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Changes in plasma lipoproteins and liver lipids in neonatal rats
V García-Molina1, J A Aguilera, A Gil
1Department of Biochemistry and Molecular Biology, University of Granada, Spain.
Insights
Newborn rat livers show transient lipid increases. Plasma lipoproteins like very-low-density lipoprotein (VLDL) and high-density lipoprotein (HDL) rise post-birth, mirroring human infant development.
Area of Science:
- Biochemistry
- Developmental Biology
- Lipid Metabolism
Background:
- Lipoprotein metabolism undergoes significant changes during the perinatal period.
- Understanding early-life lipid changes is crucial for assessing long-term metabolic health.
- Rat models offer valuable insights into conserved developmental pathways.
Purpose of the Study:
- To investigate the developmental changes in plasma lipoprotein levels and composition in rats during the first week of life.
- To compare these early-life changes to those observed in human infants.
Main Methods:
- Analysis of transient increases in triglycerides and cholesterol in rat liver immediately after birth.
- Quantification of plasma very-low-density lipoprotein (VLDL) and high-density lipoprotein (HDL) levels.
- Assessment of cholesterol ester content and apolipoprotein composition (C and E) in LDL and HDL.
Main Results:
- Transient increases in liver triglycerides and cholesterol were observed immediately post-birth.
- Plasma VLDL and HDL levels increased after birth, plateauing by one week.
- Cholesterol ester content increased in LDL and HDL during the first week; VLDL and HDL showed distinct apolipoprotein enrichment and depression patterns.
Conclusions:
- Early postnatal life in rats is characterized by dynamic changes in lipoprotein metabolism.
- The observed developmental trajectory of lipoprotein levels and composition in rats closely resembles that of human infants.
- These findings highlight the utility of the rat model for studying human neonatal lipid development.
Abstract:
Transient increases in triglycerides and cholesterol were found in rat liver immediately after birth. Plasma VLDL and HDL increased after birth and reached a plateau after one week of life. The content of cholesterol ester was low at birth in all lipoproteins and increased in LDL and HDL during the first week of life. After birth, VLDL became enriched in apolipoproteins C and E, whereas HDL was enriched in apolipoprotein C and depressed in apolipoprotein E. The developmental changes in plasma lipoprotein levels and compositions in rats during the first week of life are comparable to those described in humans.