Journal
ONCOIMMUNOLOGY
Volume 3, Issue 2, Pages -Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/onci.27680
Keywords
T cells; tumor immunotherapy; 4-1BB; eomesodermin; PD-1; Lag3
Categories
Funding
- National Institute of Health [P30CA134274, K08HL93207]
- Gabrielle's Angel Foundation for Cancer Research
- Marlene and Stewart Greenebaum Cancer Center
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CD8(+) T cells in progressing tumors frequently fail to mount an effective antitumor response often in association with the expression of inhibitory receptors, including programmed cell death-1 (PD-1) and lymphocyte-activation gene 3 (Lag3). Using a lymphoma tumor model, we demonstrate that tumor-infiltrating CD8(+) T cells from growing tumors co-express inhibitory receptors and co-stimulatory receptors, including 4-1BB (TNFRSF9) as well as high levels of 2 transcription factors, Eomesodermin (Eomes) and T-bet (Tbx21), critical determinants of CD8(+) T cell fate. Immunotherapy with an agonistic anti-4-1-BB antibody altered the ratio of Eomes to T-bet expression in tumor-infiltrating CD8(+) T cells by increasing Eomes and decreasing T-bet expression. 4-1BB-agonist immunotherapy was also associated with downregulated expression of the inhibitory receptors PD-1 and Lag3 on tumor-infiltrating CD8(+) T cells, a molecular phenotype associated with subsequent attenuation of tumor growth. Furthermore, 4-1BB-agonist immunotherapy failed to effect tumor progression in mice with Eomes deficient T cells. However, upon resumption of tumor growth, tumor-infiltrating CD8(+) T cells from treated animals continued to express high levels of Eomes as well as elevated levels of the inhibitory receptors PD-1 and Lag3. Our data suggest that tumor-infiltrating CD8(+) T cells are poised between activation and inhibition as dictated by expression of both co-stimulatory receptors and inhibitory receptors and demonstrate that T cell expression of Eomes is necessary, but not sufficient, for efficacious 4-1BB-agonist-mediated immunotherapy.
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