Circulating miR-29c-3p is downregulated in patients with acromegaly

Background/aimmiRNAs control various biological functions, such as cell proliferation, differentiation, signaling pathways, apoptosis and metabolism. Recently, it has been shown that there is a relationship between changes in miRNA expression and the development of acromegaly. Studies are needed to identify new disease-specific miRNAs. The aim of the current study is to evaluate plasma miR-29c-3p, miR-31-5p and miR-18a-5p steady-state levels in acromegaly. Another aim is to investigate whether there is a difference in the levels of these miRNAs in patients with inadequate control and controlled acromegaly with somatostatin analog (SSA) therapy. These miRNAs targeting the IGF-1 gene were determined by in silico estimation.Materials and methodsThe study included 30 healthy controls (HC) and 20 patients with acromegaly. Anterior pituitary functions and disease activities of patients with acromegaly were evaluated at the time of study. The miR-29c-3p, miR-31-5p and miR-18a-5p levels were measured using quantitative real-time PCR (RT-qPCR).ResultsThe expression level of miR-29c-3p was significantly lower in patients with acromegaly compared to the HC group (p < 0.001). This downregulation was more pronounced in patients with inadequately controlled acromegaly than in patients with acromegaly controlled with somatostatin analogues (SSA) therapy (p = 0.016). Univariate logistic regression analysis results showed that down regulation of miR-29c-3p expression increases the risk of developing acromegaly [OR (95% Cl) = 1.605 (1.142-2.257), p = 0.006]. There was no significant difference between the groups in terms of miR-31-5p and miR-18a-5p expression levels (p = 0.375 and p = 0.649, respectively). ConclusionPlasma miR-29c-3p expression level is downregulated in patients with acromegaly, and this is more pronounced in patients with inadequate control.     

LncRNA TSIX promotes osteoblast apoptosis in particle-induced osteolysis by down-regulating miR-30a-5p

Objective: This study aims to investigate the role of TSIX/miR-30a-5p axis in particle-induced osteolysis (PIO).

Method: PIO mouse model was established by the implantation of Co-Cr-Mo metal particles (CoPs). MC3T3-E1 cells received CoPs stimulation. Bone mineral density (BMD) in the skull was detected to evaluate PIO development. The expression of TSIX and miR-30a-5p was detected by using qRT-PCR. Osteoblast apoptosis was measured using flow cytometry. RNA pull-down was used to verify the regulatory relationship between TSIX and miR-30a-5p.

Result: The results showed that BMD of the skull in PIO mice was significantly decreased compared with control mice, which indicated that the PIO model was established successfully. Moreover, CoPs could up-regulate TSIX level, down-regulate miR-30a-5p expression, and promote osteoblast apoptosis in vivo and in vitro. The results also found that TSIX negatively regulated miR-30a-5p expression, and knockdown of TSIX inhibited Runx2 expression. As expected, miR-30a-5p inhibitor could reverse the inhibition of si-TSIX on osteoblast apoptosis.

Conclusion: TSIX played a pivotal role in PIO development by negatively regulating miR-30a-5p.     

Circular RNA circEGFR regulates tumor progression via the miR-106a-5p/DDX5 axis in colorectal cancer

Recently, an increasing number of studies have reported that dysregulation of circular RNA (circRNA) expression plays critical roles in the progression of several cancers, including colorectal cancer (CRC). However, the detailed molecular mechanisms of circRNAs involvement in CRC remain largely unknown. Here, we confirmed that the level of circEGFR was significantly increased in CRC tissues compared to matched adjacent non-tumor tissues, and a high level of circEGFR was correlated with poor clinicopathological characteristics and poor prognosis in patients with CRC. Moreover, increased circEGFR expression promoted CRC cell proliferation, migration, and invasion in vitro. Mechanistically, circEGFR acted as a ceRNA for miR-106a-5p to relieve the repressive effect of miR-106a-5p on DDX5 mRNA. Moreover, circEGFR enhanced DDX5 expression, thereby upregulating p-AKT levels. Together, these findings showed that circEGFR promoted CRC cell proliferation, migration, and invasion through the miR-106a-5p/DDX5/AKT axis, and may serve as a promising diagnostic marker and therapeutic target for CRC patients.     

