Related Experiment Video
Updated: Jun 17, 2026
14:16
Analysis of Physiologic E-Selectin-Mediated Leukocyte Rolling on Microvascular Endothelium
Published on: February 11, 2009
Endothelial L-selectin ligand expression in nasal polyps
Fenna A Ebbens1, S K Toppila-Salmi, J A Renkonen
1Department of Otorhinolaryngology, Academic Medical Center, Amsterdam, The Netherlands.
Allergy
|January 19, 2010
Summary
Functionally active L-selectin ligands are involved in leukocyte recruitment in simple and cystic fibrosis nasal polyps (NP), but not antro-choanal polyps (ACP). This study investigated ligand expression in different NP types and controls.
Area of Science:
- Immunology
- Rhinology
- Cell Biology
Background:
- L-selectins and their endothelial counter-receptors mediate leukocyte recruitment in chronic rhinosinusitis without nasal polyps (NP).
- Understanding these interactions is crucial for developing targeted therapies for NP.
Purpose of the Study:
- To assess the expression of active endothelial L-selectin ligands in nasal polyps (NP) from patients with varying etiologies (simple NP, antro-choanal polyps [ACP], cystic fibrosis [CF] NP).
- To compare these expression levels with leukocyte subsets in NP and healthy inferior turbinate controls.
Main Methods:
- Immunohistochemical staining of nasal polyp and healthy mucosa specimens.
- Use of monoclonal antibodies to detect CD34, sulfated sialyl Lewis x (sLe(x)) epitopes, and leukocyte subsets.
Main Results:
- All NP types showed a reduction in CD34+ vessels.
- Simple NP and CF NP exhibited increased eosinophils and upregulated endothelial sulfated sLe(x) expression.
- ACP were characterized by low eosinophil counts and minimal endothelial sulfated sLe(x) expression.
Conclusions:
- Functionally active L-selectin ligands appear to guide leukocyte traffic in simple NP and CF NP.
- This mechanism is likely not involved in antro-choanal polyps (ACP).
- Findings suggest distinct pathways for leukocyte recruitment in different NP subtypes.
