Alloreactive T-cell

Alloreactive T-cells are a subset of T lymphocytes that recognize and respond to alloantigens—antigens from genetically distinct individuals of the same species, most notably those presented by mismatched major histocompatibility complex (MHC) molecules. These cells play a central role in mediating immune responses against transplanted tissues and organs, leading to graft rejection or graft-versus-host disease. They recognize foreign MHC-peptide complexes on donor antigen-presenting cells (APCs) via their T cell receptors (TCRs). Their activation leads to proliferation, cytokine production, cytotoxicity, and recruitment of other immune effectors that can damage or destroy allogeneic tissue. There are three main pathways by which alloreactive T-cells recognize donor antigens after transplantation: direct, indirect and semi-direct pathway. Their frequency correlates with clinical outcomes such as graft survival or failure; strategies targeting these cells aim either at depleting them or inducing tolerance for successful transplantation outcomes.

Other names

Allo-reactive T cellAlloreactive T lymphocyte

Varied, depending on the drug. Includes T cell depletion, inhibition of T cell activation signaling pathways, and blockade of co-stimulatory molecules.