外周血液中miRNA表达与老年性黄斑变性相关性研究

目的　检测微小核糖核酸（microribonucleicacids，miRNA）在老年性黄斑变性（age-related macular degeneration，AMD）患者中的表达，并探讨miRNA的表达量与AMD病程之间的关系。方法　选取2014年1月至2016年11月于同济大学附属第十人民医院眼科门诊就诊的AMD患者6例为试验组，并选取同期6名正常人为对照组，通过基因芯片技术检测两组血液中miRNA的表达量。扩大样本的病例对照研究中共纳入126例AMD患者和140名正常人，检测其血液样本中miRNA的表达，比较两组人群间miRNA的表达量差异。结果　通过基因芯片技术，在试验组与对照组间共检测出216个miRNA存在表达差异（均为P<0.05），与对照组相比，试验组中111个miRNA表达量上升，105个miRNA表达量下降，差异均有统计学意义（均为P<0.05）。扩大样本的病例对照研究结果表明，在AMD患者中，miR-27a-3p、miR-29b-3p、miR-195-5p的表达量显著上升，同时，湿性AMD患者血液中miR-27a-3p的表达量高于干性AMD患者，差异均有统计学意义（均为P<0.05）。结论　AMD患者外周血中miRNA表达量水平有明显变化，miR-27a-3p、miR-29b-3p、miR-195-5p可能成为AMD血清学诊断和预后的标志物。     

不同病理类型的葡萄膜黑色素瘤中微小RNA差异表达谱分析

背景 目前研究证实微小RNA(miRNA)参与大多数人类肿瘤疾病的发生和发展,其作用类似于抑癌基因或癌基因.葡萄膜黑色素瘤(UM)是成人常见的眼部恶性肿瘤,其发生和转移机制仍未完全阐明.探讨UM组织中miRNA的差异表达情况有望为UM的靶向治疗提供依据. 目的 筛选不同病理类型的UM组织中特异性miRNA表达谱. 方法 收集于2013年3月至2015年10月在北京同仁医院手术局部切除并经常规组织病理学和免疫组织化学检测证实为梭型细胞型UM的标本4例和上皮细胞型UM标本4例,采用miRNA芯片分别检测2种UM组织中miRNA的表达,收集同期死于非肿瘤疾病的8个供体眼的正常葡萄膜组织作为对照,利用组间差异倍数筛选出差异≥2倍差异表达的miRNA;用在线软件预测差异表达miRNA的靶基因,采用生物信息学方法分析靶基因参与的信号功能通路.采用实时定量PCR法验证芯片检测结果.结果 收集的梭形细胞型和上皮细胞型UM标本经组织病理学检查均得到确诊,免疫组织化学检测梭形细胞型及上皮细胞型UM组织中HMB45、黑色素-A和S-100均呈阳性反应.与正常葡萄膜组织比较,在梭形细胞型UM组织中差异表达的miRNA有109个,其中29个上调,80个下调,上调的miRNA包括miR-146a-5p、miR-25-3p和miR-29b-1-5p,下调的miRNA包括miR-126-5 p、miR-183-5p和miR-96-5p;上皮细胞型UM中差异表达的miRNA有50个,其中23个上调,27个下调,上调的miRNA包括miR-155-5p、miR-210和miR-378 a-5p;下调的miRNA包括miR-199a-5p、miR-143-3p和miR-143-5p.在梭形细胞型和上皮细胞型UM组织中共同上调的miRNA为miR-132-3p、miR-21-5p、miR-34a-5p和miR-34b-5p,共同下调的miRNA为miR-125b-2-3p、miR-126-3p、miR-199a-3p和miR-214-3p.梭形细胞型和上皮细胞型UM组织中差异表达的miRNA所预测的靶基因分别参与癌症通路、丝裂原活化蛋白激酶(MAPK)信号通路、Wnt信号通路、细胞间黏附、胞吞作用、前列腺癌通路、结直肠癌通路和细胞黏附通路.结论 与正常葡萄膜组织相比,梭形细胞型UM和上皮细胞型UM组织中存在多种miRNA的差异表达,梭形细胞型UM和上皮细胞型UM组织之间也存在明显的miRNA差异表达,这些差异表达的miRNA可通过不同的信号转导通路参与调控UM的生物学行为.     

