Suppression of T-Cell Expansion by Melanoma is Exerted on Resting Cells
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Immunotherapeutic cancer protocols often rely on the ability to promote proliferative expansion of tumor-specific T-cell, but the influence of cancer on in vivo T-cell expansion remains largely undefined.
The ability of control and B16F10 melanoma-bearing C57BL/6 mice to expand lymphocytic choriomeningitis virus antigen-specific T-cell populations in response to acute viral infection was compared by using flow cytometric assays of splenocytes.
The ability to expand virus-specific CD8+ and CD4+ T-cells was globally and markedly suppressed in tumor-bearing mice. Expanded cytotoxic T lymphocytes (CTLs) retained in vivo and in vitro functionality, suggesting that melanoma growth did not induce T-cell anergy. The magnitude of suppressed proliferative expansion was proportional to the extent of tumor burden. Melanoma-induced suppression of CTL expansion was correlated with upregulated apoptotic activity and hampered the induction of memory precursor effector cells. Adoptive transfer of resting LCMV antigen-specific T-cells before or after tumor establishment demonstrated that a critical period of in vivo exposure of resting T-cells to growing melanoma was responsible for the induction of suppressed expansion. This suppression was durable; surgical resection of melanoma after in vivo exposure to resting T-cells but before antigenic stimulation did not restore full expansion.
These data suggest that growing melanoma tumors exert a global, antigen-independent influence on resting T-cells that fundamentally reprograms their ability to undergo proliferative expansion in response to subsequent antigenic stimulation. This finding may have direct implications for T-cell-based immunotherapeutic strategies.
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- Suppression of T-Cell Expansion by Melanoma is Exerted on Resting Cells
Annals of Surgical Oncology
Volume 18, Issue 13 , pp 3848-3857
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- 1. Section of Surgical Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- 2. William S. Middleton Memorial VA Hospital, Madison, WI, USA
- 3. Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- 4. Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- 5. Department of Pathobiological Sciences, University of Wisconsin School of Veterinary Medicine, Madison, WI, USA