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Tubular secretion and reabsorption are two critical processes in the nephron tubule of the kidneys. When the fluid filtered from the glomerulus enters the proximal convoluted tubule, it is referred to as filtrate, and its composition changes due to tubular reabsorption and secretion.
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Protease-Binding Activity of Limulus α2-Macroglobulin.

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A Hemolytic Activity in the Blood of the American Horseshoe Crab, Limulus polyphemus that Resembles the Mammalian Complement System.

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Antimicrobial Activity of Limulus Blood: Role of C-Reactive Protein (CRP) and Limulus Anti-Lipopolysaccharide Factor (LALF).

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Updated: Feb 15, 2026

Blood Collection from the American Horseshoe Crab, Limulus Polyphemus
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The Limulus Blood Cell Secretes α2-Macroglobulin When Activated.

P B Armstrong, J P Quigley, F R Rickles

    The Biological Bulletin
    |January 10, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Alpha2-macroglobulin, a key protease-binding protein in horseshoe crab plasma, is also found within their blood cells. This protein is released during cell degranulation, playing a role in immune responses.

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    Area of Science:

    • Biochemistry
    • Immunology
    • Marine Biology

    Background:

    • Alpha2-macroglobulin is a broad-spectrum protease inhibitor found in various organisms.
    • Horseshoe crab plasma contains high concentrations of alpha2-macroglobulin, crucial for its innate immunity.
    • The presence and function of alpha2-macroglobulin within horseshoe crab blood cells remain less understood.

    Purpose of the Study:

    • To investigate the presence and characteristics of alpha2-macroglobulin within horseshoe crab blood cells.
    • To determine if cell-associated alpha2-macroglobulin is released during cellular activation.
    • To compare the properties of plasma and cell-derived alpha2-macroglobulin.

    Main Methods:

    • Protease inhibition assays using trypsin and soybean trypsin inhibitor.
    • Immunochemical detection via Western blotting with specific antiserum.
    • Stimulation of blood cell exocytosis using the ionophore A23187.
    • Analysis of subunit molecular weight via SDS-PAGE.

    Main Results:

    • Alpha2-macroglobulin was confirmed in horseshoe crab plasma and demonstrated to protect trypsin activity.
    • Cell-associated alpha2-macroglobulin was identified and released upon stimulation of exocytosis.
    • The subunit molecular weight (185 kDa) of cell-associated alpha2-macroglobulin is identical to the plasma form.
    • Limulus amebocyte lysate preparations contain significant amounts of active alpha2-macroglobulin.

    Conclusions:

    • Horseshoe crab blood cells store and release active alpha2-macroglobulin.
    • Cell-derived alpha2-macroglobulin shares identical subunit molecular weight with its plasma counterpart.
    • Alpha2-macroglobulin is a significant component of horseshoe crab amebocyte lysate, potentially contributing to its endotoxin-detecting capabilities.