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Metabolic transformation of intracraneally injected [1-14C]linoleic and [1-14C]alpha-linolenic acids in malnourished
M E de Tomás1, O Mercuri, C Serres
1Instituto de Investigaciones Bioquimicas de La Plata (INIBIOLP), Facultad de Ciencias Medicas, Argentina.
Insights
Low protein diets during pregnancy impact brain lipid composition in infant rats, altering fatty acid profiles in phosphatidylcholine (PC) and phosphatidylethanolamine (PE). These changes suggest specific mechanisms maintain brain lipid structure despite nutritional challenges.
Area of Science:
- Neuroscience
- Nutritional Biochemistry
- Developmental Biology
Background:
- Maternal nutrition significantly influences offspring neurodevelopment.
- Brain lipid composition, particularly phospholipids like phosphatidylcholine (PC) and phosphatidylethanolamine (PE), is crucial for neuronal function.
- Understanding how dietary factors affect brain fatty acid profiles is essential for optimizing infant brain health.
Purpose of the Study:
- To investigate the impact of maternal low protein diet on brain phospholipid fatty acid composition in neonatal rats.
- To examine the metabolic transformation of essential fatty acids in the brain under conditions of protein deficiency.
- To elucidate the mechanisms involved in maintaining brain lipid homeostasis during early development.
Main Methods:
- Analysis of fatty acid composition in phosphatidylcholine (PC) and phosphatidylethanolamine (PE) from neonatal rat brains.
- Intracranial injection of radiolabeled [1-14C]linoleic and [1-14C]alpha-linolenic acids to study in vivo metabolism.
- Quantification of labeled precursors and their derivatives in brain phospholipids.
Main Results:
- Maternal protein restriction led to an increase in n-9 fatty acids in PC and a decrease in linoleic acid series in PE.
- No significant changes were observed in the double bond index of PC or PE.
- The distribution of labeled fatty acids and their metabolites in PC and PE differed from the overall mass distribution.
Conclusions:
- Partial protein deprivation during early development alters specific brain phospholipid fatty acid profiles.
- Brain lipid metabolism demonstrates a capacity to maintain certain fatty acid patterns despite dietary challenges.
- Direct uptake of polyunsaturated fatty acids and/or slow turnover rates may play a role in preserving brain lipid composition.
Abstract:
The effect of a low protein diet during pregnancy and lactation on the fatty acid composition of phosphatidylcholine (PC) and phosphatidylethanolamine (PE) from brains of ten-day-old rats was studied. The results indicated that partial deprivation of protein during early development was associated with an increase in the fatty acids of the n-9 family in PC. The fatty acids of the linoleic acid series decreased in PE but were not modified in PC. These minor changes did not affect the double bond index values either in PC or in PE. The effect of protein depletion on the in vivo metabolic transformation of intracraneally injected [1-14C]linoleic and [1-14C]alpha-linolenic acids was also studied. The percentage distribution of the labeled precursors and their derivatives among PC and PE differed from that of mass distribution. These results indicate that the direct uptake of polyunsaturated fatty acids from the blood and/or the low turnover rate of these acids incorporated into PC and PE might be involved in maintaining the fatty acid pattern of these brain lipids.