T-cell immunity

T-cell immunity describes the branch of the immune system carried out by T cells (T lymphocytes), a subtype of white blood cells defined by the presence of a T-cell receptor (TCR) on their surface[1][2][3]. T cells originate from hematopoietic stem cells in the bone marrow and mature in the thymus. There are several T cell subtypes, broadly including cytotoxic (CD8+) T cells, helper (CD4+) T cells, regulatory T cells, and memory T cells[1][2][3][4]. Functions of T-cell immunity include defense against intracellular pathogens (such as viruses and some bacteria), cancer cell surveillance, and the regulation of immune responses (including tolerance and prevention of autoimmunity)[2][3][6]. T cells interact with other immune cells through complex signaling in lymphoid tissues and peripheral sites. Disruption, deficiency, or overactivation of T-cell immunity plays a key role in many diseases, especially infections, immunodeficiencies, autoimmune conditions, and cancer[2][6]. While modulation of T-cell immunity is a major focus of immunotherapy (e.g., checkpoint inhibitors, CAR T cell therapy), the phrase "T-cell immunity" itself is not a targetable molecule or receptor. Summary: "T-cell immunity" is not a specific drug target, receptor, enzyme, or molecular entity, but a fundamental immunological process mediated by diverse subpopulations of T cells[1][2][3][6]. This entry should be flagged for being non-specific with respect to molecular target mapping.

Other names

T lymphocyte-mediated immunitycellular immunitycell-mediated immunity