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Related Experiment Videos

Platelets decrease albumin permeability of pulmonary artery endothelial cell monolayers.

J M Shepard1, D G Moon, P F Sherman

  • 1Department of Physiology, Albany Medical College, New York 12208.

Microvascular Research
|May 1, 1989
PubMed
Summary
This summary is machine-generated.

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Platelets reduce endothelial cell permeability to albumin. This effect is mediated by hydrophilic factors released from platelets, not mechanical blockage.

Area of Science:

  • Vascular Biology
  • Hematology
  • Cell Biology

Background:

  • Endothelial cell permeability is crucial for regulating substance exchange.
  • Platelets are known to influence vascular functions, including endothelial cell behavior.

Purpose of the Study:

  • To investigate the effect of platelets on endothelial cell permeability to albumin.
  • To identify the mechanism by which platelets modulate endothelial barrier function.

Main Methods:

  • Cultured bovine pulmonary artery endothelial cell monolayers were used.
  • 125I-albumin flux across endothelial cell monolayers was quantified.
  • Effects of washed platelets, fixed platelets, red blood cells, and platelet lysates were assessed.

Main Results:

Related Experiment Videos

  • Platelets significantly decreased 125I-albumin flux in a concentration-dependent manner.
  • Fixed platelets and red blood cells did not alter permeability.
  • Platelet lysates also reduced albumin flux, indicating a soluble factor.

Conclusions:

  • Platelets decrease endothelial permeability via soluble, hydrophilic factors.
  • The effect is not due to mechanical obstruction or known receptor pathways.
  • Platelet-derived factors play a role in maintaining endothelial barrier integrity.