miR-133b 靶向 PTBP1 对肾细胞癌增殖和侵袭的影响

目的 探讨 miR-133b 靶向多聚嘧啶区结合蛋白1 (polyrimidine tract binding protein 1, PTBP1) 对 肾细胞癌 (renal cell carcinoma, RCC) 增殖和侵袭的影响。 方法 检测 miR-133b 在 RCC 癌组织及细胞中 的表达水平; 验证 miR-133b 与 PTBP1 的靶向关系及 miR-133b 表达对肾癌细胞 PTBP1 表达及增殖、 迁移的 影响。 结果 与癌旁组织比较, miR-133b 在 RCC 组织中表达下降, 而 PTBP1 上升 (P< 0. 05)。 PTBP1 是 miR-133b 的靶基因; 与 miR-NC 组比较, miR-133b mimic 组的克隆形成率、 侵袭细胞数目及 PTBP1 表达明 显下降, 而 miR-133b inhibitor 组上升; 与 miR-133b mimic + pc-NC 组比较, miR-133b mimic + pc-PTBP1 组的 克隆形成率、 侵袭细胞数目及 PTBP1 表达水平上升 (P< 0. 05)。 结论 miR-133b 在 RCC 癌组织及细胞中 表达下调, 且其可能通过调控 PTBP1 的表达水平来影响细胞的增殖和侵袭能力。     

miR-133靶向NLRP3对小鼠Kupffer细胞炎性活化的影响

目的:探究微小RNA-133(miR-133)靶向核苷酸结合寡聚化结构域样受体蛋白3(NLRP3)对小鼠库普弗(Kupffer)细胞(KCs)炎症活化的影响。方法:从小鼠肝脏中分离KCs并鉴定。鉴定成功后用1 mg/L脂多糖(LPS)诱导KCs,并分别转染miR-133 inhibitor和miR-133 mimic。采用RT-qPCR检测细胞中miR-133和NLRP3的mRNA水平;ELISA法检测细胞培养液中白细胞介素1β(IL-1β)和肿瘤坏死因子α(TNF-α)水平;Western blot实验检测细胞中NLRP3、含胱天蛋白酶募集结构域的凋亡相关斑点样蛋白(ASC)和胱天蛋白酶1(caspase-1)蛋白水平;TargetScan查找NLRP3 mRNA的3’UTR与miR-133的结合位点,并经双萤光素酶报告基因检测试剂盒鉴定。结果:72 h时KCs体积较24 h时大,边界清晰,形态基本稳定;碳素墨水实验观察到细胞中有大量黑色颗粒,证明该细胞有较强的吞噬能力,为KCs。1 mg/L LPS诱导后KCs中miR-133水平降低,NLRP3 mRNA和蛋白、caspase-1...     

镁对哮喘患者外周血CD4+ CD25+调节性T细胞凋亡及Foxp3表达的影响

目的:观察镁对分离培养的健康人和哮喘患者外周血CD4⁺CD25⁺调节性T细胞凋亡及叉头框蛋白3(Foxp3)表达的影响。方法:经磁珠分离法分离出健康人和哮喘患者外周血CD4⁺CD25⁺T细胞,分镁剂干预组(10 mmol/L)及空白组培养72 h后,用流式细胞仪检测CD4⁺CD25⁺T细胞的凋亡率及Foxp3表达情况。结果:(1)健康人外周血CD4⁺CD25⁺T细胞的纯度为77.4％~92.3%,哮喘患者CD4⁺CD25⁺T细胞的纯度为75.2％~93.8％。(2)CD4⁺CD25⁺T细胞占外周血CD4⁺T细胞的比例在健康组为4.12%~7.98%,在哮喘组为4.51%~8.68%,两者没有显著差异(P＞0.05)。(3)镁(10mmol/L)可以诱导健康组及哮喘组外周血CD4⁺CD25⁺T细胞凋亡率增加(P＜0.05),但对Foxp3的表达无影响(P＞0.05)。结论:镁促进CD4⁺CD25⁺T调节细胞凋亡增加可能为其治疗支气管哮喘的作用机制之一。     

