Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effect of Co-Culture with Mammalian Spermatozoa on Maturation in vitro of Porcine Cumulus-Free Germinal Vesicle Oocytes

난구세포가 제거된 돼지 미성숙 난자의 체외성숙에 포유동물 정자가 미치는 영향

  • Published : 2003.10.01
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Abstract

The purpose of this study was to determine if the addition of spermatozoa into the culture medium could influence the nuclear maturation of denuded porcine germinal vesicle (GV) oocytes in vitro. Cumulus-oocyte complexes were collected from follicles of 3 to 5 mm in diameter, The cumulus and corona cells were removed from oocytes. Porcine denuded oocytes were cultured in tissue culture medium containing spermatozoa. After 48 h culture, oocytes were examined for the evidence of GV breakdown, metaphase I, anaphase-telophase I, and metaphase II (M II). The proportion of oocytes reaching M II stage was significantly (P<0.01) increased in the oocytes cultured in media containing spermatozoa compared to those in media without spermatozoa $(31.9\pm1.8%\; vs\; 14.9\pm1.0%)$.No differences in the rates of M II were observed among the different period of spermatozoa exposure nor among the spermatozoa from different species. The proportion of oocytes reaching M II stage was significantly different between high and low concentrations of spermatozoa. The present study suggests that mammalian spermatozoa contain a substance(s) that improves nuclear maturation in vitro of GV oocytes. Enhancing effect of spermatozoa for oocytes maturation in vitro is a highly dose-dependent.

본 연구는 난구세포가 제거된 돼지 미성숙 난자와 포유동물 정자의 공배양이 체외핵성숙에 미치는 영향을 조사하기 위하여 실시하였다. 난구세포가 부착된 미성숙난자를 직경 3-5 mm난포로부터 채취하여 난구세포를 제거한 후 정자가 첨가된 tissue culture medium 199에서 배양하였다. 배양 후 48시간에 난자의 핵성숙을 핵막붕괴, 제일차 감수분열 중기, 제일차 감수분열 후기-말기, 제이차감수분열 중기로 판정하였다. 배양 후 제이차감수분열 중기로 성숙한 난자의 비율이 무첨가구에 비하여 정자가 첨가된 배양액에서 성숙시킨 미성숙난자에서 유의적인(P<0.01) 증가가 있었다$(31.9\pm1.8%\; vs\; 14.9\pm1.0%)$. 난자의 성숙 단계에 따른 정자의 노출시간과 정자가 유래한 종에 따라서는 차이가 없었다. 그러나 정자의 첨가농도에 따라 유의적인 차이가 인정되었다. 본 연구는 포유동물의 정자는 미성숙난자의 체외성숙을 촉진하는 물질을 갖고 있으며, 촉진 효과는 농도에 의존하는 것으로 암시하고 있다.

Keywords

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