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-489-3p靶向负调控BDNF并抑制PC12细胞增殖

目的:探究微小RNA-489-3p(miR-489-3p)对神经生长因子家族重要成员脑源性神经营养因子(BDNF)的转录后调控及对PC12细胞增殖能力的影响。方法:通过生物信息预测和双萤光素酶报告基因实验检测miR-489-3p与BDNF的结合能力。PC12细胞分别转染mimic control/miR-489-3p mimic和inhibitor control/miR-489-3p inhibitor,分别采用RT-qPCR、Western blot、CCK-8和EdU实验检测miR-489-3p和BDNF的表达及细胞增殖能力的变化。结果:生物信息分析和双萤光素酶报告基因实验结果显示,miR-489-3p能够结合BDNF的3′-UTR。转染miR-489-3p mimic可以显著提高PC12细胞的miR-489-3p水平,而BDNF的蛋白表达显著下调,细胞增殖能力显著降低(P0.05);转染miR-489-3p inhibitor可以显著降低PC12细胞的miR-489-3p水平,而BDNF的蛋白表达显著上调,并且显著提高了细胞的增殖能力(P0.05)。过表达或抑制miR-489-3p对BDNF的mRNA表达并无显著影响。结论:miR-489-3p可以在转录后水平靶向负调控BDNF的表达。miR-489-3p抑制PC12细胞的增殖。     

miR-107抑制胶质瘤细胞的体外增殖、迁移和侵袭

目的探讨miR-107对胶质瘤细胞增殖、迁移和侵袭的调控机制。方法运用RT-qPCR检测人正常的星形胶质细胞系NHA、神经胶质瘤细胞系U87、A172、U251中miR-107和FOXK1的表达;将细胞分为miR-NC组(转染miR-NC)、miR-107组(转染miR-107 mimics)、si-NC组(转染si-NC)、si-FOXK1组(转染si-FOXK1)、miR-107+pcDNA3.1组(共转染miR-107 mimics和pcDNA3.1)和miR-107+pcDNA3.1-FOXK1组(共转染miR-107 mimics和pcDNA3.1-FOXK1);用脂质体法分别转染至U87细胞;CCK-8法检测细胞的增殖;Transwell小室实验检测细胞的迁移和侵袭;Western blot检测细胞中FOXK1的蛋白表达;双荧光素酶报告基因检测实验检测细胞的荧光活性。结果与正常的星形胶质细胞NHA相比,神经胶质瘤细胞U87、A172、U251中miR-107表达明显下调,FOXK1表达明显上调(P<0.05);过表达miR-107、敲减FOXK1均可抑制U87细胞的增殖、迁移和侵袭;miR-107可抑制野生型FOXK1的细胞荧光活性,并负向调控FOXK1的表达;过表达FOXK1可逆转miR-107对U87细胞增殖迁移侵袭的抑制作用。结论 miR-107抑制胶质瘤细胞增殖、迁移和侵袭的作用机制可能与靶向负调控FOXK1有关,将可为胶质瘤的诊断和治疗提供靶向治疗的依据。     

