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Related Experiment Video

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JNK2 promotes endothelial cell alignment under flow.

Cornelia Hahn1, Chong Wang, A Wayne Orr

  • 1Department of Microbiology, University of Virginia, Charlottesville, Virginia, United States of America.

Plos One
|September 13, 2011
PubMed
Summary
This summary is machine-generated.

Endothelial cells adapt to blood flow by activating c-Jun N-terminal kinase (JNK) pathways. This inflammatory response, mediated by integrins, is crucial for cell alignment and adaptation to shear stress.

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Area of Science:

  • Cell biology
  • Biophysics
  • Vascular biology

Background:

  • Endothelial cells in arteries align with blood flow, a phenomenon linked to reduced atherosclerosis.
  • c-Jun N-terminal kinase (JNK) is activated by flow and implicated in inflammation and apoptosis.
  • Previous work indicated JNK activation by flow depends on integrins and fibronectin.

Purpose of the Study:

  • To investigate the role of JNK2 activation in endothelial cell alignment under laminar shear stress.
  • To elucidate the mechanisms linking integrin activation, JNK signaling, and cell adaptation to flow.

Main Methods:

  • Utilized siRNA to reduce JNK2 activation.
  • Examined JNK2 localization and activation patterns in response to laminar shear stress.
  • Assessed endothelial cell alignment on different extracellular matrix proteins (fibronectin, collagen).

Main Results:

  • JNK2 activation by laminar shear stress is biphasic, with early and late peaks.
  • Activated JNK2 localizes to focal adhesions and requires integrin-extracellular matrix binding.
  • Inhibition of JNK2 activation by siRNA impaired cell alignment.
  • Cells cultured on collagen, with low JNK activity, showed slower alignment.

Conclusions:

  • An inflammatory pathway involving JNK2 facilitates endothelial cell adaptation to laminar flow.
  • Integrins and extracellular matrix interactions are critical for JNK-mediated flow adaptation.
  • Reveals an unexpected link between inflammatory signaling and adaptive responses in vascular cells.