Melatonin inhibits paraquat-induced cell death in bovine preimplantation embryos

文献类型： 外文期刊

第一作者： Pang, Yun-Wei

作者： Pang, Yun-Wei;Sun, Ye-Qing;Sun, Wei-Jun;Du, Wei-Hua;Hao, Hai-Sheng;Zhao, Shan-Jiang;Zhu, Hua-Bin

作者机构：

关键词： apoptosis;embryo;melatonin;oxidative damage;paraquat

期刊名称：JOURNAL OF PINEAL RESEARCH （ 影响因子：13.007； 五年影响因子：12.936 ）

ISSN： 0742-3098

年卷期： 2016 年 60 卷 2 期

页码：

收录情况： SCI

摘要： Preimplantation embryos are sensitive to oxidative stress-induced damage that can be caused by reactive oxygen species (ROS) originating from normal embryonic metabolism and/or the external surroundings. Paraquat (PQ), a commonly used pesticide and potent ROS generator, can induce embryotoxicity. The present study aimed to investigate the effects of melatonin on PQ-induced damage during embryonic development in bovine preimplantation embryos. PQ treatment significantly reduced the ability of bovine embryos to develop to the blastocyst stage, and the addition of melatonin markedly reversed the developmental failure caused by PQ (20.9% versus 14.3%). Apoptotic assay showed that melatonin pretreatment did not change the total cell number in blastocysts, but the incidence of apoptotic nuclei and the release of cytochrome c were significantly decreased. Using real-time quantitative polymerase chain reaction analysis, we found that melatonin pre-incubation significantly altered the expression levels of genes associated with redox signaling, particularly by attenuating the transcript level of Txnip and reinforcing the expression of Trx. Furthermore, melatonin pretreatment significantly reduced the expression of the pro-apoptotic caspase-3 and Bax, while the expression of the anti-apoptotic Bcl-2 and XIAP was unaffected. Western blot analysis showed that melatonin protected bovine embryos from PQ-induced damage in a p38-dependent manner, but extracellular signal-regulated kinase (ERK) and c-JUN N-terminal kinase (JNK) did not appear to be involved. Together, these results identify an underlying mechanism by which melatonin enhances the developmental potential of bovine preimplantation embryos under oxidative stress conditions.

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