Korean Journal of Veterinary Service (한국동물위생학회지)

The Korean Society of Veterinary Service (한국동물위생학회)
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Control of spermatozoa penetration and polyspermy by cumulus cells in porcine oocytes matured in culture

  • Published : 2003.12.01
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Abstract

The functional role of the cumulus cells on sperm penetration and polyspermy during in vitro fertilization was examined. The penetration rate was significantly higher(p<0.01) in oocytes with(61%) than without(25%) cumulus cells. No significant differences, however, was observed in polyspermy. When the hyaluronidase was supplemented to the fertilization medium with different concentrations, penetration rates in oocytes with cumulus cells were higher than oocytes without cumulus cells at 0(61 vs 34% ; p<0.05), 0.01(56 vs 35% ; p<0.05), 0.1(66 vs 30% ; p<0.05) and 1.0 mg/$m\ell$(39 vs 27%). On the other hand, the polyspermy rates were lower oocytes without than with cumulus cells, and had a tendency to decrease with high concentrations of hyaluronidase. In another experiment, the penetration and polyspermy rates had a tendency to increase as time of sperm-oocytes culture was prolonged. At 16 and 20hrs after insemination, the penetration rates were significantly higher(p<0.05) in oocytes with(48 and 62% for 16 and 20hrs) than without(25 and 31% for 16 and 20hrs) cumulus cells in medium with hyaluronidase. However, the polyspermy rates were significantly(p<0.05) lower in oocytes without(3 and 16%) than with(37 and 48%) cumulus cells at 16 and 20hrs after insemination. In cumulus-free oocytes inseminated in medium with or without hyaluronidase at different concentrations of cumulus cells, the penetration rates were significantly(p<0.05) higher in medium with than without hyaluronidase at different concentrations of cumulus cells. The proportions of polyspermy were lower in medium without than with hyaluronidase at 0 (10 vs 0%), 10$^2$(25 vs 0%), 10$^4$(24 vs 14%) and 10$\^$6/(29 vs 10% ; p<0.05) cumulus cells/ml. These results suggest the advantage of culture in medium with cumulus cells and denuded oocytes to inhibit polyspermy with no decrease in the penetration rates during the fertilization in vitro in the porcine.

Keywords

References

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