Major histocompatibility complex-mediated antigen presentation for T cell recognition (MHC antigen presentation)

The recognition of virus-infected cells via major histocompatibility complex (MHC) presentation is a cornerstone of adaptive immunity. MHC molecules are cell-surface glycoproteins responsible for presenting peptide fragments—derived from endogenous (MHC class I) or exogenous (MHC class II) antigens—on the surface of cells. CD8+ cytotoxic T cells recognize virus-derived peptides presented by MHC class I molecules on all nucleated cells, leading to targeted destruction of infected cells. CD4+ helper T cells recognize antigens presented by MHC class II molecules, typically on antigen-presenting cells such as dendritic cells, macrophages, and B cells, orchestrating broader immune responses. This dual recognition ensures that both intracellular pathogens (such as viruses) and extracellular antigens can be surveyed and eliminated by the immune system. The process is central to the immune defense against infections, as well as critical in vaccine response, autoimmunity, and transplant rejection[1][3][4][5][7][8].

Other names

MHC antigen presentationT cell antigen recognitionAntigen presentation by MHC molecules

Immunomodulation (for drugs affecting MHC or T cell responses), Antigen processing interference