Proinsulin-specific autoreactive T cell (PI-specific T cell)

Proinsulin-specific autoreactive T cells are a specialized subset of lymphocytes that play a central role in the autoimmune destruction of pancreatic beta cells, leading to Type 1 Diabetes (T1D) (Nakayama, 2011). These cells recognize peptides derived from proinsulin, which is considered a primary autoantigen in the disease's early stages (Mannering et al., 2010). The autoimmune process involves CD4+ T cells that recognize proinsulin fragments presented by HLA class II molecules and CD8+ T cells that recognize fragments on HLA class I molecules. Once activated, these T cells infiltrate the pancreatic islets, releasing inflammatory cytokines and directly killing beta cells, which results in insulin deficiency. Therapeutic interventions targeting these cells, such as the anti-CD3 antibody teplizumab, aim to halt this destructive process through T-cell depletion or the induction of antigen-specific tolerance (Herold et al., 2019; Peakman et al., 2017). Monitoring the frequency and phenotype of these cells serves as a critical biomarker for disease progression and the efficacy of immunomodulatory treatments.

Other names

Proinsulin-reactive T cellInsulin-specific autoreactive T cellProinsulin-specific T lymphocytePI-reactive T cell

Modulation of T cell activation, depletion of specific T cell subsets, or induction of antigen-specific immune tolerance to prevent beta cell destruction.