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Adenosine Receptors Mediated Intracellular Calcium in Cumulus Cells Involved in the Maintenance of First Meiotic Arrest

  • Hwang, Heekyung (Division of Development and Physiology, Department of Biology, Institute for Basic Sciences, Sungshin Women's University) ;
  • Cheon, Yong-Pil (Division of Development and Physiology, Department of Biology, Institute for Basic Sciences, Sungshin Women's University)
  • Received : 2013.05.29
  • Accepted : 2013.06.20
  • Published : 2013.06.30

Abstract

Keeping the intact germinal vesicle (GV) is essential for maintaining the capacity of mammals including human. It is maintained by very complex procedures along with folliculogenesis and is a critical step for getting competent oocyte. So far, a few mechanisms involved in folliculogenesis are known but GV arrest mechanisms are largely unrevealed. Cyclic AMP, a adenosine derived substance, have been used as inhibitor of germinal vesicle breakdown as a putative oocyte maturation inhibitor. In this study, we examined the potency of adenosine as GV maintainer and a possible signaling mediator for that. A1, A2b, and A3 were detected in cumulus cells of cumulus enclosed-oocyte (CEO). Intact of germinal vesicle was not kept like in follicle but the spontaneous maturation was inhibited by exogenous adenosine. It is inhibited with concentration dependent manners. Intracellular calcium level of cumulus was extensively increased after adenosine treatment. Based on these results it is suggested that one of the pathway for GV arrest by adenosine and its receptors is calcium mediated signaling pathway in CEO.

Keywords

References

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