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CSF1-associated decrease in endometrial macrophages may contribute to Asherman's syndrome.

Dan Liu1, Jiali Wang2, Guangfeng Zhao1

  • 1Department of Obstetrics and Gynecology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China.

American Journal of Reproductive Immunology (New York, N.Y. : 1989)
|September 20, 2019
PubMed
Summary
This summary is machine-generated.

Reduced macrophages in Asherman's syndrome (AS) patients may stem from lower CSF1 levels. Modulating macrophage function could offer new therapeutic strategies for AS, a condition causing endometrial fibrosis and infertility.

Keywords:
Asherman's syndromeCSF1fibrosismacrophage

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Area of Science:

  • Reproductive Biology
  • Immunology
  • Fibrosis Research

Background:

  • Asherman's syndrome (AS) involves endometrial fibrosis, leading to intrauterine adhesions, hypomenorrhea, infertility, and recurrent pregnancy loss.
  • Macrophages are crucial in inflammation, tissue repair, regeneration, and fibrosis, but their specific role in AS is not well understood.

Purpose of the Study:

  • To investigate the role of macrophages in the endometrial fibrosis characteristic of Asherman's syndrome.
  • To explore the relationship between macrophage populations, CSF1 expression, and endometrial repair markers in AS.

Main Methods:

  • Analysis of endometrial biopsies from AS patients and controls, assessing fibrosis, proliferation, and macrophage markers via Masson's trichrome staining, immunohistochemistry, and flow cytometry.
  • Quantitative real-time PCR and immunohistochemistry were used to measure expression levels of CCL2, CSF1, CSF1R, and GM-CSF.
  • In vitro studies utilized the Ishikawa (IK) endometrial cell line and IL-4/IL-13 polarized macrophages (M(IL-4/13)-S) to assess effects on cell growth, apoptosis, and fibrosis.

Main Results:

  • AS patients exhibited endometrial stromal fibrosis and reduced cell proliferation.
  • A significant decrease in the number of alternative activated macrophages was observed in AS patients, correlated with reduced CSF1 expression.
  • M(IL-4/13)-S promoted IK cell growth and migration, inhibited H2O2-induced apoptosis, and protected against bleomycin-induced fibrosis.

Conclusions:

  • Macrophages play a critical role in endometrial repair and fibrosis processes.
  • Reduced endometrial macrophage numbers in AS may be linked to decreased CSF1 expression.
  • Targeting macrophage activation and function presents a potential novel therapeutic avenue for Asherman's syndrome.