Plasma miR-26a-5p is a biomarker for retinal neurodegeneration of early diabetic retinopathy

PurposeRetinal neurodegeneration is an early pathological change in diabetic retinopathy (DR). Early-stage retinal neurodegeneration is usually asymptomatic. This study aims to identify circulating microRNAs (miRNAs) as sensitive biomarkers for early retinal neurodegeneration.MethodsWe profiled the plasma miRNA expression in three mild nonproliferative diabetic retinopathy (NPDR) cases and three matched non-DR patients using RNA sequencing. The differential miRNAs were validated with qRT-PCR. The retinal nerve fibre layer (RNFL) thickness of the eyes was measured using spectral-domain Optical coherence tomography (SD-OCT). The association between differential miRNAs and RNFL thickness was analysed using the Pearson correlation analysis. Bioinformatics tools were used to predict potential targets of miRNA associated with RNFL thickness and investigate the functions of the potential target genes.ResultsRNA sequencing identified 69 differential miRNAs and eight of them were reported to be associated with DR. The qRT-PCR for these eight miRNAs validated the down-regulation of circulating miR-26a-5p and miR-126-5p in a larger validating cohort. A positive correlation between plasma miR-26a-5p level and the RNFL thickness of the superior quadrant of both eyes was identified in another cohort, including 33 mild NPDR cases, 33 matched non-DR patients and 20 healthy controls. Furthermore, 367 candidate targets of miR-26a-5p were predicted. The functional studies revealed that these target genes are profoundly involved in various cellular functions and signalling pathways.ConclusionsCirculating miR-26a-5p is a potential biomarker for early-stage retinal neurodegeneration and it may be involved in the development of DR via profoundly influencing the functions of retinal cells.Subject terms: Retina, Prognostic markers     

Altered microRNA expression profiles in retinas with diabetic retinopathy

Rats with streptozotocin (STZ)-induced diabetes were studied in order to identify abnormal microRNA (miRNA) expression profiles in diabetic retinopathy (DR) and to ascertain miRNAs associated with DR. Histopathologically, we observed characteristic features of DR in rats at 10 weeks after STZ injection. Investigation of miRNA expression profiles in the retinas of control and diabetic rats using miRNA microarrays revealed that many miRNAs were abnormally expressed in DR. On the basis of their fold changes and probability values, a total of 37 miRNAs were selected for further validation by real-time PCR analysis. The results showed that 11 miRNAs were significantly upregulated and 6 miRNAs were notably downregulated in DR. Furthermore, these changes in retinal miRNA expression levels paralleled the course of DR. Levels of miR-182, miR-96, miR-183, miR-211, miR-204, and miR-124 were significantly increased during the progress of DR, whereas miR-10b, miR-10a, miR-219-2-3p, miR-144, miR-338, and miR-199a-3p were significantly decreased. Our data indicate that the aberrant miRNA expression profiles in DR are associated with the development of DR. Modulation of retinal miRNA expression levels may provide a potential therapeutic strategy for DRs.     

Long Noncoding RNA 3632454L22Rik Contributes to Corneal Epithelial Wound Healing by Sponging miR-181a-5p in Diabetic Mice

