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1.

Background

Myositis is a heterogeneous group of muscular auto-immune diseases with clinical and pathological criteria that allow the classification of patients into different sub-groups. Inclusion body myositis is the most frequent myositis above fifty years of age. Diagnosing inclusion body myositis requires expertise and is challenging. Little is known concerning the pathogenic mechanisms of this disease in which conventional suppressive-immune therapies are inefficacious.

Objectives

Our aim was to deepen our understanding of the immune mechanisms involved in inclusion body myositis and identify specific biomarkers.

Methods

Using a panel of thirty-six markers and mass cytometry, we performed deep immune profiling of peripheral blood cells from inclusion body myositis patients and healthy donors, divided into two cohorts: test and validation cohorts. Potential biomarkers were compared to myositis controls (anti-Jo1-, anti-3-hydroxyl-3-methylglutaryl CoA reductase-, and anti-signal recognition particle-positive patients).

Results

Unsupervised analyses revealed substantial changes only within CD8+ cells. We observed an increase in the frequency of CD8+ cells that expressed high levels of T-bet, and containing mainly both effector and terminally differentiated memory cells. The senescent marker CD57 was overexpressed in CD8+T-bet+ cells of inclusion body myositis patients. As expected, senescent CD8+T-bet+ CD57+ cells of both patients and healthy donors were CD28nullCD27nullCD127null. Surprisingly, non-senescent CD8+T-bet+ CD57- cells in inclusion body myositis patients expressed lower levels of CD28, CD27, and CD127, and expressed higher levels of CD38 and HLA-DR compared to healthy donors. Using classification and regression trees alongside receiver operating characteristics curves, we identified and validated a frequency of CD8+T-bet+ cells >51.5% as a diagnostic biomarker specific to inclusion body myositis, compared to myositis control patients, with a sensitivity of 94.4%, a specificity of 88.5%, and an area under the curve of 0.97.

