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Last Updated: June 4, 2023

Patent: 5,650,389

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Summary for Patent: 5,650,389
Title: Methods for the inhibition of complement activation
Abstract:Decorin, a small collagen-binding dermatan sulfate proteoglycan, is widely distributed as a component of extracellular matrices. Using a solid phase binding assay, the inventors demonstrated that decorin bound C1q at physiologic pH and ionic strength. The interaction did not require divalent cations and was time and temperature dependent reaching equilibrium in 4 hours at C. Binding was specific and saturable with an apparent dissociation constant of 7.6.times.10.sup.-9 M. Decorin was shown to bind pepsin-derived fragments containing the collagenous domain of C1q and collagenase-derived fragments containing the globular domain of C1q. Since these fragments share a short sequence of amino acids, this finding suggests that decorin binds to a region of C1q located near the junction of the two domains. Competition studies using purified preparations of the decorin core protein and the glycosaminoglycan chains showed that only the former inhibited binding of decorin to C1q indicating that the interaction is mediated by the decorin core protein. Decorin was shown to inhibit the hemolytic activity of purified C1 as well as C1 in normal human serum. Approximately 50% inhibition was observed at a decorin concentration of 2 .mu.g/ml. Inhibition was not observed if C1 was bound to antigen-complexed antibody. Furthermore, neither the core protein, nor the glycosaminoglycan chain of decorin inhibited C1 indicating that the intact proteoglycan is necessary for functional activity. These studies therefore demonstrate the usefulness of decorin and related proteoglycans in suppression of complement activation of the immune system.
Inventor(s): Krumdieck; Richard (Birmingham, AL), Hook; Magnus A. O. (Houston, TX), Volanakis; John E. (Birmingham, AL)
Assignee: University of Alabama at Birmingham Research Foundation (Birmingham, AL)
Application Number:08/025,357
Patent Claims:see list of patent claims

Details for Patent 5,650,389

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Merck Sharp & Dohme Corp. ZOSTAVAX zoster vaccine live For Injection 125123 05/25/2006 ⤷  Try a Trial 2039-09-23
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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