Antigen-Presenting Cell Function (APC Function)

Antigen-presenting cell (APC) function refers to the process by which certain immune cells detect, process, and display antigens on their surface in a form recognizable to T cells. This is a critical step in initiating and regulating adaptive immune responses. The main professional APCs are dendritic cells, macrophages, and B lymphocytes. APCs capture pathogens or foreign molecules, degrade them into peptide fragments, load them onto MHC molecules, and display the antigen-MHC complexes on the cell surface for recognition by T cell receptors. APCs also provide co-stimulatory signals and secrete cytokines to fully activate T cells. Defects in antigen presentation can result in immunodeficiency, autoimmunity, chronic infection susceptibility, or failure of tumor surveillance. Manipulation of this function is central in vaccine development and immunotherapy strategies.

Other names

Antigen PresentationAPC ActivityMHC Presentation

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