Upregulation of miR-144-3p alleviates Doxorubicin-induced heart failure and cardiomyocytes apoptosis via SOCS2/PI3K/AKT axis

MicroRNAs (miRs) are implicated in heart failure (HF). Thereby, we aim to uncover the role of miR-144-3p in HF. Doxorubicin (Dox)-induced HF model was constructed in rats and cardiomyocytes H9C2, and the cardiac function was determined using ultrasound cardiogram. Morphology of cardiac tissue was observed using hematoxylin–eosin (H&E) staining. The viability and apoptosis of Dox-treated and transfected cardiomyocytes were determined using Cell Counting Kit-8 (CCK-8) assay and flow cytometry. Relative expressions of the HF-associated miRs (including miR-144-3p), suppressor of cytokine signaling 2 (SOCS2), apoptosis- and phosphoinositide 3-kinase (PI3K)/AKT pathway-related factors (B-cell lymphoma 2, Bcl-2; Bcl-2 associated X protein, Bax; cleaved [C] capsase-3; phosphoinositide 3-kinase, PI3K; phosphorylated-PI3K, p-PI3K; p-AKT; AKT) were measured with quantitative real-time polymerase chain reaction or Western blot. Target gene of miR-144-3p was predicted by Starbase and TargetScan and confirmed with dual-luciferase reporter assay. Dox caused rat cardiac dysfunction, aggravated cardiac injury, decreased cardiomyocytes viability, and the expression of miR-144-3p, Bcl-2, and phosphorylation of both PI3K and AKT yet the upregulated those of Bax and C caspase-3, which was reversed by upregulating miR-144-3p, whereas downregulating miR-144-3p did oppositely. SOCS2 was the target gene of miR-144-3p, Dox promoted SOCS2 expression, which was reversed by upregulating miR-144-3p, while downregulating miR-144-3p did conversely. In addition, silencing SOCS2 reversed the effects of miR-144-3p downregulation in Dox-treated cardiomyocytes. Upregulating miR-144-3p alleviated Dox-induced cardiac dysfunction and cell apoptosis via targeting SOCS2, providing a novel evidence of miR-144-3p in HF.     

miR-186-5p对冠心病大鼠血管内皮细胞损伤及FGF2/FGFR1信号通路的影响

目的　探究微小RNA-186-5p（miR-186-5p）对冠心病（CHD）大鼠血管内皮细胞损伤的影响,以及对成纤维细胞生长因子2（FGF2）/成纤维细胞生长因子受体1（FGFR1）信号通路的作用。方法　48只雄性SD大鼠均分成对照组、模型组、miR-186-5p抑制剂组和miR-186-5p抑制剂NC组。除对照组外,其余组大鼠均构建CHD模型,并给予相应干预4周。测定大鼠左心室射血分数（LVEF）、左心室缩短分数（LVFS）以及血清中总胆固醇（TC）、三酰甘油（TG）、高密度脂蛋白胆固醇（HDL-C）、低密度脂蛋白胆固醇（LDL-C）、白细胞介素（IL）-1β、IL-6和肿瘤坏死因子（TNF）-α、一氧化氮（NO）和内皮素（ET）-1水平;苏木素-伊红（HE）染色观察各组大鼠冠状动脉组织的病理学变化;Western blot法检测大鼠冠状动脉组织中FGF2、FGFR1蛋白相对表达水平;双荧光素酶验证miR-186-5p与FGF2的靶向关系。结果　对照组大鼠冠状动脉血管管壁形态均匀,无炎性细胞浸润;模型组和miR-186-5p抑制剂NC组血管内皮细胞排列紊乱,炎性细胞浸润明显;miR-186-5p抑制剂组较模型组病理变化程度减轻,炎性细胞浸润减少。与对照组比较,模型组LVEF、LVFS、HDL-C、NO水平及FGF2、FGFR1蛋白相对表达水平降低,而TC、TG、LDL-C、IL-1β、IL-6、TNF-α、ET-1水平升高（P＜0.05）。与模型组和miR-186-5p抑制剂NC组比较,miR-186-5p抑制剂组大鼠LVEF、LVFS、HDL-C、NO水平及FGF2、FGFR1蛋白相对表达水平升高,而TC、TG、LDL-C、IL-1β、IL-6、TNF-α、ET-1水平降低（P＜0.05）。模型组和miR-186-5p抑制剂NC组各指标差异无统计学意义（P＞0.05）。双荧光素酶报告实验结果证实,miR-186-5p与FGF2存在靶向结合位点。结论　miR-186-5p的下调可减轻CHD大鼠的炎症反应和血管内皮细胞损伤,该作用与激活FGF2/FGFR1信号通路有关。     

