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TrophoblastStem-Cell-DerivedExosomesImproveDoxorubicin-InducedDilatedCardiomyopathybyModulatingthelet-7i/YAPPathway.
Trophoblaststemcells(TSCs)havebeenconfirmedtoplayacardioprotectiveroleinheartfailure.However,whetherTSC-derivedexosomes(TSC-exos)canprotectagainstcardiacinjuryremainsunclear.Inthepresentstudy,TSC-exoswereisolatedfromthesupernatantofTSCsusingtheultracentrifugationmethodandcharacterizedbytransmissionelectronmicroscopyandwesternblotting.UtilizingthepublicGeneExpressionOmnibus(GEO)database,wefoundthatlet-7iandYes-associatedprotein1(YAP)couldparticipateinthedevelopmentofheartfailure.Invitro,AC16cardiomyocytessubjectedtodoxorubicin(DOX)weretreatedwithTSC-exosorlet-7imimic.FlowcytometryshowedthatTSC-exosandlet-7ibothdecreasedcardiomyocyteapoptosis.Invivo,micethatwereintraperitoneallyinjectedintoDOXreceivedeitherPBS,TSC-exos,orAAV9-let7iupforlet-7ioverexpression.MicereceivingTSC-exosandAAV9-let7iupshowedimprovedcardiacfunctionanddecreasedinflammatoryresponses,ac