Apical junction complex protein expression in the canine colon: differential expression of claudin-2 in the colonic mucosa in dogs with idiopathic colitis

Ridyard, A.E. , Brown, J.K., Rhind, S.M., Else, R.W., Simpson, J.W. and Miller, H.R.P. (2007) Apical junction complex protein expression in the canine colon: differential expression of claudin-2 in the colonic mucosa in dogs with idiopathic colitis. Journal of Histochemistry and Cytochemistry, 55(10), pp. 1049-1058. (doi: 10.1369/jhc.7A7211.2007) (PMID:17595339)

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Abstract

Canine idiopathic lymphocytic-plasmacytic colitis (LPC) is a well-recognized clinical and pathological entity in the dog, associated with altered immune cell populations and cytokine expression profiles. Clinical and experimental data indicate that alterations in the permeability of the intestinal epithelium contribute to the pathogenesis of a range of related conditions. The apical junction complex plays a significant role in regulating epithelial paracellular permeability, and we have characterized the distribution of a number of its component tight junction (ZO-1, occludin, claudin-2) and adherens junction (E-cadherin and β-catenin) proteins in normal colon and colon from dogs with idiopathic LPC. ZO-1, occludin, E-cadherin, and β-catenin exhibited a distribution in normal canine colon similar to that described previously in humans and rodents. In contrast to the situation in humans, claudin-2-specific labeling was observed in the normal canine colonic crypt epithelium, decreasing in intensity from the distal to the proximal crypt and becoming barely detectable at the luminal surface of the colon. There was little evidence for significant changes in ZO-1, occludin, E-cadherin, or β-catenin expression in dogs affected by idiopathic LPC. However, claudin-2 expression markedly increased in the proximal crypt and luminal colonic epithelium in affected dogs, suggesting a role in the pathogenesis of canine LPC.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ridyard, Ms Alison
Authors: Ridyard, A.E., Brown, J.K., Rhind, S.M., Else, R.W., Simpson, J.W., and Miller, H.R.P.
College/School:College of Medical Veterinary and Life Sciences > School of Veterinary Medicine
Journal Name:Journal of Histochemistry and Cytochemistry
Publisher:SAGE Publications
ISSN:0022-1554
ISSN (Online):1551-5044

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