lncRNA DDX11-AS1靶向miR-299-3p调控宫颈癌细胞增殖、迁移和侵袭

目的 探讨长链非编码RNA(long non-coding RNA,lncRNA)DDX11反义RNA1(DDX11 antisense 1,DDX11-AS1)靶向miR-299-3p对宫颈癌细胞增殖、迁移侵袭的影响。 方法 实时荧光定量PCR(RT-qPCR)检测宫颈癌组织、癌旁组织中DDX11-AS1和miR-299-3p表达水平。将小干扰RNA阴性对照(si-NC组)、DDX11-AS1小干扰RNA组(si-DDX11-AS1组)、miR-299-3p模拟物组(miR-299-3p组)、miRNA模拟物阴性对照组(miR-NC组)、si-DDX11-AS1+miRNA抑制物阴性对照组(si-DDX11-AS1+anti-miR-NC组)、si-DDX11-AS1+miR-299-3p抑制物组(si-DDX11-AS1+anti-miR-299-3p组)分别转染HeLa细胞。采用四甲基偶氮唑蓝(MTT)、transwell实验分别检测细胞活力、迁移侵袭能力。双荧光素酶报告实验和RT-qPCR验证DDX11-AS1对miR-299-3p的靶向调控作用。 结果 与癌旁组织相比,宫颈癌组织中DDX11-AS1表达显著升高,miR-299-3p表达显著降低(P<0.05)。与si-NC组相比,si-DDX11-AS1组HeLa细胞活力、迁移和侵袭细胞数显著降低(P<0.05)。与miR-NC组比较,miR-299-3p组HeLa细胞活力、迁移和侵袭细胞数显著降低(P<0.05)。与si-DDX11-AS1+anti-miR-NC组比较,si-DDX11-AS1+anti-miR-299-3p组HeLa细胞活力、迁移和侵袭细胞数显著升高(P<0.05)。miR-299-3p是DDX11-AS1的靶基因,DDX11-AS1负调控miR-299-3p表达。 结论 宫颈癌中DDX11-AS1呈高表达。沉默DDX11-AS1通过上调miR-299-3p能够降低宫颈癌细胞增殖、迁移侵袭能力。     

沉默lncRNA MAFG-AS1对人卵巢癌细胞增殖和凋亡的影响及分子机制

目的探讨沉默lncRNA MAFG-AS1对人卵巢癌细胞增殖和凋亡的影响及分子机制。方法 qRT-PCR检测正常卵巢上皮细胞HOSE和3种卵巢癌细胞(SKOV3、HO8910、OVCAR3)中MAFG-AS1和miR-143-3p的表达。荧光素酶报告基因检测和qRT-PCR验证MAFG-AS1与miR-143-3p的靶向调控关系。以SKOV3细胞为研究对象,分别构建沉默MAFG-AS1或过表达miR-143-3p的卵巢癌细胞株。应用MTT法检测细胞活力,应用流式细胞术检测细胞凋亡情况,应用Western Blot检测增殖相关蛋白Cyclin D1和p21及凋亡相关蛋白Bcl-2及Bax的表达。结果与HOSE组比较,3种卵巢癌细胞中MAFG-AS1的表达显著上调,miR-143-3p的表达显著下调。pc DNA组、pc DNA-MAFG-AS1组、si-NC组、si-MAFG-AS1组miR-143-3p表达水平比较差异有统计学意义(P0.05)。miR-143-3p是MAFG-AS1的靶基因,MAFG-AS1可负性调控miR-143-3p的表达。沉默MAFG-AS1或过表达miR-143-3p均可抑制卵巢癌细胞的增殖,促进细胞凋亡,抑制Cyclin D1和Bcl-2蛋白表达,促进p21和Bax蛋白表达。抑制miR-143-3p表达可逆转沉默MAFG-AS1对卵巢癌细胞的增殖抑制和凋亡促进作用。结论沉默MAFGAS1通过上调miR-143-3p表达可抑制卵巢癌细胞的增殖,促进细胞凋亡。     