PurposeThis work explores the abnormal expression of long noncoding RNAs (lncRNAs), microRNAs (miRNAs) and messenger RNAs (mRNAs) in diabetic corneal epithelial cells (CECs) and constructs an associated competitive endogenous RNA (ceRNA) network. Moreover, we revealed that Rik may exert advantageous effects on diabetic corneal epithelial wound closure by sponging miR-181a-5p.MethodsWe obtained the profiles of differentially expressed lncRNAs (DELs) of CECs of type 1 diabetic versus control corneas by microarray and summarized the differentially expressed miRNAs (DEmiRs) and differentially expressed genes (DEGs) data by published literature. Subsequently, the ceRNA network was constructed using bioinformatics analyses. The levels of lncRNA ENSMUST00000153610/3632454L22Rik (Rik) and miR-181a-5p were verified. The localization of Rik was identified with fluorescence in situ hybridization (FISH), and dual-luciferase assays proved the targeted relationship between Rik and miR-181a-5p. Furthermore, we validated the functional impact of Rik in vitro.ResultsOverall, 111 upregulated and 117 downregulated DELs were detected in diabetic versus control CECs. The level of Rik located in both the cytoplasm and the nucleus was clearly downregulated, whereas miR-181a-5p was upregulated in vitro and in vivo in the diabetic group versus the control group. Rik can act as a ceRNA to bind to miR-181a-5p, thus promoting diabetic corneal epithelial wound healing in vitro.ConclusionsThis work investigated the expression profile of DELs and constructed ceRNA networks of diabetic CECs for the first time. Furthermore, we revealed that Rik may positively impact diabetic corneal epithelial wound healing by sponging miR-181a-5p, providing a novel potential therapeutic target of diabetic keratopathy (DK).     

糖尿病视网膜病变患者血清微核糖核酸表达谱的初步研究

目的本研究旨在探讨血清微核糖核酸(miRNA)成为糖尿病视网膜病变(DR)生物标志物的可能性。 方法队列研究。2014年11月至2015年6月,招募中国医科大学附属盛京医院眼科和内分泌科患者69例作为研究对象。其中,单纯糖尿病患者30例作为单纯糖尿病组,DR患者39例作为DR组。两组采用数字表法各随机选取3例患者,应用miRNA芯片技术检测血清miRNA的表达水平;使用分层聚类分析,获得DR患者的血清miRNA表达谱;利用生物信息学方法,分析特异性表达的血清miRNA的靶基因及其相关信号通路。采用实时荧光定量聚合酶链式反应(qRT-PCR)技术,检测两组患者血清中特异性miRNA的表达水平。采用受试者工作特征曲线(ROC曲线),评价血清中特异性miRNA对DR的诊断效能。 结果miRNA芯片技术检测表明,在3100种成熟的miRNA中,共筛选出19种差异miRNA。其中,13种表达上调;6种表达下调。结果表明,在DR患者血清中存在特异性表达的miRNA。qRT-PCR检测表明,DR组miR-19b、miR-221和miR-18b表达均上调,差异有统计学意义(U＝256.027,125.515,254.017;P<0.05),并且与miRNA芯片筛选的结果相符。受试者工作特征曲线结果表明,miR-19b(曲线下面积＝0.78,95%CI＝0.66~0.90)、miR-221(曲线下面积＝0.89,95%CI＝0.81~0.97)和miR-18b(曲线下面积＝0.78,95%CI＝0.67~0.90)对DR均有较高的诊断效能,其中miR-221诊断效能最高。 结论DR患者血清中存在特异性miRNA表达谱,这些差异性表达的miRNA可能作为调控因子,通过调节靶基因调控DR的发生和发展,其中miR-221最有望成为DR的生物标志物。     