荧光定量聚合酶链反应检测miR-342-3p及靶基因EVL在多发性骨髓瘤细胞中的表达

目的研究多发性骨髓瘤(MM)患者中miR-342-3p及靶基因EVL的表达情况及意义。方法建立应用颈环式结构引物反转录扩增微小RNA(miRNA)的反转录-聚合酶链反应(RT-PCR)方法 ,并采用荧光定量聚合酶链反应(RQ-PCR)对miR-342-3p及靶基因EVL的表达进行定量分析。结果①5例MM患者中miR-342-3p相对表达量为7.6±5.7,与对照组比较差异有统计学意义(P<0.05)。②MM细胞株U266中miR-342-3p相对表达量为7.0±3.2,较对照组表达增加,差异有统计学意义(P<0.05)。③5例MM患者中EVL基因相对表达量为6.3±3.2,较对照组表达增加,差异有统计学意义(P<0.05)。④MM细胞株U266中EVL基因相对表达量为4.3±1.1,较对照组表达增加,差异有统计学意义(P<0.05)。结论 MM存在miR-342-3p及EVL基因表达异常,可能为研究MM发病机制提供思路。     

微RNA-182-5p激动剂和抑制剂对肝癌细胞增殖和迁移的影响

目的研究微RNA(miR)-182-5p激动剂和抑制剂对肝癌细胞增殖和迁移的影响。方法采用实时荧光定量-聚合酶链反应(RT-qPCR)和蛋白质印迹法检测非肝细胞癌(HCC)肝组织,HCC组织及邻近组织标本中miR-182-5p的表达水平以及RND3的mRNA/蛋白表达水平。建立患者来源的HCC细胞培养物,并进行miR-182-5p激动剂和抑制剂转染处理,以分别模拟miRNA的过表达和敲减。通过Transwell细胞侵袭实验监测体外HCC细胞的迁移。通过细胞活力和增殖评价体外HCC细胞的生长。结果与非HCC或邻近的HCC组织相比,HCC组织中的miR-182-5p明显上调,与RND3 mRNA表达呈负相关。使用miR-182-5p激动剂可显著降低HCC细胞中RND3 mRNA/蛋白质表达水平。通过荧光素酶试验和顺乌头酸酶2(AGO2)-RNA免疫沉淀分析,验证了miR-182-5p对RND3 mRNA具有靶向作用。MiR-182-5p激动剂可显著降低RND3表达,促进HCC细胞体外迁移和侵袭,可能是通过Rho相关卷曲螺旋蛋白激酶1(ROCK1)和ROCK2的抑制来实现。结论miR-182-5p可以通过靶向RND3来提高体外HCC细胞的迁移和增殖。使用miR-182-5p抑制剂,可以抑制体外肝癌细胞的迁移和增殖。     

