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Comparison of Vitrification and Slow Freezing for the Cryopreservation of Mouse Pronuclear Stage Embryos  

Kim, Mi-Young (Department of Obstetrics and Gynecology, Chonnam National University Medical School)
Lee, Yu-Il (Department of Obstetrics and Gynecology, Chonnam National University Medical School)
Publication Information
Clinical and Experimental Reproductive Medicine / v.34, no.2, 2007 , pp. 117-124 More about this Journal
Abstract
Objective: The aim of this study was to compare the efficacy of slow freezing with vitrification method for cryopreservation of mouse pronuclear stage embryos. Methods: Mouse pronuclear embryos obtained from superovulated mice and classified into 2 groups of slow freezing and vitrification. Slow freezing solution consisted of 1.5 M PROH, 0.1 M sucrose, while vitrification solution consisted of 40% ethylene glycol, 18% Ficoll and 0.5 M sucrose diluted in Dulbecco's phosphate-buffered saline supplemented with 10% SSS. Recovery and survival rates after thawing and development rates to hatching balstocyst stage were compared between two groups. Results: After freezing and thawing, recovery rate of slow freezing group was 93.8%, whereas vitrification group was 66.5% (p<0.01). Survival rate of recovered embryos were similar between two groups as 83.2% in slow freezing and 87.6% in vitrification. Embryo development rates to 2-cell stage after 24 hrs (77.0% vs 59.1%), 4-cell after 48 hrs (72.6% vs 53.3%), blastocyst after 96 hrs (53.1% vs 40.1%) of thawing were significantly higher in vitrification group than those of slow freezing group, respectively. Conclusion: The vitrification method may provide better developmental competence of frozen-thawed embryos than that of slow freezing method for cryopreservation of mouse pronuclear stage embryos.
Keywords
Mouse pronuclear embryo; Vitrification; Slow freezing; Embryo development; Blastocyst;
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