微小RNA-124-3p靶向胰岛素样生长因子2 mRNA结合蛋白1对子宫内膜癌细胞生物学行为的影响

目的 探讨微小RNA-124-3p(miR-124-3p)靶向胰岛素样生长因子2 mRNA结合蛋白1(IGF2BP1)对子宫内膜癌细胞生物学行为的影响。方法 选取2015年1月—2021年1月磐石市医院保存的子宫内膜癌组织及癌旁组织20例，分析miR-124-3p在癌组织、癌旁组织中的表达及与患者临床病理特征的关系。用子宫内膜癌MFE-280细胞进行miR-124-3p沉默和过表达转染，分为空白组、miR-124-3p-inhibitor组、miR-124-3p-mimic组，分析调控miR-124-3p表达对子宫内膜癌MFE-280细胞增殖、凋亡、迁移、侵袭等生物学行为的影响。采用双荧光素酶报告实验预测miR-124-3p的靶基因，分析miR-124-3p对子宫内膜癌MFE-280细胞IGF2BP1表达量的影响。结果 子宫内膜癌组织miR-124-3p表达量(1.01±0.09)低于癌旁组织(1.89±0.25),差异有统计学意义(t=14.810,P<0.05)。miR-124-3p与FIGO分期、组织学分级、淋巴结转移、肌层浸润深度有关，miR-124-3p在Ⅳ期、G3分级...     

lncRNA SNHG3靶向调控miR-340对卵巢癌细胞上皮间质转化的影响

目的 探究长链非编码RNA小核仁RNA宿主基因3(lncRNA SNHG3)对卵巢癌细胞恶性生物学行为的调控机制。方法 体外培养人卵巢癌细胞株(SKOV3、A2780、SW626和OVCAR3)和正常卵巢上皮细胞(HOSEpiC),将对数生长期的OVCAR3细胞分为对照组、si-NC组、SNHG3沉默组、miR-NC组、miR-340-5p过表达组、SNHG3沉默+anti-miR-NC组、SNHG3沉默+anti-miR-340-5p组。RT-qPCR检测细胞中lncRNA SNHG3、miR-340-5p表达;双荧光素酶实验验证SNHG3和miR-340-5p的调控作用;CCK-8法、划痕实验和Transwell小室实验检测各组细胞增殖、迁移、侵袭能力;Western blot检测各组细胞中上皮间质转化(epithelial mesenchymal transformation, EMT)相关蛋白[E-钙粘蛋白(E-cadherin)、N-钙粘蛋白(N-cadherin)、波形蛋白(VIM)]表达。裸鼠成瘤实验检测沉默SNHG3的OVCAR3细胞体内生长情况;免疫组织化学法和RT-...     

miR-214对HepG2细胞增殖及细胞周期影响

目的探讨miR-214对Hep G2细胞增殖及细胞周期的影响。方法 Realtime-PCR法检测肝癌细胞株SMMC-7721、Hep G2、SK-Hep-1、Huh 7、Hep3B及正常肝细胞L-02中miR-214表达量,并利用脂质体转染miR-214NC及miR-214 mimics,采用Realtime-PCR法检测转染效果;采用MTT法、流式细胞术分别检测miR-214对肝癌细胞活力、凋亡及细胞周期影响;蛋白印迹(WB)检测miR-214对肝癌细胞中细胞周期蛋白D1(cyclin D1),细胞周期蛋白依赖性激酶4(CDK4),生存素(survivin)及增值细胞核抗原(PCNA)表达影响。结果 miR-214在肝癌细胞SMMC-7721、SK-Hep-1、Huh 7、Hep3B、Hep G2中表达量[分别为(1.25±0.10)、(1.43±0.10)、(0.95±0.09)、(0.98±0.01)、(0.82±0.08)]明显低于正常肝细胞L-02(2.52±0.23),其中Hep G2中miR-214表达量最低。miR-214 mimics组Hep G2细胞中miR-214表达量(2.38±0.23)明显高于miR-214 NC组(0.83±0.08),miR-214mimics组Hep G2细胞活力(0.37±0.03)明显低于miR-214 NC组(0.78±0.07);与miR-214 NC组比较,miR-214mimics组Hep G2细胞凋亡率明显升高,细胞周期阻滞于G1期,cyclin D1、CDK4、survivin及PCNA表达量下调,差异均有统计学意义(P0.01)。结论上调miR-214表达可抑制肝癌细胞增殖,其机制可能与调控细胞周期相关蛋白表达水平有关。     