Mechanisms of migration and invasion promoted by NSCLC cells-derived exosomes

OBJECTIVE To explore the function and mechanism of exosomes from non-small cell lung cancer(NSCLC) in promoting the invasion and metastasis of lung cancer cel s. METHODS The exosomes were isolated and identified by differential centrifugation, nanosight,transmission electron microscope and Western blotting.Observation of the exosome uptake was applied by immune fluorescent confocal experiments. Scratch test was used to detect the influence of exosomes to tumor cells migration ability and transwell assay were carried out to investigate the effect of exosomes on migration and invasion. Total RNAs from exosomes were used for miRNA library preparation and sequencing. RT-Q-PCR was employed to detect the miRNA levels. Western blotting was adopted to detect the protein expression levels and dual luciferase reporter assay was used to verify the predict target site of miRNA. RESULTS The extracellular vesicles in the supernatant of NSCLC cells were isolated by the differential centrifugation and confirmed as exosomes by nanosight, transmission electron microscope and Western blotting. Exosomes from NSCLC can promote migration and invasion of non-small cell lung cancer cells showing concentration-and time-dependent manner. By analyzing the differential expression profile of exosomes miRNA of lung epithelial cells and lung cancer cell A549,30 miRNAs were screened out. Then, hsa-miR-34c-3p was selected in combination with clinical specimen detection. The expression level of miR-34c-3p in exosomes from lung cancer was lower than that of the normal one.CONCLUSION Exosomes from NSCLC cells can be uptaken by cells and promote cell migration and invasion in dose-dependent manner. The expression level of miR-34c-3p in exosomes from NSCLC is significantly lower than normal tissues. The level of miR-34c-3p was further declined after incubating with exosomes. Exosomes from NSCLC cells can deliver miR-34c-3p to recepted cells and up-regulate the protein level of integrin α2β1.     

微小RNA-204-5p靶向蛋白质酪氨酸磷酸酶1B基因对缺氧复氧诱导的大鼠心肌细胞氧化应激的影响

目的 探讨miR-204-5p对缺氧复氧诱导大鼠心肌细胞H9C2氧化应激的调控作用机制.方法 体外培养大鼠胚胎心肌细胞H9C2,构建心肌细胞缺氧/复氧模型.实验分为空白组、缺氧复氧组、缺氧复氧+miR-con组、缺氧复氧+miR-204-5p组、缺氧复氧+miR-204-5p+pcDNA组、缺氧复氧+miR-204-5...     

缺氧/复氧诱导心肌细胞分泌高表达miR-208b的外泌体而调控心肌成纤维细胞活化、迁移和铁死亡

目的　探讨缺氧/复氧诱导心肌细胞所分泌的外泌体能否通过miR-208b调控心肌成纤维细胞的生物学功能。方法　心肌细胞进行缺氧/复氧处理后,收集所分泌外泌体与心肌成纤维细胞进行共培养,然后用荧光定量PCR、Western blot或酶联免疫吸附试验（ELISA）检测miR-208b、α-平滑肌肌动蛋白（α-SMA）、Collagen Ⅰ、Collagen Ⅲ和谷胱甘肽过氧化物酶4（GPX4）的表达,细胞计数试剂盒-8（CCK-8）检测细胞存活力,Transwell检测细胞迁移,商用试剂盒检测活性氧（ROS）、丙二醛（MDA）和Fe²⁺的累积。采用单因素方差分析（ANOVA）。结果　缺氧/复氧诱导心肌细胞和其分泌的外泌体高表达miR-208b,将此类外泌体加入到心肌成纤维细胞进行共培养时发现,心肌成纤维细胞可以摄入外泌体,从而上调自身miR-208b的表达,进而促进心肌成纤维细胞的存活力和迁移,增强α-SMA、Collagen Ⅰ和Collagen Ⅲ的表达,不过miR-208b的抑制物能显著减弱上述外泌体对心肌成纤维细胞生物学功能的调控作用。同时,缺氧/复氧心肌细胞源性外泌体能进一步增强铁死亡主要指标ROS、MDA和Fe²⁺的累积,抑制铁死亡关键调控因子GPX4的表达,不过miR-208b的抑制物能明显减弱Erastin和缺氧/复氧心肌细胞源性外泌体对铁死亡的影响作用。结论　缺氧/复氧心肌细胞源性外泌体能通过高表达的miR-208b而调控心肌成纤维细胞的生物学功能,表明miR-208b是介导心肌细胞和心肌成纤维细胞间通讯的关键分子。     

