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Related Experiment Video

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Isolation of Leukocytes from the Human Maternal-fetal Interface
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M1 macrophages decrease in the deciduae from normal pregnancies but not from spontaneous abortions or unexplained

Fang-Yu Tsao1, Ming-Yih Wu2, Yih-Leong Chang3

  • 1Graduate Institute of Immunology, College of Medicine, National Taiwan University, Taipei, Taiwan.

Journal of the Formosan Medical Association = Taiwan Yi Zhi
|May 4, 2017
PubMed
Summary

M2 macrophages are crucial for successful early human pregnancies. Their abundance in the luteal phase and normal pregnancies contrasts with M1 macrophage prevalence in spontaneous abortions and unexplained recurrent spontaneous abortions (RSAs).

Keywords:
M1/M2 macrophagesdecidual macrophagesmaternal immunomodulationrecurrent spontaneous abortionspontaneous abortions

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Area of Science:

  • Immunology
  • Reproductive Biology
  • Cell Biology

Background:

  • Macrophage polarization into M1 (pro-inflammatory) and M2 (anti-inflammatory/tissue repair) phenotypes plays a role in reproductive outcomes.
  • Understanding macrophage dynamics in the endometrium and decidua is essential for elucidating pregnancy pathologies.

Purpose of the Study:

  • To investigate the M1/M2 macrophage polarity in the endometrium during different menstrual phases.
  • To compare macrophage polarization in normal pregnancies versus abnormal pregnancies, including spontaneous abortions and unexplained recurrent spontaneous abortions (RSAs).

Main Methods:

  • Endometrial tissues from follicular and luteal phases and first-trimester decidual tissues from normal and abnormal pregnancies were analyzed.
  • Immunofluorescence was employed to quantify M1 and M2 macrophages in endometrial and decidual samples.

Main Results:

  • M1 macrophages were predominantly found in spontaneous abortions and unexplained RSAs.
  • M2 macrophages were significantly more frequent in the luteal phase endometrium and normal pregnancies.

Conclusions:

  • M2 macrophage polarization is vital for successful early human pregnancy.
  • Imbalances in macrophage polarization may contribute to the pathophysiology of pregnancy loss.