Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
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Effect of the Artificial Shrinkage on the Development of the Vitrified Bovine Embryos

  • Ha, A-Na (Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University) ;
  • Cho, Su-Jin (Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University) ;
  • Deb, Gautam-Kumar (Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University) ;
  • Bang, Jae-Il (Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University) ;
  • Kwon, Tae-Hyeon (Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University) ;
  • Choi, Byeong-Hyun (Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University) ;
  • Kong, Il-Keun (Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University)
  • Received : 2010.02.19
  • Accepted : 2010.03.02
  • Published : 2010.03.31
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Abstract

This study was conducted to find out the effects of artificial shrinkage (AS) on post-thaw development of bovine embryos. The blastocoelic cavity of blastocyst was punctured to remove its fluid contents and then incubated in the holding medium (HM) for 10 min. The punctured and non-punctured (control) blastocysts were equilibrated in vitrification solution 1 (VS1; TCM-199+20% FBS+10% EG) for 5 min and vitrification solution 2 (VS2; TCM199+20% FBS+35% EG+5% PVP+0.5 M Sucrose) for 1 min and vitrified by direct dropping into the liquid nitrogen. Vitrified blastocysts (punctured and control) were thawed and cultured in vitro (12 hr) for studying survival and hatching rates. The levels of shrinkage were measured by the volume of the blastocyst during equilibration in VS1 (at 1, 3 and 5 min of equilibration) and VS2 (at 30 and 60 sec of equilibration) that was considering the volume of non-punctured blastocyst in HM as 100%. The levels of shrinkage were higher in punctured group (62.4, 64.6, 64.3% at 1, 3 and 5 min in VS1; 50.6 and 52.7% at 30 and 60 sec in VS2) than control group (84.8, 86.6, 86.4% at 1, 3 and 5 min in VS1; 72.1 and 68.8% at 30 and 60 sec in VS2), but within each group the levels of shrinkage were similar. The survival (90.9%) and hatching (50.0%) rates of vitrified blastocysts at 12 hr post-thaw were higher in punctured group than that in control group (76.9% and 0.0% respectively). We confirmed that vitrification solutions (VS1 and VS2) have no toxic effect on the survival of blastocysts because the survival rates of blastocysts exposed to VS1 and VS2 for 24 hr were similar between punctured and control groups (94.3 vs. 96.0%; p>0.05). In conclusion, the preliminary data show that AS of blastocyst may improve survival and hatching rate after thawing.

Keywords

References

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