Cytokine secretion by cystic fibrosis airway epithelial cells.

Abstract:

:It is controversial whether mutations in cystic fibrosis transmembrane conductance regulator intrinsically dysregulate inflammation. We characterized passage 2 human tracheobronchial epithelial cell cultures morphologically and physiologically and determined whether cytokine production or nuclear factor-kappaB activation was systematically altered in cystic fibrosis (CF) cells. Non-CF and CF cells originating from a total of 33 and 25 lungs, respectively, were available for culture on plastic or at an air-liquid interface until well differentiated. Forskolin-stimulated short-circuit currents were present in representative polarized non-CF cultures and were absent in CF cultures, whereas uridine 5'-triphosphate-stimulated currents were present in both. Constitutive or interleukin (IL)-1beta-induced IL-8 or IL-6 secretion or nuclear factor-kappaB activity was not significantly different between non-CF and CF cells. The cytokines regulated upon activation, normal T cell expressed and secreted (RANTES) and IL-10 were not detectable. Stimulation with tumor necrosis factor-alpha or a synthetic toll-like receptor 2 agonist or variable doses and times of Staphylococcus aureus culture filtrate revealed a single dose- and time-dependent difference in IL-8 production by CF cells. Interestingly, although IL-8 secretion after stimulation with Pseudomonas aeruginosa filtrates was not greater in CF cells in the absence of human serum, it was variably greater in its presence. Thus, although exaggerated responses may develop under certain conditions, our results do not support an overall intrinsically hyperinflammatory phenotype in CF cells.

authors

Becker MN,Sauer MS,Muhlebach MS,Hirsh AJ,Wu Q,Verghese MW,Randell SH

doi

10.1164/rccm.200207-765OC

keywords:

subject

Has Abstract

pub_date

2004-03-01 00:00:00

pages

645-53

issue

5

eissn

1073-449X

issn

1535-4970

pii

200207-765OC

journal_volume

169

pub_type

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