简介:目的探讨微小RNA(miR)-181a对唾液腺腺样囊性癌(SACC)细胞增殖能力的体内外作用影响。方法通过过表达或沉默miR-181a在SACC-LM和SACC-83细胞中的表达。实时荧光定量PCR检测转染后SACC细胞株中miR-181a的表达水平。MTT法检测miR-181a对SACC细胞体外增殖能力的影响。Westernblot检测转染后生长因子因子表达的改变。裸鼠皮下移植瘤模型检测miR-181a对SACC细胞体内增殖能力的影响。采用SPSS17.0软件对数据进行统计学处理,以P<0.05为差异具有统计学意义。结果实时荧光定量PCR结果示,转染后SACC-LM细胞中miR-181a表达升高(t=-9.198,P=0.012),而SACC-83细胞中miR-181a表达降低(t=-7.241,P=0.019);SACC-LM细胞增殖能力降低(t=-4.58,P=0.045),而SACC-83细胞增殖能力提高(t=3.016,P=0.03);SACC-LM细胞中转化生长因子β2(TGF-β2)、神经生长因子(NGF)和血管内皮生长因子(VEGF)的表达水平均下调,而SACC-83细胞中TGF-β2、NGF和VEGF的表达水平均升高。裸鼠皮下移植瘤模型结果显示,miR-181amimics组移植瘤瘤体明显小于mimicsNC组(t=-4.692,P=0.043)。结论miR-181a能抑制SACC细胞体内体外的增殖能力。
简介:IntheapplicationofRNAitechnology,itisanessentialsteptodesignsiRNAapplicabletotargetgene.Atpresent,therearemanyresearchesandconclusionsonsiRNAdesign.ThispaperaimstotheinfluencesofmRNAsecondarystructureorsiRNAantisense-strandsecondarystructureonsiRNAsilenceefficiency.Thepaperalsodiscussestheproblemsandsetsoutfurtherinsightsintheresearch.
简介:摘要本文致力于探讨班主任工作的改革与创新。一个班级是否优秀,在很大程度上取决于班主任工作的指导思想是否正确、具体方法的运用是否得当、是否符合学生心理和生理发展的特点。作者在近十年的班主任工作经历中不断尝试改革、创新,总结出一套卓有成效的成熟的管理模式。
简介:SmallRNA(sRNA)-mediatedpost-transcriptionalregulationdiffersfromprotein-mediatedregulation.Throughbasepairing,sRNAcanregulatethetargetmRNAinacatalyticorstoichiometricmanner.Sometheoreticalmodelswerebuiltforcomparisonoftheprotein-mediatedandsRNA-mediatedmodesinthesteady-statebehaviorsandnoiseproperties.ManyexperimentsdemonstratedthatasinglesRNAcanregulateseveralmRNAs,whichcausescrosstalkbetweenthetargets.Here,wefocusonsomemodelsinwhichtwotargetmRNAsaresilencedbythesamesRNAtodiscusstheircrosstalkfeatures.Additionally,thesequence-functionrelationshipofsRNAanditsroleinthekineticprocessofbase-pairinghavebeenhighlightedinmodelbuilding.
简介:Longnon-codingRNAs(lncRNAs)refertoagroupofRNAsthatareusuallymorethan200nucleotidesandarenotinvolvedinproteingeneration.Instead,lncRNAsareinvolvedindifferentregulatoryprocesses,suchasregulationofgeneexpression.DifferentlncRNAsexistthroughoutthegenome.LncRNAsarealsoknownfortheirrolesindifferenthumandiseasessuchascancer.HOTAIRisanlncRNAthatplaysaroleasanoncogenicmoleculeindifferentcancercells,suchasbreast,gastric,colorectal,andcervicalcancercells.Therefore,HOTAIRexpressionlevelisapotentialbiomarkerfordiagnosticandtherapeuticpurposesinseveralcancers.ThisRNAtakespartinepigeneticregulationofgenesandplaysanimportantroleindifferentcellularpathwaysbyinteractingwithPolycombRepressiveComplex2(PRC2).Inthisreview,wedescribethemolecularfunctionandregulationofHOTAIRanditsroleindifferenttypesofcancers.