Proteomic changes of the porcine small intestine in response to chronic heat stress

文献类型： 外文期刊

第一作者： Cui, Yanjun

作者： Cui, Yanjun;Gu, Xianhong

作者机构：

关键词： heat stress;intestine function;morphology;proteomic;pig (Sus scrofa)

期刊名称：JOURNAL OF MOLECULAR ENDOCRINOLOGY （ 影响因子：5.098； 五年影响因子：4.755 ）

ISSN： 0952-5041

年卷期： 2015 年 55 卷 3 期

页码：

收录情况： SCI

摘要： Acute heat stress (HS) negatively affects intestinal integrity and barrier function. In contrast, chronic mild HS poses a distinct challenge to animals. Therefore, this study integrates biochemical, histological and proteomic approaches to investigate the effects of chronic HS on the intestine in finishing pigs. Castrated male crossbreeds (79.00 +/- 1.50 kg BW) were subjected to either thermal neutral (TN, 21 degrees C; 55% +/- 5% humidity; n=8) or HS conditions (30 degrees C; 55% +/- 5% humidity; n=8) for 3 weeks. The pigs were sacrificed after 3 weeks of high environmental exposure and the plasma hormones, the intestinal morphology, integrity, and protein profiles of the jejunum mucosa were determined. Chronic HS reduced the free triiodothyronine (FT3) and GH levels. HS damaged intestinal morphology, increased plasma D-lactate concentrations and decreased alkaline phosphatase activity of intestinal mucosa. Proteome analysis of the jejunum mucosa was conducted by 2D gel electrophoresis and mass spectrometry. Fifty-three intestinal proteins were found to be differentially abundant, 18 of which were related to cell structure and motility, and their changes in abundance could comprise intestinal integrity and function. The down-regulation of proteins involved in tricarboxylic acid cycle (TCA cycle), electron transport chain (ETC), and oxidative phosphorylation suggested that chronic HS impaired energy metabolism and thus induced oxidative stress. Moreover, the changes of ten proteins in abundance related to stress response and defense indicated pigs mediated long-term heat exposure and counteracted its negative effects of heat exposure. These findings have important implications for understanding the effect of chronic HS on intestines.

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