Developmental Changes of Expression of Tight Junction Protein Genes in Broiler Intestine

  • WEN Xueting ,
  • XIAO Yingping ,
  • LYU Wentao ,
  • LIU Xiuting ,
  • YANG Caimei ,
  • WANG Yongxia ,
  • YANG Hua
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  • 1. College of Animal Science & Technology, Zhejiang A&F University, Hangzhou 311300, China;
    2. State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Hangzhou 310021, China;
    3. Institute of Quality and Standard for Agro-Products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China

Received date: 2020-07-07

  Online published: 2020-10-22

Abstract

This experiment was conducted to investigate the developmental changes of expression of tight junction protein genes in different intestinal segments of broilers. The duodenal, jejunal, ileal, cecal and colonic tissue segments and mucous membrane were collected from 6 out of 60 fresh-hatched Ross 308 broilers at 1, 3, 7, 14 and 28 days of age, respectively. The relative expression levels of tight junction protein genes including Claudin-1, Claudin-2, Occludin, zonula occluden (ZO)-1 and ZO-2 genes in each intestinal segment were detected by real-time fluorescent quantitative (RT-qPCR) technique. The results were as follows: 1) at 1 day of age, the relative expression levels of Claudin-1 gene in the duodenum, jejunum, ileum and cecum were significantly higher than that at other days of age (P<0.05) whereas the relative expression level of Claudin-2 gene in all intestinal segment was the lowest (P<0.05). The relative expression level of Claudin-2 in the cecum and colon was increased with age increasing and reached the highest level at 7 days of age. The relative expression level of Claudin-2 gene decreased from duodenum to colon. 2) The relative expression level of Occludin gene in the duodenum, jejunum, ileum and colon at 1 day of age was significantly lower than that at other days of age (P<0.05), while it in the duodenum, jejunum and ileum was increased with age increasing, and reached a peak at 14 days of age. 3) The relative expression level of ZO-1 gene in all intestinal segments at 1 day of age was significantly lower than that at other days of age (P<0.05). The relative expression level of ZO-2 gene in the duodenum and jejunum was not significantly different with age increasing (P>0.05), while it in the ileum was increased with age increasing, reached a peak at 14 days of age and then decreased. 4) Both age and intestinal segment had significant effects on the relative expression levels of tight junction protein genes (P<0.05), and the interaction effects of age and intestinal segment on the relative expression levels of tight junction protein genes were also significant (P<0.01). In conclusion, the relative expression level of Claudin-1 gene is the highest at 1 day of age, whereas Claudin-2, Occludin and ZO-1 genes are the opposite. The intestinal permeability of broilers is the lowest at 1 day of age and then increase. The relative expression level of Claudin-2 gene decreases gradually from duodenum to colon, and the permeability of anterior intestine (duodenum, jejunum and ileum) is higher than that of posterior intestine (cecum and colon). The developmental patterns of different tight junction proteins are different from each other, the interaction effects of age and intestinal segment on the relative expression levels of tight junction protein genes are significant.

Cite this article

WEN Xueting , XIAO Yingping , LYU Wentao , LIU Xiuting , YANG Caimei , WANG Yongxia , YANG Hua . Developmental Changes of Expression of Tight Junction Protein Genes in Broiler Intestine[J]. Chinese Journal of Animal Nutrition, 2020 , 32(10) : 4963 -4971 . DOI: 10.3969/j.issn.1006-267x.2020.10.047

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