The Relationship of Mucus Concentration (Hydration) to Mucus Osmotic Pressure and Transport in Chronic Bronchitis.

Abstract:

RATIONALE:Chronic bronchitis (CB) is characterized by persistent cough and sputum production. Studies were performed to test whether mucus hyperconcentration and increased partial osmotic pressure, in part caused by abnormal purine nucleotide regulation of ion transport, contribute to the pathogenesis of CB. OBJECTIVES:We tested the hypothesis that CB is characterized by mucus hyperconcentration, increased mucus partial osmotic pressures, and reduced mucus clearance. METHODS:We measured in subjects with CB as compared with normal and asymptomatic smoking control subjects indices of mucus concentration (hydration; i.e., percentage solids) and sputum adenine nucleotide/nucleoside concentrations. In addition, sputum partial osmotic pressures and mucus transport rates were measured in subjects with CB. MEASUREMENTS AND RESULTS:CB secretions were hyperconcentrated as indexed by an increase in percentage solids and total mucins, in part reflecting decreased extracellular nucleotide/nucleoside concentrations. CB mucus generated concentration-dependent increases in partial osmotic pressures into ranges predicted to reduce mucus transport. Mucociliary clearance (MCC) in subjects with CB was negatively correlated with mucus concentration (percentage solids). As a test of relationships between mucus concentration and disease, mucus concentrations and MCC were compared with FEV1, and both were significantly correlated. CONCLUSIONS:Abnormal regulation of airway surface hydration may slow MCC in CB and contribute to disease pathogenesis.

authors

Anderson WH,Coakley RD,Button B,Henderson AG,Zeman KL,Alexis NE,Peden DB,Lazarowski ER,Davis CW,Bailey S,Fuller F,Almond M,Qaqish B,Bordonali E,Rubinstein M,Bennett WD,Kesimer M,Boucher RC

doi

10.1164/rccm.201412-2230OC

subject

Has Abstract

pub_date

2015-07-15 00:00:00

pages

182-90

issue

2

eissn

1073-449X

issn

1535-4970

journal_volume

192

pub_type

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