T-cell receptor recognizing idiotype-derived peptide-MHC II complexes (Id-specific TCR)

The Helper T cell receptor (TCR) recognizing idiotype-derived peptide–MHC complexes is a specialized alpha-beta heterodimeric receptor expressed on the surface of CD4+ T lymphocytes (Bogen, 1993). Its primary biological function is the immunosurveillance of B-cell malignancies, where it identifies unique, tumor-specific peptides derived from the variable regions (idiotypes) of the malignant B cell's immunoglobulin (Corthay et al., 2005). These peptides are presented on the cell surface by Major Histocompatibility Complex (MHC) class II molecules. Upon binding to these complexes, the TCR initiates a signaling cascade that activates the helper T cell, leading to the secretion of pro-inflammatory cytokines such as interferon-gamma and the recruitment of other immune effectors, including cytotoxic CD8+ T cells and macrophages (Lynch et al., 2003). In clinical oncology, this receptor is a critical component of personalized immunotherapy; idiotype vaccines (such as Dasiprotimut-T) aim to stimulate and expand these specific T cell populations in patients with follicular lymphoma or multiple myeloma (Kwak et al., 1992; Bendandi et al., 1999). Additionally, the cloning of these specific TCRs for use in TCR-engineered T-cell therapies represents a potent strategy for direct tumor targeting, although challenges such as MHC downregulation by tumor cells and the need for patient-specific antigen identification remain significant hurdles (Haabeth et al., 2014).

Other names

Idiotype-specific T-cell receptorId-specific TCRHelper T-cell receptorCD4+ TCR recognizing Ig-idiotypeT-cell receptor recognizing idiotype-derived peptide-MHC II complexes

Activation of CD4+ T cells through recognition of tumor-specific idiotype peptides presented on MHC class II molecules.