miR-155对肝癌细胞增殖的影响

目的:在肝癌细胞系中过表达miR-155,研究其对肝癌细胞增殖的影响。方法:将pc DNA3.0-miR-155表达载体瞬时转染Huh7.5.1及Hcclm3肝癌细胞系,通过实时定量PCR技术对miR-155在转录水平的表达进行检测,采用CCK8法及克隆形成实验检测miR-155过表达后对Huh7.5.1及Hcclm3肝癌细胞系增殖的影响。结果:转染细胞后72 h,经实时定量PCR检测,Huh7.5.1及Hcclm3肝癌细胞中成熟miR-155的表达分别上调约431及16倍(P0.01),说明其能有效高表达;CCK8法及克隆形成实验结果显示,miR-155能够明显促进肝癌细胞增殖(P0.01)。结论:pc DNA3.0-miR-155转染Huh7.5.1及Hcclm3肝癌细胞系后能高效表达成熟miR-155,同时证明过表达miR-155能使肝癌细胞的增殖受到非常明显的促进。     

lncRNA PSMA3-AS1靶向调控miR-627-3p对肝癌Hep3B细胞增殖、迁移及侵袭的影响

该文旨在探讨lncRNA PSMA3-AS1对肝癌细胞增殖、迁移及侵袭的影响及其可能的作用机制。采用qRT-PCR法对肝癌组织、癌旁组织、正常人肝上皮细胞THLE-3,以及人肝癌细胞MHCC97H、Hep3B、SK-HEP-1中lncRNA PSMA3-AS1、miR-627-3p的表达量进行检测;将si-NC、si-lncRNA PSMA3-AS1、miR-NC、miR-627-3p mimics分别转染至Hep3B细胞,si-lncRNA PSMA3-AS1与anti-miR-NC,以及si-lncRNA PSMA3-AS1与anti-miR-627-3p共转染至Hep3B细胞;双荧光素酶报告实验检测lncRNA PSMA3-AS1与miR-627-3p的靶向关系;MTT法检测细胞增殖;平板克隆形成实验检测细胞克隆形成情况;Transwell实验检测细胞迁移及侵袭;蛋白质印迹法检测MMP2、MMP9蛋白表达量。qRT-PCR实验结果显示,与癌旁组织比较,肝癌组织中lncRNA PSMA3-AS1的表达量升高(P<0.05),miR-627-3p的表达量降低(P<0.05...     

miR-92a-3p和miR-25-3p海绵上调Kiss1并影响雌性小鼠的青春期启动及动情周期

下丘脑Kiss1神经元产生的神经肽kisspeptin通过影响促性腺激素释放激素的分泌,参与青春期的启动、生殖系统的成熟以及排卵等过程的神经内分泌调节.Kiss1基因的表达受到包括多种反式调控因子及表观遗传的调控.预测与前期研究表明,miR-92a-3p、miR-25-3p的种子序列能够与Kiss1的3'-UTR直接结...     

miR-374b-5p靶向调控UHMK1对前列腺癌PC-3细胞的影响

[目的]探讨miR-374b-5p调控UHMK1表达对前列腺癌PC-3细胞增殖、迁移及凋亡的作用。[方法]萤光霉素报告检测miR-374b-5p对UHMK1的调控作用,将miR-NC、miR-374b-5p inhibitor和miR-374b-5p mimic转染到前列腺癌PC-3细胞。采用CCK-8法检测细胞存活率,改良的Matrigel Boyden室测定对细胞的侵袭性实施检测,划痕实验对细胞的具体迁移力实施检测,流式细胞术检测细胞凋亡率,RT-qPCR检测miR-374b-5p和UHMK1 mRNA表达,Western Bloting检测UHMK1蛋白表达。[结果]与对照组比较,miR-374b-5p inhibitor组细胞存活率、迁移率、侵袭数、miR-374b-5p表达水平、UHMK1 mRNA表达和蛋白表达水平显著降低,细胞凋亡率显著升高(P<0.05);miR-374b-5p mimic组细胞存活率、迁移率、侵袭数、miR-374b-5p表达水平、UHMK1 mRNA表达和蛋白表达水平显著降低,细胞凋亡率显著降低(P<0.05)。与miR-374b-5p ...     

