T-cell surface glycoprotein CD3 epsilon chain (CD3E)

The **T-cell surface glycoprotein CD3 epsilon chain (CD3E)** is one of four distinct polypeptide chains (epsilon, gamma, delta, and zeta) forming the **CD3 complex**, which is essential for the surface expression and signaling function of the T cell receptor (TCR) in T lymphocytes[1][2][5][6]. CD3E contains an immunoreceptor tyrosine-based activation motif (ITAM) in its cytoplasmic tail, which relays signal transduction from the antigen-engaged TCR to intracellular signaling pathways, thus playing a pivotal role in T cell activation, development, and immune responses[1][6]. Loss or mutation of the CD3E gene causes severe immunodeficiency, and CD3E is a well-established therapeutic and diagnostic target, notably for monoclonal antibody therapies that modulate T cell activity in contexts such as transplantation, autoimmune disease, and hematological cancers[5][6].

Other names

CD3 epsilonCD3ET lymphocyte surface antigen CD3 epsilon chainT cell surface glycoprotein CD3 epsilon chainCD3-epsilon chainCluster of differentiation 3 epsilon

Monoclonal antibodies binding to CD3 epsilon induce T cell receptor modulation and T cell apoptosis or anergy - Block or modulate T-cell activation - Deplete T cells or modulate T cell function via Fc-mediated cytotoxic effects