Chronic endometritis modifies decidualization in human endometrial stromal cells

Area of Science:

• Reproductive biology
• Endocrinology
• Cellular and molecular medicine

Background:

• Chronic endometritis (CE) is a uterine inflammation often asymptomatic.
• While previously underestimated, CE is increasingly linked to reproductive issues like implantation failure and recurrent miscarriages.
• Decidualization is critical for pregnancy, making its potential disruption by CE a significant concern.

Purpose of the Study:

• To investigate the impact of chronic endometritis on the decidualization process in human endometrial stromal cells (ESCs).
• To explore how CE influences the expression of key decidualization markers and sex hormone receptors.

Main Methods:

• Endometrial stromal cells (ESCs) from CE patients and controls were cultured for 13 days.
• Decidualization markers (prolactin and IGFBP-1) were analyzed via ELISA, Western blotting, and RT-PCR.
• Expression of estrogen and progesterone receptors (ERα, ERβ, PRA, PRB) was assessed using immunohistochemistry.

Main Results:

• ESCs from CE patients showed increased cell proliferation but reduced secretion of prolactin (PRL) and insulin-like growth factor binding protein-1 (IGFBP-1).
• Decreased protein and mRNA levels of PRL and IGFBP-1 were observed in CE patients' ESCs.
• CE patients exhibited altered expression of sex hormone receptors (ERα, ERβ, PRA, PRB) in endometrial stromal and glandular cells.

Conclusions:

• Chronic endometritis significantly alters the decidualization process in human ESCs.
• The observed changes in decidualization markers and sex hormone receptor function suggest a mechanism by which CE may negatively impact female reproduction.