD4+ and CD4+CD45RA+ cell proliferation when T-cells were co-incubated with allogeneic dendritic cells. Conversely, IL-11 did not protect any of the T-cell subsets from apoptosis. At the functional level, a type-2 cytokine pattern of cultured T-lymphocytes was observed after 5 days of incubation with IL-11. Proliferation and functional activation of T-cells were preceeded by downregulation of p27, which occurred as early as 12 hours after incubation with IL-11. INTERPRETATION AND CONCLUSIONS: IL-11 induces Th-2 polarization and cell-cycle entry of human CD4+, CD4+CD45RA+ and CD4+CD45RO+cells and their activation is associated with the downregulation of p27.     

Systemic CD4+ and CD8+ T-cell cytokine profiles correlate with GOLD stage in stable COPD

Chronic obstructive pulmonary disease (COPD) is associated with pulmonary and systemic inflammation. Both CD4+ and CD8+ T-lymphocytes play a key role in COPD pathogenesis, but cytokine profiles in circulating T-lymphocytes have not been well characterised. Here we report the analysis of peripheral blood T-cells from 30 stable COPD patients and 10 healthy never-smokers for interferon (IFN)-γ, interleukin (IL)-4, tumour necrosis factor (TNF)-α and the T-helper 17 cytokines IL-17A, IL-17F and IL-22 by intracellular flow cytometry. We found significantly increased proportions of IFN-γ+ and TNF-α+ CD8+ T-cells in COPD patients, when compared with healthy controls. This was most evident in patients with less severe disease. In contrast, expression profiles in circulating CD4+ T-cells were similar in COPD patients and healthy controls for all cytokines tested, except for IL-17F. COPD patients with more severely reduced diffusing capacity had lower proportions of IL-17A+ CD4+ T-cells. Proportions of IL-22+ cells in the CD4+ memory T-cell population were significantly increased in active smokers, when compared with past smokers. Collectively, this comprehensive cytokine analysis of circulating T-cells in COPD patients revealed a correlation for CD8+ T-cells between Global Initiative for Chronic Obstructive Lung Disease (GOLD) stage and IFN-γ or TNF-α expression, but not for CD4+ T-cells.     

Thalidomide in treatment of connective diseases and vasculities

Thalidomide is an immunomodulatory, anti-inflammatory and anti-angiogenic drug. Thalidomide exerts its effects by decreasing circulating CD4 positive T-cells and stimulating CD8 positive T-cells, by increasing the number of Natural Killer cells and T-helper 2 cells. Thalidomide also inhibits proliferation of stimulated T-cells and leukocyte chemotaxis. It modifies a number of integrin receptors and other leukocytic surface receptors and down-modulates cell-adhesion molecules involved in leukocyte migration. It has been demonstrated that thalidomide inhibits TNFalpha, IL-5, IL-6, IL-8, IL-12 production and increases production of IL-2, IL-10 and INFgamma. Moreover thalidomide plays an important role in inhibition of VEGF and FGF-2 mediated angiogenesis. Although the exact mechanism of action is not fully understood and only limited treatment opinions exist, thalidomide plays a role also in connective diseases and vasculities. Thalidomide has been seen efficacious in the treatment of cutaneous disorders in patients with systemic lupus erythematosus and in mucocutaneous disease in Behcet's disease with a not dose-dependent response, even if it should be restricted to selected patients because of its important side effects.     

沙利度胺对人脐静脉内皮细胞增殖和血管生成的影响

目的 探讨沙利度胺治疗血管发育不良所致消化道出血的机制.方法 体外培养人脐静脉内皮细胞至对数生长期,分为空白对照组、溶剂对照组(二甲基亚砜)和不同浓度(10、20、40、60、80、100μg/ml)沙利度胺组,根据加或不加成纤维细胞生长因子(bFGF,10 ng/ml),共分为16组.刺激72 h后,MTT法检测细胞增殖情况,酶联免疫吸附法和实时定量PCR法测定血管内皮生长因子(VEGF)、肿瘤坏死因子-α(TNF-α)表达.结果 加或不加bFGF刺激,中、高浓度(≥40/μg/ml)沙利度胺均能抑制人脐静脉内皮细胞增殖.未加bFGF刺激时.20μg/ml沙利度胺能明显抑制VEGF表达.加bFGF刺激时,10 μg/ml沙利度胺即能明显抑制VEGF表达.未检出TNF-α表达.结论 体外实验中,沙利度胺能抑制人脐静脉内皮细胞增殖和VEGF表达,从而抑制血管生成,达到治疗血管发育不良所致消化道出血的目的 .     

