Cited by 103Inflammatory Bowel DiseaseCellular transport and secretionBarrier Structure and Function Studies

The Epithelium in Inflammatory Bowel Disease: Potential Role of Endocytosis of Junctional Proteins in Barrier Disruption

Ivanov, Andrei I., Nusrat, Asma, Parkos, Charles A.·2004·Novartis Foundation Symposia

Abstract

A key feature of inflammatory bowel disease (IBD) is disruption of the intestinal epithelial barrier by unknown mechanisms. Integrity of the epithelial barrier is determined by an apical junctional complex that is composed of tight junction (TJ) and adherens junction (AJ). Previous observations have suggested that alterations in the apical junctional complex occur in IBD. Localization studies in mucosal biopsies from IBD patients have revealed disappearance of key TJ (occludin, JAM1, ZO1, claudin 1) and AJ (E-cadherin, beta-catenin) proteins from intercellular junctions. In vitro experiments examining the effects of inflammatory cytokines on model intestinal epithelial monolayers suggest that disruption of the epithelial barrier is associated with internalization of transmembrane TJ proteins, JAM1, ocdudin and claudins 1/4. The mechanism(s) of internalization of intercellular junctions can be modelled in vitro by calcium depletion of confluent epithelial cell monolayers. Using this model, we have observed rapid, orchestrated endocytosis of all AJ and TJ proteins into a subapical cytoplasmic compartment that is independent of caveolae/lipid rafts and macropinocytosis. However, inhibitors of clathrin-mediated endocytosis effectively block internalization of AJs and TJs, and junctional proteins colocalize with clathrin. Interestingly, internalized AJ and TJ proteins enter early endosomes followed by movement to organelles that do not label with markers of late and recycling endosomes, lysosomes or Golgi but appear to represent a unique storage compartment that colocalizes with t-SNARE protein, syntaxin 4. A better understanding of the mechanisms of junctional internalization and recycling will likely provide new insights into the mechanisms of altered barrier function in IBD.

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Crossref · 10.1002/0470090480.ch9

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  • Defects in tight junction and adherens junction endocytosis leading to barrier disruption in inflammatory bowel disease have been reported long ago.

    “The defects in TJs and AJs endocytosis leading to barrier disruption in IBD have been reported long ago [199].”

    From Insights of Endocytosis Signaling in Health and Disease (2023) · cites this paper as [199]

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Authors
Ivanov, A. I., Nusrat, A., & Parkos, C. A.
Affiliations
Emory University (US)
Corresponding author
Parkos, Charles A.
Venue
Novartis Foundation Symposia
Publisher
Wiley
Published
2004-11-12
Volume
263
Pages
115-132
ISSN
  • 1528-2511 (ISSN-L)
  • 1935-4657
OpenAlex
W1525528026
Cited by
103
References
17
Citations by year
2026: 3 · 2025: 2 · 2024: 2 · 2023: 3 · 2022: 3 · 2021: 9 · 2020: 5 · 2019: 5 · 2018: 5 · 2017: 5 · 2016: 4 · 2015: 4 · 2014: 6 · 2013: 7 · 2012: 7
Type
other
Language
en
Open access
closed
Locations
  • Novartis Foundation symposium (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (R01DK061379, DK53202, Z01DK053202, DK59888, DK-61379, R01DK059888)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Inflammatory Bowel Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
Keywords
inflammatory bowel disease, intestinal epithelial barrier, tight junctions, adherens junctions, endocytosis, clathrin-mediated endocytosis, early endosomes, syntaxin 4, t-SNARE, calcium depletion, occludin, claudin-1, β-catenin, E-cadherin, barrier disruption, inflammatory cytokines
MeSH terms
Calcium, Cells, Cultured, Endocytosis, Epithelial Cells, Epithelium, Humans, Intestines, Time Factors, Blotting, Western, Inflammatory Bowel Diseases, Tight Junctions, Membrane Microdomains, Multiprotein Complexes

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