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Department of Pediatrics, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106
A tendency
toward excessive inflammation in cystic fibrosis (CF) patients often
accompanies lung infections with Pseudomonas aeruginosa. We
tested the cytokine response to P. aeruginosa in two pairs
of human airway epithelial cell lines matched except for CF
transmembrane conductance regulator activity. The 9/HTEo
CF-phenotypic cell line produced significantly more interleukin (IL)-8,
IL-6, and granulocyte-macrophage colony-stimulating factor but not
regulated on activation normal T cell expressed and secreted (RANTES)
in response to Pseudomonas than the 9/HTEo
control line, and the differences widened over time. Similarly, a 16HBE
cell line lacking transmembrane conductance regulator activity showed
enhanced IL-8 and IL-6 responses compared with the control cell line.
The pharmacology of the cytokine response also differed because
dexamethasone reduced cytokine production to similar levels in the
matched cell lines. The protracted proinflammatory cytokine response of
the CF-phenotypic cell lines suggests that the limiting mechanisms of
normal cells are absent or attenuated. These results are consistent
with in vivo observations in patients with CF and suggest that our
novel cell lines may be useful for further investigation of the
proinflammatory responses in CF airways.
cystic fibrosis; interleukin-8; interleukin-6; granulocyte-macrophage colony-stimulating factor; inflammation
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