简介:MYBtranscriptionfactorsrepresentafamilyofgenesthatincludetheconservedMYBDNA-bindingdomain,andtheyarewidelyinvolvedintheregulationofplantdevelopmentandsecondarymetabolism.Inthisstudy,PartofsequencesoftwoMYBtranscriptionfactorswasdeterminedthroughthecDNAmicroarrayhybridizationandselectionofcDNAlibraryderivedfromtendershoots.Thefull-lengthcDNAsofthegeneswereobtainedwithRT-PCRandRACE,andtheywere1132bpand1020bp,namedasCsMYB1andCsMYB2(GenBankaccessionNo.HQ660373andHQ660374),andcontainedORFsof879bpand675bpencoding292and224aminoacids,respectively.Sequencesanalysisshowedthatthededucedproteinmolecularweightofthetwogeneswere32.9kuand25.4ku,andtheproteinscontainedtwoconservedMYBdomainsneartheN-terminusandaconservedC1motifneartheR3domains.ThededucedaminoacidsequenceofCsMYB1andCsMYB2fromteaplantshowedhighidentitywiththatofotherplants,forinstanceCsMYB1shared57%homologywithMYB1ofGossypiumhirsutumandCsMYB2shared75%homologywithMYBC2ofVitisvinifera.Theresultofrealtime-PCRanalysisshowedthetwogeneswereexpressedconstitutivelyinalltissueswithdifferentexpressionlevels,e.g.therelativeexpressionlevelofCsMYB2inleafwashundredtimeshigherthanthatinroot.Additionally,shadingenhancedCsMYB1expression,whilethetreatmentdidnotaltertheexpressionlevelofCsMYB2.
简介:AIM:Toinvestigatetheeffectsofc-mybantisenseRNAoncellproliferationandtheexpressionofc-myb,TGF-β1andα1-Ⅰcollageninculturedhepaticstellatecells(HSC)fromrats.METHODS:Recombinantretroviralvectorofc-mybantisensegene(pDOR-myb)wasconstructed,andthentransfectedintoretroviralpackagecelllinePA317bymeansofDOTAP.ThepseudovirusesproducedfromtheresistantPA317cellswereselectedwithG418toinfectHSCsisolatedfromratlivers.Thecellproliferationwasmeasuredby3-[4,5-Dimethylthiazolzyl]-2,5-diphenyltetrazo-diumbromide(MTT)method.Theexpressionofc-myb,α1-ⅠcollagenandTGF-β1rnRNA,andc-mybproteininHSCswasdetectedwithsemi-quantitivereversetranseription-polymerasechainreaction(RT-PCR)andWestern-blotrespectively.RESULTS:HSCsfromratswereisolatedsuccessfullywiththeviability>98%.InthepDOR-mybinfectedHSCs,thecmybproteinexpression,cellproliferation,andα1-ⅠcollagenandTGF-β1mRNAexpressionwererepressedsignificantlycomparedwiththeircorrespondingcontrolgroups(P<0.01).CONCLUSION:c-mybplaysakeyroleinactivationandproliferationofHSC.c-mybantisenseRNAcaninhibitcellproliferation,α1-ⅠcollagenandTGF-β1mRNAexpression,suggestingthatinhibitionofc-mybgeneexpressionmightbeapotentialwayforthetreatmentofliverfibrosis.