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Related Concept Videos

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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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. 
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The Bone Matrix01:18

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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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Overview of the Cytoskeleton
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶   microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their...
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Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
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A Fluorescent Intravital Imaging Approach to Study Load-Induced Calcium Signaling Dynamics in Mouse Osteocytes
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The cytoskeleton and connected elements in bone cell mechano-transduction.

Nicole R Gould1, Olivia M Torre1, Jenna M Leser1

  • 1Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD 21201, USA.

Bone
|April 23, 2021
PubMed
Summary

Bone cells sense mechanical stress through their entire cytoskeleton, not just individual parts. Understanding this complex network is key to developing treatments for bone loss and improving bone health.

Keywords:
ActinCytoskeletonIntermediate filamentsMechano-transductionMicrotubulesOsteocyte

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Skeletal Biology

Background:

  • Bone is a dynamic tissue that responds to mechanical forces.
  • Mechanical stress influences bone mass and quality.
  • Understanding cellular mechanotransduction is crucial for bone health interventions.

Purpose of the Study:

  • To review the role of cytoskeletal components in bone cell mechanotransduction.
  • To present a unified view of how the cytoskeleton functions as a mechanosensor.
  • To identify potential therapeutic targets for bone disorders.

Main Methods:

  • Literature review of studies on cytoskeletal elements in bone cells.
  • Analysis of the interconnectedness and interactions of microtubules, actin, and intermediate filaments.
  • Synthesis of current knowledge on bone cell mechanotransduction.

Main Results:

  • Individual cytoskeletal components (microtubules, actin, intermediate filaments) act as mechanosensors.
  • The cytoskeleton functions as an integrated network for sensing mechanical cues.
  • Cytoskeletal interactions are essential for proper bone cell response to mechanical stress.

Conclusions:

  • The entire cytoskeleton, not isolated components, is critical for bone cell mechanotransduction.
  • A holistic understanding of cytoskeletal dynamics is needed to target bone diseases.
  • Further research into the integrated cytoskeleton may reveal novel therapeutic strategies for bone disorders.