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Fatty acid biosynthesis in developing fetal lung.

¹Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut 06510.

The American Journal of Physiology

|October 1, 1989

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The fetal lung synthesizes fatty acids de novo, crucial for phosphatidylcholine production in pulmonary surfactant. Glucocorticoids enhance this process, stimulating fatty acid synthesis and enzyme activity for fetal lung maturation.

Area of Science:

Biochemistry
Developmental Biology
Pulmonary Medicine

Background:

Fatty acids are essential components of glycerolipids and pulmonary surfactant.
The fetal lung possesses the capability for de novo fatty acid synthesis.
Pulmonary surfactant, rich in phosphatidylcholine, is vital for lung function after birth.

Purpose of the Study:

To investigate the role of de novo fatty acid biosynthesis in fetal lung development.
To examine the influence of glucocorticoids on fatty acid synthesis and surfactant production.
To understand the regulatory mechanisms of phosphatidylcholine biosynthesis in the fetal lung.

Main Methods:

Analysis of fatty acid synthesis pathways in fetal lung tissue.
Measurement of fatty acid synthase activity.

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Assessment of glucocorticoid effects on lipid biosynthesis enzymes.

Main Results:

Fetal lung exhibits significant de novo fatty acid biosynthesis, particularly during late gestation.
Glucocorticoids stimulate both de novo fatty acid biosynthesis and fatty acid synthase activity in the fetal lung.
Fatty acid synthase is identified as a glucocorticoid-inducible enzyme in fetal lung lipid metabolism.

Conclusions:

De novo fatty acid biosynthesis is critical for providing fatty acids for surfactant phospholipids.
Fatty acids may directly regulate phosphatidylcholine biosynthesis by activating key enzymes like choline-phosphate cytidylyltransferase.
Glucocorticoids play a significant role in promoting fetal lung maturation by enhancing fatty acid and surfactant synthesis.