T cell immunoglobulin and mucin domain 3 （Tim-3） is well known to negatively regulate T cells responses, but its role in burn-induced T cells immune suppression remains unclear. In the present study, in order to ide...T cell immunoglobulin and mucin domain 3 （Tim-3） is well known to negatively regulate T cells responses, but its role in burn-induced T cells immune suppression remains unclear. In the present study, in order to identify the relationship between Tim-3 expression and post-burn T cells immune suppression, C57BL/6 mice were subjected to burn injury or sham injury, and the liver and spleen were harvested at the day 1 after operation. The expression level of Tim-3 on hepatic or splenic T cells and the functional properties of Tim-3＋ T cells were evaluated. It was found burn injury induced dramatically elevated Tim-3 expression on both hepatic and splenic CD4＋ and CD8＋ T cells in contrast with the post-burn depletion of T cells. Furthermore, Tim-3 expression was correlated with the suppressive phenotype of T cells following burn injury, including increased expression of anti-inflammatory cytokine IL-10, decreased expression of pro-inflammatory cytokines IFN-γ and TNF-α, reduced T cell proliferation and elevated co-expression of Tim-3 and PD-1. Moreover, Tim-3＋ T cells subsets were more prone to spontaneous apoptosis than Tim-3- T cells subsets. Our findings reinforce the idea that the up-regulated expression of Tim-3 on T cells after burn injury plays an important role in the development and maintenance of burn-induced T cell immune suppression.展开更多
目的探讨EBV mi R-BART17-3p影响原发免疫性血小板减少症(ITP)患儿Treg/Th17平衡的机制。方法收集ITP患儿(ITP组,20例)和健康儿童(对照组,20例)外周血并分离CD_(4)^(+)T细胞。采用实时荧光定量聚合酶链式反应法、Western blot法、酶联...目的探讨EBV mi R-BART17-3p影响原发免疫性血小板减少症(ITP)患儿Treg/Th17平衡的机制。方法收集ITP患儿(ITP组,20例)和健康儿童(对照组,20例)外周血并分离CD_(4)^(+)T细胞。采用实时荧光定量聚合酶链式反应法、Western blot法、酶联免疫吸附法检测EBV mi R-BART17-3p、T细胞免疫球蛋白黏蛋白3(Tim-3)、叉头框蛋白P3(Fox P3)、白细胞介素17A(IL-17A)和转化生长因子-β(TGF-β)的m RNA、蛋白表达水平及含量。采用双荧光素酶报告基因实验考察EBV mi R-BART17-3p对Tim-3表达水平的影响。将15只BALB/C小鼠随机分为空白对照组、模型组、观察组,各5只。腹腔注射抗血小板抗体MWReg30以复制ITP小鼠模型,建模4 d后观察组小鼠予尾静脉注射携带EBV mi R-BART17-3p inhibitor的腺病毒载体。细胞染色并观察形态,检测外周血中TGF-β、IL-17A含量及血小板计数,采用流式细胞仪分别检测CD_(4)^(+)T细胞中Th17和Treg水平,并计算二者百分比。结果与对照组比较,ITP组患儿外周血EBV mi R-BART17-3p表达水平显著升高,Tim-3和TGF-βm RNA表达水平显著降低(P<0.05);Tim-3 m RNA表达水平与EBV mi R-BART17-3p表达水平呈显著负相关(r=-0.732,P<0.001)。Tim-3慢病毒载体p LKO.1-sh-Tim-3(sh-Tim-3)可显著降低Tim-3、Fox P3、TGF-β水平(P<0.05)。mi R-BART17-3p mimic显著升高了CD_(4)^(+)T细胞中mi R-BART17-3p的表达水平,并显著降低了Tim-3、Fox P3、TGF-βm RNA和蛋白表达水平(P<0.05);mi R-BART17-3p mimic可显著降低TGF-β含量,Tim-3+mi R-BART17-3p过表达逆转了mi R-BART17-3p mimic对TGF-β的抑制作用。动物实验结果显示,沉默EBV mi R-BART17-3p可促进Treg分化,减少脾脏和骨髓组织中的巨核细胞计数,并显著增加外周血中血小板计数。结论EBV mi R-BART17-3p可通过Fox P3/Tim-3途径调节ITP患儿Treg/Th17的免疫失衡。展开更多