叔丁基对苯二酚对糖尿病大鼠视网膜的保护作用及其机制研究

目的　探讨叔丁基对苯二酚（tert-Butylhydroquinone,tBHQ）对糖尿病大鼠视网膜的保护作用及其机制,为DR防治提供新靶点。方法　18只雄性SD大鼠随机分成3组:正常组、糖尿病组（高脂高糖饮食）和tBHQ干预组（高脂高糖饮食中加入质量分数1%tBHQ）,后两组饮食干预4周后建立糖尿病大鼠模型,饮食干预3个月后处死各组大鼠。采集大鼠空腹血用于测定生化和胰岛素相关指标,HE染色观察大鼠视网膜各层组织变化,使用miRNA表达谱芯片测量大鼠视网膜差异性miRNA,实时定量PCR验证特定miRNA在3组大鼠视网膜的表达水平,分析差异性miRNA的相关通路。结果　tBHQ干预组［（15.073±7.079）mmol·L^-1］较正常组［（7.635±1.421）mmol·L^-1］空腹血糖升高（P<0.05）,较糖尿病组［（22.331±1.824）mmol·L^-1］降低（P<0.05）。tBHQ干预组［（47.961±15.256）μU·L^-1］血清胰岛素较正常组［（78.090±20.974）μU·L^-1］减少,而较糖尿病组［（17.533±3.959）μU·L^-1］增多（均为P<0.01）。HE染色结果示,糖尿病组大鼠视网膜出现严重水肿,各层结构不清,tBHQ干预组视网膜改变相对轻微。与糖尿病组大鼠相比,tBHQ干预组视网膜中miR-325-3p（>2.0倍）和miR-551b-3p（>1.5倍）上调,miR-652-3p（>2.0倍）下调。实时定量PCR验证miR-325-3p和miR-551b-3p为差异性miRNA,靶基因预测分析示miR-325-3p可介导21条信号通路。结论　tBHQ可能通过miR-325-3p介导的信号通路对2型糖尿病大鼠视网膜起保护作用。     

白塞氏病患者血浆中微小RNA异常表达的初步研究

目的：检测白塞氏病(BD)患者和正常人群血浆中微小核糖核酸(microRNA，miRNA)的差异表达谱，探讨miRNA在BD发病中的作用，寻找与BD相关的血浆生物标记物。

方法：收集15例活动期BD患者和15例正常人的抗凝静脉血，离心获得血浆，提取总RNA，经miRNA标记、miRNA阵列杂交、miRNA阵列扫描和分析获得BD患者异常表达的miRNA谱。通过miRTarBase(靶基因数据库)检索差异性表达的miRNA已经过验证的靶基因，并选取与免疫学相关的差异性表达的miRNA进行Real time-PCR验证。

结果：活动期BD患者血浆中hsa-miR-34c-5p、hsa-miR-144-3p、hsa-miR-483-3p较正常人表达上调，hsa-miR-301a-3p、hsa-miR-224-5p、hsa-miR-454-3p、hsa-miR-17-5p、hsa-miR-199a-5p较正常人表达下调。

结论：miRNA的差异性在BD的发生发展过程发挥重要作用，异常表达的miRNA可能通过Notch1和SMAD4信号通路促进BD发病。     

Expression of microRNAs in fibroblast of pterygium

AIM: To screen microRNAs (miRNAs) and set up target miRNAs in pterygium. METHODS: Primary fibroblasts were isolated from pterygium and Tenon''s capsule and cultured. Immunocytochemical analysis and Western blotting were performed to confirm the culture of fibroblasts. In all, 1733 miRNAs were screened in the first step by using GeneChip® miRNA3.0 Array. Specific miRNAs involved in the pathogenesis of pterygium were subsequently determined using the following criteria: 1) high reproducibility in a repetitive test; 2) base log value of >7.0 for both control and pterygial fibroblasts; and 3) log ratio of >1.0 between pterygial fibroblasts and control fibroblasts. RESULTS: Primary screening showed that 887/1733 miRNAs were up-regulated and 846/1733 miRNAs were down-regulated in pterygial fibroblasts compared with those in control fibroblasts. Of the 1733 miRNAs screened, 4 miRNAs, namely, miRNA-143a-3p, miRNA-181a-2-3p, miRNA-377-5p and miRNA-411a-5p, met the above-mentioned criteria. Primary screening showed that these 4 miRNAs were up-regulated in pterygial fibroblasts compared with control fibroblasts and that miRNA-143a-3p had the highest mean ratio compared with the miRNAs in control fibroblasts. CONCLUSION: miRNA-143a-3p, miRNA-181a-2-3p, miRNA-377-5p and miRNA-411a-5p are up-regulated in pterygial fibroblasts compared with control fibroblasts, suggesting their involvement in the pathogenesis of pterygium.     

