Mesenchymal stem cells enhance Treg immunosuppressive function at the fetal-maternal interface

Area of Science:

• Immunology
• Reproductive Biology
• Cell Therapy

Background:

• Maternal-fetal immune tolerance is crucial for successful pregnancy.
• Immune dysregulation, particularly in the decidua, is linked to adverse outcomes like recurrent spontaneous abortion (RSA).
• Mesenchymal stromal cells (MSCs) and regulatory T cells (Tregs) show potential in treating immune-related RSA, but their interaction is unclear.

Purpose of the Study:

• To investigate the cross-talk between MSCs and Tregs at the fetal-maternal interface.
• To determine if MSCs can modulate the function of decidual Tregs (dTregs).
• To evaluate the therapeutic potential of MSCs and MSC-induced Tregs in preclinical models of abortion.

Main Methods:

• Co-culture of umbilical MSCs with decidual immune cells.
• Analysis of Treg expansion and function (IL-10, TGF-β production).
• In vivo studies using LPS-induced and spontaneous abortion mouse models with MSC adoptive transfer.

Main Results:

• Umbilical MSCs induced the expansion of decidual Foxp3+CD4+ T cells, increasing IL-10 and TGF-β production.
• MSCs enhanced the immune suppressive functions of decidual Tregs (dTregs).
• MSC treatment increased Treg accumulation and ameliorated abortion rates in mouse models.

Conclusions:

• MSCs promote the expansion and suppressive function of decidual Tregs.
• MSC-instructed Tregs exhibit enhanced capacity to mitigate Th1/Th17 inflammatory responses.
• This study provides a new perspective on using MSCs and Tregs for clinical management of recurrent miscarriage.