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http://dx.doi.org/10.12750/JET.2014.29.3.241

Development of Effective Cryopreservation Method for Mammalian Embryo  

Kim, Hyun (Department of Veterinary Physiology, Graduate School of Agricultural and Life Sciences, The University of Tokyo)
Cho, Young Moo (Animal Genetic Resources Station, National Institute of Animal Science, RDA)
Ko, Yeoung-Gyu (Animal Genetic Resources Station, National Institute of Animal Science, RDA)
Kim, Sung Woo (Animal Genetic Resources Station, National Institute of Animal Science, RDA)
Seong, Hwan-Hoo (Animal Genetic Resources Station, National Institute of Animal Science, RDA)
Yamanouchi, Keitaro (Department of Veterinary Physiology, Graduate School of Agricultural and Life Sciences, The University of Tokyo)
Publication Information
Journal of Embryo Transfer / v.29, no.3, 2014 , pp. 241-248 More about this Journal
Abstract
This study was carried out to evaluate the effects of embryonic stage, cryoprotectant, and freezing-thawing method on the rates of survival and development of the cryopreserved mouse early embryo and finally to establish the cryopreservation method of surplus embryos obtained during assisted reproductive technology (ART). Two to eight cell embryos were obtained from oviducts of mated $F_1$ hybrid female mice superovulated by PMSG and hCG. Two-step EG, DMSO and 4-step EG, DMSO were used as cryoprotectant and dehydration and rehydration method of embryos, and slow-cooling or rapid-cooling method was used as frozen program. The survival rates of embryos were measured after thawing and rehydration, and the developmental rates of embryos were compared and observed during culturing embryos for 24, 48, 72, 96 hrs. As for the survival and development rates of embryos according to embryonic stage, the survival rate of 2 cell stage in EG and DMSO was significantly higher than 4~8 cell (65.4% versus 61.2%, 81.1% versus 72.5%) (p<0.01, p<0.01), but the development rates of 4~8 cell embryos in EG and DMSO were significantly higher than 2 cell embryos for whole culture period (p<0.01) and the development rates of 4~8 cell embryos in EG were significantly higher than 2 cell embryos in DMSO (p<0.01). As for the survival and development rates of embryos according to cryoprotectant, the survival rate of 2 cell embryo in DMSO was significantly higher than that in EG(77.0% versus 64.4%) (p<0.01), whereas the development rate of embryos was not differ till 24 hrs. The development rate from morular to hatching blastocyst, however, was sinificantly higher in EG than in DMSO during 48 hr (p<0.01). The survival rate of 4~8 cell embryo was 62.5% in EG and 73.3% in DMSO. The development rates of embryo in EG were significantly higher for whole culture periods (p<0.01, 0.05). In respect to the effect of freezing and thawing program on the survival and development rates of embryos, method of slow cooling and rapid thawing was more effective than that of rapid cooling and rapid thawing. The survival rate of embryo in 2 cell stage was higher than in 4~8 cell stage, and EG appears more effective cryoprotectant than DMSO because EG showed better development rates of embryos in 2 and 4~8 cell stage. Moreover, slow cooling and rapid thawing method was considered as the best cryopreservation program.
Keywords
cryopreservation; mouse embryo; EG; DMSO;
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