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Related Experiment Videos

Structure-function relationships of heparin species.

R D Rosenberg, G Armand, L Lam

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1978
    PubMed
    Summary

    Low molecular weight heparin fractions were isolated, revealing distinct structural differences. Highly active heparin exhibits increased glucuronic acid and N-acetylated glucosamine, correlating with specific anticoagulant activity.

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    Area of Science:

    • Biochemistry
    • Pharmacology
    • Glycobiology

    Background:

    • Heparin is a complex polysaccharide with significant anticoagulant properties.
    • Low molecular weight heparin (LMWH) fractions are widely used therapeutically.
    • Understanding structural variations in LMWH is crucial for optimizing anticoagulant efficacy.

    Purpose of the Study:

    • To fractionate porcine heparin species of low molecular weight.
    • To characterize structural differences between highly active and relatively inactive heparin preparations.
    • To correlate specific structural features with anticoagulant activity.

    Main Methods:

    • Affinity chromatography was used to fractionate low molecular weight heparin.
    • Specific anticoagulant activity was measured in units/mg.
    • Structural analysis focused on uronic acid and glucosamine residue composition and sequence.

    Main Results:

    • Two heparin fractions with distinct anticoagulant activities (360 units/mg and 4 units/mg) were obtained.
    • Highly active heparin showed increased glucuronic acid and N-acetylated glucosamine, with fewer N-sulfated glucosamine residues.
    • A specific tetrasaccharide sequence, potentially contributing to high activity, was more abundant in the active fraction.

    Conclusions:

    • Structural variations, particularly in uronic acid and glucosamine modifications, significantly influence heparin's anticoagulant potency.
    • The presence and distribution of specific structural motifs, like the identified tetrasaccharide, are key determinants of heparin activity.
    • These findings provide insights into the structure-activity relationship of heparin, aiding in the development of more effective anticoagulant therapies.

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