Development and implementation of a direct detection, quantitation and validation system for class I MHC self-peptide...

Area of Science:

• Immunology
• Molecular Biology
• Virology

Background:

• Viral infections and cancers induce complex cellular changes.
• Class I MHC molecules present intracellular peptides, reflecting proteomic alterations.
• A direct technology for identifying MHC-presented epitopes is crucial.

Purpose of the Study:

• To develop and validate a technology for discovering and confirming class I MHC-peptide epitopes.
• To model this technology using HIV-1 infected cells.

Main Methods:

• Utilized hollow fiber class I HLA protein production.
• Employed mass spectrometric epitope analysis.
• Developed a T cell receptor mimic (TCRm) monoclonal antibody (mAb) for validation.

Main Results:

• Identified a 3-fold increase in the host peptide VLMTEDIKL(720-728) [eIF4G((720))] presented by HLA-A*0201 in HIV-1 infected cells.
• The 4F7 TCRm mAb specifically recognized the eIF4G((720))-A*0201 complex.
• Observed a significant increase in eIF4G((720))-A*0201 presentation in HIV-1 infected PBMCs compared to normal PBMCs.

Conclusions:

• Successfully developed an integrated system for MHC-peptide epitope discovery and validation.
• Demonstrated the utility of this technology in identifying host-derived epitopes in viral infections.
• The findings highlight the potential of targeting specific MHC-peptide complexes in disease.