Journal of Assisted Reproduction and Genetics

, Volume 24, Issue 9, pp 379–386

What is the role of regulatory T cells in the success of implantation and early pregnancy?

  • Shigeru Saito
  • Tomoko Shima
  • Akitoshi Nakashima
  • Arihiro Shiozaki
  • Mika Ito
  • Yasushi Sasaki
Immunology Updates

DOI: 10.1007/s10815-007-9140-y

Cite this article as:
Saito, S., Shima, T., Nakashima, A. et al. J Assist Reprod Genet (2007) 24: 379. doi:10.1007/s10815-007-9140-y

Abstract

Problem

The immune system is well controlled by the balance between immunostimulation and immunoregulation. CD4+CD25+ regulatory T (Treg) cells and an enzyme called indoleamine-2, 3-dioxygenase (IDO) mediate maternal tolerance of the allogeneic fetus. Treg cells, therefore, may prevent early pregnancy loss due to maternal ‘rejection.’

Methods

The latest understanding of tolerance during pregnancy is reviewed.

Results and conclusions

Recent data show that CD4+CD25+ Treg cells play essential roles in the induction and maintenance of tolerance, and that they augment the IDO activity in dendritic cells and macrophages. Therefore, CD4+CD25+ Treg cells and IDO enzyme may cooperate in the induction of tolerance during pregnancy. Treg deficiency is associated with very early post-implantation loss and spontaneous abortion in animal models, and low Treg levels are associated with recurrent miscarriages in humans.

Keywords

CD4+CD25+ regulatory T cellCTLA-4DeciduaIDOMiscarriagePreeclampsia

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Shigeru Saito
    • 1
    • 2
  • Tomoko Shima
    • 1
  • Akitoshi Nakashima
    • 1
  • Arihiro Shiozaki
    • 1
  • Mika Ito
    • 1
  • Yasushi Sasaki
    • 1
  1. 1.Department of Obstetrics and GynecologyUniversity of ToyamaToyamaJapan
  2. 2.Center of Excellence (COE) 21st ProgramMoriokaJapan