miRNA-144抑制小鼠RAW264.7巨噬细胞ABCA1表达

目的构建miR-144真核表达载体,检测miR-144是否调控小鼠RAW264.7巨噬细胞三磷酸腺苷结合盒转运体A1(ABCA1)的表达。方法结合文献,通过预测软件分析,选取评分较高、可作用于ABCA1 mRNA 3'非编码区(ABCA1 mRNA3'UTR)的miR-144。通过分子克隆技术,利用PCR扩增miR-144和ABCA1 mRNA 3'UTR的DNA序列,酶切胶回收后,分别连接至真核表达载体pcDNA3.1(+)载体和pcDNA3.1(+)-luciferase载体上。测序后,运用双荧光素酶报告基因系统检测萤火虫荧光素酶的活性,观察miR-144是否对ABCA1 mRNA 3'UTR具有直接靶向作用。运用LipofectamineTM2000将pcDNA3.1(+)空载体、pcDNA3.1(+)-miR-144转染至小鼠RAW264.7巨噬细胞。通过实时定量PCR(qRT-PCR)检测转染后miR-144的表达含量。通过qRT-PCR和Western blot法检测过表达miR-144后ABCA1在mRNA和蛋白水平的变化。结果 miR-144 PCR产物连接至pcDNA3.1(+)载体上,ABCA1 mRNA 3'UTR连接至pcDNA3.1(+)-luciferase载体上,测序正确。运用双荧光素酶报告基因系统检测发现,和对照组[pcDNA3.1(+)空载体、pcDNA3.1(+)-luciferase-ABCA1 3'UTR和PRL-SV40联合转染]三者相比,实验组[pcDNA3.1(+)-miR144、pcDNA3.1(+)-luciferase-ABCA1 3'UTR和PRL-SV40联合转染]三者可以显著降低萤火虫荧光素酶的活性(P0.05),证明miR-144对ABCA1 mRNA3'UTR具有直接靶向作用。将pcDNA3.1(+)空载体、pcDNA3.1(+)-miR-144转染至小鼠RAW264.7细胞中,qRT-PCR结果显示,转染pcDNA3.1(+)空载体组miR-144表达无明显变化(P0.05);转染pcDNA3.1(+)-miR-144组中miR-144表达量显著增高(P0.01).qRT-PCR结果显示,转染pcDNA3.1(+)空载体和pcDNA3.1(+)-miR-144对ABCA1 mRNA表达水平无明显影响(P0.05),Western blot结果显示转染pcDNA3.1(+)-miR-144可以显著降低ABCA1蛋白水平的表达(P0.01)。结论 miR-144可以在转录后水平降低ABCA1蛋白的表达。     

mi R-34a-3p抑制胰腺癌细胞增殖和侵袭转移并下调Smad2/TGF-β信号通路

目的 探讨miR-34a-3p对胰腺癌细胞的作用及可能机制。方法 RT-qPCR方法检测miR-34a-3p在人胰腺导管腺癌细胞SW1990和胰腺导管上皮细胞HPDE中的表达情况;转染miR-34a-3p mimics后,采用CCK-8法检测细胞增殖;Transwell小室实验检测细胞侵袭情况;Western blot检测细胞上皮-间质转化情况;进一步用生物信息学预测miR-34a-3p的下游靶基因,并用荧光素酶报告基因实验验证;然后采用Western blot检测靶蛋白以及靶蛋白下游调控蛋白的表达。结果 RT-qPCR检测发现miR-34a-3p在SW1990中的表达低于HPDE细胞。miR-34a-3p在SW1990细胞中过表达后,SW1990细胞增殖受到抑制、侵袭能力降低、E-cadherin表达上调、N-cadherin表达下调。生物信息学网站预测、双荧光素酶报告基因实验和Western blot证实Smad2是miR-34a-3p的靶蛋白,同时发现其下游蛋白TGF-β表达也显著下调。结论 miR-34-3p在胰腺癌细胞中的表达下调,miR-34-3p能够抑制胰腺癌细胞增殖、侵...     

