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Related Experiment Videos

Cellular distribution of complement receptor type 4 (CR4): expression on human platelets.

D P Vik, D T Fearon

    Journal of Immunology (Baltimore, Md. : 1950)
    |January 1, 1987
    PubMed
    Summary
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    Platelets express complement receptor type 4 (CR4), which binds C3dg. Platelets can transfer this C3dg binding ability to monocytes, aiding immune complex localization.

    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Neutrophils express complement receptor type 4 (CR4), a C3dg receptor distinct from CR2.
    • The distribution and function of CR4 on other peripheral blood cells remain largely uncharacterized.

    Purpose of the Study:

    • To investigate the presence and characteristics of C3dg binding activity on various peripheral blood cell types.
    • To elucidate the role of platelets in mediating C3dg binding to monocytes.

    Main Methods:

    • Indirect immunofluorescence and flow cytometry were used to detect C3dg binding.
    • Radioligand binding assays with 125I-labeled C3dg were performed on platelets.
    • Platelet-monocyte complexes were generated to assess C3dg binding transfer.

    Main Results:

    Related Experiment Videos

    • Neutrophils, platelets, and B lymphocytes specifically bound C3dg.
    • Purified monocytes did not bind C3dg, but C3dg binding was observed in mixed populations with platelets.
    • Platelet CR4 binding of C3dg was saturable and competitively inhibited by C3dg, iC3b, and C3b.

    Conclusions:

    • Platelets possess CR4, mediating C3dg binding and potentially facilitating immune complex localization.
    • Platelets can confer C3dg binding capacity to monocytes via platelet-monocyte complex formation.