Th17及Th1相关细胞因子与支气管哮喘的关系研究

目的:分析外周血Th17、Th1及相关细胞因子表达水平和支气管哮喘(bronchial asthma,BA)发生、发展的相关性研究。方法:回顾选取我院收治的BA病例57份,称作BA组,另选取呼吸系统正常的病例55例为对照组,检测两组入选者的外周血IL-2、TNF-α、Th17、IL-6、Th1指标表达差异,并进行多因素回归分析。结果:BA组Th17(0.62±1.67)%、Th1(1.45±0.48)%及Th1/Th17(2.33±1.28)均显著低于对照组(P均0.05);BA组TNF-α(27.46±8.12)pg/mL、IL-6(11.69±2.14)pg/mL表达量显著高于对照组,IL-2(2.58±3.89)pg/mL、IFN-γ(3.74±6.15)pg/mL含量均显著低于对照组(P均0.05);经Logistic回归分析,TNF-α、IL-6、IFN-γ、Th1/Th17、IL-2均和BA有密切相关性(P均0.05)。结论:IL-2、IFN-γ、Th1/Th17、TNF-α、IL-6表达水平均与BA有密切关联,可能是参与BA发病的主要原因,及早进行Th17、Th1及相关细胞因子检查有助于明确病情。     

Deviated balance between Th1 and Th17 cells exacerbates acute graft-versus-host disease in mice

BackgroundTh1/Th17 imbalance had been indicated to mediate several kinds of inflammatory diseases. We deduce that Th1/Th17 imbalance might also contribute to the pathogenesis of acute graft-versus-host disease (GVHD). This study is to investigate the relation between Th1/Th17 imbalance and acute GVHD.MethodsWe applied a murine GVHD model of C57BL/6 (H-2^b) donor to BALB/c (H-2^d) recipient by treating the recipients with low dose of halofuginone (HF), which is competent in selectively inhibiting Th17 differentiation and facilitating Th1 differentiation. Recipient mice were monitored for survival rate, body weight change, clinical symptoms and pathological evidence of acute GVHD. We also measured the proportions of Th1 and Th17 cells in circulation and expression levels of IFN-γ and IL-17A in tissues involved in GVHD.ResultsFirstly, we confirm the existence of Th1/Th17 imbalance in acute GVHD and Th1/Th17 imbalance positively correlates with severity of acute GVHD. Secondly, low dose of HF augments Th1/Th17 imbalance by driving the Th1/Th17 balance to a Th1-dominant reaction. Finally, augmented Th1/Th17 imbalance leads to aggravated systemic GVHD. An increased Th1-type reaction results in aggravated hepatic and intestinal GVHD, and inhibiting Th17 differentiation is sufficient to alleviate pulmonic impairment.ConclusionOur study is indicative for a critical role of Th1/Th17 imbalance in the pathogenesis of murine GVHD.     

Role of interleukin-17 in a murine community-associated methicillin-resistant Staphylococcus aureus pneumonia model

Interleukin (IL)-17 is a key member of the Th17 cytokines and has been reported to be involved in the pathomechanisms underlying various diseases, including infectious diseases. Infections with community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) have garnered worldwide attention, and the representative USA300 strain is known to cause pneumonia in healthy people, which can be lethal. However, little is known about the role of IL-17 in CA-MRSA pneumonia. In this study, we investigated the role of IL-17 in a CA-MRSA pneumonia animal model. Mortality was higher and occurred at an earlier stage of infection in the IL-17A-knockout mice than in the wild-type (P < 0.01) and IL-17A/F-knockout mice (P < 0.05); however, no significant difference in the intrapulmonary bacterial counts was observed among the three groups of mice. Moreover, the IL-17A-knockout group showed significantly higher levels of IL-17F and granulocyte-colony stimulating factor (G-CSF) and a significantly higher neutrophil count in the bronchoalveolar lavage fluid than the other groups. These results confirmed that G-CSF expression significantly increased, and significant neutrophilic inflammation occurred under conditions of IL-17A deficiency in the murine CA-MRSA pneumonia model.     