miR-433-3p靶向HP1BP3抑制胃癌细胞的增殖、迁移和侵袭能力

目的：探究微小RNA-433-3p(miR-433-3p)对胃癌细胞增殖、迁移和侵袭的影响,以及miR-433-3p靶向异染色质蛋白1结合蛋白3(HP1BP3)对胃癌细胞的调控作用。方法：将人胃癌细胞系HGC-27和AGS分为阴性对照（NC）mimic组、miR-433-3p mimic组、NC siRNA (si-NC)组和HP1BP3 siRNA (si-HP1BP3)组,分别转染NC mimic、miR-433-3p mimic、si-NC和si-HP1BP3。RT-qPCR检测miR-433-3p在HGC-27和AGS细胞中的表达;CCK-8法和细胞集落形成实验检测细胞增殖;划痕愈合实验检测细胞迁移;Traswell实验检测细胞侵袭;Western blot检测HP1BP3蛋白表达。结果：与NC mimic组相比,miR-433-3p mimic组HGC-27和AGS细胞中miR-433-3p表达升高。过表达miR-433-3p抑制HGC-27和AGS细胞的增殖、迁移和侵袭,抑制HP1BP3蛋白表达;敲减HP1BP3抑制HGC-27和AGS细胞的增殖和迁移。结论：miR-433...     

针刺对胚胎着床障碍大鼠CD4+CD25+Foxp3+调节性T细胞的影响

 目的：观察针刺对胚胎着床障碍大鼠CD4+CD25+Foxp3+Treg细胞的影响。方法：144只孕鼠随机分为对照组（N）、米非司酮组（M）、米非司酮+针刺组（A）和米非司酮+黄体酮组（W）,每组随机再分为6 d组、8 d组和10 d组。其中M组、A组和W组妊娠1 d给予米非司酮-麻油溶液造模,N组则给予等量麻油溶液。同时,每天下午A组固定并行针刺三阴交和后三里,N组和M组仅固定,W组肌肉注射黄体酮,直到处死当天结束。统计孕鼠胚胎着床数,用流式细胞术检测外周血CD4+CD25+Foxp3+Treg细胞和子宫内膜的CD4+Foxp3+Treg细胞的比例,Western blotting和real-time PCR测定着床点的子宫内膜Foxp3的表达。结果：与N组相比,M组的着床胚胎数、外周血CD4+CD25+Foxp3+Treg细胞和子宫内膜CD4+Foxp3+Treg细胞的比例、着床点子宫内膜Foxp3蛋白和mRNA的表达均明显下降（P<005）;与M组相比,A组和W组的着床胚胎数、外周血CD4+CD25+Foxp3+Treg细胞和子宫内膜CD4+Foxp3+Treg细胞的比例以及着床点子宫内膜Foxp3蛋白和mRNA的表达均有不同程度地升高。结论: 针刺改善胚胎着床障碍大鼠的胚胎着床可能与CD4+CD25+Foxp3+Treg细胞的调节密切相关。     

miR-301a-3p对大鼠星形胶质细胞Cx43转录后的靶向调控作用

目的:研究大鼠星形胶质细胞中微小RNA-301a-3p(miR-301a-3p)对缝隙连接蛋白43(Cx43)表达的靶向调控作用及其作用位点。方法:合成miR-301a-3p agomir和miR-301a-3p antagomir,转染至星形胶质细胞,Western blot检测各组细胞中Cx43蛋白的表达情况;构建重组载体wt-pEZX-MT05-Cx43和mut-pEZX-MT05-Cx43,采用双萤光素酶报告基因实验验证miR-301a-3p的靶基因;构建表达载体pcDNA3.1-Cx43,通过回复实验分析miR-301a-3p对细胞凋亡的影响。结果:将miR-301a-3p agomir转染到星形胶质细胞后,Western blot检测显示,与对照组相比,Cx43蛋白表达显著降低(P<0.05)。双萤光素酶报告基因实验结果表明,miR-301a-3p能够与Cx43的3′-UTR结合,对其表达产生负调控;将不含Cx43 3′-UTR的重组载体pcDNA3.1-Cx43转染星形胶质细胞后,能够回复miR-301a-3p对Cx43蛋白表达的负调控作用,引起细胞凋亡。结论:Cx...     

