T-dependent antigen

T-dependent antigens are substances that trigger an immune response with the help of T cells. B cells, a type of lymphocyte, recognize these antigens. However, for a full activation and antibody production, B cells typically require additional stimulation from activated helper T cells.1

Helper T cells are crucial immune cells that coordinate the body's defense. They activate other immune cells, including B cells, cytotoxic T cells, and macrophages. Helper T cells recognize antigens presented on the surface of antigen-presenting cells, like macrophages, in conjunction with major histocompatibility complex (MHC) molecules. This interaction, along with cytokine signaling or costimulatory signals, activates the helper T cell. Once activated, helper T cells can then help activate B cells that have encountered the same antigen. This collaborative process is essential for mounting an effective immune response against many types of pathogens.21