卵巢癌患者miR-497、miR-125a-5p的表达及与其临床特征和生存率的关系

目的:分析卵巢癌患者癌组织中微小RNA-497(miR-497)和微小RNA-125a-5p(miR-125a-5p)的表达情况及其临床意义.方法:选取2018-06—2019-12在本院手术治疗的96例卵巢癌患者作为研究对象,将手术切除的卵巢癌组织作为试验组,癌旁(>2cm)正常组织为对照组.采用实时荧光定量PCR(...     

miR-15a-5p抑制人肝癌SMMC-7721细胞增殖与迁移

目的:观察高表达的miR-15a-5p对人肝细胞癌SMMC-7721细胞增殖和迁移能力的影响。方法:化学合成加入EcoRⅠ和HindⅢ酶切位点的miR-15a-5p寡聚核苷酸,并进行测序确认;利用pcDNA6.2-GW/EmGFP质粒构建miR-15a-5p真核表达载体,瞬时转染SMMC-7721细胞,实时荧光定量PCR检测miR-15a-5p的表达;CCK-8法和台盼蓝染色活细胞计数检测SMMC-7721细胞的增殖能力,划痕实验检测细胞迁移能力的变化。结果:设计的miR-15a-5p序列与寡核苷酸测序结果匹配达100%;真核表达质粒瞬转后人肝癌SMMC-7721细胞miR-15a-5p的表达量与对照组相比显著增加(P0.05);miR-15a-5p高表达SMMC-7721细胞的增殖能力与对照组相比均显著下降(P0.05);miR-15a-5p高表达组细胞迁移速度低于对照组。结论:高表达的miR-15a-5p可抑制人肝癌SMMC-7721细胞的增殖和迁移能力。     

下调miR-199a-5p对阿霉素诱导的心肌细胞凋亡的影响和机制研究

目的:探讨下调miR-199a-5p对阿霉素诱导的心肌细胞凋亡的影响和机制。方法:将心肌细胞H9C2分成Control组(常规培养的对照细胞)、DOX组(经含1μM阿霉素的细胞培养液培养)、DOX+Anti-miR-NC组(转染inhibitor control,经含1μM阿霉素的细胞培养液培养)和DOX+Anti-miR-199a-5p组(转染miR-199a-5p inhibitor,经含1μM阿霉素的细胞培养液培养)、DOX+Anti-miR-199a-5p+DKK1组(转染miR-199a-5p inhibitor,经含1μM阿霉素和20ng/ml的Wnt/β-catenin信号抑制剂DKK1的细胞培养液培养)。各组细胞处理24h以后,Realtime PCR测定miR-199a-5p表达,CCK-8测定细胞增殖,流式细胞术测定细胞凋亡,Western blot测定C-Caspase-3、β-catenin、c-Myc蛋白表达。结果:与Control组比较,DOX组细胞中miR-199a-5p水平升高,细胞增殖活性下降,细胞凋亡和C-Caspase-3蛋白表达水平升高,β-catenin、c-Myc蛋白表达水平降低(P均<0.01)。与DOX+Anti-miR-NC组比较,DOX+Anti-miR-199a-5p组细胞中miR-199a-5p水平降低,细胞增殖活性升高,细胞凋亡水平和C-Caspase-3蛋白表达水平降低,β-catenin、c-Myc蛋白表达水平升高(P均<0.01)。与DOX+Anti-miR-199a-5p组相比,DOX+Anti-miR-199a-5p+DKK1组心肌细胞存活率降低,细胞凋亡率升高,细胞中C-Caspase-3蛋白表达水平升高,β-catenin、c-Myc蛋白表达水平降低(P均<0.01)。结论:下调miR-199a-5p通过激活Wnt/β-catenin信号抑制阿霉素诱导的心肌细胞凋亡。     

Detection of circulating exosomal miR-17-5p serves as a novel non-invasive diagnostic marker for non-small cell lung cancer patients

