文献类型： 外文期刊
第一作者： Fang, Wei
作者： Fang, Wei;Wen, Xiaobin;Meng, Qingshi;Wu, Weida;Xie, Jingjing;Zhang, Hongfu;Fang, Wei;Everaert, Nadia
作者机构：
关键词： Heat stress; Bile acids; Gene expression; Growing pigs
期刊名称：JOURNAL OF THERMAL BIOLOGY （ 影响因子：2.902； 五年影响因子：3.102 ）
ISSN： 0306-4565
年卷期： 2019 年 84 卷
页码：
收录情况： SCI
摘要： Bile acids (BAs) are critical for cholesterol homeostasis and new roles in metabolism and endocrinology have been demonstrated recently. It remains unknown whether BA metabolism can be affected by heat stress (HS). The objective of this study was to describe the shifts in serum, hepatic and intestinal BA profiles induced by chronic HS. Twenty-seven Large White pigs weighing 40.8 +/- 2.7 kg were assigned to one of the three treatments: a control group (CON, 23 degrees C), a HS group (33 degrees C), or a pair-fed group (PF, 23 degrees C and fed the same amount as HS group) for 21 d. The concentrations of taurine-conjugated BAs (TUDCA and THDCA in serum and TCDCA, TUDCA, THDCA and THCA in liver) were decreased in HS and PF pigs. However, in HS pigs, a reduction in taurine-conjugated BAs (TCBA) correlated with decreased liver genes expression of BA synthesis, conjugation and uptake transport. BA regulated-genes (FXR, TGR5 and FGFR4) in HS pigs and TGR5, FGFR4 and KL beta in PF pigs were down-regulated in liver. In ileum, total BAs and glycoursodeoxycholic acid concentrations were higher in HS pigs than other groups and PF group, respectively (P < 0.05). TCBA (P = 0.01) and tauroursodeoxycholic acid (P < 0.01) were decreased in PF group. BA transporters (OST alpha and MRP3) were up regulated in HS pigs compared with CON and PF pigs, respectively (P < 0.01). In cecum, ursodeoxycholic acid was higher in HS (P = 0.02) group than CON group. The expression of apical sodium-coupled bile acid transporter (P = 0.04) was lower in HS pigs than CON pigs, while OST beta (P < 0.01) was greater in HS group than PF group. These results suggest that chronic HS suppressed liver activity of synthesis and uptake of TCBA, at least in part, which was independent of reduced feed intake.
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