Direct correlation between Th1 and Th17 responses in immunity to Brucella infection

Th1 cells play a central role in immunity to brucellosis, while the exact role of Th17 cells has remained unknown. This study aimed to evaluate the peripheral distributions of Th1 and Th17 cells and serum levels of IFN-γ, IL-17A and IL-22 cytokines in brucellosis patients. One hundred patients (36 acute, 41 under-treatment and 23 relapsed) and 30 age- and sex-matched healthy controls were included. The frequencies of Th1 and Th17 cells were determined by flow cytometric analysis. Serum levels of IFN-γ, IL-17A and IL-22 were measured by multi-analyte flow assay. Increased frequencies of Th1 and Th17 cells were observed in acute and relapsed brucellosis versus under-treatment patients and healthy controls (P < 0.05). The mean serum levels of IFN-γ were significantly elevated in acute and relapsed groups compared to under-treatment patients (P = 0.002 and P = 0.01 respectively). Acute patients showed higher levels of IL-22 than under-treatment (P = 0.008). Direct correlations were found between increased frequencies of Th1 and Th17 cells in acute and relapsed patients (P = 0.007 and P = 0.001 respectively) and between IL-17A and IL-22 in both groups of patients. Our findings indicate a cooperative role for Th1 and Th17 cells in immunity to brucellosis which is more evident during acute and relapse phases of brucellosis.     

自噬参与原发性胆汁性胆管炎患者Th17/ Treg免疫失衡的研究

目的:Th17/Treg免疫失衡在原发性胆汁性胆管炎(PBC)的发病机制中起到关键作用。自噬是调节T细胞稳态的重要环节。本研究旨在探索自噬对PBC患者Th17/Treg免疫失衡的影响。方法:选取20例初次诊断的PBC患者,20例健康对照者,收集其外周血单个核细胞(PBMCs)。利用流式细胞术检测PBC患者与健康对照者PBMCs中Th17和Treg细胞分布及其胞内自噬的水平,进一步体外利用氯喹抑制自噬,证实自噬对PBC患者Th17/Treg平衡的影响。结果:相较于健康对照者,PBC患者Th17细胞占CD4~+T比例上升(P0.05),且血清中IL-17含量较高(P0.01);Treg细胞比例下降(P0.05),且血清中TGF-β含量较低(P0.01)。而PBC患者Th17细胞和Treg细胞内自噬水平均升高。另外,体外实验结果证实,自噬抑制剂氯喹能够有效地恢复PBC患者PBMCs中Th17/Treg平衡。结论:异常活化的自噬可导致PBC患者Th17/Treg免疫失衡,抑制自噬能够在体外恢复此平衡。因此,对异常自噬的干预可能将成为PBC疾病治疗的新方法。     

Frequency and functional activity of Th17, Tc17 and other T-cell subsets in Systemic Lupus Erythematosus

To compare frequency and functional activity of peripheral blood (PB) Th(c)17, Th(c)1 and Treg cells and the amount of type 2 cytokines mRNA we recruited SLE patients in active (n = 15) and inactive disease (n = 19) and healthy age- and gender-matched controls (n = 15). The study of Th(c)17, Th(c)1 and Treg cells was done by flow cytometry and cytokine mRNA by real-time PCR. Compared to NC, SLE patients present an increased proportion of Th(c)17 cells, but with lower amounts of IL-17 per cell and also a decreased frequency of Treg, but with increased production of TGF-β and FoxP3 mRNA. Ιn active compared to inactive SLE, there is a marked decreased in frequency of Th(c)1 cells, an increased production of type 2 cytokines mRNA and a distinct functional profile of Th(c)17 cells. Our findings suggest a functional disequilibrium of T-cell subsets in SLE which may contribute to the inflammatory process and disease pathogenesis.     

多发性肌炎肌组织中Th17 细胞的浸润

目的:探讨多发性肌炎(PM)患者肌肉炎性组织中是否存在Th17细胞及数量多少。方法:临床和病理诊断确诊的多发性肌炎患者16例;对照组来自非炎性肌病患者6例。应用免疫荧光组织化学方法检测Th17淋巴细胞的定位及数量。结果:与非肌炎患者比较,免疫荧光组织化学检测到肌炎患者肌肉组织中IL-17表达阳性,主要分布在细胞内,且细胞数量的多少与炎症的严重程度成正相关。结论:Th17细胞有可能参与了多发性肌炎的发病过程。     