MicroRNA-450a-3p通过抑制Bub1基因的表达调控小鼠细胞增殖和胚胎发育

目的:探讨microRNA-450a-3p(miR-450a-3p)对小鼠细胞增殖和胚胎发育的调控是否通过抑制Bub1基因的表达实现。方法:用萤光素酶报告基因实验检测miR-450a-3p能否特异性结合于Bub1基因的3’-非翻译区(untranslated region, UTR);用Western blotting和实时荧光定量RT-PCR检测miR-450a-3p对Bub1蛋白和mRNA表达;分别通过MTT、Hoechst染色、流式细胞术等分析miR-450a-3p对小鼠胚胎成纤维细胞(mouse embryonic fibroblasts,MEFs)增殖、凋亡和细胞周期等生物学功能的调控;利用染色体核型分析技术检测miR-450a-3p对MEFs染色体数目的影响。结果:miR-450a-3p能与靶基因Bub1的3’-UTR结合,在翻译水平抑制MEFs中Bub1的表达,然而其转录水平的表达却不受影响。miR-450a-3p通过下调靶基因Bub1的表达,抑制MEFs的增殖,促进细胞的凋亡;而且miR-450a-3p还能使大多数细胞停滞在G₁/G₀期,使细胞分裂受阻,导致细胞染色体数目异常。结论:miR-450a-3p能够调控靶基因Bub1的表达,抑制MEFs增殖,并最终影响小鼠胚胎的发育。     

miR-125a-5p靶向LIMK1逆转非小细胞肺癌A549/DDP细胞对顺铂的耐药性

目的:探讨微小RNA-125a-5p(miR-125a-5p)对非小细胞肺癌A549/DDP细胞对顺铂耐药性的影响及其作用机制。方法:RT-qPCR检测非小细胞肺癌组织及其细胞株A549和A549/DDP中miR-125a-5p和LIM激酶1(LIMK1)的表达;在A549/DDP细胞中上调或下调miR-125a-5p或LIMK1表达,分别采用MTT法、流式细胞术和Western blot检测细胞活力、凋亡率及耐药相关蛋白表达;TargetScan在线预测、萤光素酶报告基因实验验证miR-125a-5p和LIMK1的靶向关系;共表达miR-125a-5p和LIMK1,检测细胞活力、凋亡率及耐药相关蛋白表达。结果:在非小细胞肺癌组织及其细胞株中,miR-125a-5p表达下调,LIMK1表达上调(P0.05);萤光素酶报告基因实验表明miR-125a-5p可负向调控LIMK1表达。过表达miR-125a-5p或敲减LIMK1表达使A549/DDP细胞的活力下降,细胞凋亡率增加,顺铂的IC_(50)减小,耐药相关蛋白表达下调(P0.05)。过表达LIMK1则使miR-125a-5p对A549/DDP细胞活力和耐药相关蛋白表达的抑制作用减弱。结论:miR-125a-5p能通过抑制LIMK1基因表达,下调耐药相关蛋白表达,从而逆转A549/DDP细胞对顺铂的耐药性。     

miR-27a-3p靶向SnoN抑制高糖诱导的人近端肾小管上皮细胞EMT的作用

目的研究miR-27a-3p对高糖诱导的人近端肾小管上皮细胞EMT的影响并探讨其机制。方法运用qRT-PCR检测HK2细胞中miR-27a-3p的表达;将HG+anti-miR-NC组(转染anti-miR-NC)、HG+anti-miR-27a-3p组(转染anti-miR-27a-3p)、HG+pcDNA组(转染pcDNA)、HG+pcDNA-SnoN组(转染pcDNA-SnoN),均用脂质体转染至HK2细胞,并用D-葡萄糖(30mmol/L)处理48 h;Western blot检测各组细胞中E-cadherin、N-cadherin、SnoN、TGF-β1、p-Smad2的蛋白表达;双荧光素酶报告基因检测实验检测细胞的荧光活性。结果与低糖对照组相比,HG组细胞中miR-27a-3p显著升高,SnoN显著降低,Ecadherin、p-Smad2显著降低,N-cadherin、TGF-β1表达显著升高,(P0.05);抑制miR-27a-3p、过表达SnoN均可上调Ecadherin,下调N-cadherin,抑制HK2细胞EMT;SnoN是miR-27a-3p的靶点。过表达SnoN可下调TGF-β1,上调p-Smad2,失活TGF-1信号通路。结论 miR-27a-3p可抑制高糖诱导的人近端肾小管上皮细胞EMT,其机制可能与靶向SnoN失活TGF-β1信号通路有关,将可为糖尿病肾病的治疗提供依据。     

