Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
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Effect of Superoxide Dismutase and Cryoprotectants on Viability of Frozen-thawed Porcine Oocytes by Vitrification Method

Vitrification법에 의한 돼지 난자의 동결-응해 후 생존능력에 있어서 동해보호제와 Superoxide Dismutase의 영향

  • 김미성 (강원대학교 동물자원과학대학) ;
  • 김세웅 (강원대학교 동물자원과학대학) ;
  • 정희태 (강원대학교 동물자원과학대학) ;
  • 이상영 (경상남도 첨단양돈 생명공학과) ;
  • 양부근 (강원대학교 동물자원과학대학) ;
  • 김정익 (강원대학교 동물자원과학대학) ;
  • 박춘근 (강원대학교 동물자원과학대학)
  • Published : 2002.12.01
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Abstract

This study was performed to investigate the effect of different cryoprotectants and superoxide dismutase(SOD) on viability of frozen-thawed oocytes by vitrification method in the pig. The proportions of oocytes matured to metaphase-I stage were higher in medium with ethylene glycol and DMSO(19.9%) than in medium with glycerol and DMSO(6.5%). When the oocytes were exposed in medium containing ethylene glycol, oocyte matured to prophase-I were not observed. On the other hand. significant differences were not observed between in medium with and without SOD( 1 unit/$m\ell$) during IVM of vitrified and thawed immature oocytes. However, the maturation rate from metaphase-I to metaphase-II were higher in medium with that than without SOD. The penetration rates after IVF of oocytes frozen-thawed were also higher in medium with that than without SOD. These results indicate that frozen-thawed oocytes treated with ethylene glycol and DMSO was more protective against freezing effect and that addition of 1 unit/$m\ell$ SOD in medium fur prevent of lipid peroxidation may play a positive role in improving of viability of frozen-thawed oocytes.

본 연구에서는 vitrification방법을 사용하여 돼지 미수정란의 동결-융해시 난자생존능력에 대한특정 동해방지제 사용과 superoxide dismutase(SOD) 첨가의 영향을 검토하고자 수행하였다. 그 결과 미성숙 난자를 ethylene glycol과 DMSO 노출 후 성숙율(M-I에서 19.9%)이 glycerol과 DMSO 노출 후 성숙율(M-I에서 6.5%)보다 더 높았으며 ethylene glycol에 노출 후에는 M-I기로 성숙발달한 난자는 관찰되지 않았다. 한편. 미성숙 난자의 동결-융해 후 성숙배양시 SOD l unit/$m\ell$의 첨가시 (3.0%) 무첨가시(3.0%)와 성숙율이 같았으나 M-I에서 M-II 단계까지의 성숙율은 l unit/$m\ell$ 첨가 (65.0%)가 무첨가(54.0%)보다 높은 경향을 보였다. 또한, 성숙난자의 동결-융해 후 수정 시 정자 침입율은 lunit/$m\ell$ SOD 첨가(6.0%)의 경우 무첨가시 (3.7%)보다 더 높게 나타났다. 본 연구의 결과로부터 vitrifiration 방법을 이용 한 돼지 미수정란의 동결- 융해시 ethylenc glycol과 DMSO를 동해방지제로 사용하는 것이 효과적이며, 지질산화를 방지하기 위해 배양액에 l unit/$m\ell$의 SOD를 첨가하는 것이 동결-융해된 미수정란의 생존능력을 향상시키는 것으로 생각된다.

Keywords

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