miR-146a-5p及miR-9-3p对炎症反应及脂代谢调节因子的作用

目的 通过检测microRNA-146a-5p(miR-146a-5p)、microRNA-9-3p(miR-9-3p)对HepG2细胞白介素受体相关激酶-1(interleukin receptor-associated kinase-1,IRAK-1)、ATP结合盒转运蛋白A1(ATP-binding gassette transporter A1,ABCA1)蛋白水平表达的影响，探讨miR-146a-5p及miR-9-3p对炎症反应及脂代谢调节因子作用。方法 以HepG2细胞为试验对象，分别进行miR-146a-5pmimics转染及miR-9-3pmimics转染，采用Westernblot检测miR-146a-5p对HepG2细胞IRAK-1蛋白表达的影响及miR-9-3p对HepG2细胞ABCA1蛋白水平表达的影响。结果 miR-146a-5p转染组IRAK-1蛋白水平显著低于对照组；miR-9-3p转染组ABCA1的蛋白水平显著低于对照组，差异均具有统计学意义（P=0.001）。结论 miR-146a-5p能够显著下调HepG2细胞IRAK-1蛋白表达，miR-9-3p能...     

miR-96-5p靶向IRS1对麦芽酚铝致PC12细胞凋亡的影响

目的探讨miR-96-5p在麦芽酚铝致PC12细胞凋亡中的影响及其作用机制。方法于2021年1月, 取对数生长期的PC12细胞, 分为空白对照组和低、中、高剂量组, 分别采用0、100、200、400 μmol/L的麦芽酚铝处理24 h, 收集各组细胞, 采用流式细胞术检测细胞凋亡率, qRT-PCR检测miR-96-5p和胰岛素受体底物1(IRS1)mRNA表达水平, Western blotting检测半胱氨酸蛋白酶3(Caspase3)、活化型半胱氨酸蛋白酶3(Cleaved-caspase3)、IRS1、磷酸化蛋白激酶B(p-AKT)、磷酸化葡萄糖合成激酶3β(p-GSK3β)蛋白表达水平。双荧光素酶报告基因实验检测miR-96-5p和IRS1的靶向结合关系。采用miR-96-5p inhibitor转染PC12细胞24 h构建miR-96-5p抑制细胞和阴性对照细胞, 将细胞分为空白对照组、阴性对照组、铝染毒组、铝染毒+阴性对照组、铝染毒+miR-96-5p抑制组、miR-96-5p抑制组, 采用miR-96-5p inhibitor和IRS1 siRNA转染PC12细胞24...     

长链非编码RNA MAPKAPK5-AS1对肺癌细胞的侵袭和凋亡的影响

目的研究长链非编码RNA(long ncRNA, lncRNA)MAPKAPK5-AS1对肺癌细胞的侵袭和凋亡的影响。方法 real-time PCR法筛选MAPKAPK5-AS1高表达和低表达肺癌细胞系,将MAPKAPK5-AS1过表达载体转染低表达细胞系,MAPKAPK5-AS1小干扰RNA (small interference RNA,siRNA)转染高表达细胞系,Western blot分别检测宿主基因MAPKAPK5和凋亡蛋白表达,transwell实验分析细胞侵袭能力。结果 MAPKAPK5-AS1在肺癌H2291细胞株和A549细胞株中高表达,而在H441细胞株中低表达。在H441细胞中过表达MAPKAPK5-AS1后, MAPKAPK5表达明显下降,侵袭能力明显增强(F=319.5,P0.01),凋亡蛋白Cleaved caspase 9的表达下降;而在H2291细胞和A549细胞中分别干扰MAPKAPK5-AS1表达后,MAPKAPK5表达明显升高,侵袭能力明显下降(F值分别为417.1、530.2,P0.01),凋亡蛋白Cleaved caspase 9的表达升高。结论 MAPKAPK5-AS1可能作为原癌基因通过调控宿主基因MAPKAPK5表达而增强肺癌细胞侵袭能力,同时抑制细胞凋亡。     

