Mucosal function in rat jejunum and ileum is altered by induction of colitis

Einat Amit-Romach, Ram Reifen, Zehava Uni*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Many studies dealing with trinitrobenzene sulfonic acid (TNBS) colitis in rats have been carried out refering only to the colon. In humans, ulcerative colitis (UC) can extend a variable distance into the terminal ileum in a phenomenon known as backwash ileitis (BWI). The aim of this study was therefore to examine the effect of TNBSinduced colitis on different aspects of the rat ileum and jejunum. We hypothesized that TNBS administration would lead to a systemic influence on the small intestine. Rats were induced colitis by administration of 0.25 ml of 2,4,6-trinitrobenzene sulfonic acid and 72 h after colitis induction animals were sacrificed. Segments were taken of the colon, ileum and jejunum. In addition to mucin mRNA expression, morphological changes were observed in the jejunum and ileum. We examined the mRNA expression and biochemical activity of brush border enzyme, sucrase iso-maltase and aminopeptidase, in all three segments. The villous surface area of colitis-induced rats was smaller in jejunum and ileum compared to control. In the jejunum of TNBS-induced rats, goblet-cell volume increased and their density decreased. The relative amount of MUC2 mRNA decreased in the jejunum, ileum and colon of colitis rat. However, MUC3 mRNA expression increased in the ileum and colon of these rats. Sucrase isomaltase expression and activity decreased in the ileum of TNBS-induced rats, while aminopeptidase activity was lower in the jejunum. These observations suggest that intrarectal administration of TNBS to rats influences not only their colon and terminal ileum, but also the proximal ileum and jejunum. Involvement of the ileum and jejunum in TNBSinduced colitis may be related to the systemic reaction of the immune system and mucosa to colitis.

Original languageAmerican English
Pages (from-to)721-727
Number of pages7
JournalInternational Journal of Molecular Medicine
Volume18
Issue number4
DOIs
StatePublished - Oct 2006

Keywords

  • BBM enzyme
  • Gene expression
  • Inflammatory bowel disease
  • Mucin
  • Rat model

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