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Indoleamine 2,3-dioxygenase: distribution and function in the developing human placenta.

Yoshiki Kudo1, C A R Boyd, Isabella Spyropoulou

  • 1Department of Human Anatomy and Genetics, University of Oxford, Oxford, UK. yoshkudo@hiroshima-u.ac.jp

Journal of Reproductive Immunology
|April 6, 2004
PubMed
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The human placenta utilizes indoleamine 2,3-dioxygenase (IDO) to deplete tryptophan, a mechanism that helps regulate the maternal immune response and prevent rejection of the conceptus during pregnancy.

Area of Science:

  • Reproductive Immunology
  • Maternal-Fetal Interface Biology
  • Trophoblast Biology

Background:

  • Mouse studies suggest placental immune protection involves tryptophan depletion by indoleamine 2,3-dioxygenase (IDO).
  • The presence and function of IDO in the human placenta remain to be fully elucidated.
  • Understanding these mechanisms is crucial for comprehending maternal immune tolerance.

Purpose of the Study:

  • To investigate the immunohistochemical and functional significance of IDO in the human placenta.
  • To determine if IDO-mediated tryptophan depletion plays a role in regulating the maternal immune response at the maternal-fetal interface.

Main Methods:

  • Immunohistochemical analysis of IDO expression in human placental tissues throughout pregnancy.
  • Functional assays using villous explants to assess IDO activity in response to interferon-gamma.

Related Experiment Videos

  • Inhibition studies using 1-methyl-tryptophan to block IDO activity.
  • Assessment of peripheral blood mononuclear cell proliferation in relation to IDO activity.

    • Main Results:

    • IDO is expressed in human placental cells (syncytiotrophoblasts, extravillous cytotrophoblasts, macrophages) from early blastocyst stage through pregnancy.
    • Interferon-gamma significantly enhances IDO expression in placental macrophages.
    • IDO-mediated tryptophan degradation in first-trimester tissues is stimulated by interferon-gamma and inhibited by 1-methyl-tryptophan.
    • IDO-mediated tryptophan depletion regulates peripheral blood mononuclear cell proliferation.

    Conclusions:

    • IDO is present and functionally active in the human placenta, particularly in macrophages.
    • IDO-mediated tryptophan depletion represents a key mechanism for regulating maternal immune responses at the maternal-fetal interface.
    • This mechanism likely contributes to immune tolerance and successful pregnancy outcome.