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Developmental changes in airway and tissue mechanics in mice
Elizabeth M Bozanich1, Rachel A Collins, Cindy Thamrin
1Division of Clinical Sciences, Telethon Institute for Child Health Research and Centre for Child Health Research, University of Western Australia, Perth, Australia. lizb@ichr.uwa.edu.au
Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 9, 2005
Summary
Lung function in young mice changes significantly with age, with airway resistance and tissue mechanics maturing from infancy to adulthood. These respiratory changes mirror lung development in BALB/c mice.
Area of Science:
- Pulmonary Physiology
- Comparative Medicine
- Respiratory Mechanics
Background:
- Limited data exists on lung function development in juvenile animal models.
- Understanding early-life respiratory changes is crucial for modeling human lung diseases.
Purpose of the Study:
- To characterize lung function development in BALB/c mice from 2 to 8 weeks of age.
- To assess age-related changes in airway resistance, tissue damping, and elastance.
Main Methods:
- Utilized low-frequency forced oscillation technique to measure respiratory system impedance.
- Partitioned impedance into airway resistance, tissue damping, tissue elastance, and hysteresivity.
- Performed measurements at end-expiratory pause and during relaxed expiration.
Main Results:
- Airway resistance significantly decreased with age (P < 0.001).
- Tissue damping and elastance decreased from 2 to 5 weeks, then plateaued.
- Hysteresivity showed no age-related changes at end-expiratory pause, but volume dependence varied with age.
Conclusions:
- Murine lung function undergoes significant maturation from infancy to adulthood.
- Observed changes in respiratory mechanics correlate with known structural lung development.
- This study provides a baseline for investigating early-life lung disease models in mice.