Myeloid-derived suppressor cells hamper natural killer cell activity in cancer : role of peptidases
Jakoš, Tanja ...
Natural killer (NK) cells represent critical effectors of anti-tumor immune responses due to their ability to target tumor cells that escape recognition by the adaptive arm of the immune system. NK ...cell efficacy depends on multiple factors, including their propensity to infiltrate tumors, to reach activation threshold, and to differentiate into mature cytotoxic cells. The tumor microenvironment counteracts protective immunity by delivering anti-inflammatory signals, which stimulate the development of myeloid-derived suppressor cells (MDSC). MDSCs utilize numerous proximity-dependent and independent mechanisms to suppress functions of cytotoxic T lymphocytes and NK cells. Importantly, substantial part of their suppressive activity depends on peptidases. MDSC-derived peptidases incapacitate NK cells by shedding ligands for their activating receptors and by processing key cytokines involved in regulation of immune responses. Moreover, they are needed for sustaining the immunosuppressive loop through promotion of MDSC accumulation, expansion, and enhancement of their survival. Peptidases are at the forefront of cancer progression. However, their disparate roles in immune cells have only recently become appreciated in orchestration of the cancer immune responses. Studies that focused on elucidating the potential of peptidase inhibitors in regulation of the anti-tumor immune responses have led to renewed interest in clinical development of peptidase inhibitors. In parallel, they inspired the development of novel theranostics, that exploit increased activity of peptidases in infiltrating immune cells for targeted drug release or activation of imaging probes.
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