输血相关急性肺损伤患者外周血CD4＋CD25highFoxp3＋调节性T淋巴细胞变化的临床意义

目的检测输血相关急性肺损伤（TRALI）患者外周血CD4＋CD25highFoxp3＋调节性T淋巴细胞（Treg）的计数及其功能基因又头框蛋白3（Foxp3）mRNA的表达水平,以及探讨其与疾病预后的关系。方法收集2008年6月至2011年11月期间健康体检者（对照组,n=30）和重症监护病房收治的TRALI患者[TRALI组,n=26,TRALI组按预后又分为死亡组（n=5）和存活组（n=21）]外周抗凝血,采用流式细胞术分析各组T细胞亚群。采用四色流式细胞术以Foxp3-FITC／CD25-PE／CD4-PerCP／CD3-PC7抗体组合检测各组受试者外周血CD4＋CD25highFoxp3＋Treg的计数,比较死亡组和存活组患者外周血CD4＋CD25highFoxp3＋Treg的水平。实时荧光定量PCR技术检测特异性转录因子Foxp3mRNA的表达水平,并分析患者外周血CD4＋CD25highFoxp3＋Treg的比例与Foxp3mRNA的表达水平的关系。结果TRALI患者与对照组健康人间CD3＋T细胞、CD3＋CD4＋T细胞计数的差异无统计学意义,而CD3＋CD8＋T细胞则较对照组增加（P〈0．05）,CD4＋／CD8＋比值降低（P〈0．05）。死亡组CD3＋CD8＋T细胞比例高于存活组（P〈0．05）,C133＋T细胞、CD3＋CD4＋T细胞比例和CD4＋／CD8＋比值则低于存活组（均P〈0．05）。TRALI患者外周血CD4＋CD2.5high Foxp3＋Treg计数为（8．86±3．14）％,明显高于健康对照组（5．67±2．43）％（P〈0．05）。TRALI死亡组患者外周血CD4＋CD2shighFoxp3＋Treg计数为（11．23±3．79）％,显著高于存活组患者（7．69±3．21）％（P〈0．05）。TRALI患者外周血Foxp3mRNA的表达水平为（3．77±2．73）×10^5拷贝/ug,显著高于对照组（0．43±0．21）×10^5拷贝／μg（P〈0．05）。TRALI患者外周血CD4＋CD25highFoxp3＋Treg计数与Foxp3mRNA的表达水平呈正相关（r=0．5131,P〈0．05）。结论TRAM患者外周血CD4＋CD.5highFoxp3＋Treg和Foxp3mRNA的变化可能是导致TRALI疾病发展的关键因素之一,与?     

miR-92a与miR-19b对小鼠胰岛β细胞胰岛素基因表达的影响

目的:探讨微小RNA-92a(miR-92a)和微小RNA-19b(miR-19b)对小鼠胰岛β细胞胰岛素基因表达的影响。方法:qPCR检测小鼠胰岛素瘤MIN6细胞内源性miR-92a和miR-19b的相对表达水平。将MIN6细胞分为对照组及实验Ⅰ、Ⅱ组(每组n=3),分别转染阴性对照miRNA(NC)、miR-92a和miR-19b,qPCR验证miRNAs的过表达,光学显微镜观察细胞形态,CCK8法检测细胞活力,qPCR、Western blot及免疫荧光检测胰岛素表达情况,生物信息学预测、双萤光素酶报告基因实验和Western blot分析miR-92a和miR-19b调控胰岛素表达的可能机制。结果:与成体胰腺祖细胞相比,MIN6细胞内源性miR-92a和miR-19b相对表达量显著降低(P<0.05);过表达miR-92a和miR-19b对MIN6细胞活力没有影响,但抑制胰岛素mRNA和蛋白表达;miR-19b显著抑制NeuroD1 3’UTR萤光素酶活性和NeuroD1蛋白表达(P<0.05),而miR-92a对NeuroD1 3’UTR萤光素酶活性和NeuroD...     

