A Review of Proteomics Strategies to Study T-Cell Activation and Function in Cancer Disease.

Cytotoxic T-cells play a key role in natural response to cancer and in immunotherapy. Understanding in an ever more thorough and complete way the mechanisms underlying their activation and/or those that prevent it is a crucial challenge for the success of the therapy. Proteomics can make a decisive contribution to achieving this goal as it brings together a range of technologies that potentially allow the expression levels of thousands of proteins to be analyzed at the same time. In the first part of this chapter, after an overview of the main mechanisms that determine T-cell dysfunction, new MS-based approaches to characterizing T-cell subpopulations in the tumor microenvironment will be described. The second part of the chapter will focus on the main strategies for cancer immunotherapy, from the selective blockage of inhibitory receptor to CAR T therapy. Examples of proteomics application to tumor microenvironment analysis will be reported to illustrate how these innovative approaches can contribute significantly to understanding the cellular and molecular mechanisms that regulate an effective response to therapy.