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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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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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The electron transport chain is a critical component of cellular respiration, occurring in the inner mitochondrial membrane. It facilitates the transfer of high-energy electrons from reduced cofactors NADH and FADH₂ to molecular oxygen, the final electron acceptor. This transfer of electrons through a series of protein complexes is tightly coupled to the translocation of protons across the membrane, generating a proton gradient essential for ATP synthesis.Electron Flow and Proton...
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Related Experiment Video

Updated: Nov 4, 2025

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
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Adhesion-mediated mechanosignaling forces mitohormesis.

Kevin M Tharp1, Ryo Higuchi-Sanabria2, Greg A Timblin3

  • 1Center for Bioengineering and Tissue Regeneration, Department of Surgery, University of California, San Francisco, San Francisco, CA 94143, USA.

Cell Metabolism
|May 21, 2021
PubMed
Summary
This summary is machine-generated.

Cells sense extracellular matrix physical properties, activating a mitochondrial stress response. This adaptively tunes mitochondrial function, revealing mechanosignaling

Keywords:
UPRmtadhesionagingcancerextracellular matrixmechanical stressmechanotabolismmetabolismoxidative stresstension

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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Mechanobiology

Background:

  • Mitochondria are crucial for cell life and death, with their function impacted by the biochemical environment.
  • Dysfunctional mitochondria are implicated in aging and cancer.
  • Physical characteristics of the extracellular matrix change in aging and cancerous tissues.

Purpose of the Study:

  • To investigate if cells sense extracellular matrix physical properties.
  • To determine if this sensing activates a mitochondrial stress response.
  • To elucidate the mechanisms by which mitochondrial function is tuned in response to physical cues.

Main Methods:

  • Investigated cellular responses to varying extracellular matrix physical properties.
  • Analyzed mitochondrial function and stress responses.
  • Examined the roles of solute carrier family 9 member A1 (SLC9A1) and heat shock factor 1 (HSF1) in mediating the observed effects.

Main Results:

  • Cells sense and respond to the physical properties of the extracellular matrix.
  • This sensing activates a mitochondrial stress response.
  • Mitochondrial function is adaptively tuned via SLC9A1-dependent ion exchange and HSF1-dependent transcription.

Conclusions:

  • Adhesion-mediated mechanosignaling plays a role in cellular responses to the physical environment.
  • This pathway influences mitochondrial function.
  • Mechanosignaling may be an underappreciated factor in aging and cancer-related mitochondrial dysfunction.