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T cells are one of the important types of white blood cells of the immune system and play a central role in the adaptive immune response. T cells can be distinguished from other lymphocytes by the presence of a T-cell receptor (TCR) on their cell surface. T cells are born from hematopoietic stem cells, [1] found in the bone marrow.
A lymphocyte is a type of white blood cell (leukocyte) in the immune system of most vertebrates. [1] Lymphocytes include T cells (for cell-mediated and cytotoxic adaptive immunity), B cells (for humoral, antibody-driven adaptive immunity), [2] [3] and innate lymphoid cells (ILCs; "innate T cell-like" cells involved in mucosal immunity and homeostasis), of which natural killer cells are an ...
Subsequently, the primed cells will differentiate either into effector cells or into memory cells that can mount stronger and faster response to second and upcoming immune challenges. [2] T and B cell priming occurs in the secondary lymphoid organs (lymph nodes and spleen). Priming of naïve T cells requires dendritic cell antigen presentation.
Once mature, T cells emigrate from the thymus to provide vital functions in the immune system. [11] [12] Each T cell has a distinct T cell receptor, suited to a specific substance, called an antigen. [12] Most T cell receptors bind to the major histocompatibility complex on cells of the body.
Of the three B cell subsets, FO B cells preferentially undergo T cell-dependent activation while MZ B cells and B1 B cells preferentially undergo T cell-independent activation. [ 16 ] B cell activation is enhanced through the activity of CD21 , a surface receptor in complex with surface proteins CD19 and CD81 (all three are collectively known ...
Immunological synapse between Jurkat T cell expressing GFP-actin (green) and Raji B cell stained with CMAC (blue). Synapse formation was induced by Staphylococcal enterotoxin E superantigen . In immunology , an immunological synapse (or immune synapse ) is the interface between an antigen-presenting cell or target cell and a lymphocyte such as ...
T-cell dependent B-cell activation, showing TH2-cell (left) B-cell (right) and several interaction molecules self-made according to Janeway et al, Immunologie (Berlin, 2002) Following development in the thymus, these cells (termed recent thymic emigrants (RTE)) egress from the thymus and home to secondary lymphoid organs (SLO; spleen and lymph ...
T cells need three signals to become fully activated. Signal 1 is provided by the T-cell receptor when recognising a specific antigen on a MHC molecule. Signal 2 comes from co-stimulatory receptors on T cell such as CD28, triggered via ligands presented on the surface of other immune cells such as CD80 and CD86. These co-stimulatory receptors ...