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Comparative studies on amniotic fluid and plasma fibronectins

E Ruoslahti, E Engvall, E G Hayman

    The Biochemical Journal
    |January 1, 1981
    PubMed
    Summary

    Human fibronectin from amniotic fluid is more glycosylated than plasma fibronectin, with differences in carbohydrate content but not amino acid composition or cell-attachment activity.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Glycobiology

    Background:

    • Fibronectin is a crucial extracellular matrix glycoprotein involved in cell adhesion, migration, and differentiation.
    • Variations in fibronectin structure and glycosylation have been observed across different tissues and developmental stages.
    • Understanding fibronectin heterogeneity is key to elucidating its diverse biological roles.

    Purpose of the Study:

    • To compare the biochemical and functional properties of human fibronectin isolated from amniotic fluid and adult plasma.
    • To investigate potential differences in glycosylation patterns between amniotic fluid fibronectin and plasma fibronectin.
    • To assess the impact of these differences on fibronectin's cell attachment promoting activity and immunological characteristics.

    Main Methods:

    • Isolation of human fibronectin from second-trimester amniotic fluid, term amniotic fluid, and adult plasma.
    • Analysis of molecular weight using sodium dodecyl sulphate/polyacrylamide-gel electrophoresis (SDS-PAGE).
    • Quantification of carbohydrate content (total carbohydrate, mannose, sialic acid, glucosamine, galactosamine, galactose, fucose) and amino acid composition.
    • Assessment of functional activity via cell attachment assays and immunological characterization using antibody-based methods.

    Main Results:

    • Amniotic fluid fibronectins exhibited a slightly higher apparent molecular weight compared to plasma fibronectin.
    • Fibronectin from amniotic fluid was significantly more glycosylated (9.5-9.6% carbohydrate) than plasma fibronectin (5.8% carbohydrate).
    • Specific differences in monosaccharide composition were noted, with higher levels of glucosamine, galactosamine, galactose, and fucose in amniotic fluid fibronectin.
    • No significant differences were found in amino acid composition or peptide patterns after tryptic digestion.
    • Both amniotic fluid and plasma fibronectins demonstrated equal efficacy in promoting cell attachment and were immunologically indistinguishable.

    Conclusions:

    • Human fibronectin isolated from amniotic fluid is more heavily glycosylated than that from adult plasma.
    • These observed glycosylation differences do not affect fibronectin's cell-attachment promoting activity or immunological identity.
    • The variations in glycosylation may be linked to the specific cell type (amniotic fluid cells vs. plasma cells) and/or the developmental stage.

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