Exosome-shuttled bioactive miRNAs act as novel non-invasive biomarkers for cancer diagnosis have received increasing attention. In this study, we aimed to investigate the expression signatures of exosomal miRNAs and develop a serum exosome-derived miRNA panel for diagnosis of non-small cell lung cancer (NSCLC). The miR-17-92 cluster including 6 miRNAs (miR-17-5p, miR-18a-5p, miR-19a-3p, miR-19b-1-5p, miR-20a-5p and miR-92a-1-5p) was selected as potential diagnostic candidate molecule. Then, expression profiles of the candidate miRNAs were firstly analyzed in 43 pairs of serum samples from the training set by quantitative real-time PCR, and the dysregulated miRNA along with three tumor markers (carcinoembryonic antigen, CEA; cytokeratin 19 fragment, CYFRA21-1; squamous cell carcinoma antigen, SCCA) were further validated in two independent cohorts, which consisted of training set (including 100 NSCLC patients and 90 healthy controls) and validation set (including 72 NSCLC patients and 47 healthy controls). The expression of miR-17-5p was significantly up-regulated in NSCLC patients compared with the healthy controls (P < 0.001), suggesting that miR-17-5p might have considerable clinical value in the diagnosis of NSCLC. Based on the data from the training set, we next used a logistic regression model to construct a 4-molecule panel consisting of miR-17-5p and three tumor markers for NSCLC diagnosis. The performance of such 4-molecule panel was verified with an area under the ROC curve of 0.860 (95% CI = 0.802 to 0.906, sensitivity = 63.0% and specificity = 93.3%) and 0.844 (95% CI = 0.766 to 0.904, sensitivity = 76.4% and specificity = 76.6%) in the training set and validation set, respectively. In conclusion, the newly developed diagnostic panel consisting of exosomal miR-17-5p, CEA, CYFRA21-1 and SCCA may have considerable clinical value in the diagnosis of NSCLC.     

miR-424-5p promotes the proliferation and metastasis of colorectal cancer by directly targeting SCN4B

BackgroundColorectal cancer (CRC) is one of the most common malignancies worldwide usually diagnosed at advanced stages which causes poor prognosis of patients. Therefore, novel diagnostic biomarkers and therapeutic targets are urgently needed.Materials and methodsmiR-424-5p was identified through integrated analysis of three public databases. Loss-of-function experiments in HT29 and SW480 cells and mouse xenograft models were performed to explore the regulatory role of miR-424-5p in CRC. Bioinformatics analysis was used for predicting targets of miR-424-5p and its functional and pathway enrichment analysis.ResultsmiR-424-5p expression was significantly upregulated in CRC tissues and cell lines and associated with prognosis of CRC patients. Experiments in vitro and in vivo showed miR-424-5p promotes CRC cell proliferation and metastasis by directly inhibiting SCN4B. Besides, CRC cells secret miR-424-5p into peripheral blood through exosomes and circulating exosomal miR-424-5p could discriminate CRC patients with early stage from healthy people with AUC value of 0.82.ConclusionsmiR-424-5p serves as an oncogene in CRC and circulating exosomal miR-424-5p is a novel potential diagnostic biomarker of CRC patients.     

微小RNA-199a-5p通过靶向SIRT1促进心肌纤维化相关基因表达

目的:研究微小RNA-199a-5p(miR-199a-5p)对心肌成纤维细胞中纤维化相关基因表达的调控作用及其可能作用的靶基因。方法:原代分离并体外培养成体C57BL/6小鼠心肌成纤维细胞;双萤光素酶报告基因实验检测miR-199a-5p与潜在靶基因沉默信息调节因子1(SIRT1)3’端非翻译区(3’-UTR)的结合作用;实时荧光定量PCR(RT-q PCR)和Western blot法分别检测SIRT1以及纤维化标志物胶原蛋白(Col)1a1、Col3a1和α-平滑肌肌动蛋白(α-SMA)的mRNA和蛋白表达。结果:在血管紧张素Ⅱ(AngⅡ)诱导的小鼠心肌成纤维细胞中,Col1a1、Col3a1和α-SMA的表达增强,miR-199a-5p表达上调。在心肌成纤维细胞中过表达miR-199a-5p可以增强Col1a1、Col3a1和α-SMA的表达。双萤光素酶报告基因实验显示miR-199a-5p与SIRT1 3’-UTR有结合作用。RT-q PCR和Western blot结果证实miR-199a-5p可在转录水平抑制SIRT1表达。过表达miR-199a-5p和沉默SIRT1均能一致性促进心肌成纤维细胞中Col1a1、Col3a1和α-SMA的表达。抑制AngⅡ诱导的小鼠心肌成纤维细胞中NF-κB激活,可显著降低miR-199a-5p表达。结论:SIRT1是miR-199a-5p的作用靶基因,并介导miR-199a-5p促进纤维化标志物Col1a1、Col3a1和α-SMA的表达。     

