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Immunologic and endocrine interrelationships in pregnancy

P K Siiteri, D P Stites

    Biology of Reproduction
    |February 1, 1982
    PubMed
    Summary

    Pregnancy hormones, particularly progesterone, suppress the maternal immune system, preventing rejection of the fetus. This local immunosuppression allows for successful fetal development and immune tolerance.

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    Area of Science:

    • Reproductive Immunology
    • Endocrinology
    • Maternal-Fetal Medicine

    Background:

    • The maternal immune system must tolerate fetal allograft (paternal antigens).
    • Hormonal regulation is crucial for maintaining pregnancy and preventing immune rejection.

    Purpose of the Study:

    • To investigate the role of pregnancy hormones in modulating the maternal immune response to fetal antigens.
    • To identify progesterone as a key immunosuppressive hormone at the maternal-placental interface.

    Main Methods:

    • Review of existing literature on hormonal effects on immune cells.
    • Analysis of progesterone's known immunosuppressive properties.
    • Consideration of local versus systemic hormonal effects.

    Main Results:

    • Progesterone exhibits significant immunosuppressive properties, including anti-inflammatory and graft-sparing effects.
    • Progesterone inhibits lymphocyte activation, killer T cell generation, and monocyte-macrophage activity.
    • High local concentrations of progesterone at the placenta are critical for immunosuppression.

    Conclusions:

    • Progesterone is a key hormone downregulating maternal immune responses against the fetus.
    • Local placental progesterone concentrations are vital for preventing fetal graft rejection.
    • Further research should focus on uterine-specific progesterone actions and their role in early pregnancy.

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