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Oxidation increases mucin polymer cross-links to stiffen airway mucus gels.

Abstract：

:Airway mucus in cystic fibrosis (CF) is highly elastic, but the mechanism behind this pathology is unclear. We hypothesized that the biophysical properties of CF mucus are altered because of neutrophilic oxidative stress. Using confocal imaging, rheology, and biochemical measures of inflammation and oxidation, we found that CF airway mucus gels have a molecular architecture characterized by a core of mucin covered by a web of DNA and a rheological profile characterized by high elasticity that can be normalized by chemical reduction. We also found that high levels of reactive oxygen species in CF mucus correlated positively and significantly with high concentrations of the oxidized products of cysteine (disulfide cross-links). To directly determine whether oxidation can cross-link mucins to increase mucus elasticity, we exposed induced sputum from healthy subjects to oxidizing stimuli and found a marked and thiol-dependent increase in sputum elasticity. Targeting mucin disulfide cross-links using current thiol-amino structures such as N-acetylcysteine (NAC) requires high drug concentrations to have mucolytic effects. We therefore synthesized a thiol-carbohydrate structure (methyl 6-thio-6-deoxy-α-D-galactopyranoside) and found that it had stronger reducing activity than NAC and more potent and fast-acting mucolytic activity in CF sputum. Thus, oxidation arising from airway inflammation or environmental exposure contributes to pathologic mucus gel formation in the lung, which suggests that it can be targeted by thiol-modified carbohydrates.

journal_name

Sci Transl Med

journal_title

Science translational medicine

authors

Yuan S,Hollinger M,Lachowicz-Scroggins ME,Kerr SC,Dunican EM,Daniel BM,Ghosh S,Erzurum SC,Willard B,Hazen SL,Huang X,Carrington SD,Oscarson S,Fahy JV

doi

10.1126/scitranslmed.3010525

subject

Has Abstract

pub_date

2015-02-25 00:00:00

pages

276ra27

issue

276

eissn

1946-6234

issn

1946-6242

pii

7/276/276ra27

journal_volume

7

pub_type

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