摘要Objective:Our study aimed to assess the effects of Growth and differentiation factor 11(GDF11)on the function of endothelial progenitor cells in middle-age individuals(EPCs-MA)isolated from mouse bone marrow and to explore the mechanistic relationship between GDF11 and age-related ALP impairment.Methods:Bone marrow-derived EPCs were isolated,culture and GDF11 treatment.In vivo,the mice model of myocardial ischemia(MI)was induced by permanent ligation of the left anterior descending coronary artery(LAD)and mice were randomly divided into MI group and EPCs transplantation group(EPCs-Y,EPCs-MA,EPCs-MA/GDF11).The positive effect of GDF11 treatment of EPCs-MA on MI was verified by echocardiography and the average ratio of fibrotic area to left ventricular(LV)area.In vitro,the effect of GDF11 on ameliorating EPCs aging by promoting autophagy was confirmed by transwell assay,immunofluorescence staining,characterization of EPCs ultrastructure through transmission electron microscope(TEM),lysosome imaging and Western blot.Result:Our findings demonstrate that GDF11 enhances the migration capacity of EPCs-MA and improves recovery of impaired cardiac function after myocardial infarction(MI)in mice,with EPCs isolated from young mice(EPCs-Y)as controls.Moreover,GDF11 restored functional phenotypes of EPCs-MA to levels akin to EPCs-Y,promoting the expression of CD31,endogenous NO synthase,and the restoration of von Willebrand factor(vWF)and CDH5 expression patterns,as well as the formation of Weibel-Palade bodies—key organelles for storage and secretion in endothelial cells and EPCs.Furthermore,GDF11 significantly enhanced the autophagic clearance capability of EPCs-MA by promoting ALP.Conclusions:Our results suggest that GDF11 ameliorates cardiac function impairment by restoring the activities of EPCs from aging mice through enhanced ALP.These findings suggest that GDF11 may hold therapeutic potential for improving aging-related conditions associated with declined autophagy.