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Development of lipidic composition of neonatal chick liver and intestine microsomes: changes induced by cholesterol
Insights
Chick liver and intestine microsomes show changes in free cholesterol during early development. Cholesterol feeding increases both free and esterified cholesterol, while phospholipid content remains stable.
Area of Science:
- Biochemistry
- Developmental Biology
- Animal Nutrition
Background:
- Microsomes are crucial cellular components involved in lipid metabolism.
- Understanding lipid changes in young animals is vital for nutritional and physiological studies.
- Cholesterol and phospholipids play key roles in cell membrane structure and function.
Purpose of the Study:
- To investigate the changes in cholesterol and phospholipid content in chick liver and intestine microsomes during the first two weeks of life.
- To determine the impact of dietary cholesterol on these lipid components.
Main Methods:
- Analysis of free and esterified cholesterol levels.
- Quantification of total phospholipids.
- Identification and quantification of major phospholipid classes (phosphatidylcholine, phosphatidylethanolamine).
- Comparison of lipid profiles in chicks during postnatal development and after cholesterol supplementation.
Main Results:
- Postnatal development primarily influenced free cholesterol levels in chick microsomes.
- Dietary cholesterol significantly increased both free and esterified cholesterol in liver and intestine microsomes.
- Total phospholipid content in chick liver and intestine microsomes showed no significant changes post-hatching.
- Phosphatidylcholine and phosphatidylethanolamine were the predominant phospholipids, with their relative percentages unaffected by cholesterol feeding.
Conclusions:
- Free cholesterol is a key variable in microsomal lipid composition during early chick development.
- Dietary cholesterol supplementation effectively elevates cholesterol levels in chick microsomes without altering phospholipid profiles.
- The stability of phospholipid content suggests a robust homeostatic mechanism in young chicks' microsomal membranes.
Abstract:
Changes in cholesterol and phospholipid content of chick liver and intestine microsomes were studied throughout the two first weeks of life. Differences observed throughout postnatal development were mainly due to the free cholesterol. Cholesterol feeding resulted in a clear increase of the amounts of both free and esterified cholesterol. Phospholipid content of chick liver and intestine microsomes did not change significantly after hatching. Phosphatidylcholine and phosphatidylethanolamine were found to be the major phospholipids. Although the amount of each phospholipid could be affected by cholesterol feeding, its relative percentage did not change by this treatment.