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Effects of Fructose in a Chemically Defined Maturation Medium on Oocyte Maturation and Parthenogenetic Embryo Development in Pigs

돼지 난자의 체외성숙에서 합성배양액에 첨가된 과당이 난자의 성숙 및 단위발생 배아의 체외발육에 미치는 영향

  • Shin, Hyeji (College of Veterinary Medicine, Kangwon National University) ;
  • Kim, Minji (Division of Applied Animal Science, College of Animal Life Science, Kangwon National University) ;
  • Lee, Joohyeong (Institute of Veterinary Science, Kangwon National University) ;
  • Lee, Seung Tae (Division of Applied Animal Science, College of Animal Life Science, Kangwon National University) ;
  • Park, Choon-Keun (Division of Applied Animal Science, College of Animal Life Science, Kangwon National University) ;
  • Hyun, Sang-Hwan (Laboratory of Veterinary Embryology and Biotechnology (VETEMBIO), College of Veterinary Medicine, Chungbuk National University) ;
  • Lee, Eunsong (College of Veterinary Medicine, Kangwon National University)
  • 신혜지 (강원대학교 수의과대학) ;
  • 김민지 (강원대학교 동물생명과학대학) ;
  • 이주형 (강원대학교 동물의학종합연구소) ;
  • 이승태 (강원대학교 동물생명과학대학) ;
  • 박춘근 (강원대학교 동물생명과학대학) ;
  • 현상환 (충북대학교 수의과대학) ;
  • 이은송 (강원대학교 수의과대학)
  • Received : 2017.09.20
  • Accepted : 2017.09.26
  • Published : 2017.09.30

Abstract

The objective of this study was to determine the effect of fructose that was supplemented to a chemically defined in vitro maturation (IVM) medium on oocyte maturation and embryonic development after parthenogenesis in pigs. The base medium for in vitro maturation (IVM) was porcine zygote medium (PZM) that was supplemented with 0.05% (w/v) polyvinyl alcohol (PVA) or 10% (v/v) porcine follicular fluid (pFF). In the first experiment, when immature pig oocytes were matured in a chemically defined medium that was supplemented with 5.5 mM glucose or with 1.5, 3.0 and 5.5 mM fructose, 3.0 mM fructose resulted in a higher nuclear maturation (91.5%) than 1.5 and 5.5 mM fructose (81.9 and 81.9%, respectively) but showed a similar result with 5.5 mM glucose (94.2%). However, there was no significant differences among groups in the embryo cleavage (89.4-92.4%), blastocyst formation (37.5-41.1%), and mean cell number of blastocyst (30.8-34.2 cells). Fructose at the concentration of 3.0 mM (1.08 pixels/oocyte) resulted in a higher intra-oocyte glutathione (GSH) content than 1.5 and 5.5 mM fructose (1.00 and 0.87 pixels/oocytes, respectively) while the cumulus cell expansion was not influenced. In the second experiment, effect of individual and combined supplementation of a chemically defined maturation medium with 5.5 mM glucose or 3.0 mM fructose was examined. No significant effect was found in the nuclear maturation (86.3-92.6%). Embryo cleavage was significantly increased by the combined supplementation with glucose and fructose (95.2%) compared to that with 3.0 mM fructose only (85.7%) while blastocyst formation (37.3-42.8%) and embryonic cell number (33.3-34.1 cells) were not altered. Effect of supplementation of pFF-containing medium with glucose and fructose + glucose was examined in the third experiment. No significant effect by the supplementation with glucose and fructose or glucose alone was observed in the nuclear maturation of oocytes (90.7-94.1%) and blastocyst formation (51.0-56.5%). Our results demonstrate that 3.0 mM fructose was comparable to 5.5 mM glucose in supporting in vitro oocyte maturation and embryonic development after parthenogenesis and could be used as an alternative energy source to glucose for in vitro maturation of pig oocytes.

Keywords

References

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