LINC00943靶向调控miR-125a-5p对幽门螺杆菌诱导的人胃黏膜上皮细胞GES-1损伤的影响

目的 探讨LINC00943对幽门螺杆菌(Hp)诱导的人胃黏膜上皮细胞GES-1损伤的影响及其分子机制。方法 将GES-1细胞分为Control组、Hp组、Hp+si-NC组、Hp+si-LINC00943组、Hp+miR-NC组、Hp+miR-125a-5p组、Hp+si-LINC00943+anti-miR-NC组和Hp+si-LINC00943+anti-miR-125a-5p组,实时荧光定量PCR检测LINC00943和miR-125a-5p表达水平;流式细胞术检测细胞凋亡;免疫蛋白印迹检测凋亡蛋白表达;酶联免疫吸附法检测白细胞介素-8(IL-8)和IL-1β、乳酸脱氢酶(LDH)水平;双荧光素酶报告基因实验检测LINC00943和miR-125a-5p靶向关系。结果 与Control组比较,Hp组LINC00943表达、凋亡率、Bax蛋白、IL-8、IL-1β、LDH升高,miR-125a-5p表达、Bcl-2蛋白降低(P<0.05);敲减LINC00943或过表达miR-125a-5p可减轻Hp诱导的GES-1细胞损伤;LINC00943靶向调控miR-125a-5p...     

微小核糖核酸-371a-5p靶向调控X相关凋亡抑制蛋白在滋养层细胞凋亡和复发性流产中的作用分析

目的探讨微小核糖核酸-371a-5p(miR-371a-5p)靶向调控X相关凋亡抑制蛋白(XIAP)在滋养层细胞凋亡、复发性流产中的作用。方法滋养层JEG-3细胞经过细胞培养、转染后,分为空白组(Control)、阴性对照组(ND)、miR-371a-5p mimics组及miR-371a-5p inhibitor组。实时荧光定量PCR检测miR-371a-5的表达观察滋养层细胞凋亡能力,免疫印迹(Western blot)检测XIAP、含半胱氨酸的天冬氨酸蛋白水解酶(caspase-3)表达,采用实时荧定量PCR检测XIAP、caspase-3基因。结果Control组miR-371a-5p mRNA表达水平为(1.50±0.09),NC组miR-371a-5p mRNA表达水平为(1.44±0.05),miR-371a-5p mimics组miR-371a-5p mRNA表达水平为(1.23±0.08),miR-371a-5p inhibitor组miR-371a-5p mRNA表达水平为(1.86±0.05),miR-371a-5p mimics组表达低于Control、NC、miR-371a-5pinhibitor组;miR-371a-5p inhibitor组表达高于Control、NC、miR-371a-5p mimics组(F=31.759,P<0.05)。Control组转染48 h后细胞凋亡率为(1.74±0.04)%,NC组转染48 h后细胞凋亡率为(1.76±0.06)%,miR-371a-5p mimics组转染48 h后细胞凋亡率为(3.51±0.09)%,miR-371a-5p inhibitor组转染48 h后细胞凋亡率为(1.33±0.16)%,滋养层细胞转染48 h后miR-371a-5p mimics组细胞凋亡率高于NC、Control及miR-371a-5p inhibitor组;miR-371a-5p inhibitor组低于NC、Control及miR-371a-5p mimics组(F=47.027,P<0.05)。miR-371a-5p mimics组XIAP相对表达量低于NC、Control及miR-371a-5p inhibitor组;miR-371a-5p inhibitor组XIAP相对表达量高于miR-371a-5p mimics、NC及Control组(F=33.541,P<0.05)。miR-371a-5p mimics组caspase-3相对表达量低于NC、Control及miR-371a-5p inhibitor组;miR-371a-5p inhibitor组caspase-3相对表达量高于miR-371a-5p mimics、NC及Control组(F=43.728,P<0.05)。结论miR-371a-5p靶向调控XIAP参与滋养层细胞凋亡的过程,在复发性流产起到重要作用。     

