Dynamic analysis of Ca2+ level during bovine oocytes maturation and early embryonic development

文献类型： 外文期刊

第一作者： Liang, Su Li

作者： Liang, Su Li;Zhao, Qian Jun;Li, Xiang Chen;Wang, Yi Peng;Su, Xiao Hua;Guan, Wei Jun;Ma, Yue Hui;Liang, Su Li;Jin, Ya Ping

作者机构：

关键词： bovine;concentration of Ca2+;distribution of Ca2+;embryos;oocytes

期刊名称：JOURNAL OF VETERINARY SCIENCE （ 影响因子：1.672； 五年影响因子：1.904 ）

ISSN： 1229-845X

年卷期： 2011 年 12 卷 2 期

页码：

收录情况： SCI

摘要： Mammalian oocyte maturation and early embryo development processes are Ca2+-dependent. In this study, we used confocal microscopy to investigate the distribution pattern of Ca2+ and its dynamic changes in the processes of bovine oocytes maturation, in vitro fertilization (IVF), parthenogenetic activation (PA) and somatic cell nuclear transfer (SCNT) embryo development. During the germinal vesicle (GV) and GV breakdown stage, Ca2+ was distributed in the cortical ooplasm and throughout the oocytes from the MI to MII stage. In IVF embryos, Ca2+ was distributed in the cortical ooplasm before the formation of the pronucleus. In 4-8 cell embryos and morulas, Ca2+ was present throughout the blastomere. In PA embryos, Ca2+ was distributed throughout the blastomere at 48 h, similar to in the 4-cell and 8-cell phase and the morula. At 6 h after activation, there was almost no distribution of Ca2+ in the SCNT embryos. However, Ca2+ was distributed in the donor nucleus at 10 h and it was distributed throughout the blastomere in the 2-8 cell embryos. In this study, Ca2+ showed significant fluctuations with regularity of IVF and SCNT groups, but PA did not. Systematic investigation of the Ca2+ location and distribution changes during oocyte maturation and early embryo development processes should facilitate a better understanding of the mechanisms involved in oocyte maturation, reconstructed embryo activation and development, ultimately improving the reconstructed embryo development rate.

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