应用单克隆抗体阻断PD-1、CTLA-4等免疫检查点已在肿瘤免疫治疗中取得了一定成效,但尚有部分患者对免疫检查点阻断剂疗效不佳,其机制可能为存在其他抑制性旁路。T细胞免疫球蛋白黏蛋白分子-3(T cell immunolobulin and mucin-containing...应用单克隆抗体阻断PD-1、CTLA-4等免疫检查点已在肿瘤免疫治疗中取得了一定成效,但尚有部分患者对免疫检查点阻断剂疗效不佳,其机制可能为存在其他抑制性旁路。T细胞免疫球蛋白黏蛋白分子-3(T cell immunolobulin and mucin-containing protein-3,TIM-3)是一种可表达于多种免疫细胞,并具有重要调控作用的免疫检查点分子。已有研究报道多种肿瘤外周血和肿瘤浸润性T细胞中存在TIM-3高表达,并与预后不良相关。抗肿瘤免疫中,高表达TIM-3的T细胞、DC及单核巨噬细胞,可抑制肿瘤免疫应答。临床前研究显示,抗TIM-3单抗联合抗PD-1单抗可发挥协同抗肿瘤效应。TIM-3单克隆抗体已进入临床试验阶段。然而,TIM-3在调控免疫细胞中的部分功能尚待阐明,进一步理解TIM-3的免疫调节机制有助于推动基于阻断TIM-3抗肿瘤免疫治疗的临床应用。展开更多
基金supported by grants from National Natural Science Foundation of China (No. 30700799, 81172803)Doctoral Fund of Ministry of Education of China (No. 20070487119)Natural Science Foundation of Hubei Province (No. 2007AD A201)
文摘T cell immunoglobulin and mucin domain 3 （Tim-3） is well known to negatively regulate T cells responses, but its role in burn-induced T cells immune suppression remains unclear. In the present study, in order to identify the relationship between Tim-3 expression and post-burn T cells immune suppression, C57BL/6 mice were subjected to burn injury or sham injury, and the liver and spleen were harvested at the day 1 after operation. The expression level of Tim-3 on hepatic or splenic T cells and the functional properties of Tim-3＋ T cells were evaluated. It was found burn injury induced dramatically elevated Tim-3 expression on both hepatic and splenic CD4＋ and CD8＋ T cells in contrast with the post-burn depletion of T cells. Furthermore, Tim-3 expression was correlated with the suppressive phenotype of T cells following burn injury, including increased expression of anti-inflammatory cytokine IL-10, decreased expression of pro-inflammatory cytokines IFN-γ and TNF-α, reduced T cell proliferation and elevated co-expression of Tim-3 and PD-1. Moreover, Tim-3＋ T cells subsets were more prone to spontaneous apoptosis than Tim-3- T cells subsets. Our findings reinforce the idea that the up-regulated expression of Tim-3 on T cells after burn injury plays an important role in the development and maintenance of burn-induced T cell immune suppression.
