Abstract
Purpose: Our purpose was to evaluate the beneficial effects of long-term coculture of Vero cells on the development of frozen–thawed two-cell mouse embryos.
Methods: Two-cell mouse embryos were frozen slowly with 1,2-propandiol and sucrose as cryoprotectants and thawed rapidly, followed by stepwise dilution. Vero cells were cultured in drops of RPMI 1640 to establish monolayers. Frozen–thawed embryos were cultured alone (control) or cocultured with Vero cells. The rate of development in both groups was compared.
Results: After 4 days of culture, significantly more embryos in coculture were developed to expanded blastocysts (61 vs 37% for controls; P ≤ 0.0001). In addition, on the fifth day of cultivation, more embryos in coculture showed the potential of hatching from the zona pellucida (26 vs 7% in controls; P ≤ 0.0001). The rate of degeneration in coculture was also much lower than in controls (6 and 15%, respectively).
Conclusions: Coculture of cryopreserved preimplantation-stage embryos with Vero cells seems to be a useful tool to eliminate the postthaw deleterious effect of freezing and also to obtain better-quality embryos appropriate for transfer.
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Nematollahi, N., Rezazadeh Valojerdi, M. Effect of Vero Cell Coculture on the Development of Frozen–Thawed Two-Cell Mouse Embryos. J Assist Reprod Genet 16, 380–384 (1999). https://doi.org/10.1023/A:1020598031275
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DOI: https://doi.org/10.1023/A:1020598031275