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Related Experiment Videos

Anticomplementary activity of dextran derivatives.

M Mauzac, F Maillet, J Jozefonvicz

    Biomaterials
    |January 1, 1985
    PubMed
    Summary

    Modified dextran molecules exhibit antithrombic and anticomplementary properties. High levels of sulfonation in carboxylic dextrans enhance both activities, suggesting specific structural requirements for these biological effects.

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    Area of Science:

    • Biochemistry
    • Immunology
    • Polymer Chemistry

    Background:

    • Dextran derivatives are explored for their biological activities.
    • Understanding structure-activity relationships is crucial for developing new therapeutics.
    • Complement system activation and thrombosis are key pathological processes.

    Purpose of the Study:

    • To investigate the antithrombic and anticomplementary activities of dextran substituted with carboxylic and benzylamine sulfonate groups.
    • To elucidate the relationship between the degree of substitution and these biological properties.

    Main Methods:

    • Chemical modification of dextran with carboxylic and benzylamine sulfonate groups.
    • Assays to measure antithrombic activity.
    • Assays to assess inhibition of complement C3 convertase formation.
    • Comparison with heparin's activity.

    Main Results:

    • Dextran substitution with carboxylic and benzylamine sulfonate groups conferred antithrombic and anticomplementary activities.
    • Dextrans with >40% carboxylic substitution and >10% sulfonate content showed potent anticomplementary and antithrombic effects.
    • Lower sulfonation levels resulted in strong anticomplementary but weak antithrombic activity.
    • Anticomplementary activity was comparable to heparin, but anticoagulant activity was significantly lower.

    Conclusions:

    • Dextran modification can yield compounds with significant antithrombic and anticomplementary properties.
    • The degree of sulfonation plays a critical role in modulating these activities.
    • Structural features influencing anticomplementary and antithrombic activities appear distinct, even when compared to heparin.

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