T-cell immunoreceptor with Ig and ITIM domains (TIGIT) is a relatively new immunological checkpoint that has been studied as a potential immunotherapeutic target. TIGIT is a transmembrane glycoprotein receptor containing an Ig-like V-type domain in its cytoplasmic domain and an ITIM in its extracellular domain. It's found in activated and memory T cells, as well as NK cells and Tregs. CD155 (PVR: poliovirus receptor) and CD112 (PVRL2, nectin-2) bind to each other on APCs, preventing maturation and conferring a tolerogenic phenotype. Numerous clinical trials on TIGIT-blockade in cancer have been initiated, predominantly combination treatments.
TIGIT Structure
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