Cited by 27Cellular transport and secretionBarrier Structure and Function StudiesIon Transport and Channel Regulation

The DOI matches its Crossref record; 35 of the 35 references it cites were found in a registry or an index.

Analysis of Occludin Trafficking, Demonstrating Continuous Endocytosis, Degradation, Recycling and Biosynthetic Secretory Trafficking

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Abstract

Tight junctions (TJs) link adjacent cells and are critical for maintenance of apical-basolateral polarity in epithelial monolayers. The TJ protein occludin functions in disparate processes, including wound healing and Hepatitis C Virus infection. Little is known about steady-state occludin trafficking into and out of the plasma membrane. Therefore, we determined the mechanisms responsible for occludin turnover in confluent Madin-Darby canine kidney (MDCK) epithelial monolayers. Using various biotin-based trafficking assays we observed continuous and rapid endocytosis of plasma membrane localised occludin (the majority internalised within 30 minutes). By 120 minutes a significant reduction in internalised occludin was observed. Inhibition of lysosomal function attenuated the reduction in occludin signal post-endocytosis and promoted co-localisation with the late endocytic system. Using a similar method we demonstrated that ∼20% of internalised occludin was transported back to the cell surface. Consistent with these findings, significant co-localisation between internalised occludin and recycling endosomal compartments was observed. We then quantified the extent to which occludin synthesis and transport to the plasma membrane contributes to plasma membrane occludin homeostasis, identifying inhibition of protein synthesis led to decreased plasma membrane localised occludin. Significant co-localisation between occludin and the biosynthetic secretory pathway was demonstrated. Thus, under steady-state conditions occludin undergoes turnover via a continuous cycle of endocytosis, recycling and degradation, with degradation compensated for by biosynthetic exocytic trafficking. We developed a mathematical model to describe the endocytosis, recycling and degradation of occludin, utilising experimental data to provide quantitative estimates for the rates of these processes.

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Crossref · 10.1371/journal.pone.0111176

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  • Proper assembly and functioning of junctional proteins are channelized through exocytic transportation of newly synthesized proteins to the cell surface and recycling of mature tight junctions and adherens junctions via endocytosis.

    “The proper assembly and functioning of junctional proteins are channelized through exocytic transportation of newly synthesized proteins to the cell surface and recycling of mature TJs and AJs via endocytosis [198].”

    From Insights of Endocytosis Signaling in Health and Disease (2023) · cites this paper as [198]

    The Abstract reports that occludin, a tight-junction protein, undergoes endocytosis and recycling, while biosynthetic exocytic trafficking replenishes it at the cell surface. The study concerns occludin in MDCK epithelial cells; it does not establish the same pathways for adherens junctions or show that they ensure proper junction assembly and function. (LLM, conf=0.87)

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Research works printed but not linked: 1

  1. S Morimoto, 2005, Rab13 mediates the continuous endocytic recycling of occludin to the cell surface, J Biol Chem, 280, 2220, 10.1074/jbc.m406906200 · DOI

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Metadata

Authors
Fletcher, S. J., Iqbal, M., Jabbari, S., Stekel, D., & Rappoport, J. Z.
Affiliations
  • University of Birmingham (GB)
  • University of Nottingham (GB)
  • Northwestern University (US)
Corresponding author
Fletcher, Sarah J.
Venue
PLoS ONE
Published
2014-11-25
Volume
9
Issue
11
Pages
e111176
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1987282988
Cited by
25
References
35
Citations by year
2026: 3 · 2025: 2 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 2 · 2017: 4 · 2016: 1 · 2015: 1
FWCI
1.00
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Repository@Nottingham (University of Nottingham) (publishedVersion, cc-by)
  • Repository@Nottingham (University of Nottingham) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • Research Explorer (The University of Manchester) (submittedVersion)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion, cc-by)
Funders
  • Advantage West Midlands
  • Directorate for Biological Sciences
  • Medical Research Council
  • Biotechnology and Biological Sciences Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
Keywords
occludin, tight junctions, protein trafficking, endocytosis, protein degradation, recycling endosomes, lysosomes, protein turnover, mathematical model, MDCK cells, apical-basal polarity
MeSH terms
Animals, Dogs, Endocytosis, Protein Processing, Post-Translational, Tight Junctions, Protein Transport, Secretory Pathway, Proteolysis, Madin Darby Canine Kidney Cells, Occludin

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