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Biocompatibility of silicone implants.

J P Heggers, N Kossovsky, R W Parsons

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    Silicone implants may trigger a cellular immune response, challenging the notion of immunological inertness. Research indicates immune cells process silicone, suggesting a potential antigen-antibody reaction.

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    Area of Science:

    • Immunology
    • Biomaterials Science
    • Cell Biology

    Background:

    • Polydimethylsiloxane (silicone) is widely believed to be immunologically inert.
    • Previous studies suggested no circulating antibodies are produced following silicone implantation.

    Purpose of the Study:

    • To investigate the potential for a cellular immune response to implanted polydimethylsiloxane.
    • To explore the immunological interactions between silicone biomaterials and host immune cells.

    Main Methods:

    • Histological examination of tissue response in sensitized guinea pigs.
    • Electron microscopy (EM) and X-ray emission spectroscopy (XES) to detect intracellular silicon.
    • Macrophage migration inhibition assays to assess cellular immune activity.

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    Main Results:

    • Histology revealed a cellular response consistent with a cellular immune reaction in sensitized animals.
    • Intracellular silicon was detected within macrophages and lymphocytes, suggesting cellular processing.
    • Macrophage migration inhibition provided evidence of a cellular immune phenomenon.

    Conclusions:

    • Implanted polydimethylsiloxane may elicit a cellular immune response, contrary to previous assumptions.
    • Immune cells appear to process silicon-containing complexes, indicating a potential antigenic role.
    • Further research is needed to characterize the sensitizing complex and confirm findings in vivo.