miR-99a-5p通过靶向mTOR抑制前列腺癌细胞增殖及肿瘤生长

目的 探讨miR-99a-5p靶向mTOR对前列腺癌细胞增殖及肿瘤生长的影响。方法 CCK-8法检测miR-99a-5p对DU-145细胞增殖的影响;miR-99a-5p mimics转染前列腺癌DU-145细胞,通过实时定量PCR检测miR-99a-5p和mTOR mRNA表达,Western blot检测miR-99a-5p过表达后DU-145细胞mTOR蛋白的表达;通过生物信息学网站预测mTOR是否为miR-99a-5p潜在的靶基因,并通过双荧光素酶报告基因实验进行验证,CCK-8和肿瘤异种移植裸鼠模型验证miR-99a-5p通过靶向mTOR对前列腺癌细胞增殖及肿瘤生长的影响。结果 转染miR-99a-5p mimics抑制DU-145细胞体外增殖活性,降低mTOR mRNA和蛋白的表达,miR-99a-5p结合mTOR mRNA 3’UTR区域,且miR-99a-5p通过靶向mTOR抑制前列腺癌细胞增殖及肿瘤生长。结论 miR-99a-5p通过靶向调控mTOR抑制前列腺癌细胞的增殖及肿瘤生长。     

缝隙连接蛋白Cx43介导高糖诱导的气道上皮结构受损

目的:探讨缝隙连接蛋白(Connexin43,Cx43)在高糖(High glucose,HG)诱导气道上皮结构受损的相关调节机制。方法:构建突变的Cx43磷酸化载体pEGFP-N1-Cx43~(279)-MU、pEGFP-N1-Cx43~(365)-MU和pEGFP-N1-Cx43~(368)-MU,转染正常人支气管上皮细胞16HBE,给予高糖刺激,Western blot法、Real-time PCR法测定Cx43的蛋白及mRNA水平,Western blot法测定紧密连接蛋白(Zonula occludens-1,ZO-1)及黏附连接蛋白(E-cadherin)的表达,激光共聚焦检测ZO-1的表达及定位。结果:与对照组相比,HG刺激后Cx43 mRNA表达及蛋白含量均降低,ZO-1及E-cadherin的表达亦明显降低,均低于对照组(P0.05)。转染Cx43磷酸化突变载体pEGFP-N1-Cx43~(279)-MU、pEGFP-N1-Cx43~(365)-MU和pEGFP-N1-Cx43~(368)-MU的细胞经HG刺激后,Cx43表达明显增强,显著高于单纯HG组(P0.05),同时伴随ZO-1及E-cadherin的表达的增强(P0.05)。结论:缝隙连接蛋白Cx43参与了HG诱导的气道上皮结构受损,是气道上皮机械防御屏障的重要调控分子。     

RETRACTED: CircFBXW7 alleviates glioma progression through regulating miR-23a-3p/PTEN axis

Increasing evidence has confirmed that circular RNAs (circRNAs) are involved in regulating the development and progression of various tumors. The aim of this study was to examine the effect of circFBXW7 on the progression of glioma and to determine its underlying mechanism. qRT-PCR was performed to measure the expression of circFBXW7, miR-23a-3p, and PTEN in tissues and cell lines of glioma. The proliferation ability of glioma cells was examined using the CCK-8 assay. Glioma cell migration and invasion capacity were detected using Transwell assays. The dual-luciferase reporter gene assay was employed to examine the correlation between miR-23a-3p and circFBXW7 or PTEN. The expression levels of the related genes were determined using western blotting analysis. A glioma xenograft tumor model was employed to evaluate the functional roles of circFBXW7 in vivo. CircFBXW7 was found to be aberrantly downregulated in glioma tumor tissues and cell lines. Overexpression of circFBXW7 was found to significantly inhibit the proliferation, migration and invasion ability of the glioma cells. Moreover, bioinformatic analysis and dual-luciferase reporter assays confirmed that circFBXW7 can directly target miR-23a-3p, which then blocks the binding of miR-23a-3p to the 3′ un-translated region (UTR) of PTEN. Mechanically, circFBXW7 suppresses cell proliferation and metastasis in glioma by sponging miR-23a-3p, resulting in elevated PTEN expression. In addition, in vivo experiments also confirmed that circFBXW7 overexpression effectively halts tumor growth and metastasis. Consistent with the in vitro observations, circFBXW7 overexpression significantly decreased miR-23a-3p, Ki-67, and N-cadherin, as well as increased PTEN and E-cadherin levels. Our results revealed that circFBXW7 exhibits antiproliferative and antimetastasis activities via sponging miR-23a-3p to elevate PTEN expression in glioma, which may offer a novel target for clinical therapy and diagnosis of glioma.     

