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Monocyte adhesion to subendothelial components.

J W Tobias, M M Bern, P A Netland

    Blood
    |April 1, 1987
    PubMed
    Summary
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    Human monocytes preferentially adhere to laminin and elastin in the subendothelial matrix. Intact, crosslinked elastin is crucial for monocyte binding, highlighting key components in vascular interactions.

    Area of Science:

    • Biomedical Science
    • Cell Biology
    • Vascular Biology

    Background:

    • Human monocytes infiltrate blood vessel walls and bind to the subendothelial basement membrane.
    • Understanding the specific matrix components involved in monocyte adhesion is crucial for vascular biology research.

    Purpose of the Study:

    • To identify the specific components of the subendothelial matrix that mediate human monocyte adhesion.
    • To investigate the molecular requirements for monocyte binding to elastin.

    Main Methods:

    • Quantitative dot-blot adhesion assays were employed to measure monocyte binding to various isolated matrix proteins.
    • Adhesion was tested using fresh human monocytes and established cell lines (U937, HL60).
    • Different forms of elastin, including digests and crosslinks, were used to assess binding requirements.

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    Main Results:

    • Monocytes demonstrated preferential adhesion to immobilized laminin and elastin.
    • Adhesion to fibronectin was less pronounced, and binding to collagen types I, IV, and heparan sulfate was minimal.
    • Monocyte binding to elastin required an intact, crosslinked molecule, with no significant binding to soluble extracts, digests, monomer, or crosslinks.
    • Cell lines U937 and HL60 showed similar adhesion profiles to monocytes, with HL60 exhibiting slightly reduced elastin adhesion.

    Conclusions:

    • Laminin and intact, crosslinked elastin are key components of the subendothelial matrix that promote human monocyte adhesion.
    • These findings provide insights into the molecular mechanisms underlying monocyte recruitment in vascular tissues.
    • The study utilized cell lines to model monocyte-matrix interactions, offering a reproducible system for further investigation.