分子营养 Molecular Nutrition

丁酸梭菌对2种遗传背景仔猪肠道屏障功能的影响及其分子机制

  • 李海花 ,
  • 李玉鹏 ,
  • 王柳懿 ,
  • 王文杰 ,
  • 乔家运
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  • 1. 天津农学院动物科学与动物医学学院, 天津 300384;
    2. 天津市畜牧兽医研究所, 天津 300381;
    3. 天津师范大学生命科学学院, 天津 300387
李海花(1981-),女,河南周口人,副研究员,博士,研究方向为动物营养与免疫。E-mail:lihaihuaok@126.com

收稿日期: 2019-03-05

  网络出版日期: 2019-10-17

基金资助

国家自然科学基金项目(31702147);天津市农业科学院青年科研人员创新研究与实验项目(编号:2018008);天津市""131"创新型人才团队(20180338)

Effects of Clostridium butyricum on Intestinal Barrier Function of Piglets with Two Genetic Backgrounds and Its Molecular Mechanism

  • LI Haihua ,
  • LI Yupeng ,
  • WANG Liuyi ,
  • WANG Wenjie ,
  • QIAO Jiayun
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  • 1. College of Animal Science and Animal Medicine, Tianjin Agricultural University, Tianjin 300384, China;
    2. Tianjin Institute of Animal Husbandry and Veterinary, Tianjin 300381, China;
    3. Tianjin Normal University, Tianjin 300387, China

Received date: 2019-03-05

  Online published: 2019-10-17

摘要

本试验旨在研究丁酸梭菌对2种遗传背景断奶仔猪健康状况、肠道发育、肠道屏障功能、血清细胞因子含量和黏膜免疫关键蛋白表达的影响。试验采用2×2因子设计,选择(21±2)日龄、体重相近的"东北民猪×巴克夏"二元杂交黑猪12头,随机分成2个组(对照组和试验组);另选择(21±2)日龄、体重相近的"杜×长×大"三元杂交白猪12头,随机分成2个组(对照组和试验组);每个组均6个重复,单栏饲养。对照组均饲喂基础饲粮,试验组均饲喂基础饲粮+5×1011 CFU/kg丁酸梭菌制剂。试验预试期3 d,正试期14 d。结果表明:1)与相应的对照组相比,2个试验组仔猪血小板数目均显著增加(P<0.05),空肠和回肠的绒毛高度/隐窝深度均显著提高(P<0.05),血清中D-乳酸含量均显著降低(P<0.05);二元杂交试验组仔猪空肠封闭蛋白1(claudin-1)和回肠claudin-1、紧密连接蛋白1(ZO-1)、闭合蛋白(occludin)mRNA相对表达水平均显著提高(P<0.05),三元杂交试验组仔猪空肠ZO-1和occludin mRNA相对表达水平均显著提高(P<0.05);二元杂交试验组仔猪空肠黏膜中Toll样受体2(TLR2)、Toll样受体4(TLR4)、髓样分化因子88(MyD88)和回肠黏膜中TLR2、TLR4、B细胞淋巴瘤蛋白3(Bcl3)mRNA相对表达水平均显著提高(P<0.05),三元杂交试验组仔猪空肠黏膜中TLR2和回肠黏膜中TLR2、TLR4、MyD88、Toll作用蛋白(Tollip)、Bcl3 mRNA相对表达水平均显著提高(P<0.05)。2)二元杂交试验组仔猪空肠claudin-1、TLR4和MyD88和回肠claudin-1、ZO-1、occludin mRNA相对表达水平显著高于三元杂交试验组仔猪(P<0.05),但是二元杂交试验组仔猪回肠黏膜中TLR2、TLR4、TollipBcl3 mRNA相对表达水平显著低于三元杂交试验组仔猪(P<0.05)。综上所述,丁酸梭菌能够促进仔猪肠道发育,激活2种遗传背景仔猪肠黏膜TLR2/4信号通路,并促进其通路关键负反馈子的表达,提高紧密连接蛋白的表达,降低肠黏膜通透性,提高肠道屏障功能,并且对2种遗传背景仔猪肠道屏障功能的调节存在差异。

本文引用格式

李海花 , 李玉鹏 , 王柳懿 , 王文杰 , 乔家运 . 丁酸梭菌对2种遗传背景仔猪肠道屏障功能的影响及其分子机制[J]. 动物营养学报, 2019 , 31(10) : 4647 -4658 . DOI: 10.3969/j.issn.1006-267x.2019.10.029

Abstract

This study was aimed to investigate the effects of Clostridium butyricum on the health status, intestinal development, intestinal barrier function, serum cytokine contents and mucosal immunity key protein expression of weaned piglets with two genetic backgrounds. A 2×2 factors design was used in this experiment, 12 "Northeastern indigenous×Berkshire" black piglets with similar body weight and (21±2) days of age were selected and divided into 2 groups (control group and experimental group), randomly, and 12 "Duroc×Landrace×Yorkshire" white piglets with similar body weight and (21±2) days of age were selected and divided into 2 groups (control group and experimental group), randomly. Each group was divided into 6 replicates and each pig was fed in single column. Weaned piglets in control groups were fed basal diets, and those in experimental groups were fed the basal diets supplemented with 5×1011 CFU/kg Clostridium butyricum preparation for 14 days after 3 days adaption. The results showed as follows:1) compared with the each control group, the platelet counts of piglets in the two experimental groups were both increased significantly (P<0.05), the villus length to crypt depth ratios in both jejunum and ileum of the two kinds of piglets were increased significantly (P<0.05), the serum D-lactic contents of the two kinds of weaned piglets were decreased significantly (P<0.05), the claudin-1 mRNA relative expression level in jejunum, and the mRNA relative expression levels of claudin-1, zonula occludens-1 (ZO-1) and occludin in ileum of piglets in binary hybridization experimental group were all increased significantly (P<0.05), the mRNA relative expression levels of ZO-1 and occludin in jejnum of piglets in ternary hybridization experimental group were both increased significantly (P<0.05), the mRNA relative expression levels of Toll-like receptor 2 (TLR2), Toll-like receptor 4 (TLR4) and myeloid differentiation factor 88 (MyD88) in jejunum mucosa and TLR2, TLR4 and B-cell lymphoma 3 protein (Bcl3) in ileum mucosa of piglets in binary hybridization experimental group were increased significantly (P<0.05), and the mRNA relative expression levels of TLR2 in jejunum mucosa and TLR2, TLR4, MyD88, Toll-interacting protein (Tollip) and Bcl3 in ileum mucosa of piglets in ternary hybridization experimental group were increased significantly (P<0.05). 2) Compared with the ternary hybridization experimental group, the mRNA relative expression levels of claudin-1, TLR4 and MyD88 in jejunum and claudin-1, ZO-1 and occludin in ileum of piglets in binary hybridization experimental group were increased significantly (P<0.05), but the mRNA relative expression levels of TLR2, TLR4, Tollip and Bcl3 in ileum mucosa of piglets in binary across experimental group were decreased significantly (P<0.05). In conclusion, Clostridium butyricum can improve intestinal development of piglets, activate TLR2/4 signaling pathway in intestinal mucosa of two genetic background piglets, promote the expression of key negative feedback factors in the pathway, increase the expression of tight junction proteins, decrease the intestinal mucosal permeability, improve intestinal barrier function, and there are certain differences in the regulation of intestinal barrier function of the two genetic background weaned piglets.

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