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Related Concept Videos

Anchoring Junctions01:03

Anchoring Junctions

4.3K
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Adherens Junctions01:24

Adherens Junctions

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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.
Adherens Junctions are Dynamic
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Overview of Cell-Cell Junctions01:14

Overview of Cell-Cell Junctions

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The complex three-dimensional arrangement of cells in any multicellular organism is defined and maintained by interactions of cells with each other and the extracellular matrix. Cell-cell junctions are specialized structures where the multi-protein complexes on one cell interact with the multi-protein complexes on another  cell. These cell junctions are classified  into three main types based on their function — occluding, anchoring, and gap junctions.
Occluding or Tight...
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Overview of Cell-Cell Junctions01:14

Overview of Cell-Cell Junctions

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Tight Junctions01:29

Tight Junctions

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Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
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Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin...
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Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Epithelial adhesive junctions.

Christopher T Capaldo1, Attila E Farkas1, Asma Nusrat1

  • 1Epithelial Pathobiology Research Unit, Department of Pathology, Emory University 615 Michael Street, Atlanta, GA 30322 USA.

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Summary
This summary is machine-generated.

This review covers recent advances in understanding the composition and function of epithelial cell junctions, focusing on tight junctions, adherens junctions, and desmosomes.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Epithelial cells form critical barriers and tissues through specialized cell-to-cell contacts.
  • These contacts, including tight junctions, adherens junctions, and desmosomes, are complex multiprotein structures.
  • Understanding their molecular composition and dynamic functions is crucial for tissue integrity and signaling.

Purpose of the Study:

  • To review recent significant advancements in the field of epithelial cell junctions.
  • To highlight novel insights into the molecular composition of tight junctions, adherens junctions, and desmosomes.
  • To discuss the functional implications of these recent discoveries.

Main Methods:

  • Literature review of recent research.
  • Synthesis of findings on junctional protein complexes.
  • Analysis of functional studies related to epithelial adhesion.

Main Results:

  • Identification of newly characterized proteins within junctional complexes.
  • Elucidation of novel regulatory mechanisms governing junction assembly and stability.
  • New understanding of how junctions mediate specific cellular processes.

Conclusions:

  • Recent research has significantly expanded our knowledge of epithelial junction complexity.
  • Advances in understanding junction composition and function offer new therapeutic targets.
  • Continued investigation is vital for fully appreciating the roles of these structures in health and disease.