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Acetaldehyde-mediated cilia dysfunction in bovine bronchial epithelial cells
J H Sisson1, D J Tuma, S I Rennard
1Department of Medicine, University of Nebraska Medical Center, Omaha 68105-1065.
The American Journal of Physiology
|February 1, 1991
Summary
Acetaldehyde in cigarette smoke and alcohol impairs lung cilia motion by inhibiting key protein function. This study shows acetaldehyde directly damages cilia, affecting airway defense mechanisms.
Area of Science:
- Biochemistry
- Cell Biology
- Pulmonary Medicine
Background:
- Acetaldehyde is present in cigarette smoke and elevated during alcohol consumption.
- Acetaldehyde is known to impair protein function via adduct formation.
- Impaired mucociliary clearance is a consequence of acetaldehyde exposure.
Purpose of the Study:
- To investigate the hypothesis that acetaldehyde impairs bronchial epithelial cilia motion.
- To determine if acetaldehyde inhibits cilia dynein adenosinetriphosphatase (ATPase) activity.
- To explore the formation of acetaldehyde-protein adducts with cilia proteins.
Main Methods:
- Primary cultures and isolated axonemes of bovine airway epithelial cells were used.
- Cilia beating and dynein ATPase activity were measured after acetaldehyde exposure.
- Acetaldehyde binding to cilia proteins was assessed using [14C] acetaldehyde and gel electrophoresis.
Main Results:
- Acetaldehyde caused concentration- and time-dependent slowing of cilia beating.
- Acetaldehyde inhibited cilia-derived dynein ATPase activity.
- Acetaldehyde bound to dynein heavy chains and tubulin, correlating with ATPase inhibition.
Conclusions:
- Acetaldehyde directly impairs bronchial cilia function by slowing cilia beating.
- Acetaldehyde inhibits cilia dynein ATPase activity.
- Acetaldehyde adduct formation with dynein and tubulin contributes to cilia dysfunction, potentially impairing airway host defenses.