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The aim of this study was to assess the role in the implantation of mediators in the endometrial milieu. Total secretome (TS), soluble secretome (SS) and small extracellular vesicles (containing exosomes) were generated from hormonally primed human endometrial epithelial cell culture medium. Human trophectoderm stem cell-derived spheroids were cultured with TS, SS or exosomes (30 \u00b5g\/ml) on hormonally primed epithelial cells, with exosomes significantly increasing cell adhesion and outgrowth. Furthermore, F1 mouse 2-cell embryos were cultured in groups for 48 h followed by culture with each secretome fraction (30 \u00b5g\/ml) for 48 h. Blastocyst cell number and hatching were quantified. In addition, blastocysts were further cultured on a fibronectin matrix for 72 h or transferred to recipient mice (with corresponding secretomes) with embryo implantation assessed after 6 days. Exosomes significantly increased total cell number in mouse embryos and complete hatching from zona pellucida, with both exosomes and SS significantly enhancing mouse embryo outgrowth. Importantly, exosomes increased the embryo implantation rate in comparison to other secretome fractions (normalized based on treatment amount) from the endometrial epithelia. These data indicate that endometrial epithelial exosomes support embryo growth, development and implantation while the SS has selective involvement specifically on mouse embryo outgrowth. This finding provides new insights into the molecular differences of endometrial secretome components in implantation and early embryo development and may implicate endometrial exosomes in the pathophysiology of implantation failure in infertility.<\/jats:p>","DOI":"10.1093\/molehr\/gaaa034","type":"journal-article","created":{"date-parts":[[2020,5,8]],"date-time":"2020-05-08T11:10:35Z","timestamp":1588936235000},"page":"510-520","source":"Crossref","is-referenced-by-count":72,"title":["Exosomes and soluble secretome from hormone-treated endometrial epithelial cells direct embryo implantation"],"prefix":"10.1093","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9003-652X","authenticated-orcid":false,"given":"S","family":"Gurung","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia; Centre for Reproductive Health, Hudson Institute of Medical Research, Clayton, Victoria,\u00a0Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D W","family":"Greening","sequence":"first","affiliation":[{"name":"Molecular Proteomics Laboratory, Baker Heart and Diabetes Institute, Melbourne, Victoria,\u00a0Australia"},{"name":"Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria,\u00a0Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S","family":"Catt","sequence":"first","affiliation":[{"name":"EPRD, Department of Obstetrics and Gynecology, Monash University Melbourne, Victoria,\u00a0Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0558-7325","authenticated-orcid":false,"given":"L","family":"Salamonsen","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia; 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