Targeting the pMHC-TCR Interaction: Molecular Strategies and Therapeutic Potential in Autoimmunity

Area of Science:

• Immunology
• Molecular Biology
• Autoimmunity

Background:

• Autoimmune diseases result from a loss of self-tolerance, where T-cell receptor (TCR) recognition of self-antigen peptide-MHC (pMHC) complexes initiates pathogenesis.
• Current broad immunosuppressants impair global immunity, highlighting the need for targeted therapies.

Purpose of the Study:

• To review the pMHC-TCR interaction as a key target for antigen-specific immunotherapy in autoimmune diseases.
• To explore novel molecular strategies for restoring self-tolerance without systemic immunosuppression.

Main Methods:

• Analysis of the structural basis of pMHC-TCR interactions.
• Review of molecular drivers of tolerance breakdown (genetic susceptibility, molecular mimicry, PTMs, ectopic MHC II expression).
• Examination of emerging interventions like pMHC nanoparticles, soluble pMHC, and CAR-Treg cell therapy.

Main Results:

• The pMHC-TCR interaction is a critical checkpoint for antigen-specific intervention.
• Understanding tolerance breakdown mechanisms is crucial for developing targeted therapies.
• Novel strategies like pMHC-based therapies and CAR-Treg cells show promise in modulating pathogenic T-cell responses.

Conclusions:

• Precision interventions targeting the immunological synapse offer a pathway to antigen-specific immunotherapy for autoimmune diseases.
• These approaches aim to restore self-tolerance safely, without compromising global immunity.