Th17/Treg失衡与肝脏免疫病理反应的研究进展

Th17细胞及Th17/Treg失衡在炎症反应、组织损伤及纤维化形成中发挥了重要作用,与多种疾病的发生发展密切相关。前炎性细胞因子可诱导T细胞分化为Th17,使Th17/Treg失衡,导致IL-17、IL-6、趋化因子等促炎性细胞因子大量分泌并有效介导中性粒细胞动员与兴奋,使得机体产生炎症反应与免疫病理反应。就Th17/Treg细胞及其失衡在肝脏免疫病理反应中的研究进展进行了综述。     

A critical role of LFA-1 in the development of Th17 cells and induction of experimental autoimmune encephalomyelytis

Snu13p is a Saccharomyces cerevisiae protein essential for pre-messenger RNA splicing and pre-ribosomal RNA processing. Snu13p binds U4 snRNA of the spliceosome and box C/D snoRNAs of the pre-ribosomal RNA processing machinery to induce assembly of each ribonucleoprotein complex. Here, we present structural and biochemical analysis of Snu13p. The crystal structure of Snu13p reveals a region of the protein which could be important for protein interaction during ribonucleoprotein assembly. Using the structure of Snu13p we have designed the first temperature-sensitive mutants in Snu13p, L67W and I102A. Wild-type and mutant Snu13p proteins were assayed for binding to U4 snRNA and U3 snoRNA. Both temperature-sensitive mutants displayed significantly reduced RNA binding compared to wild-type protein. As the temperature-sensitive mutations are not in the known RNA binding region of Snu13p this indicates that these mutants indirectly influence the RNA binding properties of Snu13p. This work provides insight into Snu13p function during ribonucleoprotein assembly.     

Sphingosine kinase 1 protects renal tubular epithelial cells from renal fibrosis via induction of autophagy

Autophagy is an important homoeostatic mechanism for the lysosomal degradation of protein aggregates and damaged cytoplasmic components. Recent studies suggest that autophagy which is induced by TGF-β1 suppresses kidney fibrosis in renal tubular epithelial cells (RTECs) of obstructed kidneys. Sphingosine kinase 1(SK1), converting sphingosine into endogenous sphingosine-1-phosphate (S1P), was shown to modulate autophagy and involved in the processes of fibrotic diseases. Since SK1 activity is also up-regulated by TGF-β1, we explored its effect on the induction of autophagy and development of renal fibrosis in this study. In vitro, SK1 expression and activity were markedly increased by TGF-β1 stimulation in a time and concentration dependent manner, and concomitant changes in autophagic response were observed in HK-2 cells. Further, knockdown of SK-1 led to a decrease of autophagy whereas overexpression of SK1 caused a greater induction of autophagy. In addition, overexpression of SK1 resulted in decreased of mature TGF-β levels through autophagic degradation. In vivo, SK1 enzymatic activity and autophagic response were both up-regulated in a mouse model of kidney fibrosis induced by unilateral ureteral obstruction (UUO); meanwhile, increased of mature TGF-β1 and deposition of extracellular matrix (ECM) were observed in tubulointerstitial areas compared with sham-operated mice. However, aggravation of renal fibrosis was detected when SK1 inhibitor PF-543 was applied to suppress SK1 enzymatic activity in UUO mice. At the same time, autophagy was also inhibited by PF-543. Thus, our findings suggest that SK1 activation is renoprotective via induction of autophagy in the fibrotic process.     

Ursolic acid inhibits Th17 cell differentiation via STAT3/RORγt pathway and suppresses Schwann cell-mediated Th17 cell migration by reducing CXCL9/10 expression