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。     

MicroRNA-126通过靶向抑制EZH2增加胃癌SGC-7901细胞的放射敏感性

目的:探讨微小RNA-126(miR-126)增强胃癌细胞放射敏感性的分子生物学机制。方法:体外培养胃癌SGC-7901细胞,通过转染miR-126模拟序列上调细胞内的miR-126水平,使用RT-q PCR及Western blot检测miR-126上调后zeste基因增强子同源物2(EZH2)的mRNA及蛋白水平的变化。双萤光素酶报告基因实验确认miR-126与EZH2的靶向结合关系。在上调miR-126水平的同时,通过共转染pc DNA3.1-EZH2真核表达质粒提高细胞内的EZH2表达,CCK-8法及流式细胞术分析照射后胃癌细胞的活力及凋亡率的变化,从而评估EZH2过表达对miR-126放射增敏作用的影响。结果:上调胃癌SGC-7901细胞中的miR-126水平可以显著抑制EZH2的mRNA及蛋白水平(P0.05)。双萤光素酶报告基因实验提示miR-126与EZH2的mRNA间存在直接靶向关系。与仅上调miR-126的细胞相比,上调miR-126水平的同时过表达EZH2水平,将导致照射后SGC-7901细胞的活力增加,凋亡率减少(P0.05)。结论:对EZH2靶向抑制是miR-126增强胃癌SGC-7901细胞放射敏感性的机制之一。     

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.     

miR-142-5p regulates pancreatic cancer cell proliferation and apoptosis by regulation of RAP1A

Pancreatic cancer, one of the fatal and aggressive malignancies, leads the sixth cancer-associated death in China. microRNAs are believed to exert function in the diagnosis and treatment of pancreatic cancer. In the present study, we firstly found that miR-142-5p was downregulated in pancreatic cancer tumor tissues while Ras-related protein Rap-1 A (RAP1A) was upregulated compared with para-carcinoma non-tumor tissues. Then, we found that RAP1A could be a putative target gene of miR-142-5p by bioinformatics tool TargetScan. Furthermore, we conducted luciferase reporter assay, RT-qPCR, western blot and correlation analysis to demonstrate that miR-142-5p could negatively regulate RAP1A expression by binding to its 3′UTR. In addition, cell-counting kit 8 (CCK-8) and flow cytometry assays certified that miR-142-5p overexpression may inhibit pancreatic cancer cell proliferation but promote cell apoptosis; while the variation could be reversed by co-transfected with pcDNA3.1-RAP1A. Finally, miR-142-5p overexpression downregulated p-ERK1/2, phosphate p38 mitogen-activated protein kinases (p-p38); however, the variation induced by miR-142-5p mimic could be reversed by co-transfected with pcDNA3.1-RAP1A. In conclusion, our findings indicate that targeting miR-142-5p may provide a novel strategy for the treatment of pancreatic cancer.     

