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Korean Journal of Reproductive Medicine 2008;35(4):275-283.
Published online December 1, 2008.
Effects of the Artificial Shrinkage and Assisted Hatching Before Vitrification on the Development of the Vitrified Mouse Expanding Blastocysts.
Deok Hyeon Jo, Gyoung Rae Ko, Ji Hye Jung, Jong Ryeol Choi, Jong Kil Joo, Kyu Sup Lee
1Department of Obstetrics and Gynecology, School of Medicine, Pusan National University, Busan, Korea.
2Clinic of Infertility, Pusan National University Hospital, Busan, Korea.
Abstract
OBJECTIVE
This study was conducted to investigate the effects of the artificial shrinkage and assisted hatching (PZD; patial zona dissetion) before vitrification on the development of vitrified mouse expanding blastocyst. METHODS: Mouse 2-cell embryos were collected and cultured in G1.1 and G2.2 to expanding blastocyst. For artificial shrinkage (AS) the micro injection pipette was inserted into blastocoele cavity and blastocoele fluid was aspirated. For assisted hatching (AH) PZD method was used. Control group was -AS/-AH and treatment groups were -AS/+AH, +AS/-AH and +AS/+AH. After AS and AH mouse blastocysts were equillibrated in G10 and G10E20 for 3 mins, respectively, and vitrified in G25E25 after loading on capped pulled-straw. Vitrified mouse blastocysts were thawed and cultured for 24 hrs. The survival and hatching rate was compared among one control and three treatment groups. RESULTS: The survival rates were 99%, 92% in +AS/+AH and +AS/-AH groups and 54%, 58% in -AS/-AH and -AS/+AH group, respectively. The survival rate was significantly higher in +AS group than in -AS group (p<0.01). Hatching rates were 34%, 96% in -AS/-AH and -AS/+AH groups and 41%, 100% in +AS/-AH and +AS/+AH, respectively. The hatching rates was higher in +AH group than in -AH group (p<0.01). After thawing recovery rates were 100%. Loading on capped pulled-straw, that is effective and useful method on vitrification. CONCLUSION: This study showed that artificial shrinkage of blastocoele cavity and assisted hatching (PZD) significantly improved the development of the vitrified mouse expanding blastocysts.
Key Words: Vitrification; Artificial shrinkage; Assisted hatching; Blastocoele cavity; Capped pulled-straw


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