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Besides, stromal\u2010derived factor 1 (SDF1a) functions as cardiac repair after myocardial infarction (MI). Therefore, the present study aims to identify whether exosomes (Exo) released from SDF1\u2010overexpressing MSCs display a beneficial effect on ischemic myocardial infarction. Initially, a gain\u2010of\u2010function study was performed to investigate the function of SDF1 in ischemic myocardial cells and cardiac endothelial cells. Coculture experiments were performed to measure potential exosomic transfer of SDF1 from MSCs to ischemic myocardial cells and cardiac endothelial cells. During the coculture experiments, exosome secretion was disrupted by neutral sphingomyelinase inhibitor GW4869 and upregulated exosomal SDF1 using SDF1 plasmid. Effects of Exo\u2010SDF1 on cardiac function in MI mice were investigated in vivo. MSCs suppressed myocardial cell apoptosis and promoted microvascular regeneration of endothelial cells through secretion of exosomes. The addition of GW4869 led to increased apoptotic capacity of myocardial cells, decreased microvascular formation ability of endothelial cells, enhanced autophagy ability, and elevated Beclin\u20101 level as well as ratio of LC3II\/LC3I. Overexpression of SDF1 and Exo\u2010SDF1 inhibited apoptosis and autophagy of myocardial cells, but promoted tube formation of endothelial cells. The interference of PI3K signaling pathway promoted apoptosis and autophagy of myocardial cells, but inhibited tube formation of endothelial cells. SDF1 activated the PI3K signaling pathway. Exo\u2010SDF1 protected cardiac function of MI mice and inhibited myocardial tissue damage. This study provided evidence that SDF1 overexpression in MSCs\u2010derived exosomes inhibited autophagy of ischemic myocardial cells and promoted microvascular production of endothelial cells.<\/jats:p>","DOI":"10.1002\/jcp.28070","type":"journal-article","created":{"date-parts":[[2019,2,5]],"date-time":"2019-02-05T09:05:54Z","timestamp":1549357554000},"page":"13878-13893","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":128,"title":["RETRACTED: Exosomes derived from SDF1\u2010overexpressing mesenchymal stem cells inhibit ischemic myocardial cell apoptosis and promote cardiac endothelial microvascular regeneration in mice with myocardial infarction"],"prefix":"10.1002","volume":"234","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0513-6674","authenticated-orcid":false,"given":"Xu\u2010He","family":"Gong","sequence":"first","affiliation":[{"name":"Department of Cardiology Beijing Friendship Hospital, Capital Medical University Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Cardiology State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences &amp; Peking Union Medical College Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Si\u2010Jia","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Emergency Beijing Friendship Hospital, Capital Medical University Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Si\u2010Wen","family":"Liang","sequence":"additional","affiliation":[{"name":"Department of Cardiology Beijing Friendship Hospital, Capital Medical University Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guo\u2010Gan","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Cardiology State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences &amp; Peking Union Medical College Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,2,5]]},"reference":[{"key":"e_1_2_8_1_2_1","doi-asserted-by":"publisher","DOI":"10.1186\/1479-5876-9-150"},{"issue":"1","key":"e_1_2_8_1_3_1","first-page":"130","article-title":"Exosomes from breast cancer cells can convert adipose tissue\u2010derived mesenchymal stem cells into myofibroblast\u2010like cells","volume":"40","author":"Cho J. 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