title: Embryologic outcome and secretome profile of implanted blastocysts obtained after coculture in human endometrial epithelial cells versus the sequential system.
abstract: OBJECTIVE
  To compare embryologic and clinical outcomes in terms of preimplantation development, implantation, pregnancy rates, and secretome profile of implanted blastocysts from the preimplantation genetic diagnosis program grown in sequential versus endometrial epithelial cell (EEC) coculture system.
  
  
  METHODS
  Retrospective clinical study and prospective experimental study.
  
  
  METHODS
  In vitro fertilization clinical unit and university research laboratory.
  
  
  METHODS
  Blastomere biopsy, embryo culture, blastocyst transfer, and protein analysis of the media conditioned from implanted embryos obtained from coculture and sequential systems.
  
  
  METHODS
  Clinical study: blastocyst, implantation, and gestation rates in own and donated oocytes. Experimental study: differential protein analysis of implanted embryos grown in coculture system versus sequential system.
  
  
  RESULTS
  Of the 12,377 embryos analyzed, the blastocyst rates were 56.0% versus 45.9% in the coculture versus the sequential system, respectively, with own oocytes. With ovum donation, the rates were 70.5% versus 56.4%, respectively. Reproductive outcomes in terms of pregnancy rates (39.1% vs. 27.5%) and implantation rates (33.3% vs. 20.9%,) were statistically higher in EEC coculture versus sequential media. Furthermore, the protein profile of the EEC coculture versus the sequential system was obtained. Interleukin-6 (IL-6) was the most secreted protein by the EEC culture. Further ELISA experiments showed that the IL-6 present in the sequential medium diminished in implanted blastocysts.
  
  
  CONCLUSIONS
  The coculture system favors blastocyst development and implantation rates, given the contribution of the factors secreted by endometrial epithelial cells, such as IL-6.
authors.affiliation: Fundación IVI, Instituto Universitario IVI, University of Valencia, C/Guadassuar 1 bajo, 46015 Valencia, Spain. fdominguez@ivi.es
authors.forename: Francisco
authors.initials: F
authors.lastname: Dominguez
authors.forename: Blanca
authors.initials: B
authors.lastname: Gadea
authors.forename: Amparo
authors.initials: A
authors.lastname: Mercader
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Esteban
authors.forename: Antonio
authors.initials: A
authors.lastname: Pellicer
authors.forename: Carlos
authors.initials: C
authors.lastname: Simón
mesh_terms: D015415:Biomarkers / Q000378:metabolism; D001755:Blastocyst / Q000166:cytology / Q000378:metabolism*; D018920:Coculture Techniques; D019295:Computational Biology; D017077:Culture Media, Conditioned / Q000378:metabolism; D046149:Embryo Culture Techniques / Q000379:methods*; D010064:Embryo Implantation; D004717:Endometrium / Q000166:cytology*; D004847:Epithelial Cells / Q000166:cytology*; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D015850:Interleukin-6 / Q000378:metabolism; D018587:Oocyte Donation; D011247:Pregnancy; D019836:Preimplantation Diagnosis; D040081:Protein Array Analysis; D012189:Retrospective Studies; D056826:Single Embryo Transfer
chemical_list: D015415:Biomarkers; D017077:Culture Media, Conditioned; C508600:IL6 protein, human; D015850:Interleukin-6