New tregitopes inducing adaptive regulatory T cells in mice

Area of Science:

• Immunology
• Molecular Biology
• Computational Biology

Background:

• Tregitopes are amino acid sequences that induce regulatory T cell (Treg) expansion.
• Tregs are crucial for immune tolerance, with potential applications in autoimmune diseases and transplantation.
• Previous in silico models guided the selection of potential immunotolerogenic peptides.

Purpose of the Study:

• To select potential tregitopes using an in silico model.
• To assess the impact of selected peptides on Treg expansion in vitro.
• To identify novel tregitopes for immunomodulatory applications.

Main Methods:

• Selected eight peptides based on an in silico model and known immunotolerogenic functions.
• Measured peptide affinity to HLA-DRB1*04:01 using surface plasmon resonance.
• Co-cultured mouse antigen-presenting cells with naive T cells, stimulated with peptides, and analyzed Treg frequency via flow cytometry.

Main Results:

• Two novel tregitopes were identified based on their ability to induce Tregs.
• The identified tregitopes were derived from yeast and adenovirus proteins.
• Peptide affinity to HLA-DRB1*04:01 was assessed as a measure of TCR ligand potential.

Conclusions:

• Novel putative tregitopes were identified, demonstrating potential for Treg induction.
• These tregitopes could serve as immunomodulators in preclinical models.
• The findings support the role of tregitopes in maintaining immune tolerance.