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Updated: May 24, 2025

Isolation of Leukocytes from the Murine Tissues at the Maternal-Fetal Interface

Isolation of Leukocytes from the Murine Tissues at the Maternal-Fetal Interface

Published on: May 21, 2015

Deciphering immune tolerance in allogeneic pig pregnancy.

Josep M Cambra¹, Cristina A Martinez-Serrano², Heriberto Rodriguez-Martinez³

¹Large Animal Models in Cardiovascular Research, Internal Medical Department I, TU Munich, 81675, Munich, Germany.

|March 2, 2025

Summary

Embryo transfer success in pigs depends on the maternal immune response. Poor outcomes link to inflammation and fewer regulatory T cells (Tregs), while good outcomes show enhanced tolerance, crucial for reproductive efficiency.

Keywords:

Allogeneic pregnancies Embryo transfer Macrophages NK cells Pig T lymphocytes T regulatory

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Area of Science:

Reproductive immunology
Swine biotechnology
Maternal-fetal interface immunology

Background:

Embryo transfer (ET) is vital for swine biotechnology but faces inconsistent success.
Immune responses at the maternal-fetal interface significantly impact ET outcomes.
Understanding these immune dynamics is key to improving swine reproductive efficiency.

Purpose of the Study:

To compare the endometrial immune environment in hemi-allogeneic (artificial insemination) versus allogeneic (ET) pregnancies in pigs.
To investigate the role of immune cell populations in embryo survival during ET.
To identify immunological factors influencing the success of swine embryo transfer.

Main Methods:

Analysis of endometrial immune cell populations (T lymphocytes, T_regs, NK cells, macrophages) via immunohistochemistry.
Categorization of sows based on pregnancy type (hemi-allogeneic vs. allogeneic) and fetal count.
Comparison of immune profiles between pregnancies with varying outcomes.

Main Results:

Allogeneic pregnancies with poor outcomes showed increased natural killer (NK) cells and macrophages, and decreased regulatory T cells (T_regs).
This suggests a pro-inflammatory environment associated with lower embryo survival in ET.
Favorable allogeneic pregnancies exhibited immune profiles similar to hemi-allogeneic pregnancies, indicating enhanced maternal-fetal tolerance.

Conclusions:

Immunological variability significantly affects embryo survival rates in swine ET.
NK cells, macrophages, and T_regs are critical cellular targets for improving ET success.
Further research into immunomodulatory strategies is essential for optimizing swine reproduction via ET.