Abstract
CD4+FoxP3+ regulatory T cells (Tregs) represent a major cellular mediator of cancer immune evasion. The expression of tumor necrosis factor receptor type II (TNFR2) on Tregs is reported to identify the maximally suppressive Treg population in both mice and human. We therefore investigated the phenotype and function of TNFR2+ Tregs present in the peripheral blood (PB) of 43 lung cancer patients. Further, the association of TNFR2 expression on Tregs with clinicopathological factors was analyzed. The results showed that in the PB of lung cancer patients, Tregs expressed markedly higher levels of TNFR2 than conventional T cells (Tconvs). Expression of TNFR2 appeared to correlate better than CD25+ and CD127− with FoxP3 expression. PB TNFR2+ Tregs in lung cancer patients were more proliferative and expressed higher levels of the immunosuppressive molecule CTLA-4, and consequently more potently suppressed IFNγ production by cocultured CD8 CTLs. More importantly, higher TNFR2 expression levels on Tregs were associated with lymphatic invasion, distant metastasis and more advanced clinical stage of lung cancer patients. Therefore, our study suggests that TNFR2+ Tregs play a role in promoting tumor progressive metastasis and expression of TNFR2 by PB Tregs may prove to be a useful prognostic marker in lung cancer patients.
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Abbreviations
- AML:
-
Acute myeloid leukemia
- CTLs:
-
Cytotoxic T lymphocytes
- CTLA-4:
-
Cytotoxic T lymphocyte-associated antigen 4
- ELISA:
-
Enzyme-linked immunosorbent assay
- FoxP3:
-
Forkhead box P3
- IFN:
-
Interferon
- IgG:
-
Immunoglobulin G
- MFI:
-
Mean fluorescence intensity
- PB:
-
Peripheral blood
- PBMCs:
-
Peripheral blood mononuclear cells
- Tconvs:
-
Conventional T cells
- TGF:
-
Transforming growth factor
- TNF:
-
Tumor necrosis factor
- TNFR1:
-
Tumor necrosis factor receptor type I
- TNFR2:
-
Tumor necrosis factor receptor type II
- Tregs:
-
CD4+FoxP3+ regulatory T cells
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Acknowledgments
This study was supported by grants from Natural Science Foundation of China (No. 81171983 and No. 81401888) and Tianjin Natural Science Foundation (No. 12JCYBJC16100). We honestly thank Dr. Joost J. Oppenheim for his critical review and comments that greatly improved the manuscript.
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Fan Yan and Ruijuan Du have contributed equally to this work.
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Yan, F., Du, R., Wei, F. et al. Expression of TNFR2 by regulatory T cells in peripheral blood is correlated with clinical pathology of lung cancer patients. Cancer Immunol Immunother 64, 1475–1485 (2015). https://doi.org/10.1007/s00262-015-1751-z
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DOI: https://doi.org/10.1007/s00262-015-1751-z