The cure for Type 1 diabetes mellitus (T1DM) is likely to require an effective strategy for suppressing or evading the immune system. When considering curative treatments, it is almost inevitable to consider novel ways of inducing tolerogenicity to insulin-producing β cells. While the main mechanism of achieving tolerogenicity is restoring regulatory T cell (CD4+CD25+Fox3+) to effector T-cell (CD4+Fox3-) homeostasis, the means of achieving this are multifarious. The advent of a glucocorticoid-free immunosuppressive regimen was an early indication of how immunotherapeutics affect β-cell function. As newer biologics are developed, suppressing the immune system continues to become more specific and dynamic. An ever-evolving field of immunology has shifted the paradigm of how T1DM is understood, and the repurposing of T-cell-based biotechnology has the potential to change the way that it is treated. Regulatory T cells can be bioengineered to express T-cell receptors with affinity for peptide–human leukocyte antigen complexes that are frequently encountered in T1DM. Exosomes with embedded T-cell receptors can be isolated from regulatory T cells for use as an off-the-shelf therapy.
Induced regulatory T cells suppress Tc1 cells through TGF-β signaling to ameliorate STZ-induced type 1 diabetes mellitus
