Major Histocompatibility Complex Class II (MHC-II) Antigen Presentation Pathway (MHC-II Pathway)

The MHC class II pathway is a critical process in adaptive immunity where antigen-presenting cells (APCs) display processed peptide antigens on their surface using Major Histocompatibility Complex class II (MHC-II) molecules. This presentation is essential for the activation of CD4+ T helper cells, which orchestrate downstream immune responses including B cell activation and antibody production. The pathway involves antigen uptake, processing into peptides within endosomes, loading onto MHC-II molecules (regulated by HLA-DM), and subsequent presentation to T cells. Defects in the pathway can lead to immunodeficiency or autoimmunity.

Other names

MHC Class II PathwayMHC-II Antigen PresentationMHCII antigen processing and presentation

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