miR-204调控眼科疾病的研究进展

微小RNA(miRNA)是一类广泛存在于真核生物体内、长度为20～ 25个核苷酸、具有调控功能的非编码单链RNA,参与机体的各种生命进程,包括细胞的生长、分化、增生、凋亡和自噬.miRNA-204-5p(miR-204-5p)是由位于染色体9q21.12上的TRPM3大内含子6表达.研究发现,miR-204在角膜损伤愈合过程中起着十分重要的作用,亦能够保持静止状态下血-视网膜屏障的稳定,并且在人小梁网细胞中,miR-204与细胞的凋亡、生存能力以及炎症介质的表达有着重要联系.这些研究都表明miR-204在眼部呈多维表达,提示miR-204很可能是不同眼部疾病的关键miRNA.本文从miRNA的生物合成,miR-204与糖尿病性角膜病变、视网膜色素上皮细胞、人小梁网细胞、年龄相关性白内障、糖尿病视网膜病变、视网膜母细胞瘤的关系,以及miR-204与自噬的相关研究等几个方面,就miR-204调控眼科疾病的研究进展进行综述,为探寻眼部难治性疾病的防治方法寻找新的靶点.     

Decreased microRNA-155 Expression in Ocular Behcet's Disease but Not in Vogt Koyanagi Harada Syndrome

Purpose. MicroRNAs (miRNAs) have emerged as a class of gene expression regulators involved in immune regulation. In the present study, we investigated the role of miRNA in two uveitis entities: Behcet's disease (BD) and Vogt Koyanagi Harada syndrome (VKH). Methods. The expression of five miRNAs was studied in PBMCs, DCs, and CD4(+) T cells from BD patients with active and inactive uveitis, VKH patients with active uveitis, and healthy controls using real-time PCR. MiR-155 mimics and inhibitor were transfected to DCs to evaluate the effect on DC maturation and cytokine production by these cells and CD4(+) T cells. Luciferase reporter assays and Western blotting were performed to identify the target gene of miR-155. Results. Only miR-155 expression was significantly decreased in PBMCs and DCs from BD patients with active uveitis and no differences were observed in the miRNA expression in cells from patients with VKH as compared with controls. Overexpression of miR-155 in DCs was shown to inhibit the production of IL-6 and IL-1β, and to promote the expression of IL-10 by these cells. MiR-155 transfected DCs significantly inhibited intracellular IL-17 expression in allogeneic CD4(+) T cells; however, it did not influence the expression of cell surface markers CD80, CD40, CD83, CD86, and HLA-DR. Luciferase reporter assays revealed that TAB2 was a target gene of miR-155, which was confirmed by Western blotting. Conclusions. The present results suggest that miR-155 expression is decreased in active BD but not in VKH patients. Downregulated miR-155 may be involved in BD pathogenesis by targeting TAB2.     

Repressed miR-34a Expression Dictates the Cell Fate to Corneal Endothelium Failure

PurposeTo reveal the mechanism triggering the functional disparity between degenerated and non-degenerated corneal endothelium cells in the water efflux from corneal stroma to the anterior chamber.MethodsThe varied levels of the microRNA (miR)-34, miR-378, and miR-146 family in human corneal endothelium and cultured cells thereof were investigated using 3D-Gene Human miRNA Oligo Chips. Concomitantly, CD44, p53, c-Myc, matrix metalloprotease (MMP)-2 expression, and Ras homolog gene family member A (Rho A) activity was correlated to the expression intensities of these microRNAs, partly complemented with their altered expression levels with the transfection of the corresponding mimics and inhibitors. The levels of miRs were further associated with intracellular pH (pHi) and mitochondrial energy homeostasis.ResultsP53-inducible miR-34a/b repressed CD44 expression, and CD44 was repressed with the elevated c-Myc. The repressed miR-34a activated the CD44 downstream factors Rho A and MMP-2. MiR-34a mimics downregulated pHi, inducing the skewing of mitochondrial respiration to oxidative phosphorylation. The oxidative stress (H₂O₂) induced on human corneal endothelial cells, which repressed miR-34a/b expression, may account for the impaired signaling cascade to mitochondrial metabolic homeostasis necessary for an efficient water efflux from the corneal stroma.ConclusionsThe upregulated expression of CD44, through repressed miR-34a/b by reactive oxygen species and elevated c-Myc by oxidative stress, may impair mitochondrial metabolic homeostasis, leading to human corneal endothelial failure.     

