Cytoplasmic maturation for activation of pig follicular oocytes cultured and arrested at metaphase I

K. Kikuchi, T. Nagai, J. Ding, N. Yamauchi, J. Noguchi, Y. Izaike

研究成果: Contribution to journalArticle査読

33 被引用数 (Scopus)

抄録

A large population (62-90%) of pig follicular oocytes can mature to metaphase II after culture for 48 h. However, a proportion (6-22%) remain in an immature stage at metaphase I (metaphase I-arrested). The main objective of this study was to determine whether the cytoplasm of metaphase I-arrested pig oocytes is capable of being activated by sperm penetration or parthenogenetic stimulation. After culture for 48 h, oocytes without a polar body (73% were shown to be at metaphase I after staining) and those with a polar body (94% were at metaphase II) were fertilized in vitro. A total of 69% and 62% of the oocytes were activated to form a female pronucleus, respectively, and the rate of polar body extrusion induced by fertilization in the activated oocytes was 90% (the first polar body) and 95% (the second polar body), respectively. When oocytes without and with a polar body were stimulated with an electric pulse, 53% and 81% of the oocytes were activated, respectively. The rate of polar body extrusion in the activated oocytes was 73% (the first polar body) and 79% (the second polar body), respectively. In contrast, young metaphase I oocytes cultured for 24 h had low (6%) or zero activation rate after in vitro fertilization or electric pulse stimulation. However, about one-third of the young metaphase I oocytes penetrated by spermatozoa after in vitro fertilization responded to electric pulse 12 h after insemination, and almost all (93%) were activated when they were stimulated 24 h after insemination. Patterns of polypeptide synthesis and histone H1 kinase activity were similar in metaphase I-arrested and metaphase II oocytes, and were characterized by increase in a 25 kDa polypeptide and by decrease in kinase activity. Although the first step of meiotic division is impaired, these results indicate that metaphase I-arrested oocytes are mature cytoplasmically.

本文言語英語
ページ(範囲)143-156
ページ数14
ジャーナルJournal of Reproduction and Fertility
116
1
DOI
出版ステータス出版済み - 5 1999
外部発表はい

All Science Journal Classification (ASJC) codes

  • 生理学
  • 胎生学
  • 分子生物学
  • 産婦人科学
  • 発生生物学

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