miR-486-5p对C2C12细胞IGF-1-PI3K/AKT-mTOR信号通路的影响

本文旨在研究miR-486-5p对C2C12细胞IGF-1-PI3K/AKT-mTOR信号通路的影响,探讨miR-486-5p在C2C12细胞中对胰岛素信号通过基因的调控机制.利用构建好的miR-486-5p过表达和抑制慢病毒载体,通过脂质体转染法分别在C2C12细胞上过表达和抑制miR-486-5p的表达,利用荧光定...     

miR-195-5p调节TGF-β1/Smad3信号通路对心力衰竭大鼠心肌细胞的影响

[目的]观察miR-195-5p调节TGF-β1/Smad3信号通路对心力衰竭(HF)大鼠心肌细胞的影响.[方法]将80只SD大鼠随机分为对照组、HF组、miR-195-5p-agomir组、miR-NC组,每组各20只,阿霉素建立HF大鼠模型.比较心功能、心肌细胞miR-195-5p表达、心肌细胞凋亡及凋亡相关蛋白、...     

miR-659-3p靶向CTNNBIP1调控甲状腺癌细胞凋亡的机制

[目的]探讨miR-659-3p在甲状腺癌细胞中的潜在功能和机制。[方法]纳入甲状腺乳头癌患者60例,比较甲状腺患者癌旁组织和癌组织中miR-659-3p的表达水平。过表达或敲低miR-659-3p后检测甲状腺癌细胞TPC-1的增殖水平和凋亡水平,并进行底物鉴定。[结果] miR-659-3p的表达水平在60个甲状腺癌组织中也显著上调(P<0.05)。miR-659-3p敲低后TPC-1的增殖水平显著下降(P<0.05)、 TPC-1的凋亡水平显著上升(P<0.05)。敲低CTNNBIP1时,TPC-1的凋亡水平下降(P<0.05)、 TPC-1的细胞活力水平上升(P<0.05)。过表达miR-659-3p时,CTNNBIP1的蛋白水平和mRNA水平显著下降(P<0.05);敲低miR-659-3p时,CTNNBIP1的蛋白水平和mRNA水平显著上升(P<0.05)。过表达miR-659-3p后,Wnt/β-catenin通路的关键蛋白β-catenin的核定位增多;敲低miR-659-3p后,β-catenin的核定位减少。[结论] miR-...     

miR-490-3p通过靶向调控TGFBR1抑制非小细胞肺癌细胞的增殖和侵袭

目的:以非小细胞肺癌A549细胞为模型,探讨miR-490-3p在肺癌发生发展过程中的作用及其调控机制。方法:通过miRBase数据库获得miR-490-3p序列,设计miR-490-3pmimics并转染A549细胞,CCK8、细胞划痕及Transwell实验分别检测miR-490-3p过表达对A549细胞增殖、迁移和侵袭能力的影响;使用miRwalk在线工具预测miR-490-3p可能的调控基因,通过实时荧光定量PCR及Western印迹对候选调控基因进行筛选,最后通过双萤光素酶报告基因实验验证miR-490-3p与调控基因之间的靶向关系。结果:过表达miR-490-3p可显著抑制A549细胞的增殖、侵袭和迁移能力;在预测的miR-490-3p候选靶基因中,选择与细胞增殖、迁移等表型相关的RASAL2、TGFBR1、PAPPA、HMGA2、TGFA靶基因进行实时荧光定量PCR及Western印迹筛选,结果仅TGFBR1基因在mRNA和蛋白水平的表达与miR-490-3p水平呈负相关,且双萤光素酶报告实验证实miR-490-3p可直接与TGFBR1的3'-UTR结合并抑制其表达。结论:miR-490-3p通过靶向调控TGFBR1的表达抑制非小细胞肺癌A549细胞的增殖和侵袭。     

