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Development of Effective Cryopreservation Method for Mouse Oocytes  

Choi, Su-Jin (Laboratory of Reproductive Biology and Infertility, Samsung Cheil Hospital and Women's Healthcare Center)
Kim, Soo-Kyung (Laboratory of Reproductive Biology and Infertility, Samsung Cheil Hospital and Women's Healthcare Center)
Kim, Ji-Sun (Laboratory of Reproductive Biology and Infertility, Samsung Cheil Hospital and Women's Healthcare Center)
Cho, Jae-Won (Laboratory of Reproductive Biology and Infertility, Samsung Cheil Hospital and Women's Healthcare Center)
Jun, Jin-Hyun (Laboratory of Reproductive Biology and Infertility, Samsung Cheil Hospital and Women's Healthcare Center)
Byun, Hye-Kyung (Laboratory of Reproductive Biology and Infertility, Samsung Cheil Hospital and Women's Healthcare Center)
Publication Information
Clinical and Experimental Reproductive Medicine / v.31, no.1, 2004 , pp. 75-81 More about this Journal
Abstract
Objective: The purpose of this study was to evaluate the efficacy and effect of various cryopreservation method on the survival and the cytoskeletal stability of metaphase II mouse oocyte. Methods: Mouse ovulated oocytes were collected and cryopreserved by a modified slow-freezing method with 1.5 M 1, 2-propanediol (PrOH)+0.1 M sucrose or by vitrification using cryo loop and EM grid with 40% ethylene glycol+0.6 M sucrose. Four hours after thawing, intact oocytes were fixed and stained with fluorescein isothiocyanate (FITC)-conjugated monoclonal anti-$\beta$-tubulin antibody to visualize spindle and propidium iodide (PI) to visualize chromosome. Spindle morphology was classified as follows: normal (barrel-shaped), slightly and absolute abnormal (multipolar or absent). Results: Survival rate of the frozen-thawed oocytes in vitrification group was significantly higher than that of slow-freezing group (62.7% vs. 24.4%, p<0.01). Vitrification with cryo loop showed significantly higher survival rate than that with EM grid (67.7% vs. 53.5%, p<0.05). On the other hand, proportion of normal spindle and chromosome configurations of the frozen-thawed oocytes between two vitrification group was not significantly different. Conclusion: For mouse ovulated oocytes, vitrification with cryo loop may be a preferable procedure compared to slow-freezing method. Further study should be needed to investigate developmental competency of frozen-thawed mouse oocytes.
Keywords
Mouse oocyte; Vitrification; Slow-freezing; Spindle; Chromosome;
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Times Cited By KSCI : 1  (Citation Analysis)
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