Effects of epigallocatechin-3-gallate on bovine oocytes matured in vitro

文献类型： 外文期刊

第一作者： Huang, Ziqiang

作者： Huang, Ziqiang;Pang, Yunwei;Hao, Haisheng;Du, Weihua;Zhao, Xueming;Zhu, Huabin

作者机构：

关键词： Epigallocatechin-3-gallate; Reactive Oxygen Species (ROS); Oocytes; Oxidative Stress; Antioxidant; Bovine

期刊名称：ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES （ 影响因子：2.509； 五年影响因子：2.604 ）

ISSN： 1011-2367

年卷期： 2018 年 31 卷 9 期

页码：

收录情况： SCI

摘要： Objective: Epigallocatechin-3-gallate (EGCG) is a major ingredient of catechin polyphenols and is considered one of the most promising bioactive compounds in green tea because of its strong antioxidant properties. However, the protective role of EGCG in bovine oocyte in vitro maturation (IVM) has not been investigated. Therefore, we aimed to study the effects of EGCG on IVM of bovine oocytes. Methods: Bovine oocytes were treated with different concentrations of EGCG (0, 25, 50, 100, and 200 mu M), and the nuclear and cytoplasmic maturation, cumulus cell expansion, intracellular reactive oxygen species (ROS) levels, total antioxidant capacity, the early apoptosis and the developmental competence of in vitro fertilized embryos were measured. The mRNA abundances of antioxidant genes (nuclear factor erythriod-2 related factor 2 [NRF2], superoxide dismutase 1 [SOD1], catalase [CAT], and glutathione peroxidase 4 [GPX4]) in matured bovine oocytes were also quantified. Results: Nuclear maturation which is characterized by first polar body extrusion, and cytoplasmic maturation characterized by peripheral and cortical distribution of cortical granules and homogeneous mitochondrial distribution were significantly improved in the 50 mu M EGCG-treated group compared with the control group. Adding 50 mu M EGCG to the maturation medium significantly increased the cumulus cell expansion index and up-regulated the mRNA levels of cumulus cell expansion-related genes (hyaluronan synthase 2, tumor necrosis factor alpha induced protein 6, pentraxin 3, and prostaglandin 2). Both the intracellular ROS level and the early apoptotic rate of matured oocytes were significantly decreased in the 50 mu M EGCG group, and the total antioxidant ability was markedly enhanced. Additionally, both the cleavage and blastocyst rates were significantly higher in the 50 mu M EGCG-treated oocytes after in vitro fertilization than in the control oocytes. The mRNA abundance of NRF2, SOD1, CAT, and GPX4 were significantly increased in the 50 mu M EGCG-treated oocytes. Conclusion: In conclusion, 50 mu M EGCG can improve the bovine oocyte maturation, and the protective role of EGCG may be correlated with its antioxidative property.

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