Th17 cells represent important immune cells. Ursolic acid (UA) can regulate immune cell activities. This study was aimed to explore the effects of UA on Th17 cell differentiation and Schwann cell(SCs)-mediated migration and the potential mechanism. Naïve CD4⁺ T cells were isolated from rat peripheral blood, induced for Th17 cell differentiation, and treated with UA. The proportion of Th17 cells was detected by flow cytometry assay. SCs were co-cultured with Th17 cells. Th17 cell migration was detected by Transwell assay. The molecule expression was determined by Western blot and qRT-PCR. UA inhibited the Th17 cell differentiation and suppressed the STAT3/RORγt pathway. STAT3 overexpression up-regulated p-STAT3 and RORγt expression and promoted Th17 cell differentiation under the UA treatment. In LPS- and IFN-γ-stimulated-SCs, UA suppressed the expression of chemokines CXCL9/10, but had no significant effect of CCL20 expression. The expression CXCL9/10 receptor CXCR3 was higher in Th17 cells than that in Treg cells, while the expression CCL20 receptor CCR6 was lower in Th17 cells than that in Treg cells. UA, anti-CXCR3, and anti-CCR6 treatment inhibited SCs-mediated Th17 cell migration, and anti-CXCR3 exerted stronger inhibitory effect than Anti-CCR6. UA inhibited Th17 cell differentiation through STAT3/RORγt pathway and suppressed Th17 cell migration through down-regulating CXCL9/10 expression in SCs.     

Th17细胞分化、调节及效应研究进展

Th17细胞作为一个不同于Th1、Th2的细胞亚群,已经被证实在自身免疫病、感染等疾病中发挥重要的作用.为了进一步认识Th17细胞的效应机制,近来对于Th17细胞的分化及调节进行了深入的研究,证实TGF-β与IL-6或者IL-21的协同作用是诱导Th17细胞分化的关键因素,而IL-23在促进IL-17分泌,增强Th17细胞效应功能方面发挥重要作用.与Th1、Th2、Treg细胞特异性的转录调节因子T-bet、GATA3、Foxp3相对应,现证实ROR-γt(retinoid-related orphanreceptors-γr)是促进Th17细胞分化、调节其功能的特异性转录调节因子.Th17细胞通过分泌IL-17A、IL-17F、IL-21、IL-22、IL-6、TNF-α等细胞因子发挥效应功能.其中IL-21作为Th17细胞的一个自分泌调节凶子,在诱导Th17分化、抑制Th1、Treg功能方面发挥关键作用.而另一方面,近来发现,重要的T细胞生长因子IL-2在维持、促进Th1、Th2、Treg及CD8 T细胞功能活性的同时,却发挥着抑制Th17细胞分化的作用.Th1、Treg、Th17细胞的分化之间存在微妙的调节关系,TGF-β的水平、作用的时间决定着上述三群T细胞的分化结局.Th17细胞与Th1细胞均是自身免疫病及感染性疾病的重要效应细胞,二者的作用是否有时间、空间、功能方面的特异性?TGF-β如何调节两群效应细胞的分化方向及功能?以及Th17细胞在体内免疫平衡中的作用,是否可以通过Th17细胞诱导免疫耐受等,是人们急于回答的非常有意义的课题.     

SGK1 Governs the Reciprocal Development of Th17 and Regulatory T Cells

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隐球菌性脑膜炎患者外周血中Th9和Th17细胞水平变化及意义

目的：比较初发隐球菌性脑膜炎患者治疗前后与健康对照人群外周血 CD4＋ T 细胞中 Th9和 Th17细胞的比值,探讨 Th9和 Th17细胞在隐球菌性脑膜炎发病机制中的作用。方法选取初发未经治疗隐球菌性脑膜炎患者及健康对照各12例,抽取隐球菌性脑膜炎患者治疗前和治疗后3周及健康对照的外周血,分离外周血单核细胞,应用流式细胞仪检测技术对3组病例外周血 CD4＋ T 细胞中 Th9和 Th17的比值进行比较。结果与健康对照相比,隐球菌性脑膜炎患者治疗前Th17表达下调,差异有统计学意义;在治疗好转患者中,治疗后 Th17表达显著上调,与治疗前及健康对照相比差异均有统计学意义。Th9在治疗前与健康对照相比无差异,在治疗后隐球菌性脑膜炎患者中表达上调。结论 Th17免疫途径是隐球菌性脑膜炎患者抵御隐球菌感染的重要免疫机制,隐球菌性脑膜炎发病及治疗拮抗可能与 Th17缺乏有关。     