长链非编码RNA核富含丰富的转录本1对癫痫模型海马神经元凋亡的影响和作用机制

目的 探讨长链非编码RNA(lncRNA)核富含丰富的转录本1(NEAT1)对癫痫细胞模型海马神经元凋亡的影响及作用机制,以期为NEAT1成为癫痫治疗的新靶点提供依据。方法 于2019年8月—2020年10月期间,体外培养大鼠海马神经元细胞,无镁诱导制备癫痫海马神经元模型,实验分为:对照组(正常细胞外液)、模型组(无镁细胞外液)、转染对照组(转染非特异性siRNA+无镁细胞外液)和转染组(转染NEAT1特异性siRNA+无镁细胞外液)。实时荧光定量PCR(qPCR)检测NEAT1和miR-29b-3p的表达变化,双荧光素酶报告基因实验检测NEAT1是否靶向调控miR-29b-3p,酶联免疫吸附法(ELISA)检测白细胞介素-1(IL-1)、白细胞介素-6(IL-6)和肿瘤坏死因子-α(TNF-α)的含量,AnnexinV-FITC/PI双染色法检测海马神经元细胞凋亡情况,蛋白免疫印迹法(Western blot)检测各组细胞中B细胞淋巴瘤/白血病-2(Bcl-2)、Bcl-2相关X蛋白(Bax)、Toll样受体4(TLR4)和核因子-κB(NF-κB)的表达水平。结果 与对照组相比,模型组海马神经元凋亡率及NEAT1、Bax、TLR4和NF-κB的表达水平升高(F＝50.980、73.668、65.635、13.203、10.292,P＜0.05),IL-1、IL-6和TNF-α的含量增多(F＝33.107、33.857、51.129,P＜0.05),miR-29b-3p和Bcl-2的表达水平降低(F＝145.023、67.655,P＜0.05);而抑制NEAT1的表达能够降低神经元凋亡,抑制Bax、TLR4和NF-κB的表达,促进miR-29b-3p和Bcl-2的表达,减少IL-1、IL-6和TNF-α的分泌。双荧光素酶报告基因实验证实NEAT1和miR-29b-3p的靶向关系。结论 lncRNA NEAT1靶向下调miR-29b-3p的表达阻断TLR4/NF-κB信号通路来抑制癫痫模型海马神经元的凋亡。     

miR - 93 - 5p抑制呼吸道合胞病毒感染支气管上皮细胞凋亡和炎症反应的机制研究

目的 研究miR - 93 - 5p是否通过靶向Mg2+/Mn2+依赖性蛋白磷酸酶1A（PPM1A）基因抑制呼吸道合胞病毒（RSV）感染的支气管上皮细胞凋亡和炎症反应。方法 将人支气管上皮细胞16 - HBE分为NC组、RSV组、miR - NC+RSV组、miR - 93 - 5p + RSV组、si - NC + RSV组、si - PPM1A + RSV组、pcDNA - NC + RSV组、pcDNA - PPM1A + RSV组、miR - 93 - 5p + pcDNA - NC + RSV组、miR - 93 - 5p + pcDNA - PPM1A + RSV组,利用脂质体Lipofectamine 2000进行miR - NC、miR - 93 - 5p、si - NC、si - PPM1A、pcDNA - NC、pcDNA - PPM1A的转染,并以RSV感染细胞。应用实时荧光定量PCR检测miR - 93 - 5p和PPM1A mRNA表达,western blot测定PPM1A、Cleaved - caspase - 3蛋白表达,ELISA分析TNF - α、IL - 6和IL - 1α分泌,流式细胞仪评估细胞凋亡。生物信息学预测与荧光素酶活性检测验证miR - 93 - 5p对PPM1A的靶向调控。结果 与NC组比较,RSV组细胞16 - HBE中miR - 93 - 5p表达量减少,PPM1A mRNA和PPM1A蛋白、Cleaved - caspase - 3蛋白表达量、TNF - α、IL - 6、IL - 1α分泌和细胞凋亡率增加。miR - 93 - 5p + RSV组细胞16 - HBE中Cleaved - caspase - 3蛋白水平、TNF - α、IL - 6、IL - 1α分泌和细胞凋亡率低于miR - NC + RSV组。miR - 93 - 5p靶向调控PPM1A的表达。与si - NC + RSV组比较,si - PPM1A + RSV组细胞16 - HBE中Cleaved - caspase - 3蛋白水平、TNF - α、IL - 6、IL - 1α分泌和细胞凋亡率降低,而pcDNA - PPM1A + RSV组结果与之相反。与miR - 93 - 5p + pcDNA - NC + RSV组比较,miR - 93 - 5p + pcDNA - PPM1A + RSV组提高细胞16 - HBE的Cleaved - caspase - 3蛋白水平、TNF - α、IL - 6、IL - 1α分泌、细胞凋亡率。上述差异均有统计学意义（均P＜0.05）。结论 miR - 93 - 5p通过靶向PPM1A基因,抑制RSV感染的支气管上皮细胞凋亡和炎症反应。     

