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Subcellular distribution of disaturated phosphatidylcholine in developing rabbit lung
1Department of Obstetrics and Gynecology, Dalhousie University, Halifax, Nova Scotia, Canada.
Lipids
|January 1, 1988
Summary
Disaturated phosphatidylcholine (DSPC) in rabbit lungs increases significantly during fetal development, primarily accumulating in lamellar bodies by term. Postnatal increases are seen in microsomes and cytosol.
Area of Science:
- Biochemistry
- Developmental Biology
- Pulmonary Medicine
Background:
- Disaturated phosphatidylcholine (DSPC) is a crucial component of pulmonary surfactant.
- Understanding its subcellular distribution during lung development is vital for respiratory health.
Purpose of the Study:
- To investigate the subcellular localization and changes in DSPC within rabbit lung tissue during perinatal development.
- To quantify DSPC levels in various subcellular fractions, including lamellar bodies, from fetal to postnatal stages.
Main Methods:
- Fetal and newborn rabbits at various gestational ages were studied.
- Lung tissue homogenates were fractionated into nuclei-cellular debris, mitochondria, microsomes, lamellar bodies (surfactant), and cytosol.
- DSPC content in each fraction was quantified.
Main Results:
- Total lung tissue DSPC significantly increased from 24 days gestation to term.
- Early increases (24-26 days) were in mitochondrial, microsomal, and cytosolic pools.
- Lamellar body DSPC showed a substantial six-fold increase between 26-28 days gestation and a further seven-fold by term.
- Postnatally, microsomal and cytosolic DSPC doubled, while lamellar body DSPC remained stable.
Conclusions:
- Lamellar bodies become the primary repository for DSPC in late fetal lung development.
- Dynamic shifts in DSPC distribution occur across subcellular fractions during lung maturation.
- These findings provide insights into surfactant biogenesis and pulmonary adaptation at birth.