Tyrosinase-related protein 2-specific T-cell receptor (Trp2-TCR) (Trp2-TCR)

The Tyrosinase-related protein 2-specific T-cell receptor (Trp2-TCR) is a specialized immune receptor found on CD8+ T cells that recognizes the Trp2 (Dopachrome tautomerase) peptide fragment presented by the MHC Class I molecule H-2Kb (Bloom et al., 1997). Trp2 is a key enzyme in melanin synthesis and serves as a prominent tumor-associated antigen in melanoma research, particularly in the B16 mouse model (Overwijk et al., 1999). This TCR is a critical tool in the development of adoptive cell therapies, where T cells are engineered to express the Trp2-TCR to target and destroy melanoma cells (Singh et al., 2009). Upon binding to the Trp2/H-2Kb complex, the receptor initiates a signaling cascade that leads to T-cell activation, the release of cytotoxic granules, and the production of pro-inflammatory cytokines like interferon-gamma (Schreurs et al., 2000). While effective in inducing anti-tumor immunity, the use of this TCR is associated with on-target off-tumor toxicities, such as vitiligo, due to the shared expression of Trp2 in healthy melanocytes (Bowne et al., 1999). It remains a foundational model for studying T-cell tolerance and the efficacy of cancer vaccines and TCR-engineered T-cell therapies (Byrne et al., 2011).

Other names

Dopachrome tautomerase-specific T-cell receptorDCT-specific TCRTrp2/H-2Kb-restricted T-cell receptorTrp2-specific CD8+ T-cell receptorSVYDFFVWL-specific TCR

The TCR specifically recognizes and binds the Trp2-derived peptide SVYDFFVWL presented by the H-2Kb MHC Class I molecule. This binding event triggers the CD3 signaling cascade, resulting in the activation of the CD8+ T cell, secretion of interferon-gamma, and the directed lysis of Trp2-expressing cells via the perforin/granzyme pathway.