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Related Experiment Videos

Decrease of carbohydrate in membrane glycoproteins during human erythrocyte ageing in vivo

L Gattegno, G Perret, F Fabia

    Mechanisms of Ageing and Development
    |July 1, 1981
    PubMed
    Summary
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    Erythrocyte membrane glycoproteins show reduced neutral hexoses and sialic acid with aging. This decrease affects all glycoprotein groups, including glycophorins, impacting surface sugar residues on aged red blood cells.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Gerontology

    Background:

    • Erythrocyte membranes undergo changes during in vivo aging.
    • Previous studies noted decreased neutral hexoses and sialic acid in aged erythrocyte membranes.
    • The specific glycoprotein fractions affected by these changes were not fully elucidated.

    Purpose of the Study:

    • To investigate the changes in neutral hexoses and sialic acid content across different glycoprotein fractions of aging human erythrocytes.
    • To identify which specific membrane glycoprotein groups are affected by the reduction in surface galactose and N-acetylgalactosamine residues during erythrocyte aging.

    Main Methods:

    • Fractionation of membrane glycoproteins from young and in vivo aged human erythrocytes using gel filtration.
    • Quantification of neutral hexoses and sialic acid content in isolated glycoprotein fractions.

    Related Experiment Videos

  • Analysis of surface galactose and N-acetylgalactosamine residue changes in aging erythrocytes.

    • Main Results:

    • Three major glycoprotein groups were isolated from erythrocyte membranes.
    • All tested glycoprotein groups, including glycophorins, showed significantly reduced neutral hexoses and sialic acid in aged cells compared to young cells.
    • Decreased surface galactose and N-acetylgalactosamine residues in aging erythrocytes were found to affect multiple glycoprotein groups, including band 3, PAS-1, PAS-4, and PAS-3.

    Conclusions:

    • The reduction in neutral hexoses and sialic acid during erythrocyte aging is a widespread phenomenon affecting all major membrane glycoprotein fractions.
    • Aging impacts various cell surface carbohydrate residues across multiple glycoprotein types, not limited to a single fraction.
    • These findings provide insights into the molecular alterations of the erythrocyte membrane during senescence and their physiological implications.