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Characterization of rat lung ICAM-1

B Beck-Schimmer1, R C Schimmer, H Schmal

  • 1Department of Pathology, University of Michigan Medical School, Ann Arbor 48109-0602, USA.

Inflammation Research : Official Journal of the European Histamine Research Society ... [Et Al.]
|August 27, 1998
PubMed
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This study demonstrates that intercellular adhesion molecule-1 (ICAM-1) is crucial in lung inflammation models. Upregulation of ICAM-1 involves both vascular endothelial cells and alveolar macrophages.

Area of Science:

  • Immunology
  • Cell Biology
  • Pulmonary Medicine

Background:

  • Intercellular Adhesion Molecule-1 (ICAM-1) is a key mediator in inflammatory responses.
  • Understanding ICAM-1's role in lung inflammation is critical for developing targeted therapies.

Purpose of the Study:

  • To investigate the upregulation of ICAM-1 in experimental lung inflammatory conditions.
  • To characterize the expression patterns of ICAM-1 in response to specific inflammatory stimuli.
  • To identify the cell types involved in ICAM-1-mediated lung inflammation.

Main Methods:

  • Soluble rat ICAM-1 was expressed using bacterial and baculovirus systems.
  • Rat pulmonary artery endothelial cells (RPAEC) and alveolar macrophages were stimulated with lipopolysaccharide (LPS) and tumor necrosis factor-alpha (TNF-alpha).

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  • In vivo studies utilized immunoglobulin G (IgG) immune complex-induced lung injury, with ICAM-1 expression analyzed via ELISA, Western blot, Northern blot, and immunohistochemistry.

    • Main Results:

    • ICAM-1 expression in RPAEC showed time- and dose-dependent increases following LPS stimulation, peaking at 6 hours.
    • Both LPS and TNF-alpha enhanced ICAM-1 expression on alveolar macrophages, with maximal expression at 2 hours.
    • In vivo, ICAM-1 mRNA levels in the lung peaked at 4 hours, and protein levels peaked at 6 hours after IgG immune complex induction.

    Conclusions:

    • ICAM-1 plays a significant role in the studied lung inflammatory models.
    • Lung ICAM-1 upregulation involves both vascular endothelial cells and alveolar macrophages.
    • The findings provide insights into the cellular mechanisms of ICAM-1 in pulmonary inflammation.