文摘目的探讨EBV mi R-BART17-3p影响原发免疫性血小板减少症(ITP)患儿Treg/Th17平衡的机制。方法收集ITP患儿(ITP组,20例)和健康儿童(对照组,20例)外周血并分离CD_(4)^(+)T细胞。采用实时荧光定量聚合酶链式反应法、Western blot法、酶联免疫吸附法检测EBV mi R-BART17-3p、T细胞免疫球蛋白黏蛋白3(Tim-3)、叉头框蛋白P3(Fox P3)、白细胞介素17A(IL-17A)和转化生长因子-β(TGF-β)的m RNA、蛋白表达水平及含量。采用双荧光素酶报告基因实验考察EBV mi R-BART17-3p对Tim-3表达水平的影响。将15只BALB/C小鼠随机分为空白对照组、模型组、观察组,各5只。腹腔注射抗血小板抗体MWReg30以复制ITP小鼠模型,建模4 d后观察组小鼠予尾静脉注射携带EBV mi R-BART17-3p inhibitor的腺病毒载体。细胞染色并观察形态,检测外周血中TGF-β、IL-17A含量及血小板计数,采用流式细胞仪分别检测CD_(4)^(+)T细胞中Th17和Treg水平,并计算二者百分比。结果与对照组比较,ITP组患儿外周血EBV mi R-BART17-3p表达水平显著升高,Tim-3和TGF-βm RNA表达水平显著降低(P<0.05);Tim-3 m RNA表达水平与EBV mi R-BART17-3p表达水平呈显著负相关(r=-0.732,P<0.001)。Tim-3慢病毒载体p LKO.1-sh-Tim-3(sh-Tim-3)可显著降低Tim-3、Fox P3、TGF-β水平(P<0.05)。mi R-BART17-3p mimic显著升高了CD_(4)^(+)T细胞中mi R-BART17-3p的表达水平,并显著降低了Tim-3、Fox P3、TGF-βm RNA和蛋白表达水平(P<0.05);mi R-BART17-3p mimic可显著降低TGF-β含量,Tim-3+mi R-BART17-3p过表达逆转了mi R-BART17-3p mimic对TGF-β的抑制作用。动物实验结果显示,沉默EBV mi R-BART17-3p可促进Treg分化,减少脾脏和骨髓组织中的巨核细胞计数,并显著增加外周血中血小板计数。结论EBV mi R-BART17-3p可通过Fox P3/Tim-3途径调节ITP患儿Treg/Th17的免疫失衡。
文摘目的 研究T细胞免疫球蛋白黏蛋白3(TIM-3)及乳腺癌易感基因相关蛋白1(BAP1)、泛素特异性蛋白酶39(USP39)与早期胃癌免疫浸润的关系。方法 选取2019年4月至2021年12月于我院行内镜下黏膜剥离术(ESD)治疗的87例早期胃癌患者,收集其术后病理组织及其癌旁组织;采用免疫组织化学法检测组织TIM-3、BAP1、USP39及CD3^(+)、CD4^(+)、CD8^(+)、CD68^(+)阳性表达,实时荧光定量PCR法检测其mRNA表达;采用Spearman法分析相关性;并比较TIM-3、BAP1、USP39阳性表达的病理参数,随访统计阴阳性表达者生存时间,COX回归分析影响预后的危险因素。结果 TIM-3、BAP1、USP39在胃癌组织中阳性表达率高于癌旁组织(P<0.05)。胃癌组织TIM-3 m RNA、BAP1 m RNA、USP39 mRNA表达量高于癌旁组织(P<0.05)。胃癌组织中CD3^(+)、CD4^(+)阳性率高于癌旁组织,CD8^(+)、CD68^(+)阳性表达率低于癌旁组织(P<0.05)。TIM-3、BAP1、USP39阳性表达在年龄、性别方面,无统计学意义(P>0.05);在分化程度、淋巴结转移方面,具有统计学意义(P<0.05)。经Spearman分析显示,TIM-3、BAP1、USP39表达与CD3^(+)、CD4^(+)浸润量呈正相关(P<0.05),与CD8^(+)、CD68^(+)浸润量呈负相关(P<0.05)。术后随访1年,TIM-3、BAP1、USP39阳性表达者生存率分别为75.68%(56/74)、73.33%(44/60)、71.43%(40/56),阴性表达者分别为100.00%(13/13)、92.59%(25/27)、93.55%(29/31);阴阳性表达患者生存率差异有统计学意义(P<0.05)。经COX多因素分析显示,分化程度对胃癌预后无显著影响(P>0.05),淋巴结转移、TIM-3、BAP1、USP39阳性表达为影响预后的危险因素(P<0.05)。结论 TIM-3、BAP1、USP39在胃癌组织中阳性表达率高,其表达与组织免疫浸润有关,且TIM-3、BAP1、USP39阳性表达者预后差。
