Hemagglutinin-specific T-cell receptor (HA-specific TCR) (HA-specific TCR)

The T-cell receptor (TCR) on CD4+ T helper cells that specifically recognizes influenza virus hemagglutinin (HA) peptides presented by Major Histocompatibility Complex (MHC) class II molecules is a critical component of the adaptive immune response to influenza [1]. These TCRs are typically alpha-beta heterodimers that bind to the HA peptide-MHC II complex, triggering a signaling cascade through the CD3 complex that leads to T-cell activation, proliferation, and the secretion of cytokines such as IL-2 and IFN-gamma [2][3]. This interaction is fundamental for providing help to B cells for antibody production and for coordinating the cellular immune response against viral infection [4]. In therapeutic contexts, these specific TCRs are studied for the development of universal influenza vaccines and are used as models in TCR-engineered T-cell therapies to understand antigen-specific activation and potential cross-reactivity [5]. Monitoring the frequency and TCR repertoire of these cells serves as a biomarker for vaccine efficacy and natural immunity [6]. Furthermore, understanding the structural basis of this recognition helps in predicting viral escape mutants and designing more effective immunotherapies [2].

Other names

Influenza HA-specific TCRHA-peptide-MHC II-specific TCRT-cell receptor recognizing influenza hemagglutininHA-TCRHemagglutinin-specific CD4+ T-cell receptor

Recognition of specific influenza hemagglutinin peptide-MHC class II complexes, initiating intracellular signaling via the CD3 complex and ZAP-70 pathway to drive T-helper cell differentiation and effector function.