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Adhesive interactions between fibroblasts and polymorphonuclear neutrophils in vitro
1Department of Thoracic Medicine, National Heart and Lung Institute, University of London, United Kingdom.
European Journal of Cell Biology
|April 1, 1991
Summary
Polymorphonuclear neutrophils (PMN) adhesion to fibroblasts is mediated by Mac-1 integrins and cytokine-induced pathways. Fibroblast extracellular matrix components do not significantly influence this interaction, highlighting distinct adhesion mechanisms.
Area of Science:
- Cell Biology
- Immunology
- Biochemistry
Background:
- The interaction between polymorphonuclear neutrophils (PMN) and fibroblasts is crucial in inflammatory responses but remains poorly understood.
- Investigating PMN-fibroblast interactions can elucidate mechanisms of tissue repair and inflammation.
Purpose of the Study:
- To investigate the adherence mechanisms of PMN to human fetal lung fibroblasts.
- To identify the molecular players and pathways involved in PMN-fibroblast adhesion.
Main Methods:
- Utilized a microtiter plate assay measuring Rose Bengal dye uptake to quantify PMN adherence to fibroblast monolayers.
- Employed phorbol myristate acetate (PMA) for PMN stimulation and assessed the role of Mac-1 integrins using specific monoclonal antibodies (anti-CD18, anti-CD11b).
- Investigated the effect of fibroblast prestimulation with cytokines (IL-1α, TNF-α, TGF-β) and extracellular matrix components (fibronectin, collagen) on PMN adhesion.
Main Results:
- PMA stimulation significantly increased PMN adherence within 5 minutes, indicating a rapid response.
- PMN adherence was highly dependent on the Mac-1 integrin (CD11b/CD18), with antibodies inhibiting adhesion by 88% and 77%.
- Fibroblast prestimulation with IL-1α and TNF-α (but not TGF-β) enhanced unstimulated PMN adhesion, demonstrating fibroblast-dependent pathways. Extracellular matrix components did not affect adhesion.
Conclusions:
- PMN adherence to fibroblasts involves both PMN-dependent (Mac-1) and fibroblast-dependent (cytokine-mediated) pathways.
- The findings highlight the complex interplay between immune cells and structural cells in inflammatory processes.
- Extracellular matrix proteins of fibroblasts are not primary mediators of PMN adhesion in this model.