MicroRNA-10a-3p mediates Th17/Treg cell balance and improves renal injury by inhibiting REG3A in lupus nephritis

BackgroundThe therapeutic approaches guided toward microRNAs (miRNAs) have been extensively explored in lupus nephritis (LN), but the precise position of miR-10a-3p posted in disease is not translated thoroughly. Therein, this work pivoting on miR-10a-3p was launched with the involvement of regenerating islet-derived 3 α (REG3A).MethodsPeripheral blood samples from LN patients and healthy controls (n = 132) were collected. miR-10a-3p and REG3A expression in peripheral blood mononuclear cells were tested. Mice were injected with miR-10a-3p agomir, miR-10a-3p antagomir and/or REG3A low expression vector for presentation of their roles in renal function, T helper cell 17 (Th17)/regulatory cell (Treg) balance, renal pathological damage, JAK2/STAT3 pathway activation and renal injury in LN. The relation between miR-10a-3p and REG3A was tested.ResultsMiR-10a-3p was down-regulated while REG3A was up-regulated in LN. Restoring miR-10a-3p or silencing REG3A decreased Th17/Treg ratio in CD4⁺ T cells, inhibited JAK2/STAT3 pathway activation, ameliorated renal function, improved renal pathological damage and alleviated renal injury in LN. REG3A depletion negated the effects of down-regulated miR-10a-3p on LN. MiR-10a-3p targeted REG3A.ConclusionThe work elucidates that miR-10a-3p restoration decreases Th17/Treg ratio and attenuates renal injury in LN via inhibiting REG3A and the activation of JAK2/STAT3 pathway, which renews the therapeutic reference for LN management.     

Milk exosomes-mediated miR-31-5p delivery accelerates diabetic wound healing through promoting angiogenesis

The refractory diabetic wound has remained a worldwide challenge as one of the major health problems. The impaired angiogenesis phase during diabetic wound healing partly contributes to the pathological process. MicroRNA (miRNA) is an essential regulator of gene expression in crucial biological processes and is a promising nucleic acid drug in therapeutic fields of the diabetic wound. However, miRNA therapies have limitations due to lacking an effective delivery system. In the present study, we found a significant reduction of miR-31-5p expression in the full-thickness wounds of diabetic mice compared to normal mice. Further, miR-31-5p has been proven to promote the proliferation, migration, and angiogenesis of endothelial cells. Thus, we conceived the idea of exogenously supplementing miR-31-5p mimics to treat the diabetic wound. We used milk-derived exosomes as a novel system for miR-31-5p delivery and successfully encapsulated miR-31-5p mimics into milk exosomes through electroporation. Then, we proved that the miR-31-5p loaded in exosomes achieved higher cell uptake and was able to resist degradation. Moreover, our miRNA-exosomal formulation demonstrated dramatically improved endothelial cell functions in vitro, together with the promotion of angiogenesis and enhanced diabetic wound healing in vivo. Collectively, our data showed the feasibility of milk exosomes as a scalable, biocompatible, and cost-effective delivery system to enhance the bioavailability and efficacy of miRNAs.     

