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Local active suppression by suppressor cells in the decidua: a review
Summary
Fetal survival depends on local immune cells in the decidua, not systemic suppressors. Trophoblast cells recruit these maternal non-T suppressor cells to protect the fetus from immune attack.
Area of Science:
- Immunology
- Reproductive Biology
- Developmental Biology
Background:
- Maternal immune tolerance of the fetus is crucial for successful pregnancy.
- Systemic immune suppressors like T cells and serum factors are not the primary mechanisms for fetal protection.
Purpose of the Study:
- To investigate the role of local immune cells at the feto-maternal interface in ensuring fetal survival.
- To identify novel suppressor mechanisms involved in allopregnancy.
Main Methods:
- Analysis of immune cell populations in the decidua of allopregnant mice.
- Characterization of decidua-associated suppressor cells.
- Comparison of immune responses in successful pregnancies versus those with xenogeneic embryo resorption.
Main Results:
- A novel, non-MHC specific suppressor cell population was identified in the decidua of successfully pregnant mice.
- These decidua-associated suppressor cells are distinct from T cells and possess cytoplasmic granules.
- These suppressor cells were deficient in mice carrying xenogeneic embryos that were subsequently resorbed.
- Trophoblast cells appear to recruit bone-marrow derived, non-T suppressor cells to the decidua.
Conclusions:
- Local decidua-associated suppressor cells, recruited by trophoblast cells, play a critical role in protecting the fetus from maternal immune attack.
- This local immune regulation is essential for successful mammalian pregnancy.