lncRNA CEBPA-AS1靶向miR-455-3p调控胃癌细胞生物学行为的分子机制研究

摘要 目的：探讨lncRNA CEBPA-AS1对胃癌细胞生物学行为的影响及其可能作用机制。方法：qRT-PCR法检测胃癌组织、癌旁组织与正常人胃上皮GES1细胞和人胃癌SNU-1、AGS、HS-746T细胞系中lncRNA CEBPA-AS1、miR-455-3p的表达量。si-NC、si-lncRNA CEBPA-AS1、miR-NC、miR-455-3p mimics、si-lncRNA CEBPA-AS1与anti-miR-NC、si-lncRNA CEBPA-AS1与anti-miR-455-3p分别转染至SNU-1细胞（分别命名为si-NC组、si-lncRNA CEBPA-AS1组、miR-NC组、miR-455-3p组、si-lncRNA CEBPA-AS1+anti-miR-NC组和si-lncRNA CEBPA-AS1+anti-miR-455-3p组）后,MTT实验与平板克隆形成实验分别检测细胞增殖及克隆形成能力,Transwell小室实验检测细胞迁移及侵袭能力,双荧光素酶报告基因实验与qRT-PCR实验验证lncRNA CEBPA-AS1与miR-455-3p的靶向调控关系,Western blot法检测MMP2、MMP9蛋白表达情况。结果：与癌旁组织比较,胃癌组织中lncRNA CEBPA-AS1的表达量显著升高,miR-455-3p的表达量显著降低,差异均有统计学意义（均P＜0.05）。与GES1细胞比较,SNU-1、AGS、HS-746T细胞中lncRNA CEBPA-AS1的表达量显著升高,miR-455-3p的表达量显著降低,其中SNU-1细胞的lncRNA CEBPA-AS1表达量最高,差异均有统计学意义（均P＜0.05）。与si-NC组比较,si-lncRNA CEBPA-AS1组细胞活力降低,细胞克隆形成数、迁移及侵袭细胞数减少,MMP2、MMP9蛋白表达水平降低,差异均有统计学意义（P＜0.05）。与miR-NC组比较,miR-455-3p组细胞活力降低,细胞克隆形成数、迁移及侵袭细胞数减少,MMP2、MMP9蛋白表达水平降低,差异均有统计学意义（P＜0.05）。lncRNA CEBPA-AS1可靶向结合miR-455-3p,并可负调控miR-455-3p的表达。与si-lncRNA CEBPA-AS1+anti-miR-NC组比较,si-lncRNA CEBPA-AS1+anti-miR-455-3p组细胞活力升高,细胞克隆形成数、迁移及侵袭细胞数增多,MMP2、MMP9蛋白表达水平升高,差异均有统计学意义（P＜0.05）。结论：干扰lncRNA CEBPA-AS1表达可通过靶向调控miR-455-3p而抑制胃癌细胞增殖、克隆形成、迁移及侵袭。     

circNEIL3靶向miR-218-5p对口腔鳞状细胞癌细胞增殖、凋亡、迁移、侵袭的影响

该文旨在探讨circNEIL3对口腔鳞癌细胞生物学行为的影响及其可能的作用机制。采用qRT-PCR法检测口腔鳞癌组织、癌旁组织、人口腔鳞癌细胞(CAL-27、SCC-25、SCC-9、HSC-3)以及正常口腔角质细胞HOK中circNEIL3、miR-218-5p的表达量;以CAL-27细胞为研究对象,si-circNEIL3、miR-218-5p mimics、si-NC、miR-NC分别转染至CAL-27细胞, si-circNEIL3和antimiR-NC、si-circNEIL3和anti-miR-218-5p分别共转染至CAL-27细胞; MTT法检测CAL-27细胞增殖情况;流式细胞术检测CAL-27细胞凋亡情况; Transwell检测CAL-27细胞侵袭和迁移情况。双荧光素酶报告实验检测circNEIL3与miR-218-5p的靶向关系; Western blot检测Bax、Bcl-2、caspase-3、cleaved-caspase-3蛋白表达量。与癌旁组织相比,口腔鳞癌组织中circNEIL3的表达量升高(P<0.01),miR-218-5p的表达量降低(P...     

