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Related Experiment Videos

Ambient pulsatile pressure modulates endothelial cell proliferation

A G Vouyouka1, R J Powell, J Ricotta

  • 1Departments of Surgery, Yale University School of Medicine, New Haven, CT, USA.

Journal of Molecular and Cellular Cardiology
|May 9, 1998
PubMed
Summary
This summary is machine-generated.

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Pulsatile pressure significantly inhibits endothelial cell proliferation by day 5. This effect is mediated by an autocrine factor secreted by cells exposed to pulsatile pressure, not TGF-beta or IL-1.

Area of Science:

  • Cardiovascular Biology
  • Cell Biology
  • Biomedical Engineering

Background:

  • Circulatory forces like shear stress and strain impact endothelial cell (EC) phenotype.
  • The in vitro effects of direct pressure on EC remain largely unexplored.

Purpose of the Study:

  • To investigate the in vitro effects of static and pulsatile pressure on cultured endothelial cells.
  • To elucidate the mechanism behind pressure-induced changes in EC proliferation.

Main Methods:

  • Cultured bovine aortic EC were exposed to atmospheric, static (135 mmHg), or pulsatile (160/110 mmHg, 60 cycles/min) pressure.
  • EC proliferation was assessed via cell counting and 3H-thymidine incorporation.
  • Conditioned media transfer experiments were performed to investigate autocrine signaling.

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Main Results:

  • A significant decrease in EC cell number was observed by day 5 in both static and pulsatile pressure groups.
  • Cell morphology and viability remained unchanged across all conditions.
  • Conditioned media from pulsatile pressure-exposed EC inhibited proliferation in control EC, suggesting an autocrine factor.

Conclusions:

  • Pulsatile pressure induces an autocrine growth inhibitory effect in endothelial cells.
  • This inhibitory effect is not mediated by TGF-beta or IL-1.
  • Endothelial cells secrete autocrine factors in response to pulsatile pressure, influencing their proliferation.