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Related Experiment Videos

Integrin activation and matrix binding mediate cellular responses to mechanical stretch.

Akira Katsumi1, Tomoki Naoe, Tadashi Matsushita

  • 1Cardiovascular Research Center, Departments of Microbiology and Biomedical Engineering, Mellon Prostate Research Institute, University of Virginia, Charlottesville, Virginia 22908, USA.

The Journal of Biological Chemistry
|March 12, 2005
PubMed
Summary
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Mechanical tension activates integrin alphavbeta3, a key cell sensor. This activation, mediated by phosphoinositol 3-kinase, enhances cell binding to the extracellular matrix, revealing a new mechanotransduction pathway.

Area of Science:

  • Cell biology
  • Biophysics
  • Biochemistry

Background:

  • Mechanical tension influences fundamental cellular processes like growth, differentiation, and apoptosis.
  • Integrins are known to sense cellular forces, but the mechanisms of force transduction into biochemical signals remain unclear.

Purpose of the Study:

  • To investigate how mechanical strain activates integrins.
  • To elucidate the molecular pathway linking mechanical forces to cellular responses via integrins.

Main Methods:

  • Utilized NIH3T3 cells to study mechanical strain effects.
  • Investigated the role of integrin alphavbeta3 conformational changes.
  • Assessed the involvement of phosphoinositol 3-kinase (PI3K) and c-Jun N-terminal kinase (JNK) signaling pathways.

Related Experiment Videos

Main Results:

  • Mechanical stretch induced conformational activation of integrin alphavbeta3.
  • Integrin activation was dependent on phosphoinositol 3-kinase (PI3K).
  • Activated integrins showed increased binding to extracellular matrix proteins, which was necessary for mechanical stretch-induced JNK activation.

Conclusions:

  • Defined a molecular mechanism for integrin-mediated mechanotransduction.
  • Demonstrated that mechanical forces activate integrins conformationally.
  • Highlighted the sequential role of PI3K, integrin activation, extracellular matrix binding, and JNK signaling in cellular mechanosensing.