CD3, CD4, CD8 antigens (CD3, CD4, CD8)

CD3, CD4, and CD8 are critical surface antigens present on different subsets of human T lymphocytes. CD3 antigen is a multisubunit protein complex associated with the T cell receptor (TCR), serving as a key signal transduction adaptor. It is used as a pan-T cell marker and is essential for T cell activation. CD4 antigen acts as a co-receptor on helper T cells, binding to MHC class II molecules and facilitating immune coordination and activation; it is a primary target for HIV entry. CD8 antigen serves as a co-receptor on cytotoxic T cells, binding MHC class I molecules and enabling recognition/killing of infected and cancerous cells. All three are leveraged as diagnostic markers and therapeutic targets in immuno-oncology, infectious diseases, and immune modulation, but should be treated as separate, distinct targets for structural annotation and drug development.

Other names

T3 complexCluster of Differentiation 3Helper T cell markerCluster of Differentiation 4Cytotoxic T cell markerCluster of Differentiation 8

Targeting these antigens involves modulation or depletion of T cells, induction of signaling, immunosuppression, inhibition of HIV entry, or enhancement of T cell-mediated cytotoxicity to influence immune responses.