Induction of autoimmunity after allotransplantation

Area of Science:

• Immunology
• Transplantation Biology
• Autoimmunity

Background:

• Transplant rejection is a major clinical challenge.
• The role of autoimmunity in transplant rejection is not fully understood.

Purpose of the Study:

• To investigate the role of autoreactive T cells and autoantibodies in transplant rejection.
• To explore the mechanisms by which alloresponses trigger autoimmunity.
• To assess the therapeutic potential of tolerance induction to autoantigens.

Main Methods:

• Detection of autoreactive T cells and autoantibodies against collagen (V) and cardiac myosin post-transplantation.
• Analysis of T cell clonal expansion in response to alloantigens.
• Assessment of transplant survival and pathogenesis following tolerance induction to autoantigens.

Main Results:

• Activated autoreactive T cells and autoantibodies to collagen (V) and cardiac myosin were detected after lung and heart transplantation.
• T cell activation occurred post-alloresponse and could independently induce rejection.
• Indirect alloresponse, potentially via antigen mimicry or release of sequestered autoantigens, triggered autoimmunity.
• Tolerance induction to cardiac myosin and collagen (V) improved allograft survival and reduced pathogenesis.

Conclusions:

• Alloresponses to donor MHC antigens trigger a cascade of events, including autoimmunity to tissue antigens, which is crucial for transplant rejection.
• Targeting autoimmune responses to self-antigens like collagen (V) and cardiac myosin offers a potential strategy for improving transplant outcomes.