Related Experiment Videos
Interleukin-8 mediates interleukin-1 alpha-induced neutrophil transcellular migration
1Department of Internal Medicine, VA Medical Center, Iowa City, Iowa, USA.
American Journal of Respiratory Cell and Molecular Biology
|September 1, 1995
Summary
Interleukin-1 alpha (IL-1 alpha) stimulates neutrophil migration through lung cells, suggesting it plays a role in inflammatory lung diseases by releasing factors like IL-8.
Area of Science:
- Immunology
- Cell Biology
- Pulmonary Medicine
Background:
- Interleukin-1 alpha (IL-1 alpha) is a key proinflammatory cytokine.
- Neutrophils are critical immune cells in allergic and inflammatory lung conditions.
Purpose of the Study:
- To investigate the impact of IL-1 alpha on human neutrophil migration across endothelial and epithelial cell layers.
- To explore the mechanisms behind IL-1 alpha-induced neutrophil transmigration.
Main Methods:
- Human neutrophils were migrated across naked filters, human umbilical vein endothelial (HUVE) cell monolayers, and A549 pulmonary epithelial cell monolayers.
- Cells were exposed to varying concentrations of IL-1 alpha.
- Supernatants from stimulated cells were analyzed for chemotactic factors, and the role of IL-8 was assessed using anti-IL-8 antibodies.
Main Results:
- IL-1 alpha induced dose- and time-dependent neutrophil migration through both HUVE and A549 monolayers, but not naked filters.
- Neutrophil migration was greater through A549 cells than HUVE cells.
- Supernatants from IL-1 alpha-stimulated cells enhanced neutrophil migration, indicating the release of secondary chemotactic factors, including IL-8.
Conclusions:
- IL-1 alpha promotes neutrophil migration across pulmonary epithelial and endothelial barriers.
- This effect is mediated, in part, by the release of soluble factors like IL-8.
- IL-1 alpha contributes to neutrophil recruitment in inflammatory lung diseases.