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Binding sites for immunoglobulin G in rabbit ciliary processes

N S Peress, V A Roxburgh, M C Gelfand

    Investigative Ophthalmology & Visual Science
    |October 1, 1982
    PubMed
    Summary

    Rabbit eyes show specific binding of the Fc fragment of immunoglobulin G (IgG) on ciliary processes. This Fc IgG binding activity may trap immune components within the eye.

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    Area of Science:

    • Ocular immunology
    • Immunohistochemistry
    • Ophthalmology

    Background:

    • The Fc fragment of immunoglobulin G (IgG) plays a crucial role in immune responses.
    • Specific binding sites for Fc IgG have been identified in various tissues, including the choroid plexus and renal interstitium.
    • The presence and function of Fc IgG binding in ocular tissues, particularly the ciliary processes, remain largely unexplored.

    Purpose of the Study:

    • To investigate the presence and localization of selective binding activity for the Fc fragment of IgG on ocular tissues in rabbits.
    • To determine if ciliary processes exhibit intrinsic binding capacity for Fc IgG.
    • To explore the potential role of this binding activity in the local immune surveillance of the eye.

    Main Methods:

    • In vitro binding assays using frozen sections of whole rabbit eyes.
    • Incubation of tissue sections with IgG-coated sheep red blood cells (IgGEA).
    • Assessment of IgGEA adherence specifically to the ciliary processes, with other ocular tissues serving as controls.
    • Competitive inhibition assays using IgG, albumin, and F(ab')2 fragments to confirm binding specificity.

    Main Results:

    • Selective binding activity for the Fc fragment of IgG was demonstrated on the ciliary processes of rabbit eyes.
    • Ocular tissues including the cornea, iris, choroid, and retina showed no significant binding activity.
    • IgGEA binding to ciliary processes was specifically inhibited by IgG and not by albumin or the F(ab')2 fragment, confirming Fc IgG specificity.
    • The binding was observed in vitro on frozen sections, indicating intrinsic activity within the ciliary processes.

    Conclusions:

    • The ciliary processes of the rabbit eye possess intrinsic selective binding activity for the Fc fragment of IgG.
    • This Fc IgG binding capacity in the ciliary processes may contribute to the local entrapment of immune components.
    • Potential implications for immune component regulation within the aqueous humor and circulation of the eye.

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