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Eosinophil adhesion regulates RANTES production in nasal epithelial cells
N Terada1, K Maesako, N Hamano
1Department of Otorhinolaryngology, Chiba University School of Medicine, Chiba City, Japan.
Journal of Immunology (Baltimore, Md. : 1950)
|June 1, 1997
Summary
Eosinophil adhesion to human nasal epithelial cells (HNECs) reduces the production of RANTES, a key chemokine. This interaction decreases eosinophil infiltration, suggesting a regulatory mechanism in allergic rhinitis.
Area of Science:
- Immunology
- Cell Biology
- Respiratory Medicine
Background:
- RANTES is a critical chemokine for eosinophil chemotaxis.
- Eosinophil migration into tissues involves adhesion molecules and cell-to-cell communication.
- Understanding eosinophil-epithelial cell interactions is vital in allergic diseases.
Purpose of the Study:
- To investigate the effect of eosinophil adhesion to human nasal epithelial cells (HNECs) on RANTES production.
- To elucidate the role of eosinophil-epithelial cell signaling in regulating RANTES and eosinophil infiltration.
Main Methods:
- Eosinophils were isolated from allergic rhinitis patients.
- Human nasal epithelial cells (HNECs) and microvascular endothelial cells were cultured.
- RANTES production and mRNA expression were measured after co-culture and stimulation with TNF-alpha and IFN-gamma.
Main Results:
- Eosinophil adhesion to HNECs significantly inhibited TNF-alpha and IFN-gamma-induced RANTES production.
- The inhibition of RANTES production was dependent on the number of adhered eosinophils.
- Eosinophils did not affect RANTES production by endothelial cells.
- Blocking eosinophil CD18 or using Transwell inserts abolished the inhibitory effect on RANTES production.
Conclusions:
- Eosinophil adhesion to HNECs is a key mechanism for inhibiting RANTES production.
- A signaling pathway exists for eosinophils to suppress RANTES release from HNECs.
- This interaction contributes to the downregulation of eosinophil infiltration in the nasal cavity.