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Related Concept Videos

Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

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...
Cell Migration01:19

Cell Migration

Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
Cell Migration01:09

Cell Migration

Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

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 homology) domains...
Role of Myosin in Cell Migration01:18

Role of Myosin in Cell Migration

Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II  is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction. It is...
Cell Motility through Blebbing01:16

Cell Motility through Blebbing

Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...

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Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions
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Published on: June 16, 2018

Traction forces exerted by epithelial cell sheets.

A Saez1, E Anon, M Ghibaudo

  • 1Laboratoire Matière et Systèmes Complexes (MSC), UMR CNRS 7057 and Université Paris Diderot, Paris, France.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 10, 2011
PubMed
Summary
This summary is machine-generated.

Researchers measured the mechanical forces of epithelial cell sheets using flexible micropillars. Cell forces depend on position, with edges exerting the most force, and cells deform substrates rather than applying a fixed force.

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Area of Science:

  • Cellular mechanics
  • Biophysics
  • Tissue engineering

Background:

  • Individual cell mechanics are understood, but multicellular assembly mechanics remain unclear.
  • Epithelial cells form sheets and their collective force generation is a key area of research.

Purpose of the Study:

  • To investigate the mechanics of multicellular epithelial cell assemblies.
  • To quantify traction forces exerted by cell sheets on substrates.

Main Methods:

  • Microfabricated substrates with flexible micropillars to measure traction forces.
  • Video microscopy and custom particle tracking software for pillar deflection analysis.
  • Culturing epithelial cells on micropatterned substrates with varying stiffness.

Main Results:

  • Traction forces are highest at the edges of cell islands and decrease internally.
  • Epithelial cells apply deformation proportional to substrate rigidity, not a fixed force.
  • Cellular growth aligns with the stiffest direction on anisotropic substrates.

Conclusions:

  • Cellular force exertion is position-dependent within epithelial sheets.
  • Cells adapt their mechanical response based on substrate properties.
  • Anisotropic substrates can guide cellular growth through mechanical cues.