Unlocking the Uterine Code: Microbiota, Immune Cells, and Therapy for Recurrent Reproductive Failure.

Area of Science:

• Reproductive Immunology
• Microbiome Research
• Gynecologic Health

Background:

• The uterine microbiota's role in reproductive health is under investigation.
• Endometrial receptivity and immune tolerance are crucial for successful pregnancy.
• Microbiota imbalances (dysbiosis) may impact fertility and pregnancy outcomes.

Purpose of the Study:

• To analyze endometrial microbiota patterns in patients with recurrent implantation failure (RIF) and recurrent pregnancy loss (RPL).
• To investigate the relationship between endometrial microbiota and immune cells in the female reproductive tract.
• To explore the link between microbiota, immune cells, and chronic endometritis (CE).

Main Methods:

• Flow cytometry was used to examine immune cells in endometrial biopsies from RIF and RPL patients.
• Real-time polymerase chain reaction (RT-PCR) analyzed endometrial microbial composition.
• Biopsies were collected from 107 RIF patients and 93 RPL patients.

Main Results:

• Most women with RIF and RPL exhibited disrupted endometrial microbiota.
• Significant alterations were observed in lymphocytes, T cells, and uterine natural killer (uNK) cells.
• The findings suggest a connection between microbiota dysbiosis and immune cell dysregulation.

Conclusions:

• Endometrial microbiota disruption is prevalent in women experiencing RIF and RPL.
• These microbial imbalances are associated with changes in endometrial immune cell populations.
• Understanding this interplay may offer new strategies for improving women's reproductive health and pregnancy outcomes.