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Related Experiment Videos

Human amyloid P component: an elastase inhibitor.

J J Li, K P McAdam

    Scandinavian Journal of Immunology
    |September 1, 1984
    PubMed
    Summary
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    Amyloid P component (AP) inhibits elastase, an enzyme that degrades elastin and amyloid fibrils. This finding suggests AP protects these structures from breakdown, potentially explaining amyloid deposit resistance.

    Area of Science:

    • Biochemistry
    • Immunology
    • Proteomics

    Background:

    • Amyloid deposits contain amyloid P component (AP), a pentraxin protein.
    • AP is also found with elastin fibers in skin and basement membranes.

    Purpose of the Study:

    • To investigate the interaction between human AP and porcine pancreatic elastase.
    • To determine if AP inhibits elastase activity and its potential role in protecting elastin and amyloid fibrils.

    Main Methods:

    • Purified human AP was incubated with porcine pancreatic elastase.
    • Elastase activity was measured using enzyme kinetics.
    • Inhibition was assessed after heating AP and by comparing with control proteins (albumin, C-reactive protein).

    Main Results:

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    • Human AP inhibited elastase activity, reducing the elastolytic rate.
    • AP's inhibitory effect persisted after heating to 70°C.
    • Albumin and C-reactive protein did not inhibit elastase.
    • AP's inhibition was reversible at high substrate concentrations.

    Conclusions:

    • AP functions in vivo to protect elastin and amyloid fibrils from proteolytic cleavage.
    • This protective role of AP may contribute to the resistance of amyloid deposits to resorption.