Immunology by numbers: quantitation of antigen presentation completes the quantitative milieu of systems immunology!

Area of Science:

• Immunology
• Analytical Chemistry
• Biochemistry

Background:

• Antigen presentation is crucial for adaptive immunity.
• Current methods for quantifying antigen presentation have limitations, including potential receptor cross-reactivity and variable dose responsiveness.
• There is a need for more precise and definitive methods to study antigen presentation.

Purpose of the Study:

• To review current approaches for quantifying antigen presentation.
• To highlight the role of mass spectrometry (MS) in defining and quantifying MHC-bound peptides.
• To discuss the future potential of MS and big data in immunopeptidomics.

Main Methods:

• Review of existing biological and biochemical readouts for antigen presentation.
• Focus on mass spectrometry (MS) techniques, including high mass accuracy and tandem MS (MS/MS) for peptide identification.
• Discussion of big data approaches for analyzing immunopeptidomes.

Main Results:

• Mass spectrometry provides unambiguous identification of MHC-bound peptides through accurate mass determination and fragmentation patterns.
• MS overcomes limitations of biological readouts, such as cross-reactivity and variable dose responses.
• The study anticipates the future quantification of whole immunopeptidomes using big data MS approaches.

Conclusions:

• Mass spectrometry is a powerful and definitive tool for quantifying antigen presentation at the cell surface.
• MS offers superior specificity and accuracy compared to traditional biological assays.
• Future applications of MS in big data analysis will advance the field of immunopeptidomics for both in vitro and in vivo studies.