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Orchidectomy and immune response

J E Castro

    Annals of the Royal College of Surgeons of England
    |September 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Orchidectomy (testicle removal) in mice enhances cell-mediated immunity and tumor resistance, likely due to androgen withdrawal. This impacts thymus and lymph node structure, affecting immune responses.

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    Area of Science:

    • Immunology
    • Endocrinology
    • Oncology

    Background:

    • Orchidectomy, the removal of testes, significantly influences the immune system.
    • The interplay between sex hormones and immune function is complex and warrants further investigation.

    Purpose of the Study:

    • To investigate the structural and functional effects of orchidectomy on lymphoid tissues in mice.
    • To determine the impact of orchidectomy on both cell-mediated and humoral immune responses.
    • To evaluate the influence of orchidectomy on tumor development and transplantation.

    Main Methods:

    • Mice underwent pre- and postpuberal orchidectomy, with some also receiving thymectomy.
    • Immune responses were assessed using skin allograft rejection, sheep red blood cell reactivity, and antibody production assays.

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  • Tumorigenesis and transplantation models, including methylcholanthrene-induced sarcomas and Meth A tumor, were employed.

    • Main Results:

    • Orchidectomy led to thymus hypertrophy and lymph node enlargement, mediated by thymocytes and reversible with androgens.
    • Cell-mediated immunity, including skin allograft rejection and early immune responses, was enhanced.
    • Tumor resistance increased, with prolonged latency for chemically induced tumors and protection against transplanted tumors, while spontaneous leukemia incidence rose.

    Conclusions:

    • Orchidectomy primarily boosts cell-mediated immune responses, not B-cell dependent antibody production.
    • The observed effects are attributed to androgen withdrawal rather than general hormonal milieu changes.
    • Orchidectomy demonstrates a dual role in immunity, enhancing defense against some tumors while potentially increasing susceptibility to others.