The effect of methotrexate (MTX) on expression of signalling lymphocytic activation molecule (SLAM) in patients with rheumatoid arthritis (RA) and its role in the regulation of cytokine production

OBJECTIVE: To investigate the effect of methotrexate (MTX) on cytokine production by activated CD4+ T-cells in patients with rheumatoid arthritis (RA). METHODS: The effect of MTX on intracellular expression of interferon-gamma (IFN-gamma) and interleukin-4 (IL-4), and cell surface expression of signalling lymphocytic activation molecule (SLAM) from freshly isolated peripheral blood mononuclear cells (PBMCs), and after in vitro culture with or without MTX, was analysed with flow cytometry in 18 patients with RA and 20 healthy controls. RESULTS: Intracellular expression of IFN-gamma and IL-4 on freshly isolated CD4+ T-cells was significantly higher in patients with RA than in the controls (p<0.05). Intracellular expression of both IFN-gamma and IL-4 after culture with MTX was significantly lower than those after culture without MTX in patients with RA. Although no significant difference was observed in SLAM expression on freshly isolated CD4+ T-cells between patients with RA and the controls, MTX significantly decreased SLAM expression on both activated IFN-gamma+ and IL-4+CD4+ T-cells in patients with RA. CONCLUSION: In vitro modulation of the cytokine network by MTX, IFN-gamma, and IL-4 is one of the major targets for MTX, and production of IFN-gamma and IL-4 by PBMCs may be suppressed by SLAM on activated CD4+ T-cell in patients with RA.     

脂多糖诱导巨噬细胞中核受体协同抑制因子启动子甲基化对炎症因子的调控作用

目的探讨核受体协同抑制因子(NCOR)在脂多糖(LPS)诱导巨噬细胞炎症反应中的作用及其调控机制。方法 1μg/ml的LPS分别处理小鼠巨噬细胞RAW264.7 24 h和48 h,应用Western blot和Real time-PCR检测NCOR的表达水平以及肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)mRNA水平,荧光素酶报告基因检测核因子-κB(NF-κB)的启动子活性。LPS处理细胞48 h后,应用MSP检测NCOR启动子是否发生甲基化以及Western blot检测DNMT3b的表达变化。Real time-PCR检测5'-aza和LPS联合处理细胞后NCOR mRNA的表达水平;转染DNMT3b siRNA后,分别应用Western blot和Real time-PCR检测DNMT3b的表达水平,以及DNMT3b siRNA和LPS联合作用下NCOR、TNF-α、IL-6的表达水平和NF-κB的启动子活性。结果 LPS干预细胞24、48 h后,NCOR蛋白和mRNA表达显著下调(P0.05),而TNF-α、IL-6 mRNA表达水平、DNMT3b蛋白的表达水平以及NF-κB的启动子活性显著上升(P0.05)。MSP检测说明LPS可介导NCOR的启动子甲基化。用5'-aza和LPS联合处理细胞后NCOR mRNA水平较LPS组有显著上升(P0.05)。采用DNMT3b siRNA可显著下调DNMT3b蛋白和mRNA水平,并可部分逆转LPS介导的抑制NCOR表达的效应,抑制TNF-α、IL-6的表达水平和NF-κB的启动子活性(P0.05)。结论 NCOR启动子的甲基化是LPS介导巨噬细胞炎症反应发生、发展的关键步骤,其可作为治疗ALI/ARDS的潜在靶点。     

ADMA对单核细胞来源的树突状细胞成熟和免疫的影响

目的:通过观察非对称性二甲基精氨酸(ADMA)对树突状细胞(dendritic cells,DCs)成熟及免疫的影响来探讨AS形成的可能机制。方法:贴壁法分离人外周血单核细胞,在含重组人粒-巨噬细胞集落刺激因子(rhGM-CSF 20ng/ml)和重组人白细胞介素-4(rhIL-4,10ng/ml)的完全培养基中培养,五天后收集imDC,用1、8、16umol/L的ADMA干预未成熟DC 24h。用流式细胞术检测DC细胞表面分子的表达、吞噬能力及DC的凋亡,用混合淋巴细胞反应检测成熟DC刺激T淋巴细胞增殖的能力,用ELISA检测DC细胞因子的分泌。结果:生理浓度ADMA并不刺激DC成熟及分化;但病理浓度ADMA抑制DC成熟;抑制DC诱导的T淋巴细胞增殖;诱导DC凋亡:抑制DC分泌IL-12细胞因子、TNF-α及IL-10细胞因子。结论:生理浓度ADMA并不刺激DC成熟及分化;但病理浓度AD-MA抑制DC成熟和免疫。