Mesenchymal stem cell-originated exosomal circDIDO1 suppresses hepatic stellate cell activation by miR-141-3p/PTEN/AKT pathway in human liver fibrosis

Liver fibrosis is a common pathologic stage of the development of liver failure. It has showed that exosomes loaded with therapeutic circRNAs can be manufactured in bulk by exosome secreted cells in vitro, thus enabling personalized treatment. This study aimed to investigate the role of exosome-based delivery of circDIDO1 in liver fibrosis. Levels of genes and proteins were examined by qRT-PCR and Western blot. Cell proliferation, apoptosis, and cell cycle were analyzed by using cell counting kit-8 (CCK-8) assay, EdU assay, and flow cytometry, respectively. The binding between circDIDO1 and miR-141-3p was confirmed by dual-luciferase reporter, RNA pull-down and RIP assays. Exosomes were isolated by ultracentrifugation, and qualified by transmission electron microscopy (TEM), nanoparticle tracking analysis (NTA) and Western blot. CircDIDO1 overexpression or miR-141-3p inhibition suppressed the proliferation, reduced pro-fibrotic markers, and induced apoptosis as well as cell cycle arrest in hepatic stellate cells (HSCs) by blocking PTEN/AKT pathway. Mechanistically, circDIDO1 acted as an endogenous sponge for miR-141-3p, further rescue experiments showed that circDIDO1 suppressed HSC activation by targeting miR-141-3p. Extracellular circDIDO1 could be incorporated into exosomes isolated from mesenchymal stem cells (MSCs), and transmitted to HSCs to restrain HSC activation. Clinically, low levels of serum circDIDO1 in exosome were correlated with liver failure, and serum exosomal circDIDO1 had a well diagnostic value for liver fibrosis in liver failure patients. Transfer of circDIDO1 mediated by MSC-isolated exosomes suppressed HSC activation through the miR-141-3p/PTEN/AKT pathway, gaining a new insight into the prevention of liver fibrosis in liver failure patients.     

黄芩苷通过上调miR-485-5p的表达抑制前列腺癌细胞的增殖

目的：从miRNAs的角度研究黄芩苷对前列腺癌细胞增殖的影响及其作用机制。方法：将不同浓度的黄芩苷作用22RV1细胞,应用MTT检测细胞的增殖情况,筛选最佳药物浓度;应用Real-Time PCR检测不同细胞系中miR-485-5p的表达量;检测黄芩苷处理22RV1细胞后miR-485-5p及JAK3 mRNA的表达;应用Western blot检测JAK3蛋白的表达;应用双荧光素酶基因系统验证miR-485-5p与JAK3的靶向作用关系;应用MTT法检测细胞的生存率。结果：筛选出最佳药物浓度为100 μmol·L^-1;22RV1细胞中miR-485-5p的表达量明显低于正常前列腺细胞;黄芩苷刺激细胞后miR-485-5p的表达上调;黄芩苷或miR-485-5p mimics可抑制前列腺癌细胞的JAK3 mRNA和蛋白的表达,miR-485-5p inhibitor可使JAK3 mRNA及蛋白的表达水平上调;黄芩苷或miR-485-5p均可抑制前列腺癌细胞的增殖。结论：黄芩苷通过上调miR-485-5p的表达,抑制前列腺癌细胞的增殖。     

MiR-142-3p enhances chemosensitivity of breast cancer cells and inhibits autophagy by targeting HMGB1

MiR-142-3p has been reported to act as a tumor suppressor in breast cancer. However, the regulatory effect of miR-142-3p on drug resistance of breast cancer cells and its underlying mechanism remain unknown. Here, we found that miR-142-3p was significantly downregulated in the doxorubicin (DOX)-resistant MCF-7 cell line (MCF-7/DOX). MiR-142-3p overexpression increased DOX sensitivity and enhanced DOX-induced apoptosis in breast cancer cells. High-mobility group box 1 (HMGB1) is a direct functional target of miR-142-3p in breast cancer cells and miR-142-3p negatively regulated HMGB1 expression. Moreover, overexpression of HMGB1 dramatically reversed the promotion of apoptosis and inhibition of autophagy mediated by miR-142-3p up-regulation. In conclusion, miR-142-3p overexpression may inhibit autophagy and promote the drug sensitivity of breast cancer cells to DOX by targeting HMGB1. The miR-142-3p/HMGB1 axis might be a novel target to regulate the drug resistance of breast cancer patients.     

