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Related Concept Videos

Tension Response at Adherens Junctions01:26

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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.
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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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Author Spotlight: Understanding Mechanical Forces Involved in Shaping the Zebrafish Heart
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Stress sensitivity and mechanotransduction during heart development.

Stephanie Majkut1, P C Dave P Dingal2, Dennis E Discher3

  • 1Biophysical Engineering Laboratory, University of Pennsylvania, Philadelphia, PA 19104, USA; Physics and Astronomy Graduate Group, University of Pennsylvania, Philadelphia, PA 19104, USA.

Current Biology : CB
|May 22, 2014
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Summary

Mechanical stress profoundly influences embryonic heart development by altering gene expression and structural protein dynamics. This review explores how tissue mechanics and nuclear proteins like lamins regulate organ maturation and homeostasis.

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Area of Science:

  • Biophysics
  • Developmental Biology
  • Mechanobiology

Background:

  • Embryonic organs, including the heart, undergo significant changes in shape and mechanical properties during development.
  • A critical question is how mechanical stresses influence the gene regulatory networks governing organ maturation.

Purpose of the Study:

  • To review the mechanical maturation of the heart, lung, and blood.
  • To focus on structural proteins sensitive to mechanical stress and their role in tissue development.

Main Methods:

  • Review of existing literature on heart, lung, and blood development.
  • Focus on structural proteins like collagen and sarcomeric proteins.
  • Extension of concepts to nuclear mechanics involving lamins.
  • Proposal of a minimal network model for cell-matrix interactions.

Main Results:

  • Heart maturation involves increased collagen deposition and sarcomeric protein expression, enhancing contractile strength and blood pumping.
  • A dynamic cell-matrix interaction model is proposed, highlighting tension-stabilized biopolymers.
  • Lamin levels correlate with extracellular matrix mechanics across developing heart, lung, and blood tissues.

Conclusions:

  • Mechanical forces play a crucial role in the mechanochemistry of tissue development and homeostasis.
  • Understanding stress-sensitive differentiation and maturation offers a framework for quantitative biology and disease processes.
  • Lamins, as nuclear structural proteins, are implicated in tissue mechanics and associated diseases.