Abstract
Chronic respiratory infections in cystic fibrosis result from CFTR channel mutations but how these impair antibacterial defense is less clear. Airway host defense depends on lactoperoxidase (LPO) that requires thiocyanate (SCN-) to function and epithelia use CFTR to concentrate SCN- at the apical surface. To test whether CFTR mutations result in impaired LPO-mediated host defense, CF epithelial SCN- transport was measured. CF epithelia had significantly lower transport rates and did not accumulate SCN- in the apical compartment. The lower CF [SCN-] did not support LPO antibacterial activity. Modeling of airway LPO activity suggested that reduced transport impairs LPO-mediated defense and cannot be compensated by LPO or H2O2 upregulation.
Original language | English (US) |
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Pages (from-to) | 271-278 |
Number of pages | 8 |
Journal | FEBS letters |
Volume | 581 |
Issue number | 2 |
DOIs | |
State | Published - Jan 23 2007 |
Keywords
- CFTR
- Cystic fibrosis
- Host defense
- Hydrogen peroxide
- Lactoperoxidase
- Thiocyanate
ASJC Scopus subject areas
- Biochemistry
- Biophysics
- Molecular Biology