miR-155-5p regulates mesenchymal stem cell osteogenesis and proliferation by targeting GSK3B in steroid-associated osteonecrosis

microRNAs (miRNAs) have recently been recognized as playing an important role in bone-associated diseases. This study investigated whether the reduced miR-155-5p in steroid-associated osteonecrosis of the femoral head (ONFH) attenuated osteogenic differentiation and cell proliferation by targeting GSK3B. Bone marrow was collected from the proximal femurs of patients with steroid-associated ONFH (n = 10) and patients with new femoral neck fracture (n = 10) and mesenchymal stem cells (MSCs) were isolated. The expression profile, the biological function of miR-155-5p, and the interaction between miR-155-5p and GSK3B were investigated by cell viability measurement, western blot, real-time polymerase chain reaction, luciferase reporter assay, and Alizarin Red S (ARS) staining of MSCs. The MSCs that were obtained from the femoral neck fracture group and from the steroid-associated ONFH group were transfected with or without miR-155-5p. We found that, in ONFH samples, the level of mature miR-155-5p was significantly lower than that of control samples. By inhibiting GSK3B, miR-155-5p promoted the nuclear translocation of β-catenin, increased the expression of osteogenesis-related genes, and facilitated the proliferation and differentiation of MSCs. Restoring the expression of GSK3B in MSCs partially reversed the effect of miR-155-5p. These findings suggest that reduced miR-155-5p in steroid-associated ONFH attenuates osteogenic differentiation and cell proliferation by increased levels of GSK3B and inhibition of Wnt signaling.     

UHRF1 is regulated by miR-124-3p and promotes cell proliferation in intrahepatic cholangiocarcinoma

Ubiquitin-like with PHD and ring finger domains 1 (UHRF1) is abnormally overexpressed in multiple cancers and closely correlated with tumor-promoting effects, such as high proliferation. However, how UHRF1 functions in intrahepatic cholangiocarcinoma (ICC) has not yet been determined. Herein, we found that UHRF1 is overexpressed in ICC tissues. Downregulated UHRF1 attenuated the transition of the G1/S cell cycle and then suppressed cell proliferation in vitro and tumor growth in vivo. Moreover, upstream regulators of the UHRF1 expression were predicted, and we found that direct binding of miR-124-3p inhibited the UHRF1 expression. Elevated miR-124-3p suppressed proliferation and led to the arrest of the cell cycle. Furthermore, the expression of UHRF1 was positively correlated with PCNA. Clinically, we showed that elevated UHRF1 was associated with poor prognosis, and served as an independent prognostic factor in ICC patients. Together, these findings demonstrate that UHRF1, regulated by miR-124-3p, acts as a tumor promoter by promoting cell proliferation in ICC.     

猪miR-331-3p过表达载体的构建及其对细胞增殖的影响

本研究旨在阐明猪miR-331-3p对细胞增殖的影响,探讨其对细胞增殖的作用机制首先构建了miR-331-3p的过表达载体pcDNA 3.1 (+)-miR-331-3p,并将将PK15细胞分为4组,分别为实验组、实验组对照组、抑制剂组和抑制剂对照组。实验组和对照组分别转染pcDNA 3.1(+)-miR-331-3p和pcDNA 3.1(+)。抑制剂组和抑制剂对照组分别转染miR-331-3p Inhibitor和miR-331-3p阴性对照(miR-331-3p NC)。通过在各组添加CCK-8试剂绘制细胞增殖曲线,并使用PI染色检测细胞所处周期比例。同时,利用实时荧光定量PCR(Quantitative real-time PCR,qPCR)检测生长抑制蛋白家族成员5 (Inhibitor of growth family member 5,ING5)、细胞周期蛋白依赖性激酶2 (Cyclin dependent kinase 2,CDK2)、细胞周期蛋白依赖性激酶3 (Cyclin dependent kinase 3,CDK3)、细胞周期蛋白依赖性激酶4 (Cyclin dependent kinase 4,CDK4)、细胞周期蛋白B (Cyclin B)和细胞周期蛋白依赖性激酶抑制剂1A(Cyclindependentkinaseinhibitor1A,CDKN1A)的表达变化。结果表明,实验组miR-331-3p表达量显著升高,细胞增殖曲线表明48 h和72 h时细胞数目均呈现出实验组实验对照组和抑制剂对照组抑制剂组的趋势(P0.05)。与实验对照组相比,实验组处于G0/G1期的细胞比例下调,S期和G2/M细胞的比例上调,抑制剂对照组趋势与之相反;同时,实验组中与促进增殖的基因CDK2、CDK3、CDK4和CyclinB的mRNA表达水平均显著升高,而抑制增殖的基因ING5和CDKN1A均表现出显著下降的趋势。本研究成功构建了miR-331-3p过表达载体,且发现miR-331-3p具有促进猪肾上皮细胞增殖的能力,研究结果为深入研究miR-331-3p在猪生长发育中的作用机制奠定了基础。     

miR-129-5p and -3p co-target WWP1 to suppress gastric cancer proliferation and migration

