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Morphological alterations affecting the microvasculature in nasal allergy
The Annals of Otology, Rhinology, and Laryngology
|January 1, 1983
Summary
Human nasal blood vessels show early-stage congestion and swelling after allergen exposure. Later stages reveal dilated vessels and eosinophils, suggesting complex mechanisms in allergic rhinitis.
Area of Science:
- Allergy and immunology
- Vascular biology
- Nasal pathophysiology
Background:
- Allergic rhinitis involves nasal inflammation and edema.
- The precise microvascular changes in human nasal mucosa during allergic reactions are not fully understood.
Purpose of the Study:
- To investigate the fine structural changes in human nasal blood vessels following allergen provocation.
- To elucidate the role of vascular endothelial cells and inflammatory cells in allergic nasal responses.
Main Methods:
- Human nasal biopsies were obtained from 15 allergic patients at 2 and 20 minutes post-allergen provocation.
- Transmission electron microscopy was used to examine the ultrastructure of capillaries and venules.
Main Results:
- Early stage (2 min): Congestion, endothelial cell swelling, and interendothelial gaps in capillaries and venules, indicating increased vascular permeability and edema.
- Late stage (20 min): Congestion resolved, but vascular dilatation and prominent interendothelial gaps persisted.
- Degranulated eosinophils were observed in perivascular and intravascular spaces in both stages.
Conclusions:
- Allergen provocation induces rapid microvascular changes in the nasal mucosa, including increased permeability and edema.
- Eosinophils and their granular contents, beyond histamine, may contribute significantly to vascular permeability in allergic rhinitis.