T Cell Costimulatory Pathway

The T cell costimulatory pathway encompasses a network of receptor-ligand interactions crucial for orchestrating adaptive immunity. It provides secondary signals, alongside TCR engagement, that are essential for full activation, proliferation, and differentiation of T cells. Key components include receptors on T cells (CD28, ICOS, 4-1BB, OX40) and their ligands on antigen-presenting cells (B7-1/CD80, B7-2/CD86). This pathway regulates the balance between effective immunity and tolerance, influencing effector function development, memory generation, regulatory/suppressive functions, and maintenance of self-tolerance. Manipulation of these pathways has therapeutic potential in autoimmunity, transplantation rejection prevention, cancer immunotherapy, and infectious diseases.

Other names

T cell costimulationCostimulatory pathwayT cell activation pathway (Signal 2)

Modulation of T cell activation signals through receptor-ligand interactions, influencing downstream signaling pathways like PI3K/Akt, NFκB, and MAPK/ERK to promote or inhibit T cell responses.