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Topical steroids do not downregulate expression of growth-related oncogene-alpha in nasal polyps

Lars-Olaf Cardell1, Jesper Bogefors, Anders Bjartell

  • 1Department of Otorhinolaryngology, Lund University, Malmö University Hospital, Malmö, Sweden. Lars-Olaf.Cardell@med.lu.se

Acta Oto-Laryngologica
|April 13, 2006
PubMed
Abstract

Insights

Topical steroids did not alter growth-related oncogene-alpha (GRO-alpha) levels in nasal polyps. This suggests steroid-resistant gene expression may contribute to nasal polyp development, necessitating new treatments.

Area of Science:

  • Otolaryngology
  • Immunology
  • Molecular Biology

Background:

  • Nasal polyps involve inflammatory cell infiltration.
  • Growth-related oncogene-alpha (GRO-alpha), a neutrophil-recruiting chemokine, is elevated in nasal polyps.
  • GRO-alpha exhibits growth-stimulatory and angiogenetic properties.

Purpose of the Study:

  • To evaluate GRO-alpha presence and expression in nasal polyps.
  • To determine the effect of glucocorticoid treatment on GRO-alpha levels.

Main Methods:

  • Nasal polyps were collected before and after 6 weeks of topical fluticasone treatment.
  • GRO-alpha gene expression and peptide presence were analyzed using in situ hybridization, qRT-PCR, and immunohistochemistry.

Main Results:

  • Significant GRO-alpha gene expression and peptide presence were observed in polyp epithelium and inflammatory cells.
  • No significant difference in GRO-alpha gene expression was found between untreated and steroid-treated nasal polyps.

Conclusions:

  • Topical steroids do not impact GRO-alpha expression in nasal polyps.
  • Steroid-resistant gene expression may play a role in nasal polyp pathogenesis.
  • Further pharmacological strategies are needed for nasal polyp treatment.

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