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Developmental changes in lung epithelial ion transport and liquid movement
1Department of Pediatrics, University of Utah School of Medicine, Salt Lake City 84132.
Annual Review of Physiology
|January 1, 1992
Summary
Fetal lungs secrete chloride (Cl-) to fill with liquid. Post-birth, the lung epithelium switches to sodium (Na+) absorption, rapidly clearing lung liquid via Na+-K+-ATPase activity.
Area of Science:
- Pulmonary Physiology
- Epithelial Transport
- Neonatal Adaptation
Background:
- Fetal lungs are filled with liquid secreted by epithelial cells.
- This liquid flow is driven by chloride (Cl-) secretion.
- The mechanism for liquid clearance at birth is critical for respiratory adaptation.
Purpose of the Study:
- To investigate the transition of lung liquid balance from fetal to neonatal life.
- To elucidate the role of epithelial ion transport in lung liquid regulation.
- To understand the mechanisms of rapid lung liquid clearance at birth.
Main Methods:
- Analysis of epithelial ion transport mechanisms in fetal and neonatal lung models.
- Investigation of hormonal influences on epithelial cell function.
- Assessment of Na+-K+-ATPase activity in lung epithelial cells.
Main Results:
- Lung liquid secretion decreases as birth approaches, linked to hormonal changes.
- Pulmonary epithelium shifts from Cl- secretion to Na+ absorption post-birth.
- Increased Na+-K+-ATPase activity drives rapid lung liquid removal into the interstitium and circulation.
Conclusions:
- The switch in epithelial ion transport is crucial for neonatal lung liquid clearance.
- Na+-K+-ATPase-dependent absorption is a key mechanism for adapting to air breathing.
- This process is vital for preventing alveolar edema in mature lungs and in conditions like heart failure.