[Primary nasal epithelial cells and fibroblasts have inflammation-inducing functions].
BACKGROUND
The appearance of neutrophils in rhinitis and sinusitis led to the working hypothesis that neutrophil-specific attractants commonly called chemokines are generated by stimulation with proinflammatory cytokines and bacteria. The receptor mechanism of chemokine synthesis by bacterial products is under discussion and still has to be elucidated.


METHODS
The primary nasal cultures of epithelial cells and fibroblasts ( n=4) were incubated with TNF-alpha (tumor necrosis factor) for 24 and 72 h. Bacterial stimulation of the cell cultures was performed by adding supernatants from the mucoid phenotype of Pseudomonas aeruginosa (PA01) in dilution 1:5 for 24 and 72 h. Supernatants were collected and the concentration of the chemokines interleukin-8 (IL-8), GRO-alpha (growth-related oncogene-alpha), and ENA-78 (epithelial neutrophil-activating peptide) were determined by ELISA technique. Our results revealed that the protein concentration of the chemokines GRO-alpha and IL-8 was upregulated by TNF-alpha as well as by bacterial supernatants in epithelial cells.


CONCLUSIONS
We conclude that GRO-alpha and IL-8 were inducible by bacterial supernatants in nasal epithelial cells and fibroblasts.
Rudack
C
C
HNO-Klinik, Universitätsklinikum Münster. rudack@uni-muenster.de
Stoll
W
W
Hermann
W
W
D054360:Chemokine CXCL1; D054365:Chemokine CXCL5; D018925:Chemokines / Q000378:metabolism*; D019743:Chemokines, CXC / Q000378:metabolism; D046508:Culture Techniques; D004847:Epithelial Cells / Q000187:drug effects / Q000276:immunology*; D005347:Fibroblasts / Q000187:drug effects / Q000276:immunology*; D006801:Humans; D007114:Immunization; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism; D016209:Interleukin-8 / Q000031:analogs & derivatives* / Q000378:metabolism; D009297:Nasal Mucosa / Q000187:drug effects / Q000276:immunology*; D018375:Neutrophil Activation / Q000187:drug effects / Q000276:immunology; D011550:Pseudomonas aeruginosa / Q000276:immunology*; D013268:Stimulation, Chemical; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology; D015854:Up-Regulation / Q000187:drug effects / Q000276:immunology
C475829:CXCL1 protein, human; C486263:CXCL5 protein, human; D054360:Chemokine CXCL1; D054365:Chemokine CXCL5; D018925:Chemokines; D019743:Chemokines, CXC; D036341:Intercellular Signaling Peptides and Proteins; D016209:Interleukin-8; D014409:Tumor Necrosis Factor-alpha