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Developmental changes in brain glycoproteins

R K Margolis, C Preti, D Lai

    Brain Research
    |August 13, 1976
    PubMed
    Summary
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    Postnatal rat brain development shows significant increases in specific glycoproteins, particularly those rich in glucosamine, mannose, and galactose. A decrease in a stable glucose polymer was also observed during this period.

    Area of Science:

    • Neuroscience
    • Biochemistry
    • Developmental Biology

    Background:

    • Brain glycoproteins play crucial roles in neural development and function.
    • Understanding the dynamic changes in glycoprotein composition during postnatal development is essential for comprehending brain maturation.

    Purpose of the Study:

    • To investigate the changes in brain glycoprotein concentration and composition during postnatal development in rats.
    • To identify specific glycoprotein populations and their oligosaccharide structures that emerge during this critical period.

    Main Methods:

    • Analysis of glycoprotein concentrations (mannose, galactose, glucosamine, sialic acid, fucose) in rat brains at different postnatal ages (1-30 days).
    • Characterization of glycopeptides from rat brains using molecular size and composition analyses.

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  • Quantification of a stable glucose polymer in young rat brains.

    • Main Results:

    • Significant increases (70-100%) in mannose, galactose, and glucosamine levels in brain glycoproteins from day 1 to 30.
    • Smaller increases (35-55%) in sialic acid and fucose levels.
    • Identification of a distinct glycoprotein population with oligosaccharides rich in core sugars (glucosamine, mannose, galactose) and deficient in terminal sugars (fucose, sialic acid).
    • A substantial decrease (93%) in a metabolically stable glucose polymer during postnatal development.

    Conclusions:

    • Postnatal brain development in rats involves the preferential synthesis of specific glycoproteins with characteristic oligosaccharide structures.
    • The presence of a stable glucose polymer in young rat brains may explain previously reported glucose findings in brain glycopeptides.