The Role of Inflammatory Cytokines in Creating T Cell Exhaustion in Cancer.

Secreted inflammatory cytokines are considered as critical mediators in the tumor microenvironment. Cancer cells play a significant role in the differentiation of effector T cells to exhausted T cells through mediator production. Effector T cells that undergo tumor microenvironment become terminally differentiated into exhausted T cells. These changes create an opportunity for tumorigenesis and invasion of cancer cells. Despite having some characteristics of effector T cells, the exhausted T cells lose their antitumor properties. In this article, the phenotypes and function of exhausted T cells were reviewed and the expression pattern of inflammatory cytokines in tumor tissues and peripheral blood of cancer patients were described. Additionally, the effects of inflammatory cytokines on intracellular factors and signals of T lymphocyte cells were explained. In conclusion, the authors referred to probable approaches that could be used to improve the antitumor activity of T cells and intervention into T cell exhaustion.