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1 Dept of Otorhinolaryngology, Karlsruhe Teaching Hospital, University of Freiburg, Karlsruhe, 2 Division of Allergy Research, Dept of Pediatric Pneumology and Immunology, Charité, Humboldt-University, Berlin, 3 Dept of Otorhinolaryngology, School of Medicine, University of Hannover, Hannover, 4 Dept of Medicine, Charité Campus Mitte, Humboldt-University, Berlin, Germany
CORRESPONDENCE: A. Fischer, Division of Allergy Research, Dept of Pediatric Pneumology and Immunology, Charité Campus Virchow, Biomedical Research Center OR-3, Augustenburger Platz 1, D-13353, Berlin, Germany. Fax: 49 30450559951. E-mail: axel.fischer@charite.de
Keywords: aspirin, neuropeptides, rhinitis
Received: September 17, 2002
Accepted June 22, 2003
This study was supported by German Research Community and Federal Ministry for Education and Research (01 GC 0002) grants.
Aspirin-sensitive rhinitis is the manifestation of aspirin intolerance in the upper respiratory tract. The disease represents a pseudoallergy against aspirin or related nonsteroidal anti-inflammatory drugs. As a major immunomodulatory role for airway innervation has been proposed in airway inflammatory diseases, the present study assessed changes in human nasal mucosa innervation in patients with aspirin-sensitive rhinitis in comparison to a control group.
Immunohistochemistry for protein gene product 9.5, tachykinins, calcitonin gene-related peptide, vasoactive intestinal peptide (VIP) and neuropeptide tyrosine was performed on cryostats sections of nasal mucosa and neuropeptide containing nerves were examined independently using a score grading.
In comparison to the control, the aspirin-sensitive rhinitis group had a significant increase of VIP-like immunoreactivity in mucosal nerve fibres. In contrast to constant numbers of mast cells, highly significant increases in the numbers of eosinophils were found in the group of aspirin-sensitive rhinitis patients.
In summary, the present quantification of neuropeptide-immunoreactivity of mucosal nerves demonstrated differences in the human nasal mucosa innervation between nonrhinitic and aspirin-sensitive rhinitic individuals. These differences may reflect a pathophysiological role of upper airway innervation in pseudoallergic reactions.
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