Gastric cancer (GC) is a worldwide health problem. Uncovering the underlining molecular mechanisms of GC is of vital significance. Here, we identified a novel oncogene WW domain-containing E3 ubiquitin protein ligase 1 (WWP1) in GC. WWP1 could promote GC cell proliferation and migration in vitro and expedite GC growth in vivo. We also found out two microRNAs (miRNAs): miR-129-5p and -3p could both target WWP1. Interestingly, miR-129-5p bound to the CDS region of WWP1 mRNA. The miR-129 pairs (miR-129-5p and -3p) play pivotal roles in GC to suppress its proliferation and migration in vitro and slow down GC growth in vivo by repressing WWP1. In summary, we identified two tumor suppressive miRNAs which share the same precursor that could regulate the same oncogene WWP1 in GC. Our finding would add new route for GC research and treatment.     

miR-140-3p suppresses the proliferation and migration of macrophages

Macrophages benefit myelin debris removal, blood vessel formation, and Schwann cell activation following peripheral nerve injury. Identifying factors that modulate macrophage phenotype may advantage the repair and regeneration of injured peripheral nerves. microRNAs (miRNAs) are important regulators of many physiological and pathological processes, including peripheral nerve regeneration. Herein, we investigated the regulatory roles of miR-140-3p, a miRNA that was differentially expressed in injured rat sciatic nerves, in macrophage RAW264.7 cells. Observations from EdU proliferation assay demonstrated that elevated miR-140-3p decreased the proliferation rates of RAW264.7 cells while suppressed miR-140-3p increased the proliferation rates of RAW264.7 cells. Transwell-based migration assay showed that up-regulated and down-regulated miR-140-3p led to elevated and reduced migration abilities, respectively. However, the abundances of numerous phenotypic markers of M1 and M2 macrophages were not significantly altered by miR-140-3p mimic or inhibitor transfection. Bioinformatic analysis and miR-140-3p-induced gene suppression examination suggested that Smad3 might be the target gene of miR-140-3p. These findings illuminate the inhibitory effects of miR-140-3p on the proliferation and migration of macrophages and contribute to the cognition of the essential roles of miRNAs during peripheral nerve regeneration.     

Study on Omentin-1 and miR-502-3p in osteoporotic fracture

Objectives:To explore the expression and correlation of Omentin-1 and miR-502-3p in serum of patients with osteoporotic fracture (OPF).Methods:Sixty OPF patients diagnosed and treated in our hospital from June 2018 to December 2019 were included in group A. Fifty-six osteoporosis patients without fractures were included in group B. Omentin-1 and miR-502-3p levels were detected by enzyme-linked immunosorbent assay (ELISA) and real-time quantitative PCR (qRT-PCR). Their predictive value for diagnostic efficiency was assessed by ROC curve. Spearman’s rank correlation test was used for correlation analysis. The risk factors related to the prognosis of OPF were analyzed by Logistic univariate and multivariate analysis.Results:The expression of Omentin-1 and miR-502-3p in group A was markedly lower than in group B (P<0.001). Spearman correlation analysis showed that in OPF, there was a negative correlation between serum Omentin-1 and TNF-α (r=0.8579, P<0.001), a negative correlation between serum miR-502-3p and TNF-α (r= 0.8653, P<0.001), and a positive correlation between serum Omentin-1 and miR-502-3p (r= 0.8764, P<0.001).Conclusions:Omentin-1 and miR-502-3p were down-regulated in serum of patients with OPF, both of which could be used as potential biomarkers for the diagnosis and disease evaluation of OPF.