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Vertebrate reproductive science and technology
RESEARCH ARTICLE

Abnormal changes in mitochondria, lipid droplets, ATP and glutathione content, and Ca2+ release after electro-activation contribute to poor developmental competence of porcine oocyte during in vitro ageing

Ze-Dong Hao A B , Shen Liu A B , Yi Wu A B , Peng-Cheng Wan A , Mao-Sheng Cui A , Heng Chen A and Shen-Ming Zeng A C
+ Author Affiliations
- Author Affiliations

A Laboratory of Animal Embryonic Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R. China.

B These authors contributed equally to this work.

C Corresponding author. Email: zengsm@cau.edu.cn

Reproduction, Fertility and Development 21(2) 323-332 https://doi.org/10.1071/RD08157
Submitted: 21 July 2008  Accepted: 8 September 2008   Published: 27 January 2009

Abstract

The present study aims to investigate major changes in porcine oocytes during ageing in vitro. After the oocytes were cultured for 44, 56, 68 and 80 h, changes to porcine oocytes in ultrastructure, mitochondrial distribution, glutathione (GSH) and ATP content, Ca2+ release patterns and developmental competence after electro-activation were observed. Mitochondria were evenly distributed in oocytes at 44 h, aggregated in clusters or in peripheral cytoplasm at 68 h and dimly dispersed throughout ooplasm at 80 h. Mitochondrial shape during ageing was also observed by transmission electron microscopy (TEM) at the same time intervals. Most mitochondria were spherical at 44 h, and became elongated when the culture time was extended to 68 h and 80 h. Moreover, mitochondrial clustering became increasingly loose from 56 h. Lipid droplets in oocytes appeared prominent and electron-dense at 44 h, but electron density was lost at 56 h. Lipid droplets were solidified as of 68 h. There was an age-dependent decrease in ATP content per oocyte. Glutathione content per oocyte decreased significantly and remained lower after 56 h. Amplitudes of [Ca2+] rise decreased dramatically following 56 h, and the time required for [Ca2+] to plateau became shorter after electro-activation with prolonged culture time. Cleavage and blastocyst rates of aged oocytes progressively decreased, while the fragmentation rate gradually increased after electro-activation. It is concluded that abnormal changes in mitochondria, lipid droplets, Ca2+ release after electro-activation, and ATP and GSH content in oocytes during ageing may result in poor developmental competence of parthenotes.


Acknowledgements

This research was supported by the Natural Science Foundation of China (No. 30571333) and by the Beijing Natural Science Foundation (5072026). We greatly thank Dr Cheng-ming Wang and David A. Dunn, Department of Pathobiology, College of Veterinary Medicine, Auburn University, USA for their critical reviews of this manuscript.


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