Anti-Human CD3 [Clone OKT-3] — Purifiedin vivoGOLD™ Functional Grade,Leinco,C2487

CD3 is an invariant antigen of the T cell receptor (TCR) belonging to the Ig superfamily 1 . The CD3/TCR complex is composed of a ⍺β or γδ TCR heterodimer noncovalently associated with invariant CD3 dimers εγ, εδ, and ζζ in a 1:1:1:1 stoichiometry. The TCR mediates recognition of antigenic peptides bound to major histocompatibility complex (MHC) molecules on antigen- presenting cells, while the CD3 portion of the complex transduces activation signals to the T cell nucleus. Together, TCR and CD3 molecules initiate protective immunity against microbes and cancers. OKT-3 was generated by immunizing a BALB/c or CAF1 mouse with human peripheral blood lymphocytes 2 . Spleen cells were fused with P3x63Ag8.U1 myeloma cells for hybridoma production. OKT-3 was initially developed as a pan-T cell antibody to differentiate between cell types 3 and later . became the first monoclonal antibody to be approved for therapy in humans 4 . OKT-3 acts as an immunosuppressive drug in transplant patients 5 , type 1 diabetes, and psoriasis 6 . OKT-3 recognizes, binds, and blocks the CD3 complex of the T cell receptor 4 and thereby blocks the generation and function of cytotoxic T cells 7 . The OKT-3/CD3εγ structure has been resolved 6 .