Regulatory T cells and transplantation tolerance

Area of Science:

• Immunology
• Transplantation Biology
• Cellular and Molecular Medicine

Background:

• Rodent transplantation models show specific immunological tolerance and indefinite graft survival without ongoing immunosuppression.
• Clinical achievement of this state would mitigate long-term organ grafting risks, including infection, cancer, and immunosuppressant toxicity.

Purpose of the Study:

• To review the interplay between regulatory T cells, dendritic cells, and grafts in maintaining local immune privilege.
• To discuss mechanisms regulating T cell and antigen-presenting cell activity for transplant tolerance.

Main Methods:

• Review of existing literature on immune tolerance in transplantation.
• Analysis of the roles of regulatory T cells and dendritic cells.
• Examination of anti-inflammatory cytokines and negative costimulatory interactions.

Main Results:

• Identified interplay between regulatory T cells, dendritic cells, and graft microenvironment.
• Highlighted the role of anti-inflammatory cytokines and negative costimulatory signals.
• Described coordinated local mechanisms for maintaining tolerance.

Conclusions:

• Induction and maintenance of tolerance via acquired local immune privilege are feasible.
• These mechanisms have implications for designing therapeutic regimens.
• Monitoring strategies for patients weaning off immunosuppression can be informed by these findings.