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Updated: Dec 27, 2025

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Isolation of Uterine Innate Lymphoid Cells for Analysis by Flow Cytometry
Published on: October 14, 2021
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Hormonally controlled ILC antigen presentation potential is reduced during pregnancy
Rebekka Einenkel1, Jens Ehrhardt1, Kristin Hartmann1
1Department of Obstetrics and Gynecology, University of Greifswald, Greifswald, Germany.
Summary
Innate lymphoid cells (ILCs) adapt their antigen presentation during pregnancy. Uterine ILCs reduce antigen presentation, helping to maintain immune tolerance and support fetal development.
Area of Science:
- Immunology
- Reproductive Biology
- Cell Biology
Background:
- Innate lymphoid cells (ILCs) are crucial at mucosal barriers for immune homeostasis.
- ILCs are present at the fetomaternal interface, essential for successful semi-allogeneic pregnancy.
- Pregnancy requires a finely tuned immune environment to prevent fetal rejection.
Purpose of the Study:
- To investigate the antigen presentation capacity of ILCs during pregnancy.
- To determine how ILCs adapt their immune function in the unique uterine environment.
- To explore the role of ILCs in maintaining pregnancy tolerance.
Main Methods:
- Analysis of human decidual and peripheral blood ILCs.
- In vitro studies using human ILCs and pregnancy-related factors.
- Utilized a mouse model of normal and complicated pregnancy (CBA/J × DBA/2J POPM).
- Characterized ILC antigen presentation using flow cytometry and qPCR.
Main Results:
- ILC subset distribution changed during human and murine pregnancy.
- MHCII expression on ILCs varied: reduced in normal mouse pregnancy, increased in complicated pregnancy.
- In vitro, uterine ILCs showed lower MHCII expression, unaffected by stimulation.
- Pregnancy hormones in vitro reduced human ILC antigen presentation capacity.
Conclusions:
- Peripheral and uterine ILCs adapt their antigen presentation during pregnancy.
- ILC adaptation supports immune tolerance and successful pregnancy.
- ILCs play a key role in modulating the maternal immune response to the fetus.
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