Related Experiment Videos
[The liver as a source of essential long chain polyunsaturated fatty acids for postnatal brain development in the
V Azavache1, C Cuevas, V Bosch
1Sección de Lipidología del Instituto de Medicina Experimental, Facultad de Medicina U.C.V. Caracas, Venezuela.
Insights
Newborn rats rely on milk for crucial long-chain polyunsaturated fatty acids (LC-PUFA) essential for brain development, as their livers have low synthesis activity. Preformed LC-PUFA from milk are vital for neonatal brain growth.
Area of Science:
- Biochemistry
- Developmental Biology
- Nutritional Science
Context:
- Essential long-chain polyunsaturated fatty acids (LC-PUFA) are critical for neonatal brain development.
- Understanding the source of these fatty acids in early life is crucial for ensuring proper neurological function.
- Rat neonates exhibit distinct metabolic profiles compared to adults regarding fatty acid synthesis.
Purpose:
- To investigate the origin of essential long-chain polyunsaturated fatty acids (LC-PUFA) required for early postnatal brain development in rats.
- To determine the delta 6 fatty acid desaturase activity and fatty acid composition in neonatal rat liver microsomes.
- To analyze the fatty acid composition of milk, plasma, and brain tissue in suckling rats.
Summary:
- Neonatal rats possess very low delta 6 fatty acid desaturase activity in liver microsomes compared to adults.
- Significant amounts of docosahexaenoic acid (DHA) and arachidonic acid (AA) were found in milk, liver microsomes, plasma lipids, and brain tissue of neonates.
- The study concludes that neonatal brain DHA and AA are primarily obtained from preformed fatty acids in milk, not liver synthesis.
Impact:
- Suggests that milk composition is a primary determinant of neonatal brain fatty acid status.
- Highlights the importance of maternal nutrition and milk transfer for infant brain development.
- Provides insights into the metabolic pathways and nutritional requirements during the critical postnatal period.
Abstract:
We address here the issue concerning the origin of essential long chain polyunsaturated fatty acids (LC-PUFA) needed for early postnatal brain development. Normal newborn rats 1, 5, 10 and 20 day-old were decapitated, immediately after, the livers were processed to obtain the microsomal fraction and its delta 6 fatty acid desaturase activity and fatty acid composition were determined. Samples of plasma, whole homogenized brain hemispheres and milk contained in the gastric cavity of the suckling rats, were analyzed to obtained their fatty acid composition. We fond that the rat neonate has a very low delta 6 desaturase activity in liver microsomes as compared with the adult. In contrast, there is a considerable quantity of DHA an AA in the milk, liver microsomes, plasma lipids and brain. In conclusion, we propose that brain DHA and AA cannot be derived substantially through liver synthesis, but through the availability of these preformed fatty acids in the milk. These fatty acids are concentrated in liver microsomes and then secreted into plasma lipid pool to reach finally to brain structures.