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Structure and function of the human C3b receptor.

D T Fearon

    Federation Proceedings
    |July 1, 1984
    PubMed
    Summary

    The human C3b receptor (C3bR) is a genetically regulated glycoprotein. Variations in C3bR expression and function may contribute to immune complex disorders like lupus and glomerulonephritis.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Genetics

    Background:

    • The human C3b receptor (C3bR) is a polymorphic glycoprotein with varying expression levels.
    • Its genetic regulation and functional roles in immune responses are critical.
    • C3bR plays a role in immune complex clearance and cellular interactions.

    Purpose of the Study:

    • To investigate the structural and genetic variations of the human C3b receptor (C3bR).
    • To explore the functional significance of C3bR in immune cell activation and immune complex processing.
    • To examine the potential contribution of C3bR abnormalities to autoimmune diseases.

    Main Methods:

    • Analysis of C3bR allotypic forms and molecular weight.
    • Investigation of genetic regulation of C3bR expression on erythrocytes.
    • In vitro studies on neutrophil C3bR induction by C5a and C5ades Arg.
    • Experiments assessing cytoskeletal association and receptor-mediated phagocytosis.
    • Evaluation of C3bR cofactor activity in C3b cleavage.
    • Clinical correlation of C3bR deficiency with systemic lupus erythematosus and glomerulonephritis.

    Main Results:

    • C3bR exists in two allotypic forms (F and S) with distinct molecular weights.
    • Erythrocyte C3bR numbers are genetically controlled by codominant alleles.
    • Neutrophil C3bR expression increases upon stimulation with C5a and C5ades Arg.
    • Evidence suggests cytoskeletal association of C3bR on monocytes and neutrophils.
    • C3bR exhibits cofactor activity, promoting C3b degradation.
    • Partial deficiency of erythrocyte C3bR and absence of glomerular C3bR are observed in patients with SLE and proliferative glomerulonephritis.

    Conclusions:

    • C3bR exhibits structural and genetic polymorphism influencing its function.
    • C3bR plays a role in immune cell activation and immune complex clearance.
    • Deficiencies in C3bR may be implicated in the pathogenesis of systemic lupus erythematosus and glomerulonephritis.

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