CircRNA has_circ_0001806 promotes hepatocellular carcinoma progression via the miR-193a-5p/MMP16 pathway

Reportedly, circular RNAs (circRNAs) are crucial regulators in cancer progression. Nonetheless, the molecular mechanism of circRNAs in hepatocellular carcinoma (HCC) has not been fully clarified. Gene expression omnibus (GEO) database was employed to screen out the differentially expressed circRNAs in HCC. qRT-PCR and western blot were executed to detect circ_0001806 expression, miR-193a-5p expression, and MMP16 mRNA and protein expressions in HCC. The effect of circ_0001806 on HCC was analyzed by the CCK-8 method and Transwell experiment. RIP assay, pull-down experiment, and dual-luciferase reporter gene experiment were applied to validate the targeting relationships among circ_0001806, miR-193a-5p, and MMP16. Circ_0001806 was up-modulated in HCC tissues and cell lines. Knockdown of circ_0001806 impeded the multiplication, migration, and invasion of HCC cells. Circ_0001806 could up-regulate MMP16 expression through repressing miR-193a-5p, thereby facilitating the malignant biological behaviors of HCC. Circ_0001806 promoted HCC progression by regulating miR-193a-5p/MMP16 axis.     

靶向调控c-SKI的microRNA的筛选及验证

目的筛选和验证靶向调控c-SKI并与纤维化相关的microRNA(miRNA)。方法生物信息学方法预测并结合文献报道,筛选出靶向c-SKI的候选miRNAs,RT-qPCR检测人心肌成纤维细胞(HCFBs)中候选miRNAs和c-SKI的表达,筛选出抑制作用最显著的miRNA;构建c-SKI-3′-UTR野生型(c-SKI-wt)和突变型(c-SKI-mut)载体,分别与miR-155a-5p/miR-17a-5p的模拟物、抑制剂及对照在人胚肾上皮细胞(HEK293T)中共转染,双萤光素酶报告系统检测各组荧光素酶活性;接着,分别将miR-155a/miR-17a-5p mimics和inhibitor转染至人心肌成纤维细胞(HCFBs),Western blot检测各组细胞c-SKI的表达。结果 1)经筛选miR-155a-5p和miR-17a-5p对c-SKI的抑制作用最明显(P<0.01);2)与NC组相比,miR-155a-5p/miR-17a-5p mimics组萤光素酶活性均显著下降(P<0.05),miR-155a-5p/miR-17a-5p inhibitor组萤光素酶活性均明显增强(P<0.05);3)与NC组相比,miR-155a-5p/miR-17a-5p mimics组中c-SKI蛋白表达显著下调,miR-155a-5p/miR-17a-5p inhibitor组中c-SKI的表达显著上调(P<0.01)。结论 miR-155a-5p和miR-17a-5p可分别靶向结合c-SKI的3′-UTR,在HCFBs中负性调控c-SKI的表达。     

miR-203a-3p promotes loureirin A-induced hair follicle stem cells differentiation by targeting Smad1

