Supplementation of 3'-Sialyllactose During the Growth Period Improves Learning and Memory Development in Mice

Area of Science:

• Neuroscience
• Developmental Biology
• Nutritional Science

Background:

• 3'-Sialyllactose (3'-SL) is a key acidic oligosaccharide in human milk.
• Cognitive development is crucial during early life stages.
• The role of milk oligosaccharides in brain development requires further elucidation.

Purpose of the Study:

• To investigate the cognitive-enhancing effects of 3'-SL in young mice.
• To elucidate the molecular mechanisms underlying 3'-SL's impact on brain function.
• To explore the interplay between 3'-SL, gut microbiota, and brain development.

Main Methods:

• Oral administration of 3'-SL to C57BL/6 mice for 6 weeks.
• Behavioral tests to assess cognitive and memory functions.
• Analysis of gene expression in hippocampal tissue and gut microbiota composition.

Main Results:

• 3'-SL supplementation improved cognitive and memory development in mice.
• Increased sialic acid metabolism and expression of learning-related genes (including NCAM, FGFR) in the hippocampus.
• Alterations in gut microbiota composition and increased free sialic acid production.

Conclusions:

• 3'-SL promotes cognitive development in mice through enhanced sialic acid metabolism and neural gene expression.
• The gut microbiota plays a synergistic role in producing sialic acid for brain development.
• 3'-SL represents a potential nutritional intervention for supporting cognitive function.