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The survival and development rates in mouse embryo cryopreservation
1Department of Obstetrics & Gynecology, Chang Gung Memorial Hospital, Taipei, Taiwan, R.O.C.
Changgeng Yi Xue Za Zhi
|December 1, 1991
Summary
Mouse embryo cryopreservation techniques were refined, significantly improving survival and development rates. Propanediol showed better blastocyst development compared to dimethyl sulfoxide in mouse embryo cryopreservation.
Area of Science:
- Reproductive Biology
- Cryobiology
- Embryology
Background:
- Establishing a clinical service for human embryo cryopreservation requires validated animal models.
- Mouse embryos were used to optimize cryopreservation protocols.
Purpose of the Study:
- To improve mouse embryo cryopreservation techniques for future human applications.
- To compare the efficacy of propanediol (PROH) and dimethyl sulfoxide (DMSO) as cryoprotectants.
Main Methods:
- Mouse embryos were cryopreserved using 1.5M PROH or 1.5M DMSO.
- A modified four-step equilibration method was employed.
- Embryos were analyzed in two phases to assess improvements in handling and timing.
Main Results:
- Survival rates improved from 25% to 59.8% and stage advancing rates from 5.2% to 33.5% between phases.
- Development to hatched blastocysts increased significantly from 14.5% to 56.7% in 4-cell embryos.
- Propanediol resulted in better blastocyst development (64.0%) compared to DMSO (41.5%) in 4-cell embryos.
Conclusions:
- Refined cryopreservation techniques enhance mouse embryo survival and developmental potential.
- Propanediol may be a superior cryoprotectant for blastocyst development.
- The study's success supports initiating clinical trials for human embryo cryopreservation, with early pregnancies established.