Th17细胞及白细胞介素-17在肝移植急性排斥反应中的意义

目的探讨Th17细胞及相关因子白细胞介素-17（IL-17）在肝移植急性排斥反应中的变化及意义。方法收集2011年1月至2012年12月大连医科大学附属第二医院肝移植手术患者28例,根据移植肝组织穿刺活检病理诊断结果将肝移植的28例患者分为急性排异反应组6例和无排斥反应稳定组22例,15名健康体检者作为对照组。急性排斥组及稳定组在移植术后3 d和7 d,行肝穿刺活检病理检查;同时检测受检者外周血Th17细胞,受检者血清中IL-17水平。结果移植肝穿刺活检病理诊断显示急性排斥组随着移植时间延长,排斥反应逐渐增强。肝组织出现典型的细胞免疫性病理损伤,术后7 d肝脏汇管区、肝实质、小静脉壁、胆管上皮内及小叶间胆管被大量的淋巴细胞及嗜中性粒细胞包绕及浸润,胆管上皮细胞内空泡形成、上皮细胞凋亡。病理改变明显比术后3 d严重;急性排斥组患者术后3 d和7 d外周血Th17细胞比例及血清中IL-17含量较稳定组和对照组均明显增多（P〈0.05）,且Th17细胞及IL-17在术后急性排斥期7 d值均明显高于3 d（P〈0.05）。结论 Th17细胞及IL-17在肝移植急性排斥反应的发生、发展中可能起着促进作用,外周血Th17细胞及IL-17的检测有可能成为肝移植急性排斥反应的早期诊断指标。     

特应性皮炎患儿外周血miR-122a和miR-146a水平与Th1/Th2/Th17免疫平衡的相关性分析

摘要 目的：探讨特应性皮炎（AD）患儿外周血微小核糖核酸（miRNA）-122a和miR-146a水平与辅助性T细胞（Th）1/Th2/Th17免疫平衡的相关性。方法：选取2020年5月～2023年5月石家庄市妇幼保健院皮肤科收治的AD患儿100例为AD组,根据特应性皮炎评分（SCORAD）分为轻度组31例、中度组41例、重度组28例,另选取同期100名体检健康儿童为对照组。采用实时荧光定量聚合酶链式反应检测外周血miR-122a、miR-146a水平,流式细胞术检测外周血Th1、Th2、Th17细胞比例,酶联免疫吸附法检测外周血Th1、Th2、Th17相关细胞因子[白细胞介素（IL）-2、干扰素-γ（IFN-γ）、IL-4、IL-13、IL-17、IL-22]水平,并计算Th1/Th2/Th17比值。采用Pearson/Spearman相关性分析AD患儿外周血miR-122a、miR-146a与Th1、Th2、Th17和相关细胞因子及Th1/Th2/Th17的相关性。结果：AD组外周血miR-122a、miR-146a、Th1、Th1/Th2/Th17、IL-2、IFN-γ水平低于对照组,Th2、Th17、IL-4、IL-13、IL-17、IL-22水平高于对照组（P均＜0.05）。轻度组、中度组、重度组外周血miR-122a、miR-146a、Th1、Th1/Th2/Th17、IL-2、IFN-γ水平依次降低,Th2、Th17、IL-4、IL-13、IL-17、IL-22水平依次升高（P均＜0.05）。Pearson/Spearman相关性分析显示,AD患儿外周血miR-122a、miR-146a与Th1、Th1/Th2/Th17、IL-2、IFN-γ水平呈正相关（r/rs分别为0.679、0.677、0.684、0.706、0.693、0.689、0.671、0.694,P均＜0.001）,与Th2、Th17、IL-4、IL-13、IL-17、IL-22呈负相关（r/rs分别为-0.690、-0.680、-0.681、-0.669、-0.675、-0.676、-0.676、-0.686、-0.682、-0.674、-0.680、-0.689,P均＜0.001）。结论：AD患儿外周血miR-122a、miR-146a水平降低,与病情严重程度密切相关,可能通过调节Th1/Th2/Th17免疫平衡参与AD发生发展。     

Th17细胞在肺部感染免疫中的作用

Th17细胞是近年来发现的一种新的效应T细胞亚群,在自身免疫性疾病和感染中发挥重要的作用,其分泌产生几种致炎细胞因子,包括新发现的细胞因子白细胞介素17。Th17产生的细胞因子与Th1、Th2不同并且与其相互对抗。Th17细胞很可能对防御胞外病原菌的感染及自身免疫性疾病产生影响。综述了Th17细胞产生的细胞因子及其在肺部感染免疫中的作用相关方面的进展。