LncRNA ZFAS1 plays a role in regulating the inflammatory responses in sepsis-induced acute lung injury via mediating miR-193a-3p

ObjectiveTo explore the role of lncRNA ZFAS1-mediated miR-193a-3p in the regulation of inflammatory responses in rats with sepsis-induced acute lung injury (ALI).MethodsSepsis-induced ALI models were constructed by LPS induction and then injected with ZFAS1 overexpression plasmid. Thereafter, lung injury score and the W/D weight ratio were calculated. Besides, bronchoalveolar lavage fluid (BALF) was isolated from rats to perform the cell count and protein quantification, while qRT-PCR and ELISA were performed to detect the inflammatory cytokines expressions. In vitro, NR8383 cells were transfected and then treated with LPS, followed by the measurement of inflammatory cytokines, cell viability and cell apoptosis.ResultsIn comparison with the Control group, rats in the LPS group presented sharp increases in the W/D weight ratio and injury score of lung, total protein concentration and the count of neutrophils and macrophages in BALF. Besides, rats in LPS group also resulted in a decrease in ZFAS1 expression and increase in miR-193a-3p expression in lung tissues, with the increased pro-inflammatory cytokines. Dual luciferase reporter gene assay confirmed a target relation between miR-193a-3p and ZFAS1. As compared to the Blank group, NR8383 cells in the LPS group had up-regulated pro-inflammatory cytokines with declined cell viability and elevated cell apoptosis; and meanwhile, ZFAS1 and Bcl-2 were decreased but miR-193a-3p and Bax were increased. Overexpression of ZFAS1 could significantly improve LPS-induced ALI in vivo and in vitro with reduced levels of pro-inflammatory cytokines.ConclusionOverexpression of ZFAS1, possibly via targeting the expression of miR-193a-3p, could inhibit the apoptosis and ameliorate the inflammatory responses of ALI in sepsis.     

Inhibitory Effect of Fucoidan on Huh7 Hepatoma Cells Through Downregulation of CXCL12

The aim of this study is to assess whether fucoidan modulates the expression of chemokine ligand 12 (CXCL12)/chemokine receptor 4 (CXCR4) and exerts antitumor activity toward Huh7 hepatoma cells. According to 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays, fucoidan inhibited the growth of Huh7 cells and HepG2 cells in a dose-dependent manner, with a 50% inhibition of cell growth (IC ₅₀ ) of 2.0 and 4.0 mg/ml, respectively. α -fetoprotein levels in medium collected from fucoidan-treated cells were significantly decreased in Huh7 cells but not in HepG2 cells. Western blotting revealed that the amount of α -fetoprotein was decreased by 1.0 mg/ml of fucoidan in Huh7 cells, whereas it was unchanged in HepG2 cells. In Huh7 cells, CXCL12 mRNA expression was significantly downregulated by 1.0 mg/ml of fucoidan, whereas CXCR4 mRNA expression was unchanged by fucoidan. CXCL12 and CXCR4 mRNA were barely expressed in HepG2 cells. In addition, 1.0 mg/ml of fucoidan mildly arrested the cell cycle and induced apoptosis in Huh7 cells. The findings suggest that fucoidan exhibits antitumor activity toward Huh7 cells through the downregulation of CXCL12 expression.     

