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Reduced amyloid-A-degrading activity in serum in amyloidosis associated with rheumatoid arthritis

O Wegelius, A M Teppo, C P Maury

    British Medical Journal (Clinical Research Ed.)
    |February 27, 1982
    PubMed

    Insights

    Serum

    Area of Science:

    • Biochemistry
    • Immunology
    • Rheumatology

    Background:

    • Rheumatoid arthritis (RA) can lead to amyloidosis.
    • Amyloid A (AA) fibril deposition is a hallmark of AA amyloidosis.
    • Understanding the degradation of AA fibrils is crucial for disease management.

    Purpose of the Study:

    • To investigate the serum's capacity to degrade amyloid A fibrils.
    • To compare this activity in patients with and without rheumatoid arthritis-associated amyloidosis.
    • To identify factors influencing amyloid A fibril degradation.

    Main Methods:

    • Radial diffusion method was employed.
    • Fibrillar amyloid A protein was used as a substrate.
    • Serum samples from patients with amyloidosis, RA without amyloidosis, and healthy controls were analyzed.

    Main Results:

    • Serum amyloid A (AA) fibril degrading activity was significantly lower in patients with RA and amyloidosis compared to RA patients without amyloidosis and healthy controls.
    • Elevated alpha 1-antitrypsin concentrations were observed in both patient groups.
    • Alpha 1-antitrypsin inhibited AA fibril degrading activity, showing a negative correlation with activity levels.

    Conclusions:

    • Reduced amyloid A fibril degrading activity in patients with rheumatoid arthritis-associated amyloidosis is attributed to inhibition, not enzyme deficiency.
    • Alpha 1-antitrypsin is identified as a key inhibitor of amyloid A fibril degradation in serum.
    • These findings suggest potential therapeutic targets for managing amyloidosis.

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