J Neurogastroenterol Motil.  2018 Jan;24(1):147-158. 10.5056/jnm17012.

Inflammation, Impaired Motility, and Permeability in a Guinea Pig Model of Postoperative Ileus

Affiliations
  • 1Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea.
  • 2Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea. HJPARK21@yuhs.ac

Abstract

BACKGROUND/AIMS
Postoperative ileus (POI) is characterized by impaired propulsive function of the gastrointestinal tract after surgery. Although inflammation is considered to be an important pathogenesis of POI, significant data are lacking. We aim to correlate the recovery time of postoperative dysmotility with that of inflammation and mucosal permeability.
METHODS
An experimental POI model of guinea pig was used. Contractile activity of the circular muscle of the stomach, jejunum, ileum, and proximal colon was measured through a tissue bath study. Inflammatory cells were counted, and the expression of calprotectin and tryptase were analyzed. The expression of protease-activated receptor 2 (PAR-2), claudin-1, and claudin-2 were analyzed with immunofluorescence.
RESULTS
The small bowel and colon showed decreased contractile amplitude in the POI groups compared to control. In contrast to the colon, the contractile amplitude of the small bowel significantly recovered in the POI group at 6 hours after the operation compared to the control group. Inflammation was highly significant in the POI groups compared to the control and sham groups, especially in the colon. Immunofluorescence showed increased PAR-2 expression in the POI groups compared to sham. The decreased claudin-1 expression and increased claudin-2 expression may suggest increased mucosal permeability of the small bowel and colon in the POI groups.
CONCLUSIONS
Increased inflammation and mucosal permeability may play an important role in the differential recovery stages in POI. These data may provide further insights into the pathophysiology and potential new therapeutic prospects of POI.

Keyword

Ileus; Inflammation; Permeability

MeSH Terms

Animals
Baths
Claudin-1
Claudin-2
Colon
Fluorescent Antibody Technique
Gastrointestinal Tract
Guinea Pigs*
Guinea*
Ileum
Ileus*
Inflammation*
Jejunum
Leukocyte L1 Antigen Complex
Permeability*
Receptor, PAR-2
Stomach
Tryptases
Claudin-1
Claudin-2
Leukocyte L1 Antigen Complex
Receptor, PAR-2
Tryptases
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