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  • A recombinant human monoclonal antibody targeting the co-inhibitory molecule and immune checkpoint inhibitor T-cell immunoreceptor with immunoglobulin (Ig) and immunoreceptor tyrosine-based inhibitory motif (ITIM) domains (TIGIT), with potential immune checkpoint inhibitory activity. Upon administration, anti-TIGIT monoclonal antibody IBI939 targets and binds to TIGIT expressed on various immune cells, particularly on tumor-infiltrating lymphocytes (TILs), thereby preventing the interaction of TIGIT with its ligands CD112 (nectin-2; poliovirus receptor related-2; PRR2; PVRL2) and CD155 (poliovirus receptor; PVR; nectin-like protein 5; NECL-5). This enhances the interaction of CD112 and CD155 with the costimulatory receptor CD226 (DNAX Accessory molecule-1; DNAM-1), which is expressed on immune cells, such as natural killer (NK) cells and CD8+ T-cells. This leads to CD226 dimerization and CD226-mediated signaling and activates the immune system to exert a T-cell-mediated immune response against cancer cells. TIGIT, a member of the Ig super family (IgSF) and an immune inhibitory receptor, plays a key role in the suppression of T-cell proliferation and activation; it is involved in tumor cell immune evasion, and the inhibition of antiviral immune responses.
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