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Prematurity and lecithin-cholesterol acyltransferase deficiency in newborn infants
Insights
Premature infants show impaired lipid clearance due to lower lecithin-cholesterol acyltransferase (LCAT) activity. This enzyme deficiency is linked to gestational age and affects cholesterol ester formation in newborns.
Area of Science:
- Biochemistry
- Neonatology
- Lipid Metabolism
Background:
- Hyperlipidemia and fat accumulation occur in premature newborns.
- Lecithin-cholesterol acyltransferase (LCAT) is crucial for lipid transport and cholesterol esterification.
- Full-term infants have significantly lower cord plasma LCAT activity than adults.
Purpose of the Study:
- To investigate the relationship between cord plasma LCAT activity and gestational age in newborns.
- To examine cholesterol ester to free cholesterol ratios in premature infants compared to full-term infants and adults.
- To determine the potential role of LCAT deficiency in impaired lipid clearance in premature infants.
Main Methods:
- Analysis of cord plasma LCAT activity in relation to gestational age.
- Measurement of cholesterol ester to free cholesterol ratios in different newborn groups and adults.
Main Results:
- A significant positive correlation was found between cord plasma LCAT activity and gestational age.
- Newborns with gestational age < 32 weeks had a significantly lower cholesterol ester to free cholesterol ratio compared to full-term infants and adults.
- Cord plasma LCAT activity in full-term infants was approximately half that of adults.
Conclusions:
- LCAT activity and cholesterol ester formation are reduced in premature infants, particularly those with gestational age less than 32 weeks.
- LCAT deficiency may contribute to inadequate lipid clearance in premature newborns.
- Gestational age is a significant factor influencing neonatal LCAT activity and lipid metabolism.
Abstract:
The occurrence of hyperlipidemia and fat accumulation in certain tissues of premature newborn infants is known. Lecithin-cholesterol acyltransferase (LCAT) catalyzes esterification of free cholesterol and is important in the transport and disposal of lipids. Cord plasma LCAT activity of full-term newborn infants is nearly one-half of that present in the adult plasma. The present study also has found a significant positive correlation between cord plasma LCAT activity and gestational age of the newborn. The ratio of circulating cholesterol ester to free cholesterol was significantly lower only in newborn infants with gestational age less than 32 wk, in comparison to full-term newborn infants or adults. LCAT deficiency and decreased cholesterol ester formation may be responsible for the inadequate lipid clearance in premature newborn infants.