重症肌无力患者血清miR-126、Foxp3 mRNA的表达及临床意义

为探讨重症肌无力(myasthenia gravis,MG)患者血清miR-126、叉头翼状螺旋转录因子3(forkhead box P3,Foxp3)mRNA的表达及临床意义,为MG发病机制研究提供更多的依据,选择63例MG患者为MG组,50例体检正常者为对照组。采用RT-PCR检测血清miR-126、Foxp3 mRNA的表达水平,并采用Spearman相关性分析法分析miR-126与Foxp3 mRNA的相关性。结果显示,MG组患者血清miR-126的相对表达量(2.59±0.84)高于对照组(1.05±0.73,P0.01),而Foxp3 mRNA的相对表达量(1.58±0.81)低于对照组(3.15±0.96,P0.01);miR-126核苷酸序列在人、小鼠、狗等7个物种间存在高度保守性;MG组患者血清miR-126与Foxp3 mRNA呈负相关(r=-0.852,P0.01)。提示MG患者存在miR-126及Foxp3 mRNA的差异表达,且高表达的miR-126可能通过抑制Foxp3 mRNA的表达参与MG的致病。     

Functional type 1 regulatory T cells develop regardless of FOXP3 mutations in patients with IPEX syndrome

Mutations of forkhead box p3 (FOXP3), the master gene for naturally occurring regulatory T cells (nTregs), are responsible for the impaired function of nTregs, resulting in an autoimmune disease known as the immune dysregulation, polyendocrinopathy, enteropathy, X-linked (IPEX) syndrome. The relevance of other peripheral tolerance mechanisms, such as the presence and function of type 1 regulatory T (Tr1) cells, the major adaptive IL-10-producing Treg subset, in patients with IPEX syndrome remains to be clarified. FOXP3(mutated) Tr1-polarized cells, differentiated in vitro from CD4(+) T cells of four IPEX patients, were enriched in IL-10(+) IL-4(-) IFN-γ(+) T cells, a cytokine production profile specific for Tr1 cells, and expressed low levels of FOXP3 and high levels of Granzyme-B. IPEX Tr1 cells were hypoproliferative and suppressive, thus indicating that FOXP3 mutations did not impair their function. Furthermore, we isolated Tr1 cell clones from the peripheral blood of one FOXP3(null) patient, demonstrating that Tr1 cells are present in vivo and they can be expanded in vitro in the absence of WT FOXP3. Overall, our results (i) show that functional Tr1 cells differentiate independently of FOXP3, (ii) confirm that human Tr1 and nTregs are distinct T-cell lineages, and (iii) suggest that under favorable conditions Tr1 cells could exert regulatory functions in IPEX patients.     

Developmental changes of FOXP3-expressing CD4+CD25+ regulatory T cells and their impairment in patients with FOXP3 gene mutations

FOXP3 is required for the generation and function of CD4(+)CD25(+) regulatory T (Treg) cells. To elucidate the biological role of Treg cells, we used a monoclonal anti-FOXP3 antibody to examine the frequencies of Treg cells during child development. The percentages of CD4(+)CD25(+)FOXP3(+) T cells were constant shortly from after birth through adulthood. CD4(+)CD25(+)FOXP3(+) T cells in cord blood showed the naive CD45RA(+)CD45RO(-) phenotype, whereas adult CD4(+)CD25(+)FOXP3(+) T cells expressed mostly the memory CD45RA(-)CD45RO(+) phenotype. The age-dependent dominance of memory CD4(+)CD25(+)FOXP3(+) T cells implies functional differences between naive and memory Treg cells. Notably, four patients with FOXP3 gene mutations revealed a paucity of CD4(+)CD25(+)FOXP3(+) T cells. Importantly, one patient with a frame shift mutation, who showed typical symptoms of IPEX (immune dysregulation, polyendocrinopathy, enteropathy, X-linked), exhibited marked T cell activation, whereas others with missense mutations, who were clinically milder, did not. This observation suggests a possible genotype-phenotype correlation in IPEX.     