MicroRNAs (miRNAs) participate in the repair of skin trauma. Our previous study indicated that loureirin A promoted hair follicle stem cells (HFSCs) to repair skin epidermis. However, the mechanism of miRNA-mediated regulation of loureirin A-induced HFSC differentiation remained to be explored. In the present study, HFSCs from rat vibrissa were identified by immunofluorescence in vitro. Microarray and quantitative real time polymerase chain reaction analyses demonstrated that miR-203a-3p was upregulated in differentiated HFSCs induced by loureirin A. The expression of cytoskeletal keratin (CK) 5 and involucrin was promoted by miR-203a-3p mimics while repressed by a miR-203a-3p inhibitor. Smad1 was identified as a key target of miR-203a-3p using target prediction tools. Luciferase reporter gene test confirmed a special target association between miR-203a-3p and Smad1. Short interfering Smad1 was transfected into HFSCs, and the expression levels of CK5 and involucrin were upregulated. Thus, it can be inferred that miR-203a-3p negatively regulated the expression of Smad1 and promoted the differentiation of loureirin A-induced HFSCs. Bone morphogenetic protein (BMP) signal inhibition and Wnt activation coregulate skin injury repair. BMP/Smad1 signaling is involved in maintaining the characteristics of HFSCs and inhibiting their differentiation. Our results showed that miR-203a-3p reduces Smad1 to release BMP inhibition. Taken together, miR-203a-3p/Smad1 is a potential therapeutic molecular target in skin wound healing, and may play an active role in wound repair and regenerative medicine.     

DNM3OS Facilitates Ovarian Cancer Progression by Regulating miR-193a-3p/MAP3K3 Axis

PurposeLong non-coding RNAs (lncRNAs) are essential regulators in the development of ovarian cancer (OC). Nonetheless, the function of lncRNA DNM3 opposite strand/antisense RNA (DNM3OS) in OC remains unclear. This work aimed to investigate the biological roles and underlying mechanisms of DNM3OS in OC.Materials and MethodsQuantitative real-time polymerase chain reaction was conducted to examine DNM3OS, microRNA (miR)-193a-3p, and mitogen-activated protein kinase 3 (MAP3K3) mRNA expression in OC tissues and cell lines. Kaplan-Meier survival analysis was employed to analyze the relationship between DNM3OS expression and the prognosis of OC patients. Cell counting kit-8, 5-ethynyl-2′-deoxyuridine, and transwell experiments were conducted to monitor cell proliferation, migration, and invasion, respectively. Western blot was applied to examine epithelial-mesenchymal transition associated protein (E-cadherin and N-cadherin) expression. Luciferase reporter gene and RNA immunoprecipitation experiments were performed to confirm the relationships among DNM3OS, miR-193a-3p, and MAP3K3. Pearson''s correlation analysis was adopted to analyze the correlations among DNM3OS, miR-193a-3p, and MAP3K3 mRNA.ResultsDNM3OS expression was remarkably increased in OC tissues and cell lines, which was associated with the unfavorable prognosis of the patients. DNM3OS overexpression enhanced OC cell proliferation, migration, and invasion; suppressed E-cadherin protein expression; and facilitated N-cadherin protein expression, while the transfection of miR-193a-3p mimics had the opposite effects. DNM3OS directly interacted with miR-193a-3p, and miR-193a-3p targeted MAP3K3 by directly binding to 3′UTR. DNM3OS could up-regulate the expression of MAP3K3 via repressing miR-193a-3p expression.ConclusionDNM3OS, as an oncogenic lncRNA, increases the malignancy of OC cells via regulation of an miR-193a-3p/MAP3K3 axis.     

