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Intranasal steroids decrease eosinophils but not mucin expression in nasal polyps.

P-R Burgel1, L O Cardell, I F Ueki

  • 1Cardiovascular Research Institute, Box 0130, University of California San Francisco, San Francisco, CA 94 143-0130, USA.

The European Respiratory Journal
|October 2, 2004
PubMed
Summary
This summary is machine-generated.

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Intranasal fluticasone reduced nasal resistance and eosinophils in nasal polyps but did not affect mucin (MUC5AC) expression, epidermal growth factor receptor (EGFR), or inflammatory markers like IL-8 and TNF-alpha.

Area of Science:

  • Otorhinolaryngology
  • Immunology
  • Molecular Biology

Background:

  • Increased mucin expression is characteristic of nasal polyposis.
  • Corticosteroids are used to treat nasal polyps, but their impact on mucin production is not well understood.

Purpose of the Study:

  • To investigate the effects of intranasal fluticasone on MUC5AC mucin expression, nasal resistance, and inflammatory markers in nasal polyps.

Main Methods:

  • Nasal polyps from nine subjects were analyzed before and after 8 weeks of intranasal fluticasone treatment.
  • In situ hybridization and immunohistochemical staining were used to assess MUC5AC, epidermal growth factor receptor (EGFR), interleukin (IL)-8, and tumor necrosis factor (TNF)-alpha expression.
  • Morphometric analysis evaluated changes in epithelial and stained areas, cell counts, and inflammatory markers.

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Main Results:

  • Fluticasone treatment decreased nasal resistance and intraepithelial eosinophils.
  • No significant changes were observed in MUC5AC expression (both protein and mRNA), EGFR expression, neutrophil infiltration, IL-8, or TNF-alpha levels.

Conclusions:

  • Intranasal fluticasone effectively reduces nasal airflow resistance and eosinophil infiltration in nasal polyps.
  • Fluticasone does not appear to alter mucin production, EGFR expression, or key inflammatory mediators in this context.