Long non-coding RNA SNHG16 promotes lipopolysaccharides-induced acute pneumonia in A549 cells via targeting miR-370-3p/IGF2 axis

BackgroundPneumonia is an infectious lung inflammation in children with high mortality and morbidity rates. Small nucleolar RNA host gene 16 (SNHG16) has been verified to accelerate the progression of acute pneumonia. However, the role of SNHG16 in acute pneumonia has not yet been fully elucidated. The study was aimed to explore the regulatory mechanism of SNHG16 in LPS-induced acute pneumonia in A549 cells.MethodsThe levels of SNHG16, miR-370-3p and IGF2 in serum samples and LPS-induced A549 cells were detected by quantitative real-time polymerase chain reaction (qRT-PCR). The cell viability and apoptosis of A549 cells were examined by Cell Counting Kit-8 (CCK-8) assay and flow cytometer, respectively. The levels of interleukin 1β (IL-1β), interleukin 6 (IL-6) and tumor necrosis factor α (TNF-α) were determined by enzyme-linked immunosorbent assay (ELISA). The binding relationships among SNHG16, miR-370-3p and IGF2 were predicted by online database and verified by Dual-luciferase reporter and RNA immunoprecipitation (RIP) assays. The protein levels of IGF2 were tested by Western blot.ResultsSNHG16 and IGF2 were upregulated while miR-370-3p was downregulated in serum of acute pneumonia patients and LPS-induced A549 cells. SNHG16 regulated proliferation, apoptosis and inflammatory cytokines by inhibiting miR-370-3p in LPS-induced A549 cells. MiR-370-3p targeted IGF2 and inhibited LPS-induced inflammatory injury via IGF2 in A549 cells. Furthermore, SNHG16 was verified to promote IGF2 expression by sponging miR-370-3p in A549 cells.ConclusionSNHG16 impeded cell viability and promoted apoptosis, inflammatory injury by targeting IGF2 mediated by miR-370-3p in LPS-induced A549 cells.     

心理应激致血浆外泌体miR-184-3p抑制血管内皮细胞增殖、迁移功能的作用分析

目的 探讨心理应激源性血浆外泌体miR-184-3p在调控血管内皮细胞增殖、迁移功能中的作用。方法 （1）将60只6~8周龄C57BL/6雄性小鼠随机分为对照组和心理应激组,每组30只。采用21 d慢性不可预知性心理应激刺激建模。通过行为学实验（旷场实验、高架十字迷宫实验和强迫游泳实验）评价建模效果。提取血浆外泌体进行电镜分析,qPCR检测血浆外泌体miR-184-3p表达水平。（2）体外培养小鼠肺微血管内皮细胞（MPVEC）,分别转染对照组小鼠血浆外泌体（C-EXO组）、心理应激组小鼠血浆外泌体（S-EXO组）、NC mimic组和miR-184-3p mimic组。划痕实验分析细胞迁移情况,EdU染色分析细胞增殖情况。结果 （1）心理应激组小鼠探索行为较对照组显著降低,不动时间显著增加（P<0.01）。电镜分析验证血浆外泌体直径为30~200 nm的双层膜囊泡结构,qPCR证实心理应激组小鼠血浆外泌体中miR-184-3p的表达量显著增加（P<0.05）。（2）细胞实验结果显示S-EXO组细胞迁移和增殖能力较C-EXO组下降（P<0.01）;同时miR-184-3p mimic组细胞增殖和迁移能力较NC mimic组下降（P<0.05）。结论 慢性心理应激源性血浆外泌体可以通过介导miR-184-3p抑制血管内皮细胞的增殖和迁移。     

Monocyte exposure to fine particulate matter results in miRNA release: A link between air pollution and potential clinical complication

