Nitric Oxide-induced Protein S-nitrosylation Causes Mitochondrial Dysfunction and Accelerates Post-ovulatory Aging of Oocytes in Cattle

• Published in: Journal of animal reproduction & biotechnology (Online) Vol. 35; no. 1; pp. 102 - 111
• Main Authors: Niu, Ying-Jie, Zhou, Dongjie, Zhou, Wenjun, Nie, Zheng-Wen, Kim, Ju-Yeon, Oh, YoungJin, Lee, So-Rim, Cui, Xiang-Shun
• Format: Journal Article
• Language: Korean
• Published: 2020
• Subjects: nitric oxide; mitochondria; S-nitrosylation; cattle; post-ovulatory aging
• ISSN: 2671-4639; 2671-4663

Nitric oxide (NO)-induced protein S-nitrosylation triggers mitochondrial dysfunction and was related to cell senescence. However, the exact mechanism of these damages is not clear. In the present study, to investigate the relationship between in vitro aging and NO-induced protein S-nitrosylation, oocytes were treated with sodium nitroprusside dihydrate (SNP), and the resultant S-nitrosylated proteins were detected through biotin-switch assay. The results showed that levels of protein S-nitroso thiols (SNO)s and expression of S-nitrosoglutathione reductase (GSNOR) increased, while activity and function of mitochondria were impaired during oocyte aging. Addition of SNP, a NO donor, to the oocyte culture led to accelerated oocyte aging, increased mitochondrial dysfunction and damage, apoptosis, ATP deficiency, and enhanced ROS production. These results suggested that the increased NO signal during oocyte aging in vitro, accelerated oocyte degradation due to increased protein S-nitrosylation, and ROS-related redox signaling.