miR-133b has protective effect on rats with acute lung injury caused by severe acute pancreatitis through targeting sp1 gene

Objective: We aimed to investigate the regulatory mechanism of miR-133b and Sp1 in rats with severe acute pancreatitis complicated by acute lung injury. Methods: The rats were divided into normal, NC, model, si-Sp1, miR-133b mimic, miR-133b inhibitor, and miR-133b inhibitor + si-Sp1 group and received different treatments. Results: Compared with normal mice, model mice had a lower miR-133b expression, but higher levels of Sp1 expression, W/D of lung tissue, myeloperoxidase activities, and higher levels of interleukin(IL)-6, tumor necrosis factor (TNF)-α and IL-1β, cell apoptosis rate and Notch-1, and Hes-1, nuclear factor (NF)-κB P65 expressions in lung tissue. Compared with model mice, mice in the si-Sp1 group and the miR-133b mimic group had significantly lower W/D of lung tissue, myeloperoxidase activities, lower levels of IL-6, TNF-α and IL-1β, cell apoptosis rate and Notch-1, Hes-1, and NF-κB P65 expressions in lung tissue. Mice treated by miR-133b inhibitor showed opposite results in all above parameters, which were similar with those in the model group. The negative effects of miR-133b inhibitor could be reversed by the combination use of si-Sp1. Conclusion: Overexpression of miR-133b could inhibit Sp1 expression, thereby improving severe acute pancreatitis in rats and playing a protective role in acute lung injury.     

成人隐匿性自身免疫糖尿病与调节性T细胞及相关基因Foxp3表达关系

目的探讨成人隐匿性自身免疫糖尿病与调节性T细胞(Treg)及相关基因Foxp3表达关系。方法采集LADA组、T1DM组、T2DM组和正常对照组新鲜外周血,密度梯度分离单个核细胞,流式细胞术检测4组CD3、CD4、CD25 T淋巴细胞亚群数量,计算Treg数量,RT-PCR检测转录因子Foxp3 mRNA的表达水平。结果 LADA组和T1DM组外周血CD4+T细胞明显高于T2DM组和正常对照组(P<0.05)。LADA组外周血Treg细胞高于T1DM组(P>0.05),明显低于T2DM组和正常对照组(P<0.05)。T1DM组外周血Treg细胞明显低于T2DM组和正常对照组(P<0.01),T2DM组和正常对照组之间无统计学差异(P>0.05)。LADA组Foxp3 mRNA明显高于T1DM组(P<0.05),明显低于T2DM组和正常对照组(P<0.05)。T1DM组Foxp3 mRNA明显低于T2DM组和正常对照组(P<0.01),T2DM组和正常对照组之间无明显统计学差异(P<0.05)。结论 LADA患者Treg细胞数量和活性降低,可能是其发病机制之一。     

IPEX, FOXP3 and regulatory T-cells: a model for autoimmunity

FOXP3 is the key mediator of regulatory T-cell development in the thymus. Naturally occurring mutations of FOXP3 interfere with this process, resulting in the generation of autoaggressive lymphocyte clones that are directly responsible for the syndrome Immune Dysregulation, Polyendocrinopathy, Enteropathy, X-Linked (IPEX) in humans and scurfy in mice. Stem cell transplantation is the only cure for IPEX patients. The study of this rare disease has provided important insight into the mechanisms of immunosuppression, autoimmunity and tolerance and future studies may lead to novel strategies to treat not only patients with IPEX, but also those suffering from autoimmunity, graft-versus-host disease or cancer. Presented at the First Robert A Good Society Symposium, St. Petersburg, FL 2006.     

