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Related Experiment Videos

Fibronectin is produced by human macrophages

K Alitalo, T Hovi, A Vaheri

    The Journal of Experimental Medicine
    |March 1, 1980
    PubMed
    Summary

    Human macrophages synthesize fibronectin during differentiation. This fibronectin is primarily intracellular and may function as an opsonin, aiding cell adhesion and migration in tissues.

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    Area of Science:

    • Cell Biology
    • Immunology

    Background:

    • Monocytes differentiate into macrophages, key immune cells involved in tissue repair and inflammation.
    • Fibronectin is a crucial extracellular matrix protein involved in cell adhesion and migration.

    Purpose of the Study:

    • To investigate fibronectin synthesis and secretion by human monocyte-derived macrophages.
    • To characterize the cellular localization and potential functions of macrophage-derived fibronectin.

    Main Methods:

    • Preparation of monocyte-enriched cultures from human blood mononuclear leukocytes.
    • Detection of fibronectin synthesis using metabolic labeling, immunoprecipitation, gel electrophoresis, radioimmunoassay, and immunofluorescence.
    • Assessment of collagenous protein production.

    Main Results:

    • Fibronectin synthesis and secretion were observed during macrophage differentiation, starting on days 3-5.
    • Fibronectin was predominantly detected intracellularly, with minimal pericellular presence.
    • No collagenous protein production was detected in these macrophage cultures.

    Conclusions:

    • Human macrophages actively produce fibronectin during their differentiation process.
    • Intracellular fibronectin in macrophages may play a role in opsonization and promoting cell adhesion during migration.
    • Macrophages are a source of fibronectin, contributing to tissue homeostasis and immune responses.

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