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Related Concept Videos

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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Intracellular Signaling Affects Focal Adhesions01:17

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
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Cell Adhesion Molecules - Types and Functions01:20

Cell Adhesion Molecules - Types and Functions

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Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical interactions between cells and provide mechanical strength to tissues. They also function as receptors for signal transmission across the plasma membrane. The CAMs are broadly classified into four families - integrins, cadherins, selectins, and immunoglobulin-like CAMs (IgCAMs).
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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
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Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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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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Related Experiment Video

Updated: May 28, 2025

Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface
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Adhesion-regulated dynamics of cells.

Shu-Yi Sun1, Xindong Chen1, Bo Li2

  • 1Institute of Biomechanics and Medical Engineering, AML, Department of Engineering Mechanics, Tsinghua University, Beijing, China.

Biophysical Journal
|February 13, 2025
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Summary

Cell adhesion and cytoskeleton contraction drive cell behavior. Inhibiting adhesion reveals diverse cell shapes and dynamics, influenced by substrate properties and internal forces.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biomechanics

Background:

  • Cellular dynamics are intrinsically linked to cytoskeleton contraction and cell-substrate adhesion.
  • Understanding these interactions is crucial for deciphering cell morphology and movement.

Purpose of the Study:

  • To investigate the impact of inhibiting cell-substrate adhesion on isolated cell behaviors.
  • To elucidate the biophysical mechanisms governing spontaneous cellular dynamics using a tensegrity model.

Main Methods:

  • Experimental manipulation of cell-substrate adhesion on various substrates.
  • Application of a biochemomechanical tensegrity model for cytoskeletal analysis.
  • Integration of living cell experiments with numerical simulations.

Main Results:

  • Isolated cells exhibit diverse morphologies and dynamics when adhesion is modulated.
  • Cellular dynamics transition through oscillation, protrusion, and spreading modes with increasing adhesion.
  • Two distinct oscillation patterns, global and traveling waves, were identified in oscillating cells.

Conclusions:

  • Cellular spatiotemporal dynamics are significantly mediated by environmental adhesion properties.
  • The interplay between intrinsic cytoskeletal activity and adhesion conditions dictates cell behavior.
  • This study provides insights into the fundamental principles governing cell motility and morphology.