T-cells contribute to pathophysiological processes in myocardial diseases, including myocardial infarction (MI) and heart failure (HF). Antigen-specificity is a hallmark of T-cell responses but the cardiac antigens that trigger heart-directed T-cell responses in patients have not yet been uncovered, thus posing a roadblock to translation. In the present exploratory study, we identified a peptide fragment of the beta-1 adrenergic receptor (ADRB1) that elicits CD4+ T-cell responses after myocardial infarction in patients with a defined HLA haplotype. Our observations may advance the development of tools to monitor other antigen-specific immune responses in patients.
Keywords: Adrenergic receptor beta-1; Cardiac antigens; HLA-DRB1*13; Myocardial infarction; T-cells.
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