The Evolving Role of CD8CD28 Immunosenescent T Cells in Cancer Immunology

Overview

Journal Int J Mol Sci

Publisher MDPI

Specialties Biochemistry
Chemistry
Molecular Biology

Date 2019 Jun 12

PMID 31181772

Citations 91

Authors

Wei X Huff

Jae Hyun Kwon

Mario Henriquez

Kaleigh Fetcko

Mahua Dey

Affiliations

Soon will be listed here.

Abstract

Functional, tumor-specific CD8 cytotoxic T lymphocytes drive the adaptive immune response to cancer. Thus, induction of their activity is the ultimate aim of all immunotherapies. Success of anti-tumor immunotherapy is precluded by marked immunosuppression in the tumor microenvironment (TME) leading to CD8 effector T cell dysfunction. Among the many facets of CD8 T cell dysfunction that have been recognized-tolerance, anergy, exhaustion, and senescence-CD8 T cell senescence is incompletely understood. Naïve CD8 T cells require three essential signals for activation, differentiation, and survival through T-cell receptor, costimulatory receptors, and cytokine receptors. Downregulation of costimulatory molecule CD28 is a hallmark of senescent T cells and increased CD8CD28 senescent populations with heterogeneous roles have been observed in multiple solid and hematogenous tumors. T cell senescence can be induced by several factors including aging, telomere damage, tumor-associated stress, and regulatory T (Treg) cells. Tumor-induced T cell senescence is yet another mechanism that enables tumor cell resistance to immunotherapy. In this paper, we provide a comprehensive overview of CD8CD28 senescent T cell population, their origin, their function in immunology and pathologic conditions, including TME and their implication for immunotherapy. Further characterization and investigation into this subset of CD8 T cells could improve the efficacy of future anti-tumor immunotherapy.

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