lncRNA XIST attenuates hypoxia-induced H9c2 cardiomyocyte injury by targeting the miR-122-5p/FOXP2 axis

ObjectiveTo investigate the effect of lncRNA XIST on apoptosis induced by hypoxia.MethodsWe analyzed the expression levels of lncRNA XIST and miR-122-5p using RT-qPCR in hypoxia-induced cardiomyocytes. The mechanism by which lncRNA XIST affects myocardial ischemia was investigated using the cell transfection, CCK-8, and dual-luciferase reporter assays, as well as by flowcytometry, western blotting, and RNA immunoprecipitation.ResultsHypoxic H9c2 cells demonstrated a decrease in their migration and invasion abilities and XIST expression and an increase in the extent of their apoptosis and expression of microRNA-122-5p. Overexpression of XIST significantly increased the H9c2 cell viability, enhanced cell migration and invasion, and decreased cell apoptosis in a hypoxic environment. The luciferase activity of XIST-WT in H9c2 cells co-transfected with XIST-WT and microRNA-122-5p mimics had decreased. The results of RNA immunoprecipitation showed that XIST interacted directly with miRNA-122-5p. Overexpression of XIST decreased the level of miRNA-122-5p significantly. mi-122-5p mimics increased H9c2 cell apoptosis and downregulated FOXP2 expression. Overexpression of FOXP2 upregulated the expression of the Bcl-2 protein in H9c2 cells transfected with microRNA-122-5p mimics and inhibited the expression of HIF-alpha, Bax, and the cleaved-caspase 9 protein.ConclusionlncRNA XIST could regulate the miR-122-5p/FOXP2 axis to attenuate hypoxia-induced H9c2 cardiomyocyte injury.     

Extracellular vesicle-transmitted miR-671-5p alleviates lung inflammation and injury by regulating the AAK1/NF-κB axis

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血清miR-192-5 p表达水平对儿童心脏手术后并发急性肾损伤预测价值

目的 探讨血清miR-192-5p表达水平对儿童心脏手术后并发急性肾损伤(AKI)的预测价值.方法 选取自2016年1月至2019年6月收治的行先天性心脏病体外循环手术患儿108例为研究对象.将术后并发AKI患儿纳入AKI组(n=30),未并发AKI患儿纳入非AKI组(n=78),检测两组患儿术后3 h血清miR-19...     

miR-873-5p靶向调控VDAC1保护大鼠癫痫样神经细胞的作用机制探讨

目的:研究微RNA-873-5p(miR-873-5p)靶向调控电压依赖性阴离子通道1(VDAC1)对大鼠癫痫样神经细胞的影响及作用机制。方法:通过无镁培养基诱导构建大鼠癫痫样海马神经细胞模型,将大鼠神经细胞分为对照组、模型组、miR-con组及miR-873-5p组。对照组采用正常培养大鼠神经细胞;模型组采用低镁细胞...     

Knockdown of lncRNA MALAT1 ameliorates acute kidney injury by mediating the miR‐204/APOL1 pathway

BackgroundAcute kidney injury (AKI) was characterized by loss of renal function, associated with chronic kidney disease, end‐stage renal disease, and length of hospital stay. Long non‐coding RNAs (lncRNAs) participated in AKI development and progression. Here, we aimed to investigate the roles and mechanisms of lncRNA MALAT1 in AKI.MethodsAKI serum samples were obtained from 129 AKI patients. ROC analysis was conducted to confirm the diagnostic value of MALAT1 in differentiating AKI from healthy volunteers. After hypoxic treatment on HK‐2 cells, the expressions of inflammatory cytokines, MALAT1, miR‐204, APOL1, p65, and p‐p65, were measured by RT‐qPCR and Western blot assays. The targeted relationship between miR‐204 and MALAT1 or miR‐204 and APOL1 was determined by luciferase reporter assay and RNA pull‐down analysis. After transfection, CCK‐8, flow cytometry, and TUNEL staining assays were performed to evaluate the effects of MALAT1 and miR‐204 on AKI progression.ResultsFrom the results, lncRNA MALAT1 was strongly elevated in serum samples from AKI patients, with the high sensitivity and specificity concerning differentiating AKI patients from healthy controls. In vitro, we established the AKI cell model after hypoxic treatment. After experiencing hypoxia, we found significantly increased MALAT1, IL‐1β, IL‐6, and TNF‐α expressions along with decreased miR‐204 level. Moreover, the targeted relationship between MALAT1 and miR‐204 was confirmed. Silencing of MALAT1 could reverse hypoxia‐triggered promotion of HK‐2 cell apoptosis. Meanwhile, the increase of IL‐1β, IL‐6, and TNF‐α after hypoxia treatment could be repressed by MALAT1 knockdown as well. After co‐transfection with MALAT1 silencing and miR‐204 inhibition, we found that miR‐204 could counteract the effects of MALAT1 on HK‐2 cell progression and inflammation after under hypoxic conditions. Finally, NF‐κB signaling was inactivated while APOL1 expression was increased in HK‐2 cells after hypoxia treatment, and lncRNA MALAT1 inhibition reactivated NF‐κB signaling while suppressed APOL1 expression by sponging miR‐204.ConclusionsCollectively, these results illustrated that knockdown of lncRNA MALAT1 could ameliorate AKI progression and inflammation by targeting miR‐204 through APOL1/NF‐κB signaling.     