Conclusion

Using a panel of thirty-six markers by mass cytometry, we identify an activated cell population (CD8+T-bet+ CD57- CD28lowCD27lowCD127low CD38+ HLA-DR+) which could play a role in the physiopathology of inclusion body myositis, and identify CD8+T-bet+ cells as a predominant biomarker of this disease.  相似文献   
2.
目的探讨静脉应用T-bet重组腺病毒(AdT-bet)对哮喘模型小鼠过敏性气道炎症及Th1/Th2免疫失衡的影响。方法36只C57BL/6小鼠随机分为AdT-bet治疗组(A组)、模型对照组(B组)、正常组(C组)。以卵蛋白(OVA)、氢氧化铝免疫建立哮喘模型,A组激发前尾静脉注射100μL的AdT-bet(1×10^8 PFU/μL),各组激发后肺泡灌洗分析细胞组份,分离肺淋巴细胞测定细胞因子分泌水平,以流式细胞仪检测CD3^+、CD4^+ T细胞比例及表达IFNγ和IL-4的比例,比较各组肺组织学改变。结果静脉应用AdT-bet组与对照组相比:①可明显抑制抗原激发后气道内嗜酸性粒细胞的浸润(P〈0.01);②明显抑制肺淋巴细胞产生IL-4、IL-5,增加了IFNγ的产生;③肺脏淋巴细胞CD4^+ IFNγ百分比及IFNγ^+/IL-4^+明显升高(P〈0.01),而CD4^+ IL-4^+百分比则明显下降;④明显抑制哮喘鼠气道内及肺泡内的过敏性炎症反应。结论激发前静脉用AdT-bet对哮喘小鼠过敏性气道炎症有明显的防治作用,其机制可能与表达的T-bet上调Th1/Th2比值,从而调整了免疫平衡有关。  相似文献   
3.
4.
There is increasing evidence that IFNg plays a major role in both induction of Tregs as well as immunosuppression mediated by IFNg-producing Tregs. The present review focuses on a small subset of iTregs that produces IFNg, comprises only 0.04% of all CD4+ T lymphocytes in the blood of healthy individuals, and increases strongly during an immune response. IFNg+ Tregs are induced by IFNg and IL12, making them sensors for inflammatory cytokines. They develop rapidly during inflammation and represent the first line of Tregs that suppress initial immune responses. The pool of IFNg+ Tregs consists of activated stable immunosuppressive thymus-derived nTregs as well as peripherally proliferating iTregs with in part only transient immunosuppressive function, which limits their diagnostic and therapeutic usefulness in organ transplantation. Apparently, a part of IFNg+ Tregs dies during the immune response, whereas others, after efficient immunosuppression with resolution of the immune response, differentiate toward Th1 lymphocytes. Goals of further research are the development of appropriate diagnostic tests for rapid and exact determinination of immunosuppressive IFNg+ iTregs, as well as the induction and propagation of stable immunosuppressive IFNg+ Tregs that establish and maintain good long-term graft function in transplant recipients.  相似文献   
5.
 目的: 研究川崎病患儿细胞免疫功能状况及转录因子T-bet和GATA3的调控作用。方法: 选取41 例川崎病患儿为研究对象,同时选取年龄和性别相匹配的因急性上呼吸道感染发热儿童40例为对照组,分别采用三色荧光流式细胞术和半定量逆转录-聚合酶链反应检测2组患儿外周血Th1、Th2细胞数量及单个核细胞中T-bet和GATA3 mRNA水平。结果: 川崎病患儿外周血Th1、Th2细胞比率及单个核细胞转录因子T-bet mRNA、GATA3 mRNA转录水平分别为(10.36±3.69)%、(6.46±2.28)%、0.51±0.16和0.38±0.13,均显著低于对照组[(25.26±5.22)%、(16.87±4.35)%、0.62±0.21和0.46±0.12,P<0.05]。Spearman相关分析显示Th1和Th2细胞比率分别与T-bet mRNA和GATA3 mRNA水平呈正相关。结论: 川崎病患儿急性期T细胞并非活化而是处于抑制状态,T-bet和GATA3分别对Th1和Th2细胞增殖具有调控作用。  相似文献   
6.
目的 探讨支气管哮喘(哮喘)小鼠肺组织T-bet mRNA与黏蛋白基因Muc5ac蛋白的表达及两者的相关性.方法 制作小鼠哮喘模型,应用RT-PCR法测定哮喘组及对照组肺组织T-bet mRNA的表达,分别用免疫组织化学法和阿辛蓝过碘酸雪夫染色法测定两组气道Muc5ac蛋白和黏蛋白的表达.结果 哮喘组小鼠肺组织T-bet mRNA的表达较止常组明显减低[(0.954±0.07)vs.(0.48±0.10),(P<0.01)].哮喘组小鼠气道黏蛋白基因Muc5ac蛋门的表达较对照组明显增高[(43.24±5.82)VS.(89.12±5.56),(P<0.01)].哮喘组小鼠肺组织T-bet mRNA与气道Muc5ac蛋白呈线性负相关(P<0.05).结论 哮喘小鼠肺组织T-bet mRNA表达减少是可能促进了气道Muc5ac蛋白的表达.从而促进了气道黏液过度分泌.  相似文献   
7.
目的:观察抑制性寡脱氧核苷酸对小鼠脾脏CD4^+T细胞Th1分化的影响。方法:分离小鼠脾脏淋巴细胞,以免疫磁珠阳性选择法纯化CD4^+T细胞,以荧光活化细胞分拣术分析其分选纯度,在抗-CD3ε抗体、抗-CD28抗体和IL-12作用下,加入抑制性寡脱氧核苷酸或对照寡脱氧核苷酸培养72h后,用ELISA检测上清IFN-γ和IL-4的分泌,用RT-PCR检测细胞r—bet mRNA的表达。结果:抑制性寡脱氧核苷酸能明显抑制CD4^+T细胞IFN-γ的分泌,促进IL-4的分泌,同时还抑制T-bet mRNA的表达。结论:在促Th1细胞因子刺激下,抑制性寡脱氧核苷酸对小鼠体外CD4^+T细胞的功能性分化有作用,既促进Th2分化,又抑制Th1分化。  相似文献   
8.
目的 探讨原花青素对斑秃患者外周血单核细胞(PBMC)中Th1型细胞因子(IFN γ、IL 12)及转录因子T-bet 基因表达的调节作用。 方法 用逆转录-聚合酶链反应(RT PCR) 法,分别检测8例轻型斑秃、12例重型斑秃患者及10例健康人外周血PBMC 经原花青素(PC)刺激后IFN-γ、IL-12及T-bet mRNA的表达状况。 结果 植物血凝素(phytoaemagglutinin, PHA)及PC+PHA共同刺激重型斑秃患者PBMC后,转录因子T bet mRNA分别为0.581±0.148、0.419±0.113;IFN-γmRNA分别为0.689±0.219、0.430±0.162;IL-12 mRNA分别为0.198±0.056、0.136±0.035;与自身对照比较,差异均有统计学意义(P<0.05)。 结论 PC可抑制重型斑秃患者PBMC中转录因子T bet及Th1型细胞因子基因表达,逆转Th1型反应,含PC的中药松针治疗斑秃有效的机制可能部分与此相关。  相似文献   
9.
王立新  张彤  刘秀婵  王毅 《天津中医药》2021,38(8):1071-1076
[目的] 考察雷公藤甲素(TP)对类风湿关节炎(RA)患者外周血单个核细胞(PBMC)中转录因子T-bet/GATA3和趋化因子(CXCL)10及CXCL受体3(CXCR3)表达的影响。[方法] 使用L929细胞考察TP的细胞毒性,确定实验药物浓度。CCK-8法检测TP对RA患者PBMC细胞增殖活性的影响,流式细胞仪分析TP对PBMC中Th细胞亚群比例及CXCR3受体表达调节,Luminex技术检测RA患者PBMC分泌干扰素-γ(IFN-γ)、白细胞介素(IL)-17/IL-17A、肿瘤坏死因子-α(TNF-α)、IL-4、IL-6、IL-10及CXCL10的表达水平。实时荧光定量聚合酶链反应(RT-qPCR)法分析T-bet、GATA3、CXCL10及CXCR3的mRNA表达水平。[结果] 当TP浓度<25 nmol/L,培养时间为48 h时,TP对L929没有显著的细胞毒性(P>0.05)。在此浓度范围内,当TP浓度为5 nmol/L时即表现出对PBMC细胞增殖具有显著抑制作用(P<0.05)。Th、Th1细胞亚群比例以及CXCR3受体表达均受到TP抑制(P<0.05),但对Th2细胞亚群比例没有显著调节作用(P>0.05)。抗炎因子IL-4、IL-10,促炎因子IFN-γ、IL-6、TNF-α、IL-17/IL-17A,以及CXCL10表达均显著降低(P<0.05)。RT-qPCR结果显示,仅CXCL10表达显著降低,T-bet、GATA3以及CXCR3表达无显著变化(P>0.05)。[结论] TP对Th1细胞增殖及其相关细胞因子具有抑制作用,并且能显著降低CXCL10及CXCR3的表达,但未观察到对T-bet、GATA3表达的调节作用。  相似文献   
10.
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