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Structural emphysema does not correlate with lung compliance: lessons from the mouse smoking model
Robert F Foronjy1, Becky A Mercer, Mark W Maxfield
1Department of Medicine, Division of Molecular Medicine and Pulmonary Medicine, Columbia University, New York, USA.
Experimental Lung Research
|July 16, 2005
Summary
Chronic cigarette smoke exposure caused emphysema in mice but did not affect lung compliance. This suggests structural emphysema and loss of elastic recoil may involve different mechanisms.
Area of Science:
- Pulmonary Medicine
- Toxicology
- Respiratory Physiology
Background:
- Cigarette smoke exposure is a primary cause of emphysema.
- Emphysema involves structural lung damage and altered respiratory mechanics.
- The relationship between emphysema's structural changes and functional deficits like reduced lung compliance is not fully understood.
Purpose of the Study:
- To investigate the correlation between smoke-induced histologic emphysema and changes in lung compliance in mice.
- To determine if structural emphysema develops independently of functional changes in lung mechanics.
Main Methods:
- Two strains of mice (CBA/J/J x C57BL/6J and A/J) were exposed to chronic cigarette smoke.
- Lung morphometry was used to quantify emphysema.
- Lung compliance was measured to assess respiratory mechanics.
Main Results:
- Chronic smoke exposure induced significant emphysema in A/J mice.
- Emphysema development in A/J mice occurred without significant changes in lung compliance, lung matrix composition, or apoptosis.
- No correlation was found between the degree of emphysema (by morphometry) and pulmonary compliance.
Conclusions:
- Histologic emphysema induced by cigarette smoke in this model can occur independently of changes in lung compliance.
- The mechanisms driving structural lung damage in emphysema may differ from those causing loss of elastic recoil and altered lung function.