γδ T cells restrain extrathymic development of Foxp3+‐inducible regulatory T cells via IFN‐γ

Inducible Treg (iTreg) cells generated from Ag‐stimulated naïve CD4⁺ T cells in the periphery play an important role in regulating immune responses. TGF‐β is a key cytokine that promotes this conversion process; however, how this process is regulated in vivo remains unclear. Here, we report that γδ T cells play a crucial role in controlling iTreg generation and suppressor function. Ag‐induced iTreg generation was significantly enhanced in C57BL/6 mice in the absence of γδ T cells. Inhibition of iTreg conversion was mediated by IFN‐γ produced by activated γδ T cells but not by activated CD4⁺ T cells. BM chimera experiments further confirmed γδ‐derived IFN‐γ‐dependent mechanism in regulating iTreg generation in vivo. Lastly, human peripheral blood γδ T cells also interfere with iTreg conversion via IFN‐γ. Our results suggest a novel function of γδ T cells in limiting the generation of iTreg cells, potentially balancing immunity and tolerance.     

PDCD5 negatively regulates autoimmunity by upregulating FOXP3+ regulatory T cells and suppressing Th17 and Th1 responses

Maintenance of FOXP3 protein expression is crucial for differentiation and maturation of regulatory T (Treg) cells, which play important roles in immune homeostasis and immune tolerance. We demonstrate here that PDCD5 interacts with FOXP3, increases acetylation of FOXP3 in synergy with Tip60 and enhances the repressive function of FOXP3. In PDCD5 transgenic (PDCD5tg) mice, overexpression of PDCD5 enhanced the level of FOXP3 protein and percentage of CD4⁺CD25⁺FOXP3⁺ cells. Naïve CD4⁺ T cells from PDCD5tg mice were more sensitive to TGF-β-induced Treg polarization and expansion. These induced Tregs retained normal suppressive function in vitro. Severity of experimentally-induced autoimmune encephalomyelitis (EAE) in PDCD5tg mice was significantly reduced relative to that of wild-type mice. The beneficial effect of PDCD5 likely resulted from increases of Treg cell frequency, accompanied by a reduction of the predominant pathogenic Th17/Th1 response. Activation-induced cell death enhanced by PDCD5 was also linked to this process. This is the first report revealing that PDCD5 activity in T cells suppresses autoimmunity by modulating Tregs. This study suggests that PDCD5 serves as a guardian of immunological functions and that the PDCD5-FOXP3-Treg axis may be a therapeutic target for autoimmunity.     

PD1 and PDL1 molecules control suppressor activity of regulatory T cells in chronic Chagas cardiomyopathy patients

IntroductionChagas disease, caused by the protozoan Trypanosoma cruzi (T. cruzi), is the fourth most important tropical disease, which affects approximately 7 million people worldwide. The mechanisms involved in the development of this disease are not completely well understood. An important protective role of regulatory T cells (Treg) in Chagas disease has been observed; however, the specific mechanisms remain unclear. We evaluated apoptosis as a possible mechanism mediated by Treg cells (CD4⁺CD25^HighFOXP3⁺) to orchestrate the immune response in chronic Chagas disease.Methods and resultsPatients with Chagas disease were grouped as the indeterminate (IND; asymptomatic patients with Chagas disease; n = 10) and dilated cardiomyopathy (CARD; n = 10). Healthy T. cruzi-negative individuals (NI; n = 10) were included as a control group. In order to evaluate the apoptotic cell profile, the expression of PD1, PD1L, CD39, CD95, CD95L molecules were investigated. We also evaluated the proportion of CD14⁺ cells expressing caspase 3. The IND group presented a substantially higher expression of CD39 by Treg cells as compared to the CARD group. On the other hand, the CARD group showed higher expression of PD-1 by Treg cells than both NI and IND groups. Significant positive correlations were observed between Treg CD95L⁺ cells and CD14 cells expressing caspase 3 as well as between Treg CD39 cells and CD14⁺ Caspase3⁺ cells in the IND group.ConclusionOur data indicate that the expressions of different molecules that induce apoptosis are associated with suppressive mechanisms mediated by Treg cells and suggest a possible role for PD1 and PDL1 molecules in the morbidity of chronic Chagas disease.