Chronic exposure to PM_2.5 contributes to the pathogenesis of numerous disorders, although the underlying mechanisms remain unknown. The study investigated whether exposure of human monocytes to PM_2.5 is associated with alterations in miRNAs. Monocytes were exposed in vitro to PM_2.5 collected during winter and summer, followed by miRNA isolation from monocytes. Additionally, in 140 persons chronically exposed to air pollution, some miRNA patterns were isolated from serum seasonally. Between-season differences in chemical PM_2.5 composition were observed. Some miRNAs were expressed both in monocytes and in human serum.MiR-34c-5p and miR-223-5p expression was more pronounced in winter. Bioinformatics analyses showed that selected miRNAs were involved in the regulation of several pathways. The expression of the same miRNA species in monocytes and serum suggests that these cells are involved in the production of miRNAs implicated in the development of disorders mediated by inflammation, oxidative stress, proliferation, and apoptosis after exposure to PM_2.5.     

MiR-215-5p inhibits the inflammation injury in septic H9c2 by regulating ILF3 and LRRFIP1

MicroRNAs (miRNAs) are small non-coding RNAs (ncRNAs) playing crucial roles in sepsis-induced diseases, including myocardial inflammation. Nevertheless, the expression pattern and role of miR-215-5p in myocardial inflammation are still un-investigated up to now. The purpose of our study is to further inquire the effect of miR-215-5p on lipopolysaccharide (LPS)-activated inflammation injury in H9c2 cells and the possibly associated mechanisms. First of all, LPS-induced H9c2 cells models were constructed and affirmed via detection of pro-inflammatory factors, the viability and apoptosis. MiR-215-5p was overtly down-regulated in LPS-treated H9c2 cells and miR-215-5p overexpression could suppress the inflammation injury. LRRFIP1 was proved to be the target gene of miR-215-5p and meanwhile, miR-215-5p also targeted ILF3 that experimented to bind to and stabilize LRRFIP1. Final rescue assays confirmed that the overexpression of LRRFIP1 or ILF3 rescued the repressive effect of miR-215-5p up-regulation on the inflammation injury in septic H9c2. Totally, miR-215-5p exerted protective function in the inflammation injury in septic H9c2 via targeting ILF3 and LRRFIP1, suggesting an additional treatment method for sepsis-activated myocardial inflammation.     

围生期缺血缺氧性脑病的微 RNA生物标志物筛选研究

目的研究围生期缺血缺氧性脑病( HIE)的微 RNA(miRNA)生物标志物的筛选情况。方法通过动态队列研究法获取 2020年 1月至 2021年 1月深圳市龙华区中心医院 144例 HIE病儿作为受试者。将其根据病情严重程度的差异分作轻度 HIE组 42例、中度 HIE组 62例以及重度 HIE组 40例,另取同期该院 50例健康新生儿作为对照组。分别采集所有新生儿脐带血进行测序比较分析差异表达 miRNA,筛选 3个和 HIE相关的 miRNA作为早期预测 HIE的生物标志物,并分析各组新生儿上述 3个 miRNA表达情况的差异。采用 Spearman相关性分析明确 HIE病情严重程度和 miRNA表达的关系。此外,将所有 HIE病儿按照是否合并脏器损伤分为合并脏器损伤组 102例以及未合并脏器损伤组 42例,比较两组上述 3个 miRNA表达情况的差异。此外,检测并比较 HIE组和对照组血清诱导型一氧化氮合酶( iNOS)、内皮素 -1水平。结果 miRNA芯片通过扫描、分析以及标准化处理,结果发现 miRNA芯片共检测 miRNA达 921种。相较于对照组, HIE病儿血浆中有 29种 miRNA表达异常升高, 26种 miRNA表达异常下降,选择差异有统计学意义的 miRNA实施生物学信息分析,发现了 miR-4472、miR-5195-3p以及 miR6794-5p可能具有潜在的预测 HIE作用。重度 HIE组 miR-4472、miR-5195-3p以及 miR-6794-5p表达水平分别为 0.71±0.12、2.34±0.28、2.24±0.24,均高于对照组的 0.20±0.04、0.78±0.15、0.47±0.11和轻度 HIE组的 0.37±0.08、0.92±0.18、0.89±0.15以及中度组的 0.55±0.09、1.45±0.23、1.46±0.20,且轻度 HIE组、中度 HIE组 miR-4472、miR-5195-3p以及 miR-6794-5p表达水平均高于对照组,中度 HIE组 miR-4472、miR-5195-3p以及 miR-6794-5p表达水平均高于轻度 HIE组(均 P<0.05)。 HIE病儿病情严重程度和 miR-4472、miR-5195-3p、miR-6794-5p表达均呈正相关关系(均 P<0.05)。合并脏器损伤 HIE病儿 miR-4472、miR-5195-3p、 miR-6794-5p表达水平分别为 0.60±0.09、2.05±0.18、1.70±0.31,均高于未合并脏器损伤组的 0.46±0.03、1.58±0.12、1.37±0.23(均 P<0.05)。 HIE组血清 iNOS及内皮素 -1水平均高于对照组(均 P<0.05)。结论 HIE的 miRNA生物标志物包括 miR-4472、miR5195-3p、miR-6794-5p,且上述 miRNA表达水平和病儿病情严重程度以及脏器损伤有关,值得临床重点关注。     

