A key claudin extracellular loop domain is critical for epithelial barrier integrity

Randall J Mrsny, G T Brown, K Gerner-Smidt, A G Buret, J B Meddings, C Quan, M Koval, A Nusrat

Research output: Contribution to journalArticle

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Abstract

Intercellular tight junctions (TJs) regulate epithelial barrier properties. Claudius are major structural constituents of TJs and belong to a large family of tetraspanning membrane proteins that have two predicted extracellular loops (ELs). Given that claudin-1 is widely expressed in epithelia, we further defined the role of its EL domains in determining TJ function. The effects of several claudin-1 EL mimetic peptides on epithelial barrier structure and function were examined. incubation of model human intestinal epithelial cells with a 27-amino acid peptide corresponding to a portion of the first EL domain (Cldn-1(53-80)) reversibly interfered with epithelial barrier function by inducing the rearrangement of key TJ proteins: occludin, claudin-1, junctional adhesion molecule-A, and zonula occludens-1. Cldn-1(53-80) associated with both claudin-1 and occludin, suggesting both the direct interference with the ability of these proteins to assemble into functional TJs and their close interaction under physiological conditions. These effects were specific for Cldn-1(53-80), because peptides corresponding to other claudin-1 EL domains failed to influence TJ function. Furthermore, the oral administration of Cldn-1(53-80) to rats increased paracellular gastric permeability. Thus, the identification of a critical claudin-1 EL motif, Cldn-1(53-80), capable of regulating TJ structure and function, offers a useful adjunct to treatments that require drug delivery across an epithelial barrier.
Original languageEnglish
Pages (from-to)905-915
Number of pages11
JournalAmerican Journal Of Pathology
Volume172
Issue number4
DOIs
Publication statusPublished - Apr 2008

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Claudin-1
Tight Junctions
Occludin
Peptides
Junctional Adhesion Molecule A
Tight Junction Proteins
Intercellular Junctions
Oral Administration
Permeability
Stomach
Membrane Proteins
Epithelium
Epithelial Cells
Amino Acids
Pharmaceutical Preparations

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Mrsny, R. J., Brown, G. T., Gerner-Smidt, K., Buret, A. G., Meddings, J. B., Quan, C., ... Nusrat, A. (2008). A key claudin extracellular loop domain is critical for epithelial barrier integrity. American Journal Of Pathology, 172(4), 905-915. https://doi.org/10.2353/ajpath.2008.070698

A key claudin extracellular loop domain is critical for epithelial barrier integrity. / Mrsny, Randall J; Brown, G T; Gerner-Smidt, K; Buret, A G; Meddings, J B; Quan, C; Koval, M; Nusrat, A.

In: American Journal Of Pathology, Vol. 172, No. 4, 04.2008, p. 905-915.

Research output: Contribution to journalArticle

Mrsny, RJ, Brown, GT, Gerner-Smidt, K, Buret, AG, Meddings, JB, Quan, C, Koval, M & Nusrat, A 2008, 'A key claudin extracellular loop domain is critical for epithelial barrier integrity', American Journal Of Pathology, vol. 172, no. 4, pp. 905-915. https://doi.org/10.2353/ajpath.2008.070698
Mrsny, Randall J ; Brown, G T ; Gerner-Smidt, K ; Buret, A G ; Meddings, J B ; Quan, C ; Koval, M ; Nusrat, A. / A key claudin extracellular loop domain is critical for epithelial barrier integrity. In: American Journal Of Pathology. 2008 ; Vol. 172, No. 4. pp. 905-915.
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