Effects of dietary pectin on the profile and transport of intestinal bile acids in young pigs

文献类型： 外文期刊

第一作者： Fang, Wei

作者： Fang, Wei;Zhang, Li;Meng, Qingshi;Wu, Weida;Xie, Jingjing;Zhang, Hongfu;Lee, Yuan Kun

作者机构：

关键词： bile acid; cecum; farnesoid X receptor; ileum; transporter

期刊名称：JOURNAL OF ANIMAL SCIENCE （ 影响因子：3.159； 五年影响因子：2.912 ）

ISSN： 0021-8812

年卷期： 2018 年 96 卷 11 期

页码：

收录情况： SCI

摘要： Pectin has been known to lower circulating cholesterol by interacting with bile acid (BA) metabolism. The current study was aimed to investigate intestinal BA transport at the molecular level in a pig model. Twelve young pigs (11.05 0.11 kg) were randomly divided into 2 groups and fed corn soybean meal diets with either 5% pectin or cornstarch for 72 d. In pigs fed with pectin, total cholesterol and low-density lipoprotein cholesterol (LDL-C) were lowered but high-density lipoprotein (HDL-C) was increased (P < 0.05). Serum triglycerides tended to be lower in the pectin-fed animals (P = 0.093), whereas no change was noted in serum total bile acid. Along the length of the intestine, the size and composition of BA pools vary. The ratio of primary, secondary, taurine-conjugated, and glycine-conjugated BAs in the ileal pool was about 46:15:9:30, whereas it was 28:61:1:11 in the cecum and 22:65:3:9 in the colon (P < 0.05). In the feces, lithocholic acid and ursodeoxycholic acid ( UDCA) made up of over 97% of the total BA pool. Overall, the ileum had the greatest expression of farnesoid X receptor (FXR) and apical sodium-coupled bile acid transporter (ASBT) than the duodenum, jejunum, cecum, and colon (P < 0.05), whereas organic solute transporters a113 (OSTa/i3) gene expression was peaked in the ileum and jejunum (P < 0.05), Expression multidrug resistance protein 2 (MRP2) gradually decreased towards the end of the intestine (I' < 0.05). Greater expression of G protein-coupled bile acid receptor and multidrug resistance protein 3 (MRP3) was found in the cecum and colon (P < 0.05). In pigs fed with 5% pectin, only cecal UDCA (P = 0.097) and hyocholic acid (P = 0.088) showed a decreasing tendency. But FXR, ASBT, and MRP2 were upregulated in the ileum and FXR, OSTa/(1, MRP2, and MRP3 in the cecum of PEC-fed pigs (P < 0.05). Liver enzymes involved in BA biosynthesis (CYP7A1, CYP27A1, bile acid-CoA synthase, and bile acid-CoA:amino acid N acyltransferase) were not affected by pectin consumption. In conclusion, the abundant distribution of BA transporters and the greater BA pool size suggests the ileum as the major site for intestinal BA reabsorption in pigs. In the ileum, pectin increased in-and-out BA transport on the apical membrane by increasing ASBT and MRP2, but it increased the overall BA transport in the cecum by increasing OSTc(41 and MRP3.

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