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Tight junctions and human diseases.

Norimasa Sawada1, Masaki Murata, Keisuke Kikuchi

  • 1Department of Pathology, Sapporo Medical University School of Medicine, S1, W17, Sapporo 060-8556, Japan. sawadan@sapmed.ac.jp

Medical Electron Microscopy : Official Journal of the Clinical Electron Microscopy Society of Japan
|September 25, 2003
PubMed
Summary

Tight junctions control what passes through cells and maintain cell structure. Disruptions in tight junctions are linked to diseases like cancer, deafness, and infections.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Pathophysiology

Background:

  • Tight junctions are crucial intercellular structures with barrier and fence functions.
  • These functions regulate paracellular transport and maintain cell polarity.
  • Dysfunction is implicated in diseases including edema, metastasis, and loss of polarity.

Purpose of the Study:

  • To review the relationship between tight junctions and human diseases.
  • To highlight the roles of tight junction proteins, particularly claudins.
  • To discuss the impact of tight junction integrity on cellular functions and disease.

Main Methods:

  • Literature review of tight junction research.
  • Analysis of the roles of integral membrane proteins (occludin, claudins, JAMs).

Related Experiment Videos

  • Examination of the dependence on actin cytoskeleton and ATP.

    • Main Results:

    • Tight junctions regulate paracellular passage and cell polarity.
    • Claudins are key to tight junction strand formation and cytoskeletal connection.
    • Mutations in claudins cause hereditary conditions; pathogens can disrupt tight junction function.

    Conclusions:

    • Tight junction integrity, dependent on the actin cytoskeleton and ATP, is vital for health.
    • Altered tight junction function contributes to various human diseases.
    • Understanding tight junctions offers insights into disease mechanisms and potential therapies.