Vero cell effect on in-vitro human blastocyst development: preliminary results

Area of Science:

• Reproductive biology
• Cell biology
• In-vitro fertilization (IVF) technologies

Background:

• Asynchrony between embryo and uterine receptivity is a key limitation in human IVF.
• Current IVF culture systems may not adequately support prolonged embryo development to the blastocyst stage.
• Improved embryo viability and culture conditions are crucial for increasing IVF success rates.

Purpose of the Study:

• To develop and evaluate an in-vitro co-culture system using Vero cells to enhance human embryo development.
• To investigate the potential of Vero cells to improve embryonic cleavage rates and viability.
• To assess the impact of Vero cell co-culture on blastocyst formation and clinical pregnancy rates in IVF.

Main Methods:

• Development of an in-vitro co-culture system utilizing Vero cells as a feeder layer for human embryos.
• Co-culture of fertilized human embryos with Vero cells up to the blastocyst stage.
• Evaluation of blastocyst development rates and pregnancy outcomes in patients undergoing IVF.

Main Results:

• Co-culture with Vero cells supported human early embryo development to the blastocyst stage in 68% of cases.
• A 50% pregnancy rate per transfer was observed in patients with a history of implantation failures.
• Significant increases in clinical pregnancy rates were noted when zygotes were cultured on Vero cells for 24 hours.

Conclusions:

• Vero cell co-culture provides effective support for human early embryo development, promoting progression to the blastocyst stage.
• This co-culture system shows promise for improving IVF success rates, particularly in patients with recurrent implantation failure.
• The beneficial effects are likely due to embryotrophic factors released by Vero cells and medium detoxification.