Facilitating cells: role in inducing transplantation tolerance

Area of Science:

• Immunology
• Transplantation Science
• Cell Biology

Background:

• Facilitating cells are heterogeneous subpopulations that enhance stem cell engraftment in allogeneic recipients.
• These cells increase hematopoietic stem cell (HSC) clonogenicity, migration, homing, and prevent apoptosis.
• They also play a role in inducing regulatory cells, crucial for immune tolerance.

Purpose of the Study:

• To review the mechanisms by which facilitating cells promote stem cell engraftment and induce tolerance in kidney transplant recipients.
• To summarize findings leading to the development of chimerism-based tolerance induction using FCRx therapy.
• To highlight the potential of FCRx therapy in achieving tolerance without immunosuppression.

Main Methods:

• Review of existing literature on facilitating cells and their role in stem cell engraftment and tolerance.
• Analysis of findings from preclinical studies in mice and human subjects.
• Examination of results from a phase-2 clinical trial utilizing FCRx therapy in kidney transplant patients.

Main Results:

• Facilitating cells, a heterogeneous group, enhance stem cell engraftment and function.
• FCRx therapy, a product enriched in stem cells and facilitating cells, has shown success in inducing tolerance.
• A phase-2 trial demonstrated successful immunosuppression withdrawal in over 70% of kidney transplant recipients treated with FCRx.

Conclusions:

• Facilitating cells are key players in promoting stem cell engraftment and immune tolerance.
• FCRx therapy represents a promising approach for achieving long-term tolerance in kidney allograft recipients.
• The ultimate goal of establishing tolerance without immunosuppressive drugs is attainable with FCRx therapy.