Proinsulin-reactive T cell

Proinsulin-reactive T cells are T lymphocytes (both CD4+ and CD8+ subsets) that specifically recognize peptides derived from proinsulin, the precursor protein to insulin, presented by MHC molecules on pancreatic β-cells. They play a pivotal role in the autoimmune destruction of β-cells in type 1 diabetes. High frequencies of these cells are found in pancreatic islets and peripheral blood of individuals with type 1 diabetes, particularly those carrying susceptible HLA alleles (e.g., HLA-DQ8, DQ2, HLA-A*02:01). These T cells recognize distinct epitopes across the proinsulin/insulin molecule, including regions associated with the B-chain and C-peptide. Their frequency and reactivity correlate with loss of β-cell function, making them therapeutic targets and potential biomarkers for disease progression and for monitoring interventions focused on immune tolerance or β-cell preservation[1][2][3][5][6].

Other names

Proinsulin-specific T cellPreproinsulin-reactive T cellProinsulin-autoreactive T cell

For emerging drug approaches: Immune tolerization (inducing T cell anergy or regulatory T cell responses), Antigen-specific immune suppression (blocking or deleting autoreactive T cells)[2][3]