Dysregulated interleukin-8 secretion and NF-kappaB activity in human cystic fibrosis nasal epithelial cells.
J Cyst Fibros
; 5(2): 113-9, 2006 May.
Article
em En
| MEDLINE
| ID: mdl-16481223
ABSTRACT
BACKGROUND:
It is not clear whether cystic fibrosis (CF) airway inflammation is a consequence of bacterial infection or is intrinsically dysregulated. The aim of this study was to investigate IL-8 secretion and NF-kappaB activity in primary respiratory epithelial cells cultured from nasal polyps obtained from CF and non-CF subjects.METHODS:
NF-kappaB activity was studied by electrophoretic mobility-shift and quantitative colorimetric assays in nuclear extracts. Immunoreactive IL-8 levels were assessed by ELISA in cell culture supernatants. Both parameters were studied at baseline and following challenge with Pseudomonas aeruginosa or stimulation with pro-inflammatory cytokines.RESULTS:
Under basal conditions, CF cells presented a significant higher activity of NF-kappaB than non-CF cells (P=0.0004). P. aeruginosa challenge and IL-1beta/H2O2 co-stimulation caused four and two fold induction of NF-kappaB activity in non-CF and CF cells, respectively. IL-8 levels in unstimulated CF cells were significantly higher than in non-CF cells (P=0.0025). Upon incubation with P. aeruginosa and IL-1beta/H2O2, non-CF cells produced 6.3 times more IL-8 than unstimulated cells, whereas IL-8 secretion increased only of 1.4 times in CF cells.CONCLUSIONS:
CF respiratory epithelial cells exhibit a basal dysregulated production of IL-8 that partially correlates to enhanced NF-kappaB activity. Our data corroborate the hypothesis of a basal exaggerated inflammatory response in the CF respiratory epithelium.
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Base de dados:
MEDLINE
Assunto principal:
Interleucina-8
/
NF-kappa B
/
Fibrose Cística
/
Mucosa Nasal
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article