CD8-positive T cell infiltration and activation (null)

The phrase "CD8+ T cell infiltration/activation" refers to the multi-step immunological process where CD8-positive cytotoxic T lymphocytes migrate from the bloodstream into tissues such as tumors, followed by activation through three main signals: antigen recognition by the T cell receptor (TCR), co-stimulatory signals (primarily via CD28), and cytokine signaling. This activation results in effector functions such as direct killing of infected or malignant cells, secretion of cytokines, and orchestration of broader immune responses. The presence and activity of CD8+ T cells within tumors is a key determinant of effective anti-tumor immunity and is predictive of response to immunotherapy[1][3][4][5]. Mechanisms regulating this process include adhesion and integrin interactions for infiltration, three-signal paradigms for activation, and checkpoints (PD-1, CTLA-4, etc.) that limit overactivation and maintain self-tolerance[1][4].

Other names

CD8+ T cell responseCD8+ T cell recruitment and activationcytotoxic T lymphocyte (CTL) infiltration/activation

Enhancement of T cell activation, inhibition of co-inhibitory receptors (e.g., anti-PD-1/PD-L1, anti-CTLA-4), stimulation with cytokines, adoptive transfer of activated T cells