过表达miR-130a-3p对心肌细胞肥大的缓解作用研究

本研究旨在探索miR-130a-3p对心肌细胞肥大的作用及其可能机制。通过胸主动脉缩窄法(TAC)构建压力超负荷所致心肌肥厚小鼠模型。使用去甲肾上腺素(NE)刺激SD乳鼠原代心肌细胞(NRCMs)及H9c2大鼠心肌细胞系,诱导这两种心肌细胞发生肥大表型转变。检测miR-130a-3p的表达变化,并进一步探索其对心肌细胞肥大是否有调控作用。结果表明,miR-130a-3p在肥厚心肌组织、肥大NRCMs及H9c2细胞中的表达均明显降低。给予miR-130a-3p mimics使其过表达后,H9c2细胞中肥大标志基因心房利钠肽(ANP)、脑利钠肽(BNP)和肌球蛋白重链β(β-MHC)的表达较对照组(mimics N.C.+NE组)明显下调,且细胞面积明显减小。而给予miR-130a-3p inhibitor抑制其表达后,肥大心肌细胞中ANP、BNP、β-MHC的表达进一步上升,且细胞面积进一步增加。Western blot检测发现,过表达miR-130a-3p后心肌细胞中磷酸化Akt和磷酸化mTOR的表达水平下调。以上结果提示,miR-130a-3p mimics可缓解心肌细胞肥大的程度;其inhibitor则可使心肌细胞肥大进一步加剧。过表达miR-130a-3p可能通过影响Akt通路来缓解H9c2心肌细胞肥大的程度。     

miR-26a-5p调控MCL-1在孕产妇子痫前期中表达的临床意义

目的:探讨microRNA-26a-5p(miR-26a-5p)调控髓细胞白血病因子1(myeloid cell leukemia-1,MCL-1)表达在孕产妇子痫前期发生发展中的临床意义。方法:收集正常妊娠21例、妊娠期高血压孕产妇13例、轻度子痫前期15例和重度子痫前期26例共4组孕产妇血浆及胎盘组织,用real-time PCR分析其血浆及胎盘组织中miR-26a-5p及胎盘组织中MCL-1 mRNA的表达,Western blotting分析胎盘组织中MCL-1蛋白的表达,并分析其表达的临床意义。结果:随着病情进展,miR-26a-5p在孕产妇血浆和胎盘中表达逐步增高(P0.01),而其胎盘组织中MCL-1 mRNA的表达明显降低(P0.01),二者呈明显负相关(P0.01);胎盘组织中miR-26a-5p与MCL-1蛋白表达呈明显负相关(P0.01)。孕产妇血浆及胎盘组织中miR-26a-5p表达上调与孕龄、孕妇血浆白蛋白水平及胎儿体重呈明显负相关,而与孕产妇血压和尿蛋白水平呈明显正相关(P0.01),胎盘组织中MCL-1表达下调与此相反。结论:miR-26a-5p高表达通过下调MCL-1的表达参与子痫前期的发生与发展。     

用双萤光素酶报告基因技术验证小鼠lncRNA-H19与miR-199a-5p的靶向关系

目的:构建长链非编码RNA-H19(lncRNA-H19)萤光素酶报告质粒,利用双萤光素酶报告基因技术验证小鼠lncRNA-H19与微小RNA-199a-5p(miR-199a-5p)的靶向关系。方法:通过生物信息学网站RegRNA2.0预测获取小鼠lncRNA-H19与miR-199a-5p潜在的互补结合位点。将H19及其突变体克隆到萤光素酶载体psi CHECK-2中,构建H19野生型和突变型质粒,并采用酶切和测序方法鉴定psi CHECK-2-H19载体是否构建成功。将H19野生型和突变型质粒分别与miR-199a-5p模拟物、miR-199a-5p抑制剂、miR-199a-5p模拟物阴性对照或miR-199a-5p抑制剂阴性对照在293T细胞中共转染。收集细胞后通过双萤光素酶报告系统检测不同组别的萤光素酶活性,从而对lncRNA-H19与miR-199a-5p的靶向调节关系进行验证。结果:构建的重组萤光素酶报告质粒经酶切及测序鉴定正确,双萤光素酶报告基因检测显示,与miR-199a-5p模拟物阴性对照组相比,miR-199a-5p模拟物组H19野生型报告基因的萤光素酶活性显著降低,下降约49%左右(P0.01),而miR-199a-5p抑制剂组H19野生型报告基因的萤光素酶活性较miR-199a-5p模拟物组明显增高(P0.01)。miR-199a-5p模拟物、miR-199a-5p抑制剂、miR-199a-5p模拟物阴性对照以及miR-199a-5p抑制剂阴性对照对H19突变型的萤光素酶活性均无明显影响。结论:lncRNA-H19能够靶向结合miR-199a-5p,并在转录后水平对其有直接抑制作用。