T cell activation (co-stimulation-mediated) (N/A)

T cell activation via co-stimulation is a crucial process for initiating adaptive immune responses. It involves the interaction of co-stimulatory molecules on antigen-presenting cells (APCs) with their receptors on T cells, providing a second signal alongside TCR engagement. This ensures full T cell activation, proliferation, differentiation, and survival, while its absence leads to anergy, apoptosis, or tolerance. Key co-stimulatory molecules include CD28, OX40, and 4-1BB, while inhibitory receptors like CTLA4 and PD-1 regulate the process. Targeting these pathways is a major focus in immunotherapy for cancer, autoimmunity, and transplantation.

Other names

T cell co-stimulationT cell costimulationCo-stimulatory signaling in T cellsT cell activation via co-stimulation

Modulation of T cell activation through agonism or antagonism of co-stimulatory or co-inhibitory receptors, altering downstream signaling pathways affecting T cell function.