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[Role of adhesion molecules in the development of acute lung injury]
1Department of Pulmonary Medicine, Jichi Medical School, Tochigi, Japan.
Abstract:
Polymorphonuclear neutrophils (PMN) play a central role in the development of acute lung injury. Sequestered and activated PMN in the lungs produce inflammatory mediators such as reactive oxygen intermediates and proteases, which increase endothelial permeability. The interaction of PMN and endothelial cells mediated by adhesion molecules is a crucial step in PMN-mediated injury. These molecules mediate the adhesion of PMN to endothelial cells, and the migration of PMN into the interstitium. In these steps, PMN are also activated by adhesion molecules. We examined the role of adhesion molecules in the PMN-mediated increase in endothelial permeability in vivo with a rat model of lung injury, and in vivo with an assay of endothelial monolayer permeability.
Insights
Adhesion molecules mediate polymorphonuclear neutrophil (PMN) activation and migration, increasing lung injury and endothelial permeability. Blocking these molecules could reduce acute lung injury development.
Area of Science:
- Immunology
- Cell Biology
- Pulmonary Medicine
Context:
- Polymorphonuclear neutrophils (PMN) are key players in acute lung injury (ALI).
- Activated PMN release mediators that increase endothelial permeability.
- PMN-endothelial cell interactions, mediated by adhesion molecules, are critical for PMN-induced injury.
Purpose:
- To investigate the role of adhesion molecules in PMN-mediated endothelial permeability in acute lung injury.
- To analyze PMN adhesion and migration into the interstitium.
- To understand PMN activation by adhesion molecules.
Summary:
- Adhesion molecules facilitate PMN adhesion to endothelial cells and their migration into lung tissue.
- This interaction leads to PMN activation and the release of damaging mediators.
- The study utilized an in vivo rat model and an in vitro endothelial monolayer assay.
Impact:
- Findings highlight adhesion molecules as critical targets for therapeutic intervention in ALI.
- Understanding these interactions can lead to novel strategies for preventing or treating lung injury.
- This research contributes to the broader understanding of inflammatory processes in the lungs.