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[hBD-2 gene expression in nasal mucosa].
J E Meyer1, J Harder, T Görögh
1Klinik für Hals-, Nasen-, Ohrenheilkunde, Kopf- und Halschirurgie, Christian-Albrechts-Universität zu Kiel.
Laryngo- Rhino- Otologie
|September 27, 2000
Summary
Human Beta-Defensin-2 (hBD-2) gene expression is induced by Pseudomonas aeruginosa in nasal epithelial cells, suggesting a role in antimicrobial defense. Lower hBD-2 expression in nasal polyps may contribute to persistent infections.
Area of Science:
- Immunology
- Microbiology
- Otolaryngology
Background:
- Chronic sinusitis involves complex inflammation, often exacerbated by recurrent bacterial infections like Pseudomonas aeruginosa (PA).
- PA is frequently detected in patients with persistent sinus issues post-surgery.
- Human Beta-Defensin-2 (hBD-2), an antimicrobial peptide, shows efficacy against PA.
Purpose of the Study:
- To investigate hBD-2 mRNA expression in nasal cells and tissues.
- To determine the effect of PA on hBD-2 expression in the nasal mucosa.
Main Methods:
- RNA extraction from nasal polyps and turbinates.
- Isolation and cultivation of human nasal epithelial cells and fibroblasts.
- Stimulation of cells with PA and subsequent Semi-quantitative Reverse Transcriptase PCR (SQRT-PCR) for hBD-2 mRNA.
Main Results:
- PA induced hBD-2 gene expression in nasal epithelial cells in a time- and dose-dependent manner.
- Constitutive hBD-2 mRNA expression was observed in unstimulated epithelial cells, but not in fibroblasts.
- Nasal polyps exhibited lower hBD-2 gene expression compared to nasal turbinates.
Conclusions:
- hBD-2 may function as an early antimicrobial defense mechanism in the nasal mucosa.
- Diminished hBD-2 gene expression could potentially explain persistent PA infections in chronic sinusitis.