MicroRNA-21与乳腺癌细胞MDA-MB-231放射敏感性之间关系的研究

目的:研究MicroRNA-21与乳腺癌细胞MDA-MB-231放射敏感性之间关系及其表达规律。方法:①对乳腺癌细胞MDA-MB-231分别转染miR-21 mimics、miR-21 mimics Scramble(阴性对照)、miR-21 inhibitor、miR-21 inhibitorScramble(阴性对照),转染后进行集落形成实验,通过存活分数(Surviving Fraction SF)的变化检测其辐射敏感性是否发生变化;②时程实验:3Gy X-Ray照射后,分别于0、4、8、12、24 h后,实时荧光定量PCR检测miR-21的表达;③量效实验:0、1、2、4、6Gy X-Ray分别照射细胞24 h后,实时荧光定量PCR检测miR-21的表达。结果:MDA-MB-231细胞转染miR-21mimics后,SF明显升高,与正常对照组比较有显著性差异(P<0.05);MDA-MB-231细胞转染miR-21 inhibitor后,SF明显降低,与正常对照组比较有显著性差异(P<0.05);3GyX射线照射乳腺癌细胞株MDA-MB-231后,miR-21表达量上调,与对照组比较差异具有显著性(P<0.05),并在12 h时达到峰值,24 h时恢复到照前水平;miR-21的表达量随着照射剂量的增加而发生变化,2Gy时达到峰值,照射剂量进一步加大,miR-21表达量开始下调,与对照组比较具有显著性差异(P<0.05),6Gy时miR-21表达量明显低于未照射组。结论:miR-21对于增加乳腺癌细胞株MDA-MB-231的辐射抗性具有一定作用。     

Assessment of potential miRNA biomarkers of VERO-cell tumorigenicity in a new line (AGMK1-9T7) of African green monkey kidney cells

Patterns of microRNA expression appear to delineate the process of spontaneous neoplastic development-transformation (SPNDT) occurring in the African green monkey kidney (AGMK) VERO cell line (Teferedegne et al., 2010). Analysis of microarray data identified 6 microRNAs whose high-level of expression peaked when the World Health Organization 10-87 VERO cells became tumorigenic at passage (p) 190. Six miRNAs were identified as potential biomarkers for the expression of the VERO-cell tumorigenic phenotype (Teferedegne et al., 2014). However, the question remained whether these miRNA biomarkers are specific for VERO cells or can be generalizable to other cells originating from African green monkey kidneys. To examine miRNA expression patterns in AGMK cells at lower passage levels and to re-examine the identified miRNAs as biomarkers associated with tumorigenic phenotype of VERO cells in another independently-derived line, we established a new line of African green monkey kidney cells (AGMK1-9T7) by serially passaging kidney cells from another AGM. The AGMK1-9T7 cells became tumorigenic in nude mice at p40. Evaluation of miRNA expression at intervals from p1 to p40 revealed similarities between the evolution of miRNA expression during SPNDT in the AGMK1-9T7 cells and the 10-87 VERO cells. Four of the 6 potential biomarker miRNAs (miR-376a, miR-654-3p, miR-543, miR-134) in our earlier reports were detected by microarray in the AGMK1-9T7 cells; RT-qPCR analysis detected all 6 miRNAs. All 6 of these miRNAs have been associated with human tumors. Detection of the same miRNAs associated with the tumorigenic p40 AGMK1-9T7 cells and tumorigenic 10-87 VERO cells confirmed our proposal that these miRNA represent biomarkers for the tumor-forming ability of AGMK/VERO cells. The similarities of expression of miRNAs in different AGMK cell lines that were established 50 years apart suggest that the process of SPNDT in these non-human primate cells in tissue culture is based upon similar genetic and epigenetic mechanisms.     

