Embryologic outcome and secretome profile of implanted blastocysts obtained after coculture in human endometrial epithelial cells versus the sequential system
Received 20 August 2008; received in revised form 30 September 2008; accepted 15 October 2008. published online 04 December 2008.
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.
Design
Retrospective clinical study and prospective experimental study.
Setting
In vitro fertilization clinical unit and university research laboratory.
Intervention(s)
Blastomere biopsy, embryo culture, blastocyst transfer, and protein analysis of the media conditioned from implanted embryos obtained from coculture and sequential systems.
Main Outcome Measure(s)
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.
Result(s)
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.
Conclusion(s)
The coculture system favors blastocyst development and implantation rates, given the contribution of the factors secreted by endometrial epithelial cells, such as IL-6.
aFundación IVI, Instituto Universitario IVI, University of Valencia, Valencia, Spain
bDepartment of Pediatrics, Obstetrics, and Gynecology, Valencia University School of Medicine, Valencia, Spain
cDepartment of Experimental Biology, University of Jaén, Jaén, Spain
Reprint requests: Dr. Francisco Dominguez, Fundación Instituto Valenciano de Infertilidad (FIVI), C/Guadassuar 1 bajo, 46015—Valencia, Spain (FAX: +34 96 3455512).
F.D. has nothing to disclose. B.G. has nothing to disclose. A.M. has nothing to disclose. F.E. has nothing to disclose. A.P. has nothing to disclose. C.S. has nothing to disclose.
The first two authors contributed equally to this work.
ABSTRACT