Circulating microRNA profiles altered in mice after 28 d exposure to perfluorooctanoic acid

Perfluorooctanoic acid (PFOA) is a stable man-made compound with many industrial and commercial uses. Recently, however, concern has been raised that it may induce various toxicological effects such as hepatotoxicity, immunotoxicity, and developmental toxicity. Because levels of circulating microRNAs (miRNAs) can be altered in several clinical diseases, they may serve as potential novel biomarkers. Here, we explored differences in the profiles of circulating miRNAs in mice after PFOA exposure. Using TaqMan miRNA arrays, we determined that the levels of 24 circulating miRNAs were altered in mice dosed with PFOA at 1.25 mg/kg/d and 73 were altered in mice dosed with 5 mg/kg/d. Eight miRNAs were further validated using TaqMan Real-Time PCR assays. Results were consistent with those obtained from the TaqMan miRNA arrays, except for miR-199a-3p. The most remarkable of the circulating miRNAs (miR-26b-5p and miR-199a-3p) were also up-regulated in the serum of occupational workers in our previous epidemiological study. We also found similar patterns in mice exposed to PFOS. These results demonstrated that circulating miRNA profiles were altered after exposure to high concentrations of PFOA and miR-28-5p, miR-32-5p, miR-122-5p, miR-192-5p, and miR-26b-5p in serum may be linked to effects of PFOA, especially in occupationally exposed people.     

miR-1307-3p通过靶向ISM1促进乳腺癌细胞的增殖和迁移

目的 探讨miR-1307-3p通过靶向ISM1促进乳腺癌细胞增殖和迁移的分子机制。方法 （1）利用TCGA 数据库分析miR-1307-3p在乳腺癌患者中的表达水平及其与临床指标的关系。（2）利用qPCR、CCK-8实验、细胞划 痕实验和流式细胞术检测过表达或沉默miR-1307-3p后乳腺癌MCF-7细胞miR-1307-3p表达、细胞增殖、迁移和凋 亡水平变化。（3）生物信息学分析软件预测 miR-1307-3p 的靶基因,同时采用双荧光素酶实验进行验证。结果 miR-1307-3p在乳腺癌细胞及乳腺癌组织中均显著上调。miR-1307-3p过表达可促进MCF-7细胞增殖和迁移;而 miR-1307-3p inhibitor则抑制细胞迁移,并诱导凋亡。ISM1可能是miR-1307-3p的靶基因。乳腺癌组织中ISM1表 达水平明显低于正常乳腺组织,且与临床病理分期有关。 结论miR-1307-3p可促进乳腺癌细胞增殖和迁移,可能 通过调控ISM1基因而影响乳腺癌的发生发展。