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The effect of early postnatal undernutrition on the growth and development of the rat brain
Insights
Early life undernutrition in rat pups significantly impairs brain development, reducing protein, DNA, and myelin precursor synthesis during critical growth periods.
Area of Science:
- Neuroscience
- Developmental Biology
- Biochemistry
Background:
- Undernutrition during early life can have lasting impacts on brain development.
- The brain growth-spurt is a critical period for neuronal and glial cell development.
Purpose of the Study:
- To investigate the effects of maternal low-protein diet on rat pup brain development.
- To assess biochemical and enzymatic changes in the brains of undernourished pups during the brain growth-spurt.
Main Methods:
- Rat pups were fed a low-protein diet from day 3 postpartum to induce undernutrition.
- Brain tissue was analyzed for protein, DNA, glycosides, and glycoproteins at various developmental stages.
- Enzyme activities related to neurotransmission and myelin synthesis were measured.
Main Results:
- Undernourished pups exhibited significantly reduced brain protein and DNA content.
- Levels of gangliosides and glycoproteins were decreased in undernourished brains.
- Key enzyme activities were lower and delayed in their peak attainment in deprived animals.
Conclusions:
- Prenatal and early postnatal undernutrition during the brain growth-spurt leads to deficits in glial cell populations.
- This results in impaired myelin formation capacity and reduced development of cellular processes.
- Early life nutrition is crucial for optimal brain development and function.
Abstract:
1. Rat pups were undernourished during the period of the brain growth-spurt by feeding their mothers a low-protein diet from the third day post partum. 2. The pups were killed on days 5, 6, 9, 12, 16, 20 and 24 post partum, and their brains were analysed for protein, DNA, glycosides and glycoproteins. The activities of four enzymes involved in neurotransmission, and in the synthesis of glycolipids and myelin were also measured. Results of the analyses were compared with those obtained for pups that were suckled by well-nourished dams. 3. The brains of the undernourished pups contained substantially less protein and DNA; gangliosides and glycoproteins were also reduced. 4. All four enzymes showed lower peak activities in the nutritionally deprived animals, and the attainment of peak activity was retarded by several days. 5. These results suggest that undernutrition imposed during the brain growth-spurt leads to a deficit in the glial cell population and thus in the capacity to form myelin, and reduced development of cellular processes.