Influenza A H3N2 hemagglutinin-specific T cell receptor (H3N2 HA-specific TCR)

The Influenza A H3N2 hemagglutinin-specific T cell receptor (TCR) is a specialized heterodimeric protein complex found on the surface of T lymphocytes that mediates the adaptive immune response to the H3N2 influenza virus. It specifically recognizes processed peptides derived from the viral hemagglutinin (HA) protein, such as the highly conserved and immunodominant HA 306-318 epitope, when presented by Major Histocompatibility Complex (MHC) molecules (Hennecke & Wiley, 2002). Upon binding to these peptide-MHC complexes, the TCR triggers a signaling cascade through the CD3 complex, leading to T cell proliferation and the execution of effector functions like cytokine secretion and direct lysis of infected cells (Sridhar et al., 2013). These receptors are critical targets for vaccine design, as inducing a robust population of HA-specific T cells can provide cross-protective immunity against drifting viral strains. In modern immunotherapy, these TCR sequences are being utilized to develop TCR-engineered T cell (TCR-T) therapies aimed at providing rapid, specific protection for immunocompromised patients or those at high risk of severe influenza complications. The effectiveness of targeting these receptors is often influenced by the high rate of antigenic drift in the H3N2 virus and the specific HLA alleles of the host.

Other names

H3N2 HA-reactive TCRInfluenza A virus H3N2 hemagglutinin-specific T-cell receptorHA-specific TCRTCR recognizing HA 306-318H3N2 HA-specific T-cell receptor

Antigen-specific T cell activation via TCR-CD3 complex signaling upon binding to peptide-MHC complexes, leading to viral clearance and immune memory.