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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

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The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
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Related Experiment Video

Updated: May 5, 2026

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

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A unique elastase in human blood platelets.

H L James, Y T Wachtfogel, P L James

    The Journal of Clinical Investigation
    |December 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Platelets contain a unique elastase, distinct from neutrophil elastase. This platelet elastase shows different substrate preferences and inhibitor responses, confirming its distinct identity in blood platelets.

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    Area of Science:

    • Biochemistry
    • Hematology
    • Enzymology

    Background:

    • Platelet elastolytic activity was previously attributed to neutrophil elastase contamination.
    • Distinguishing platelet-specific enzymes is crucial for understanding their biological roles.

    Purpose of the Study:

    • To investigate the nature of elastase-like and elastolytic activity in neutrophils-free platelet lysate.
    • To determine if platelet elastase is identical to neutrophil elastase.

    Main Methods:

    • Assessed elastase-like activity using synthetic substrates (tBOC-ala-ala-pro-ala-aminomethyl coumarin, tBOC-ala-ala-pro-val-aminomethyl coumarin, SAPNA).
    • Measured elastolytic activity on 3H-labeled dog and human lung elastins.
    • Examined substrate specificity, inhibitor profiles (NaCl, alpha 2-macroglobulin, alpha 1-antitrypsin, DFP, PMSF, elastatinal, Trasylol, furoyl-saccharin), and pH optimum.
    • Used IgG specific for neutrophil elastase to assess cross-reactivity.

    Main Results:

    • Platelet lysate degraded substrates differently compared to neutrophil elastase.
    • NaCl inhibited platelet lysate activity but potentiated neutrophil elastase.
    • Plasma alpha 2-macroglobulin inhibited platelet elastase, while alpha 1-antitrypsin did not.
    • Specific inhibitors and optimal pH (8.5-9.0) characterized the platelet activity.
    • Neutrophil elastase-specific IgG did not remove the activity, indicating it's not neutrophil elastase.

    Conclusions:

    • Platelets possess a unique elastase, distinct from neutrophil elastase.
    • This platelet-specific elastase has unique substrate and inhibitor specificities.
    • The findings clarify the source of elastolytic activity in platelets.