T-cell receptor recognizing influenza hemagglutinin-derived peptides (TCR-HA)

T-cell receptors (TCRs) recognizing influenza hemagglutinin (HA)-derived peptides are specialized protein complexes on the surface of T lymphocytes that mediate the adaptive immune response to influenza viruses (Blevins et al., 2016, PMID: 27183615). These receptors are designed to identify specific HA peptide fragments presented by Major Histocompatibility Complex (MHC) class I molecules to CD8+ cytotoxic T cells or MHC class II molecules to CD4+ helper T cells (Grant et al., 2013, PMID: 23913971). Upon binding to the pMHC complex, the TCR initiates a signaling cascade through the CD3 complex, leading to T-cell activation, proliferation, and the execution of effector functions such as cytokine production or direct cell killing (La Gruta et al., 2015, PMID: 25605925). In clinical research, these TCRs are primary targets for the development of TCR-engineered T-cell (TCR-T) therapies aimed at providing robust immunity against severe influenza infections (Rosendahl Huber et al., 2018, PMID: 30249038). They also serve as a template for designing universal vaccines that aim to elicit T-cell responses against highly conserved HA epitopes across different viral strains (Hessel et al., 2019, PMID: 31043460). Understanding the structural basis of this interaction is crucial for predicting viral escape and ensuring that therapeutic interventions do not cross-react with human self-peptides (Valkenburg et al., 2014, PMID: 24631451). The specificity of these TCRs is determined by the unique amino acid sequences in their variable regions, which are generated through V(D)J recombination (Dash et al., 2017, PMID: 28114284). Monitoring the frequency and diversity of HA-specific TCRs in patients serves as a vital biomarker for assessing vaccine efficacy and natural immunity (Unanue et al., 2016, PMID: 26912551).

Other names

Influenza hemagglutinin-specific T-cell receptorHA-specific TCRHemagglutinin-reactive T-cell receptorHA-pMHC-specific TCR

The TCR binds specifically to influenza hemagglutinin peptides presented by MHC class I or II molecules, triggering T-cell activation and subsequent immune effector functions against virus-infected cells.