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Related Experiment Videos

Hormone-like activity of human thrombin.

R Bar-Shavit, K A Hruska, A J Kahn

    Annals of the New York Academy of Sciences
    |January 1, 1986
    PubMed
    Summary

    Thrombin acts as a non-enzymatic chemoattractant and mitogen for mononuclear phagocytes, specifically monocytes. Its effects on cell movement and replication involve distinct molecular sites, highlighting its diverse biological roles.

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    Area of Science:

    • Cellular and Molecular Biology
    • Hematology
    • Biochemistry

    Background:

    • Thrombin, traditionally known for its enzymatic role in coagulation, also exhibits non-enzymatic activities.
    • Previous research indicated thrombin's potential as a chemoattractant and growth promoter for mononuclear phagocytes.
    • The specificity of thrombin's action, particularly towards monocytes, warranted further investigation.

    Purpose of the Study:

    • To investigate the cellular specificity of thrombin's non-enzymatic chemotactic and mitogenic activities.
    • To explore the molecular mechanisms underlying thrombin's effects on monocyte differentiation and proliferation.
    • To differentiate the signaling pathways involved in thrombin-induced cell movement versus cell growth.

    Main Methods:

    • Utilized the human leukemia cell line HL-60, differentiated into monocyte-like (HL-60/mono) and granulocyte-like (HL-60/gran) cells.
    • Assessed chemotactic responses to intact thrombin, enzymatically inactive thrombin (iPR2P-alpha-thrombin), and a thrombin-derived peptide (CB67-129).
    • Measured actin-cytoskeleton association, intracellular calcium (Ca2+) levels, [3H]TdR incorporation, protein synthesis, and cell replication in response to thrombin and its derivatives.

    Main Results:

    • HL-60/mono cells exhibited chemotaxis towards intact thrombin, iPR2P-alpha-thrombin, and CB67-129, unlike undifferentiated or HL-60/gran cells.
    • Thrombin induced actin-cytoskeleton association and increased cytosolic Ca2+ in HL-60/mono cells, indicative of chemotactic signaling.
    • iPR2P-alpha-thrombin and CB67-129 stimulated DNA synthesis, protein synthesis, and cell replication in J-744 macrophage-like cells.
    • Tryptic digestion of CB67-129 dissociated chemotactic from mitogenic activity, suggesting distinct functional sites.
    • A synthetic peptide mimicking the loop B insertion sequence of CB67-129 retained mitogenic activity, implicating this region in non-enzymatic effects.

    Conclusions:

    • Thrombin's non-enzymatic activities, including chemotaxis and mitogenesis, are specific to mononuclear phagocytes.
    • The loop B insertion sequence is critical for thrombin's non-enzymatic biological effects, but distinct sites mediate chemotaxis and mitogenesis.
    • These findings reveal the complex, dual role of thrombin in cellular processes beyond coagulation.

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