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Growth of Ovarian Primary Follicles Retrieved from Neonates of Different Ages and Derivation of Mature Oocytes Following In vitro-Culture

  • Choi, J.H. (Department of Agricultural Biotechnology, Seoul National University) ;
  • Yoo, C.R. (Department of Agricultural Biotechnology, Seoul National University) ;
  • Ahn, J.Y. (WCU Biomodulation Program, Seoul National University) ;
  • Park, J.H. (Department of Agricultural Biotechnology, Seoul National University) ;
  • Lim, J.M. (Department of Agricultural Biotechnology, Seoul National University)
  • Received : 2010.07.06
  • Accepted : 2010.12.31
  • Published : 2012.05.01

Abstract

This study was conducted to improve the yield of mature oocytes from in vitro-culture of ovarian primary follicles by optimizing follicle retrieval from neonatal mice of different ages. Primary follicles of 75 to $99{\mu}m$ in diameter were collected daily from 7- to 14-day-old neonatal mice, and subsequently cultured in ${\alpha}$-MEM medium. Number of primary follicles isolated, growth of the follicle during in vitro-culture and maturation of intrafollicular oocytes were monitored. Overall, mean number of preantral follicles per animal was improved from 10.7 to 88.7 as the age of follicle donors was increased from 7 to 14-day-old. Number of primary follicles was increased gradually up to 11-day-old (35.7 follicle per an animal), then reduced to 29 in 14-day-old (p = 0.0013). More follicles retrieved from 10-day-old or 11-day-old females maintained their morphological normality at the end of primary culture than the follicles retrieved from 9-day-old. Of those cultured, primary follicles retrieved from 11-day-old mice yielded largest larger number of early secondary follicles than the follicles retrieved from in the other ages (39 vs. 13 to 29%). More than 3.3-times increase (0.86 to 2.86; p<0.05) in an average number of mature oocytes per animal was observed in the group of 11-day-old, compared with 9-day-old. However, no difference was found in the percentage of primary follicles developing into the pseudoantral stage (21 to 30%; p = 0.5222) and in the percentage of oocytes mucified (32 to 39%; p = 0.5792). In conclusion, a positive correlation between retrieval time and follicle growth was detected, which influences the efficiency to derive mature oocytes by follicle culture.

Keywords

References

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Cited by

  1. In vitro ovarian follicle growth: a comprehensive analysis of key protocol variables† vol.103, pp.3, 2012, https://doi.org/10.1093/biolre/ioaa073