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Related Experiment Videos

A new serum proteolytic enzyme in aneurysm pathogenesis.

S L Brown, B Backstrom, R W Busuttil

    Journal of Vascular Surgery
    |May 1, 1985
    PubMed
    Summary

    Researchers identified a novel serum compound linked to arterial wall degradation in patients with atherosclerosis and aortic aneurysms. This enzyme-like substance, elevated in patients and post-surgery, may contribute to aneurysm formation by degrading arterial tissue.

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    Area of Science:

    • Biochemistry
    • Vascular Biology
    • Pathogenesis of Aneurysmal Disease

    Background:

    • The exact cause of arterial wall degradation in aneurysmal disease is not fully understood.
    • Previous research indicated increased collagenase and elastase in aortic aneurysm tissue.
    • Potential factors include stress-strain, structural abnormalities, and enzyme imbalance.

    Purpose of the Study:

    • To report and characterize a newly identified serum compound with elastase-like activity.
    • To investigate the compound's association with atherosclerotic disease and aneurysm formation.
    • To explore the compound's potential role in arterial wall degradation.

    Main Methods:

    • Characterization of a novel serum compound exhibiting elastase substrate hydrolysis.

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  • Measurement of serum compound levels in patients with atherosclerotic disease and post-aneurysmectomy.
  • Analysis of the compound's biochemical properties (lipid-bound, subunits, enzyme characteristics, optimal pH).

    • Main Results:

    • A novel serum compound, distinct from elastase, was identified and characterized.
    • This compound is elevated in patients with atherosclerotic disease and increases threefold after aneurysmectomy.
    • The substance is lipid-bound, composed of four subunits, and exhibits thiol, carboxyl, and metalloenzyme characteristics, active at pH 7.0-8.0.

    Conclusions:

    • The identified serum compound is associated with atherosclerotic disease and aneurysm progression.
    • It is postulated that mononuclear cells produce and release this compound into the serum.
    • Monocyte infiltration into the arterial wall may lead to proteolytic degradation and aneurysm formation.