Inhibition of miR-665-3p Enhances Autophagy and Alleviates Inflammation in Fusarium solani-Induced Keratitis

PurposeAccumulated evidence has shown that microRNAs (miRNAs) are closely related with the regulation of autophagy, which plays vital roles in fungal keratitis (FK). Microarray data showed elevated expression of miR-665-3p in mouse corneal tissues after infection with Fusarium solani (F. solani). Here, we investigated the effect of miR-665-3p in regulating autophagy in experimental F. solani keratitis and determined the potential molecular mechanisms involved.MethodsIn this article, we established an in vivo mouse model of FK and an in vitro model of corneal stromal cells by inoculating with F. solani. We divided them into the following six groups: control, chloroquine (CQ), rapamycin (Rapa), miR-665-3p antagomir (ant-665), miR-665-3p agomir (miR-665), and the negative control group (miR-NC). The levels of autophagy were detected by electron microscopy, Western blotting, and immunofluorescence. Then, we used a dual-luciferase reporter assay to determine the binding of miR-665-3p to the autophagy-related gene (ATG)5 3''UTR. Detection of IL-1β protein levels and hematoxylin and eosin (H&E) staining of corneal tissues were used to observe the effect of miR-665-3p on inflammation in FK.ResultsHere, we showed that inhibition of miR-665-3p expression in FK upregulated autophagy and alleviated inflammation. Nevertheless, the opposite results were found by overexpressing miR-665-3p. Additionally, ATG5 was a direct target gene for miR-665-3p.ConclusionsTogether, our data demonstrated that miR-665-3p might be involved in F. solani keratitis of mice by regulating autophagic pathways and inflammation.     

Development of Retinal Pigment Epithelium from Human Parthenogenetic Embryonic Stem Cells and MicroRNA Signature

Purpose. We investigated the potential of human parthenogenetic embryonic stem cells (hPESCs) to differentiate into RPE cells, and identified development-regulating microRNAs (miRNAs). Methods. RPE cells were derived from hPESCs. The expression of markers and miRNA expression profiles during differentiation were studied by immunocytochemistry, real-time RT-PCR, and miRNA expression array at three time points. Human fetal RPE (hfRPE) cells also were analyzed. The target genes of candidate miRNAs then were validated. Results. hPESC-derived RPE cells exhibited similar morphology and pigmentation to hfRPE cells. The expression of markers during differentiation indicated that the hPESC-derived RPE cells were immature. Most specific miRNAs had a role at some time point during the differentiation and maturation of RPE from hPESCs, except for two miRNAs (miR-204 and the miR-302 family). The miR-204 was upregulated and miR-302 was down-regulated throughout the process. Subsequently, pigmented clusters and RPE signature gene expression increased significantly in the miR-204 overexpression group and miR-302 inhibition group compared to the control groups. CTNNBIP1 and TGFBR2 were confirmed to be the target genes of miR-204 and miR-302, respectively. Conclusions. hPESCs can develop into RPE-like cells and, thus, can be additional promising sources of RPE cells in cell therapy. The miR-204, miR-302s, and their targets are involved in regulating directed differentiation during the full course, thereby contributing to the search for a new method of improving differentiation efficiency using miRNAs.     

