Overgrazing induces alterations in the hepatic proteome of sheep (Ovis aries): an iTRAQ-based quantitative proteomic analysis

文献类型： 外文期刊

第一作者： Ren, Weibo

作者： Ren, Weibo;Hou, Xiangyang;Wang, Yuqing;Li, Xiliang;Ding, Yong;Wu, Zinian;Hu, Ningning;Kong, Lingqi;Chang, Chun;Jiang, Chao;Zhang, Jize;Badgery, Warwick;Guo, Huiqin

作者机构：

关键词： Overgrazing;Liver;proteomics;Sheep

期刊名称：PROTEOME SCIENCE （ 影响因子：2.48； 五年影响因子：2.619 ）

ISSN： 1477-5956

年卷期： 2017 年 15 卷

页码：

收录情况： SCI

摘要： Background: The degradation of the steppe of Inner Mongolia, due to overgrazing, has resulted in ecosystem damage as well as extensive reductions in sheep production. The growth performance of sheep is greatly reduced because of overgrazing, which triggers massive economic losses every year. The liver is an essential organ that has very important roles in multiple functions, such as nutrient metabolism, immunity and others, which are closely related to animal growth. However, to our knowledge, no detailed studies have evaluated hepatic metabolism adaption in sheep due to overgrazing. The molecular mechanisms that underlie these effects remain unclear. Methods: In the present study, our group applied isobaric tags for relative and absolute quantitation (iTRAQ)-based quantitative proteomic analysis to investigate changes in the protein profiles of sheep hepatic tissues when nutrition was reduced due to overgrazing (12.0 sheep/ha), with the goal of characterizing the molecular mechanisms of hepatic metabolism adaption in sheep in an overgrazing condition. Results: The body weight daily gain of sheep was greatly decreased due to overgrazing. Overall, 41 proteins were found to be differentially abundant in the hepatic tissue between a light grazing group and an overgrazing group. Most of the differentially expressed proteins identified are involved in protein metabolism, transcriptional and translational regulation, and immune response. In particular, the altered abundance of kynureninase (KYNU) and HAL (histidine ammonia-lyase) involved in protein metabolic function, integrated with the changes of serum levels of blood urea nitrogen (BUN) and glucose (GLU), suggest that overgrazing triggers a shift in energy resources from carbohydrates to proteins, causing poorer nitrogen utilization efficiency. Altogether, these results suggest that the reductions in animal growth induced by overgrazing are associated with liver proteomic changes, especially the proteins involved in nitrogen compounds metabolism and immunity. Conclusions: This provides new information that can be used for nutritional supplementation to improve the growth performance of sheep in an overgrazing condition.

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