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Molecular mechanism underlying sialic acid as an essential nutrient for brain development and cognition
1School of Molecular Bioscience, University of Sydney, Australia. bing.wang@sydney.edu.au
Insights
Sialic acid (Sia) in human milk is vital for infant brain development, supporting neural connections and memory. Supplementing with Sia enhances learning and memory, highlighting its importance for cognitive function.
Area of Science:
- Neuroscience
- Developmental Biology
- Biochemistry
Background:
- Infant neurodevelopment involves rapid neural growth, demanding significant nutrients.
- Sialic acid (Sia) is crucial for brain gangliosides and glycoproteins, particularly polysialic acid (polySia) on neural cell adhesion molecules (NCAM).
- Human milk is rich in Sia, primarily N-acetylneuraminic acid (Neu5Ac), while infant formula has lower levels and includes N-glycolyneuraminic acid (Neu5Gc), linked to inflammation.
Purpose of the Study:
- To investigate the role of sialic acid (Sia) in infant neurodevelopment and cognitive function.
- To compare Sia content in human milk and infant formula.
- To explore the impact of dietary Sia on learning and memory.
Main Methods:
- Analysis of Sia content in human milk and infant formula.
- Review of existing literature on Sia's role in neural development.
- Studies on the effects of Sia-rich diets in animal models (postnatal piglets).
Main Results:
- Human milk contains high levels of Sia-glycoconjugates, predominantly Neu5Ac.
- Infant formula has lower Sia levels and contains Neu5Gc, which is implicated in inflammatory diseases.
- Dietary Sia supplementation in piglets increased brain Sia levels, enhanced learning-related gene expression, and improved learning and memory.
Conclusions:
- Sialic acid (Sia) is essential for infant brain development, supporting neuronal outgrowth, synaptic connectivity, and memory formation.
- Human milk provides critical Sia for optimal neurodevelopment.
- Dietary Sia supplementation shows promise for enhancing cognitive functions like learning and memory.
Abstract:
The early stages of neurodevelopment in infants are crucial for establishing neural structures and synaptic connections that influence brain biochemistry well into adulthood. This postnatal period of rapid neural growth is of critical importance for cell migration, neurite outgrowth, synaptic plasticity, and axon fasciculation. These processes thus place an unusually high demand on the intracellular pool of nutrients and biochemical precursors. Sialic acid (Sia), a family of 9-carbon sugar acids, occurs in large amounts in human milk oligosaccharides and is an essential component of brain gangliosides and sialylated glycoproteins, particularly as precursors for the synthesis of the polysialic acid (polySia) glycan that post-translationally modify the cell membrane-associated neural cell adhesion molecules (NCAM). Human milk is noteworthy in containing exceptionally high levels of Sia-glycoconjugates. The predominate form of Sia in human milk is N-acetylneuraminic acid (Neu5Ac). Infant formula, however, contains low levels of Sia consisting of both Neu5Ac and N-glycolyneuraminic acid (Neu5Gc). Current studies implicate Neu5Gc in several human inflammatory diseases. Polysialylated NCAM and neural gangliosides both play critical roles in mediating cell-to-cell interactions important for neuronal outgrowth, synaptic connectivity, and memory formation. A diet rich in Sia also increases the level of Sia in the brains of postnatal piglets, the expression level of 2 learning-related genes, and enhances learning and memory.
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