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Dihydromyricetin attenuates heat stress-induced apoptosis in dairy cow mammary epithelial cells through suppressing mitochondrial dysfunction

文献类型： 外文期刊

作者： Wang, Hui-Li 1 ; Xing, Guang-Dong 1 ; Qian, Yong 1 ; Sun, Xue-Feng 1 ; Zhong, Ji-Feng 1 ; Chen, Kun-Lin 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Jiangsu Key Lab Food Qual & Safety State Key Lab, Minist Sci & Technol, Nanjing 210014, Peoples R China

2.Jiangsu Acad Agr Sci, Key Lab Crop & Anim Integrated Farming, Minist Agr, Nanjing 210014, Peoples R China

关键词： Dihydromyricetin; Heat stress; Mitochondrial fission and fusion; Apoptosis; Dairy cow mammary epithelial cells

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：4.872； 五年影响因子：4.966 ）

ISSN： 0147-6513

年卷期： 2021 年 214 卷

页码：

收录情况： SCI

摘要： It is well known that the dairy cow production is very sensitive to environmental factors, including high temperature, high humidity and radiant heat sources. High temperature-induced heat stress is the main environmental factor that causes oxidative stress and apoptosis, which affects the development of mammary glands in dairy cows. Dihydromyricetin (DMY) is a nature flavonoid compound extracted from Ampelopsis grossedentata; it has been shown to have various pharmacological functions, such as anti-inflammation, antitumor and liver protection. The present study aims to evaluate the protective effect of DMY on heat stress-induced dairy cow mammary epithelial cells (DCMECs) apoptosis and explore the potential mechanisms. The results show that heat stress triggers heat shock response and reduces cell viability in DCMECs; pretreatment of DCMECs with DMY (25 ?M) for 12 h significantly alleviates the negative effects of heat stress on cells. DMY can provide cytoprotective effects by suppressing heat stress-caused mitochondrial membrane depolarization and mitochondrial dysfunction, Bax and Caspase 3 activity, and modulation of oxidative enzymes, thereby preventing ROS production and apoptosis in DCMECs. Importantly, DMY treatment could attenuate heat stress-induced mitochondrial fragmentation through mediating the expression of mitochondrial fission and fusion-related genes, including Dynamin related protein 1 (Drp1), Mitochondrial fission 1 protein (Fis1), and Mitofusin1, 2 (Mfn1, 2). Above all, our findings demonstrate that DMY could protect DCMECs against heat stress-induced injury through preventing oxidative stress, the imbalance of mitochondrial fission and fusion, which provides useful evidence that DMY can be a promising therapeutic drug for protecting heat stress-induced mammary glands injury and mastitis.

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