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Updated: Jun 24, 2026

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ICAM-1 signaling in endothelial cells

Charlotte Lawson1, Sabine Wolf

  • 1Veterinary Basic Sciences, Royal Veterinary College, London, UK. chlawson@rvc.ac.uk

Pharmacological Reports : PR
|March 25, 2009
PubMed

Insights

Intercellular adhesion molecule-1 (ICAM-1) is crucial for leukocyte movement and inflammation. Elevated soluble ICAM-1 (sICAM-1) levels indicate disease, and ICAM-1 directly promotes atherosclerosis.

Area of Science:

  • Immunology
  • Cardiovascular Biology
  • Cell Biology

Background:

  • Intercellular adhesion molecule-1 (ICAM-1; CD54) is an immunoglobulin superfamily member vital for leukocyte extravasation.
  • ICAM-1 expression on endothelial cells increases with inflammation and is elevated in atherosclerosis and autoimmune diseases.
  • Soluble ICAM-1 (sICAM-1) is found in body fluids, with higher levels in cardiovascular diseases.

Purpose of the Study:

  • To investigate the role of ICAM-1 beyond leukocyte adhesion.
  • To explore ICAM-1's direct contribution to inflammatory signaling within blood vessel walls.
  • To understand ICAM-1's impact on endothelial cell activation and atherosclerotic plaque formation.

Main Methods:

  • Review of existing literature on ICAM-1 function and expression.
  • Analysis of studies involving ICAM-1 ligation on endothelial and smooth muscle cells.
  • Examination of sICAM-1 levels in patients with various cardiovascular and autoimmune conditions.

Main Results:

  • ICAM-1 ligation triggers proinflammatory signaling cascades and actin cytoskeleton rearrangement.
  • Elevated sICAM-1 levels are associated with atherosclerosis, heart failure, and transplant vasculopathy.
  • sICAM-1 exhibits signaling properties, inducing proinflammatory responses in endothelial cells.

Conclusions:

  • ICAM-1 directly contributes to inflammatory responses in the blood vessel wall.
  • ICAM-1 enhances endothelial cell activation and promotes atherosclerotic plaque formation.
  • ICAM-1 plays a dual role in leukocyte adhesion and direct vascular inflammation.

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