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Role of adhesion molecule ICAM in the pathogenesis of polymicrobial sepsis

Frank Hildebrand1, Hans-Christoph Pape, Paul Harwood

  • 1Hannover Medical School, Experimental Trauma Surgery, Trauma Department, Carl-Neuberg-Strasse I Hannover, 30625 Germany.

Experimental and Toxicologic Pathology : Official Journal of the Gesellschaft Fur Toxikologische Pathologie
|April 9, 2005
PubMed
Abstract

Insights

Intercellular adhesion molecule-1 (ICAM-1) plays a key role in sepsis-induced organ damage by facilitating polymorphonuclear leukocyte (PMNL) migration. Blocking ICAM-1 in mice significantly reduced sepsis severity, organ damage, and mortality.

Area of Science:

  • Immunology
  • Pathophysiology
  • Sepsis Research

Background:

  • Intercellular adhesion molecule-1 (ICAM-1) is implicated in polymorphonuclear leukocyte (PMNL) recruitment and organ damage during infection and inflammation.
  • The exact role of ICAM-1 in disease progression remains controversial.
  • This study investigates ICAM-1's effect on histological changes and cytokine synthesis in a murine polymicrobial sepsis model.

Purpose of the Study:

  • To elucidate the role of ICAM-1 in the pathophysiological response to polymicrobial sepsis.
  • To assess the impact of ICAM-1 deficiency on organ damage and cytokine production.
  • To evaluate the therapeutic potential of ICAM-1 modulation in sepsis.

Main Methods:

  • Polymicrobial sepsis induced via cecal ligation and puncture (CLP) in ICAM-1 knockout (ICAM-1-/-) and wild-type (WT) mice.
  • Clinical parameters, including weight loss and hypothermia, were monitored daily.
  • Histological changes in lung and liver tissues were assessed using light microscopy and a scoring system.
  • Plasma cytokine levels (TNF-alpha, IL-6, IL-10) were quantified using ELISA.

Main Results:

  • ICAM-1-/- mice exhibited a less severe clinical response, with significantly reduced weight loss, hypothermia, and a lower mortality rate (12.5% vs. 45.5% in WT).
  • Histological examination revealed no significant pulmonary or hepatic tissue damage in ICAM-1-/- mice post-CLP, unlike WT mice which showed leukocyte infiltration and tissue damage.
  • Pro- and anti-inflammatory cytokine synthesis (TNF-alpha, IL-6, IL-10) was significantly attenuated in ICAM-1-/- mice compared to WT controls.

Conclusions:

  • ICAM-1 plays a critical pathophysiological role in polymicrobial sepsis.
  • The absence of ICAM-1 impairs PMNL migration, reduces secondary organ damage, and improves clinical outcomes and survival.
  • Targeting ICAM-1 may represent a viable therapeutic strategy for sepsis management.

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