miR-30b-5p 抑制Notch信号通路活化对实验性自身免疫性葡萄膜炎的治疗作用

目的　探讨miR-30b-5p对实验性自身免疫性葡萄膜炎(EAU)大鼠Notch信号通路活化的调控机制及治疗作用。方法　通过Target Scan（http://www.targetscan.org/）对Notch1和Dll4基因与 miR-30b 的关系进行生物信息学预测。将雌性Lewis大鼠随机分为对照组、EAU组、miR-30b-5p组和miR-30b-5p空载体（miR-30b-5p-N）组。EAU组、miR-30b-5p组和miR-30b-5p-N组大鼠首先诱导EAU模型,miR-30b-5p组和miR-30b-5p-N组大鼠分别采用携带miR-30b-5p和miR-30b-5p-N的慢病毒于EAU大鼠脾脏进行注射干预处理,EAU组大鼠于同一部位注射相同体积的生理盐水。处理后12 d,实时荧光定量PCR检测4组大鼠脾脏、淋巴结和眼组织中Notch1和Dll4 mRNA的表达;免疫组织化学检测4组大鼠脾脏、淋巴结及眼组织中Notch1和Dll4蛋白的表达,分析miR-30b-5p对葡萄膜炎大鼠Notch信号通路的调控作用。结果　生物信息学预测分析结果表明,Notch 信号通路上 Notch1和Dll4基因均为 miR-30b 调控的靶基因。免疫后12 d,相比于对照组,EAU组、miR-30b-5p组和miR-30b-5p-N组大鼠脾脏、淋巴结和眼组织中Notch1和Dll4 mRNA水平均升高（均为P<0.05）;经miR-30b-5p干预治疗后,miR-30b-5p组脾脏、淋巴结和眼组织中Notch1和Dll4 mRNA表达均显著降低（均为P<0.05）。免疫组织化学检测结果显示,免疫后12 d,EAU组、miR-30b-5p组和miR-30b-5p-N组大鼠脾脏、淋巴结和眼组织中Notch1和Dll4 蛋白表达均上调（均为P<0.05）;miR-30b-5p干预治疗后,脾脏、淋巴结和眼组织中Notch1和Dll4蛋白表达均显著下调（均为P<0.05）。结论　miR-30b-5p可明显下调EAU大鼠各组织中Notch1和Dll4等Notch信号通路相关分子的表达进而抑制Notch信号通路活化,从而达到治疗葡萄膜炎的作用。     

Regulatory role of miR-146a in corneal epithelial wound healing via its inflammatory targets in human diabetic cornea

PurposeMiR-146a upregulated in limbus vs. central cornea and in diabetic vs. non-diabetic limbus has emerged as an important immune and inflammatory signaling mediator in corneal epithelial wound healing. Our aim was to investigate the potential inflammation-related miR-146a target genes and their roles in normal and impaired diabetic corneal epithelial wound healing.MethodsOur previous data from RNA-seq combined with quantitative proteomics of limbal epithelial cells (LECs) transfected with miR-146a mimic vs. mimic control were analyzed. Western blot and immunostaining were used to confirm the expression of miR-146a inflammatory target proteins in LECs and organ-cultured corneas. Luminex assay was performed on conditioned media at 6- and 20-h post-wounding in miR-146a mimic/inhibitor transfected normal and diabetic cultured LECs.ResultsOverexpression of miR-146a decreased the expression of pro-inflammatory TRAF6 and IRAK1 and downstream target NF-κB after challenge with lipopolysaccharide (LPS) or wounding. Additionally, miR-146a overexpression suppressed the production of downstream inflammatory mediators including secreted cytokines IL-1α, IL-1β, IL-6 and IL-8, and chemokines CXCL1, CXCL2 and CXCL5. These cytokines and chemokines were upregulated in normal but not in diabetic LEC during wounding. Furthermore, we achieved normalized levels of altered secreted cytokines and chemokines in diabetic wounded LEC via specific inhibition of miR-146a.ConclusionOur study documented significant impact of miR-146a on the expression of inflammatory mediators at the mRNA and protein levels during acute inflammatory responses and wound healing, providing insights into the regulatory role of miR-146a in corneal epithelial homeostasis in normal and diabetic conditions.