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Gastrointestinal mucosal barrier function and diseases.

Tadayuki Oshima1, Hiroto Miwa2

  • 1Division of Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya, Hyogo, 663-8501, Japan. t-oshima@hyo-med.ac.jp.

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Tight junctions (TJ) proteins maintain the gastrointestinal barrier. Dysregulation of these proteins contributes to gastrointestinal diseases and cancer progression, offering potential therapeutic targets.

Keywords:
CancerClaudinEsophagitisIrritable bowel syndromePermeabilityTight junction

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Area of Science:

  • Gastroenterology
  • Cell Biology
  • Molecular Biology

Background:

  • The gastrointestinal mucosal barrier is crucial for separating internal and external environments.
  • Tight junctions (TJs) formed by TJ proteins (claudins, occludin, JAMs, ZO) are key to epithelial barrier integrity and cell polarity.

Purpose of the Study:

  • To review the role of TJ proteins in gastrointestinal barrier function.
  • To explore TJ protein dysregulation in gastrointestinal diseases and cancer.
  • To discuss TJ proteins as potential therapeutic targets and biomarkers.

Main Methods:

  • Literature review of studies on gastrointestinal barrier function and TJ proteins.
  • Analysis of TJ protein expression and localization in various gastrointestinal diseases.
  • Examination of the link between TJ proteins and disease pathogenesis, progression, and prognosis.

Main Results:

  • TJ proteins, particularly claudins, are essential for maintaining epithelial barrier function and cell polarity.
  • Disruption of TJ protein function is implicated in diseases like reflux esophagitis, inflammatory bowel disease, and gastrointestinal cancers.
  • TJ proteins influence tumor infiltration and metastasis, suggesting their role in cancer progression and prognosis.

Conclusions:

  • Regulation of TJ protein expression and localization presents a promising therapeutic strategy for gastrointestinal diseases.
  • Targeting TJ proteins may alter symptom generation and immune dysfunction by improving mucosal barrier function.
  • TJ proteins hold potential as biomarkers for cancer progression and patient prognosis, guiding the development of novel therapies.