Screening self-peptides for recognition by mouse alloreactive CD8⁺ T cells using direct ex vivo multimer staining

Area of Science:

• Immunology
• Molecular Biology
• Transplantation Science

Background:

• Major histocompatibility complex (MHC) molecules present peptides to T cells, playing a critical role in immune responses.
• Alloreactivity, the immune response against foreign MHC molecules, is a major barrier in organ transplantation.
• Identifying specific immunogenic epitopes is crucial for understanding and potentially manipulating these responses.

Purpose of the Study:

• To develop a robust protocol for identifying immunogenic self-peptide/allogeneic MHC epitopes.
• To enable the characterization of T-cell responses against specific allogeneic MHC-presented peptides.
• To provide a foundation for future studies in transplantation immunology and autoimmune disease.

Main Methods:

• Generation of alloreactive CD8+ T cells through skin grafting and AAV vector boosting.
• Peptide-exchange approach for assembling peptide-MHC (pMHC) multimers.
• Measurement of T-cell recognition using generated pMHC multimers.

Main Results:

• A protocol was established for generating enriched alloreactive CD8+ T cells.
• A method for assembling diverse pMHC multimers was successfully implemented.
• The protocol allows for the measurement of epitope recognition by alloreactive T cells.

Conclusions:

• The presented protocol offers a novel strategy for identifying immunogenic self-peptide/allogeneic MHC epitopes.
• This method facilitates the detailed characterization of T-cell responses in an allogeneic context.
• The findings contribute to a deeper understanding of immune recognition in transplantation and autoimmunity.