Abstract
Protein posttranslational modifications (PTMs) regulate intracellular signaling associated with development and progression of many diseases; thus, they are key to understanding pathological mechanisms and set up more tailored therapies. In addition, many posttranslationally modified proteins are released into biological fluids and can be used as new and more specific biomarkers. Based on this evidence, we analyzed the role of some PTMs in cancer and described the correlation between specific PTMs and T-cells activation/inhibition in cancer microenvironment. In the second part of this chapter, we analyzed the most commonly used approaches for qualitative and quantitative determination of PTMs. The comparison of three distinct but often complementary methodologies such as immunoblotting, mass spectrometry, and ELISA assays has allowed to highlight the pros and cons of each approach with a focus on their current application and their future developments to obtain more confident biomarkers and therapeutic targets useful for diagnosis, prognosis, and monitoring of the response to therapy.
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