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Related Concept Videos

Anchoring Junctions01:03

Anchoring Junctions

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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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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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Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
Anchoring junctions mechanically attach a cell to the...
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Gap Junctions01:37

Gap Junctions

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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
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Lateral junction dynamics lead the way out.

Martin Behrndt1, Carl-Philipp Heisenberg1

  • 1Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria.

Nature Cell Biology
|February 1, 2014
PubMed
Summary
This summary is machine-generated.

Epithelial cell layer integrity relies on N-WASP, which stabilizes actin filaments. This stabilization drives contractility at cell junctions, crucial for proper epithelial function and tissue formation.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Epithelial cell layers require tight regulation for integrity and function.
  • Cell-cell junctions, particularly those involving E-cadherin, are critical for epithelial organization.

Purpose of the Study:

  • To elucidate the molecular mechanisms governing cell integration into epithelial sheets.
  • To investigate the role of N-WASP in regulating epithelial cell-cell junctions and contractility.

Main Methods:

  • Studied the stabilization of cortical F-actin.
  • Analyzed the role of N-WASP in cell integration.
  • Investigated contractility patterns at E-cadherin-based cell-cell junctions.

Main Results:

  • Cell integration into epithelial sheets depends on N-WASP-regulated F-actin stabilization.
  • N-WASP activity generates distinct patterns of apical-lateral contractility.
  • This contractility is specifically localized at E-cadherin-based cell-cell junctions.

Conclusions:

  • N-WASP is a key regulator of epithelial integrity through F-actin stabilization.
  • The N-WASP pathway controls cell-cell junction contractility, influencing epithelial sheet formation.
  • Understanding this mechanism is vital for comprehending epithelial tissue development and homeostasis.