CD4 markers are on which T cells and what MHC class do they recognize?

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CD4 markers are on which T cells and what MHC class do they recognize?

CD4 is a co-receptor found on helper T cells, which are the T cells that coordinate immune responses. These cells recognize peptide antigens presented by MHC class II molecules, a set of proteins primarily displayed by professional antigen-presenting cells like dendritic cells, macrophages, and B cells. The CD4–MHC II–TCR interaction helps fully activate the helper T cell and promote signals that drive antibody production by B cells and activation of macrophages. In contrast, cytotoxic T cells express CD8 and recognize MHC class I on all nucleated cells to kill infected targets, and NK cells are not defined by CD4 in this context. So, CD4 markers identify helper T cells that recognize MHC class II.

CD4 is a co-receptor found on helper T cells, which are the T cells that coordinate immune responses. These cells recognize peptide antigens presented by MHC class II molecules, a set of proteins primarily displayed by professional antigen-presenting cells like dendritic cells, macrophages, and B cells. The CD4–MHC II–TCR interaction helps fully activate the helper T cell and promote signals that drive antibody production by B cells and activation of macrophages. In contrast, cytotoxic T cells express CD8 and recognize MHC class I on all nucleated cells to kill infected targets, and NK cells are not defined by CD4 in this context. So, CD4 markers identify helper T cells that recognize MHC class II.

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