lncRNA RPL34-AS1调控miR-670-5p/SMAD4对胃癌细胞生物学行为的影响

目的探讨lncRNA RPL34-AS1对胃癌细胞生物学行为的影响及其对miR-670-5p/SMAD4分子轴的调控作用。方法回顾性收集2018年5月至2019年6月期间临沂市肿瘤医院收治的33例胃癌患者的癌组织及其癌旁组织标本。QRT-PCR检测RPL34-AS1、miR-670-5p的表达量,蛋白质印迹法检测SMAD4表达。体外培养人胃癌细胞HGC-27,实验分组:pc DNA组(转染RPL34-AS1过表达载体的阴性对照)、pc DNA-RPL34-AS1组(转染RPL34-AS1过表达载体)、anti-miR-NC组(转染miR-670-5p特异性寡核苷酸抑制剂的阴性对照)、anti-miR-670-5p组(转染miR-670-5p特异性寡核苷酸抑制剂)、pc DNA-RPL34-AS1+miR-NC组(共转染pc DNA-RPL34-AS1与阴性对照mimic NC序列)、pc DNA-RPL34-AS1+miR-670-5p组(共转染pc DNA-RPL34-AS1与miR-670-5p寡核苷酸模拟物)。MTT与平板克隆形成实验检测细胞增殖与克隆形成数,流式细胞术检测细胞凋...     

miR-101-3p and miR-199b-5p promote cell apoptosis in oral cancer by targeting BICC1

microRNAs (miRNAs) are involved in the carcinogenesis and progression of oral cancer. In this research, we aimed to identify the DE_miRNAs in oral cancer and the related molecular mechanisms. Using the GEO2R online tool, we identified 19 DE_miRNAs from the GSE115117 dataset and 3343 the DEGs from GSE74530 dataset. GO enrichment analysis of DE_miRNAs were performed using FunRich online analysis. Venn diagrams of the overlapping genes regulated by miR-204-5p, miR-199b-5p, and miR-101-3p were constructed using Draw Venn Diagram, FunRich, miRDB, TargetScan and GSE74530 databases. Cytoscape was used to construct a miRNAs-mRNAs network. RT-PCR and western blotting showed downregulation of miR-199b-5p and miR-101-3p, and upregulation of BICC1 in oral cancer cell lines and tissues. Spearman correlation analysis further demonstrated a positive correlation between miR-101-3p and miR-199b-5p levels and that miR-199b-5p and miR-101-3p were negatively correlated with BICC1 mRNA levels. miR-199b-5p and BICC1 were significantly related to survival rate of patients with oral cancer. Upregulation of miR-199b-5p and miR-101-3p inhibited the viability and promoted the apoptosis in TSCCA and SCC-9 cells, as shown by the CCK8 assay and flow cytometry analysis, respectively. Inhibition of BICC1 reduced viability and promoted apoptosis in TSCCA cells. Additionally, the relationship between BICC1 and both miR‐101-3p and miR-199b-5p was assessed by a luciferase reporter assay. The effects of miR-101-3p and miR-199b-5p upregulation on the promotion of cell apoptosis and the inhibition of tumor growth were reversed by overexpression of BICC1. In conclusion, the increased levels of miR-199b-5p and miR-101-3p enhanced apoptosis and suppressed cell viability in oral cancer by suppressing BICC1 expression.