Vitrification of mouse embryos using the thin plastic strip method

Area of Science:

• Reproductive biology
• Cryobiology
• Developmental biology

Background:

• Vitrification is a key technique for cryopreserving embryos.
• Optimizing vitrification methods is crucial for improving embryo survival and developmental potential.
• Different container types can influence the efficiency of vitrification and warming processes.

Purpose of the Study:

• To compare the efficacy of three different containers—electron microscopy (EM) grid, cryotop, and thin plastic strip (TPS)—for mouse embryo vitrification.
• To evaluate the impact of these containers on embryo developmental competence and apoptosis rates post-thaw.

Main Methods:

• Mouse embryos at various developmental stages were vitrified using EM grid, cryotop, or TPS containers.
• A standardized vitrification solution (15% ethylene glycol, 15% dimethylsulfoxide, 10 µg/mL Ficoll, 0.65 M sucrose, and 20% serum substitute supplement) was used.
• Post-thaw assessment included survival, re-expansion, hatching rates, and apoptosis evaluation.

Main Results:

• Vitrification using cryotop and TPS containers resulted in significantly higher developmental competence compared to the EM grid for expanded and hatching-stage blastocysts.
• Apoptosis rates were significantly lower in embryos vitrified with cryotop and TPS compared to the EM grid.
• Both cryotop and TPS demonstrated superior outcomes over the EM grid in preserving embryo viability.

Conclusions:

• The thin plastic strip (TPS) vitrification method provides excellent developmental ability and effective embryo preservation.
• Cryotop and TPS are more effective than the EM grid for mouse embryo vitrification, offering better developmental outcomes and reduced apoptosis.
• Further research into TPS may lead to improved assisted reproductive technologies.