LncRNA TUG1通过调控miR-196b-5p调控卵巢癌细胞凋亡和放射敏感性分子作用机制

目的 探讨LncRNA TUG1通过调控miR-196b-5p表达对卵巢癌细胞凋亡和放射敏感性的影响及其潜在的作用机制。方法 运用qRT-PCR和Western blot检测卵巢癌细胞株SKOV3、HO8910、OVCAR3和正常卵巢上皮细胞HOSE中miR-196b-5p和TUG1的表达水平。双荧光素酶报告基因分析法验证TUG1可能的靶基因。建立TUG1抑制表达、miR-196b-5p过表达及si-TUG1和anti-miR-196b-5p共转染的SKOV3细胞株,流式细胞术检测细胞凋亡率。采用克隆形成实验检测各组SKOV3细胞不同剂量X射线照射后的存活情况,曲线拟合计算不同剂量辐射后各放射生物学参数。结果 正常卵巢上皮细胞HOSE相比,卵巢癌细胞SKOV3、HO8910及OVCAR3中miR-196b-5p的表达显著降低,差异有统计学意义(P<0.05),TUG1的表达显著升高,差异有统计学意义(P<0.05)。miR-196b-5p是TUG1的靶基因。TUG1抑制表达或miR-196b-5p过表达均促进SKOV3细胞凋亡,差异有统计学意义(P<0.05)并增加其放射敏感性,差异有统计学意义(P<0.05)。抑制miR-196b-5p表达可部分逆转抑制TUG1表达对SKOV3细胞促进凋亡和增强放射敏感性作用。结论 TUG1可负性调控miR-196b-5p的表达,抑制TUG1表达,可促进卵巢癌细胞凋亡,增加细胞放射敏感性。     

长链非编码RNA AGAP2-AS1在胶质瘤增殖过程中作用机制的研究

目的探究长链非编码RNA AGAP2-AS1在胶质瘤增殖过程中的作用机制。方法选取2018年12月-2019年11月期间的30例胶质瘤患者为观察组,同时期的30例脑外伤患者为对照组。比较两组的组织AGAP2-AS1 mRNA表达量、Ras及ERK1/2蛋白表达情况,并比较观察组中不同分级胶质瘤的AGAP2-AS1 mRNA表达量、Ras及ERK1/2蛋白表达情况,比较转染siRNA AGAP2-AS1与siRNANC的U87及U251细胞克隆数。结果观察组的RNA AGAP2-AS1 mRNA表达量、Ras及ERK1/2蛋白表达显著高于对照组,不同分级胶质瘤的RNA AGAP2-AS1 mRNA表达量、Ras及ERK1/2蛋白表达比较,差异有统计学意义(P<0.05),转染siRNA AGAP2-AS1的U87及U251细胞克隆数显著低于siRNA-NC,差异有统计学意义(P<0.05)。结论长链非编码RNA AGAP2-AS1可通过调控ERK/MAPK信号通路影响胶质瘤的增殖,下调AGAP2-AS1可显著影响胶质瘤细胞的克隆形成能力。     

微小RNA-29a通过沉默信息调节因子2相关酶类1基因调控肝细胞脂肪变性的机制

目的探讨人肝细胞株L02脂肪变性时微小RNA-29a(miR-29a)的表达变化及其靶向沉默信息调节因子2相关酶类1(silent mating type information regulation 2 homolog-1,Sirt1)调节脂肪肝细胞脂肪沉积的机制。方法采用油酸和棕榈酸混合物诱导建立非酒精性脂肪肝细胞模型,验证模型成功后,PCR检测miR-29a和Sirt1的表达变化;生物学预测miR-29a的靶基因;分别转染miR-29a模拟物和抑制剂,过表达miR-29a和抑制miR-29a后再建立人脂肪肝细胞模型。油红O染色观察细胞中脂质蓄积情况并测定甘油三酯含量,荧光定量PCR和免疫印迹法检测Sirt1基因和蛋白表达变化。结果脂肪肝细胞模型组miR-29a相对表达量和甘油三酯含量显著高于对照组(P<0.01),Sirt1相对表达量显著低于对照组(P<0.01);生物学预测Sirt1是miR-29a的靶基因,过表达miR-29a后,细胞内脂滴明显增多,脂肪沉积加重,甘油三酯含量显著增加(P<0.05),细胞中miR-29a的表达显著上调(P<0.01),而Sirt1 mRNA表达显著下调(P<0.05),Sirt1蛋白表达呈下降趋势;与之相反,抑制miR-29a后,细胞中脂滴相对减少,脂肪沉积减轻,甘油三酯含量显著下降(P<0.05),细胞中miR-29a的表达被有效抑制(P<0.01),而Sirt1 mRNA的表达显著上调(P<0.05),Sirt1蛋白表达较对照组呈上升趋势。结论 miR-29a在非酒精性脂肪肝细胞中表达显著上调,miR-29a通过表达上调负调控Sirt1表达从而促进脂肪肝细胞中脂肪沉积。