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Related Concept Videos

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
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Damage control of epithelial barrier function in dynamic environments.

Tomohito Higashi1, Akira C Saito1, Hideki Chiba1

  • 1Department of Basic Pathology, Fukushima Medical University, Fukushima 960-1295, Japan.

European Journal of Cell Biology
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Epithelial barrier function relies on occluding junctions that maintain tissue integrity. This review explores how epithelial cells dynamically sustain barrier function during tissue remodeling and rearrangement.

Keywords:
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Area of Science:

  • Cell Biology
  • Tissue Engineering
  • Developmental Biology

Background:

  • Epithelial tissues form essential barriers in multicellular organisms, maintaining internal homeostasis.
  • These tissues are composed of tightly packed cells forming sheets, with occluding junctions (tight and septate junctions) restricting paracellular diffusion.
  • Epithelial tissues are dynamic, undergoing constant cell renewal and tissue rearrangement, which challenges barrier integrity.

Purpose of the Study:

  • To review recent advancements in understanding how epithelial cells maintain barrier function in dynamic environments.
  • To highlight the mechanisms involved in sustaining epithelial integrity during tissue remodeling.
  • To identify and discuss outstanding questions in the field of epithelial barrier dynamics.

Main Methods:

  • This review synthesizes findings from recent experimental studies.
  • It integrates data from various model systems examining epithelial tissue dynamics.
  • The review focuses on the molecular and cellular mechanisms governing junctional remodeling and barrier maintenance.

Main Results:

  • Epithelial cells dynamically regulate occluding junctions to accommodate tissue rearrangement and cell turnover.
  • Mechanisms include junctional remodeling, localized cell extrusion, and coordinated cell movements.
  • These processes are crucial for maintaining barrier function despite significant tissue deformation.

Conclusions:

  • Epithelial cells possess sophisticated mechanisms to preserve barrier integrity during dynamic tissue remodeling.
  • Further research is needed to fully elucidate the molecular players and regulatory networks involved.
  • Understanding these dynamics is critical for fields ranging from developmental biology to regenerative medicine.