Effects of hydrosalpingeal fluid on murine embryo development and implantation

Purpose: Our purpose was to evaluate the effects of various concentrations of hydrosalpingeal fluid (HSF) on the preimplantation development and implantation of murine embryos. Methods: One-cell mouse embryos were cultured in KSOM culture medium with 0.1, 1.0, 10, or 50% HSF: without and with lactate supplementation. Late-stage embryos were transferred into the uteri of pseudopregnant CD-1 females to determine implantation rates. The embryo transfer technique used was developed by our group and its effectiveness was evaluated during this experiment. Results: Blastocyst development in the 0.1, 1.0, 10, and 50% group was 45 55.0 12.5, and 17.5%, respectively, with lactate supplementation, and 35.0 52.5, 12.5, and 5.0%, respectively, without lactate supplementation, while in the KSOM (control) group it was 63. 8%. Blastocyst development was reduced compared to controls in the 10% HSF and 50% HSF groups. Implantation rates for the 0.1 and 1.0% groups with lactate supplementation were 43.0 and 25.0%, respectively, and those with lactate supplementation were 50.6 and 61.8%, respectively, while in the KSOM group the implantation rare was 65.5%. None of the implantation rates were significantly different. Conclusions: Hydrosalpingeal fluid has a concentration-dependent inhibitory effect on in vitro murine embryo development, but it has minimal effects on implantation rates.