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Relationships of Ca2+ Oscillations and ER Cluster Distribution to Porcine Oocyte Fragmentation |
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Da-Wei Tang,
Shen Liu,
Zhen-Xing Liu,
Yi Wu,
Xian-Long Wang,
Jing Zhang,
Zhong-Jian Bao,
Mao-Sheng Cui,
Ling Yang,
Yue Wu,
Shuan Zhao and Shen-Ming Zeng |
Abstract:
Ca2+ is an important intracellular messenger during oocyte development. Ca2+ oscillations are dependent upon the Endoplasmic Reticulum (ER), an internal Ca2+ store capable of releasing and re-sequestering Ca2+. However, mechanisms that regulate oocyte fragmentation are unclear. The aim of the current study was to investigate the mechanism of Ca2+ release and ER cluster distributions during fragmentation of aging culture porcine oocytes. After oocytes were cultured over a 40 h interval, ER cluster distributor and Ca2+ amplitudes significantly decreased. Oocyte fragmentation appeared after cells had been cultured 24 h and reached its peak at 48 h. At 40 h, normal morphology oocytes (NMor ) had low Ca2+ amplitude and little ER cluster distributor; partial fragmentation (PFra) oocytes had less frequent and shorter amplitudes of Ca2+ release with ER cluster distribution partly aggregated in cytoplasm; whereas complete fragmentation oocytes (Cfra), which were increased by low voltage EA or enucleation, had no Ca2+ amplitude or ER cluster distribution. The number of PFra oocytes that proceeded to CFra following aging was increased in a Ca2+ free medium. We therefore conclude that extracellular Ca2+ abnormality resulted in altered intracellular Ca2+, leading to changes in oocyte fragmentation dynamics.
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How to cite this article:
Da-Wei Tang, Shen Liu, Zhen-Xing Liu, Yi Wu, Xian-Long Wang, Jing Zhang, Zhong-Jian Bao, Mao-Sheng Cui, Ling Yang, Yue Wu, Shuan Zhao and Shen-Ming Zeng, 2011. Relationships of Ca2+ Oscillations and ER Cluster Distribution to Porcine Oocyte Fragmentation. Asian Journal of Animal and Veterinary Advances, 6: 322-332.
DOI: 10.3923/ajava.2011.322.332
URL: https://scialert.net/abstract/?doi=ajava.2011.322.332
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