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Glycogen content and lipid biosynthesis in the lungs of fetuses of diabetic rats
Insights
Maternal diabetes in rats impairs fetal lung lipid production by blocking glycogen utilization. Insulin treatment largely reverses this effect, aiding surfactant phospholipid development.
Area of Science:
- Biochemistry
- Developmental Biology
- Endocrinology
Background:
- Fetal lung development relies on glycogen stores for lipid synthesis.
- Maternal diabetes can impact fetal development and organ function.
- Surfactant phospholipids are crucial for lung maturation and function.
Purpose of the Study:
- To investigate the impact of maternal diabetes on fetal pulmonary glycogen and lipid biosynthesis.
- To assess the effect of insulin treatment on these parameters in diabetic pregnancies.
- To elucidate the role of pulmonary glycogen in fetal lung lipid production.
Main Methods:
- Quantification of fetal pulmonary glycogen content at specific gestational days (18, 20, 22).
- Measurement of neutral lipid and phospholipid biosynthesis in fetal lungs.
- Comparison between offspring of normal, diabetic, and insulin-treated diabetic rats.
Main Results:
- Fetal pulmonary glycogen peaked at day 20 and decreased thereafter in all groups.
- Diabetic rat fetuses exhibited higher glycogen and lower lipid biosynthesis than controls.
- Insulin treatment normalized pulmonary lipid biosynthesis and glycogen accumulation in fetuses.
Conclusions:
- Maternal diabetes transiently blocks fetal pulmonary glycogen utilization for lipid biosynthesis.
- This block particularly affects surfactant phospholipid production.
- Insulin therapy can mitigate the adverse effects of maternal diabetes on fetal lung development.
Abstract:
The fetal pulmonary glycogen content and the pulmonary biosynthesis of neutral lipids and phospholipids were estimated at gestational days 18, 20, and 22 in the offspring of normal, manifest diabetic, and insulin-treated diabetic rats. In all groups the fetal pulmonary glycogen concentration was highest on gestational day 20 and decreased during the subsequent 2 days. At the same time the biosynthesis of neutral lipids and phospholipids increased in the fetal lungs. The fetuses of the manifest diabetic rats showed an increased glycogen concentration and decreased total lipid biosynthesis compared with the other two groups. Insulin treatment of the rat mothers largely normalized the pulmonary lipid biosynthesis and glycogen accumulation in their fetuses. These data suggest that the diabetic maternal environment induces a transient block in the fetal utilization of pulmonary glycogen for the biosynthesis of lipids, in particular for the production of surfactant phospholipids.