简介：微小核糖核酸（microRNA）作为一类内源性、进化上高保守、由20～22个核苷酸构成的单链非编码RNA[1],广泛分布于真核生物中,人类身体上已有超过2500个microRNA被确认[2].人类基因组中有20％～30％的基因受microRNA调控,一个microRNA可调控多个靶标,一个基因可被多个microRNA共同调控[3,4].

简介：微小核糖核酸（microRNAs,简称miRNAs）是一类广泛存在于动物和人类中的内源性小分子非编码单链RNA,具有高度的结构、物种保守性,严格的时序性及组织特异性,因此其在物种进化中相当保守,是调节其他功能基因表达的重要调节分子,

简介：BackgroundAtrialfibrillation(AF)isthemostcommonsustainedcardiacarrhythmiawithouteffectivetreatment.AFisassociatedwithatrialconductiondisturbancescausedbyelectricaland/orstructuralremodel-ing.Buttheroleofconnexin(Cx)43intheregulationofLtypecalciumchannel(LCC)remainsunclear.WehypothesizedthatCx43mightco-localizeandregulatetheLtypecalciumchannelcurrent(ICa,L).MethodsReal-timePCRandwhole-cellpatchclampwereusedtodetecttheexpressionofLCC1csubunitandthecurrentdensityofICa,L,beforeandafterCx43knockingdownrespectively.Theco-localizationofCx43withLCCwasinvestigatedbyco-immunoprecipitationandconfocalmicroscopy.ResultsKnockingdownofCx43significantlyinhibitedthecurrentdensityofICa,LthroughdecreasingthegeneexpressionofLCCα1cinculturedatrium-derivedmyocytes(HL-1cells).Cx43co-localizedwithLCCα1csubunitinatrialmyocytes.ConclusionsCx43regulatestheICa,LinatrialmyoctyesthroughLCC,representingapotentialpathogenicmechanisminatrialarrhythmias.