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。     

miR-133a-3p attenuates cardiomyocyte hypertrophy through inhibiting pyroptosis activation by targeting IKKε

ObjectiveCardiac hypertrophy is an adaptive response to physiological and pathological stimuli, the latter of which frequently progresses to valvulopathy, heart failure and sudden death. Recent reports revealed that pyroptosis is involved in regulating multiple cardiovascular diseases progression, including cardiac hypertrophy. However, the underlying mechanisms remain poorly understood. This study aims to extensively investigate the regulation of miR-133a-3p on pyroptosis in angiotensin II (Ang II)-induced cardiac hypertrophyin vitro.MethodsThe in vitro model of cardiac hypertrophy was induced by Ang II, which was validated by qPCR combined with measurement of cell surface area by immunofluorescence assay. CCK-8 assay and Hochest33342/PI staining was performed to assess pyroptosis. Dual luciferase reporter system was used to verify the direct interaction between miR-133a-3p and IKKε. The effects of miR-133a-3p/IKKε on pyroptosis activation and cardiac hypertrophy markers (Caspase-1, NLRP3, IL-1β, IL-18, GSDMD, ASC, ANP, BNP and β-MHC) were evaluated by western blot, ELISA and qPCR.ResultsAng II treatment could induce cardiomyocyte hypertrophy and pyroptosis. The expression of miR-133a-3p was repressed in Ang II-treated HCM cells, and its overexpression could attenuate both pyroptosis and cardiac hypertrophyin vitro. Additionally, IKKε expression was significantly up-regulated in Ang II-induced HCM cells. Dual luciferase reporter system and qPCR validated that miR-133a-3p directly targeted the 3’-UTR of IKKε and suppressed its expression. Moreover, IKKε overexpression impaired the protective function of miR-133a-3p in cardiomyocyte hypertrophy.ConclusionCollectively, miR-133a-3p attenuates Ang II induced cardiomyocyte hypertrophy via inhibition of pyroptosis by targeting IKKε. Therefore, miR-133a-3p up-regulation may be a promising strategy for cardiac hypertrophy treatment.     

miR-196a靶向调控HOXA9基因的实验研究

目的:研究HOXA9基因的表观遗传学调控机制,筛选靶向调控HOXA9基因的microRNA。方法:利用Tar-getscan在线分析软件预测特异性靶向HOXA9基因3’端非编码区域(3’UTR)的microRNA,采用PCR方法从1例健康供者DNA中扩增HOXA9基因3’UTR序列,插入经XbaI和PstI双酶切的荧光素酶报告载体pGL3-M,采用脂质体SuperFect包裹荧光素酶重组质粒及microRNA表达质粒转染293T细胞,应用双荧光素酶检测试剂盒测定荧光素酶活性。构建miR-196a结合位点突变的HOXA9基因3’端非编码区域突变型荧光素酶报告载体,采用脂质体SuperFect包裹荧光素酶突变型重组质粒及miR-196a表达质粒转染293T细胞,应用双荧光素酶检测试剂盒测定荧光素酶活性。miR-196amimics以脂质体Hiperfect转染至MV4-11细胞,实时定量PCR及Westernblot检测HOXA9mRNA及蛋白的表达。结果:成功构建了含有1628bp的HOXA9基因3’UTR序列的荧光素酶报告重组质粒pGL3-HOXA9-3’UTR,并通过酶切及基因测序方法的鉴定;荧光素酶报告实验提示miR-196a组荧光素酶活性明显低于对照组。成功构建了miR-196a的2个结合位点突变的HOXA9基因3’UTR序列的突变型荧光素酶报告重组质粒pGL3-HOXA9-mut3’UTR,并通过基因测序方法的鉴定。miR-196a可以下调野生型质粒的荧光素酶活性,不影响突变型质粒的荧光素酶活性。MV4-11细胞中过表达miR-196a,可以明显下调HOXA9mRNA及蛋白表达。结论:miR-196a通过靶向结合HOXA9基因3’UTR的结合位点特异调控HOXA9基因。