Characterizing tumor-promoting T cells in chemically induced cutaneous carcinogenesis
- PMID: 17412837
- PMCID: PMC1871860
- DOI: 10.1073/pnas.0604982104
Characterizing tumor-promoting T cells in chemically induced cutaneous carcinogenesis
Abstract
There is a longstanding but poorly understood epidemiologic link between inflammation and cancer. Consistent with this, we previously showed that alphabeta T cell deficiency can increase resistance to chemical carcinogenesis initiated by 7,12-dimethylbenz[a]anthracene and promoted by phorbol 12-myristate 13-acetate. This provoked the hypothesis that alphabeta T cell deficiency removed T regulatory cells that limit the anti-tumor response or removed a specific tumor-promoting (T-pro) T cell population. Here we provide evidence for the latter, identifying a novel CD8(+) subset that is a candidate for T-pro cells. We demonstrate that CD8 cell-deficient mice show substantially less tumor incidence and progression to carcinoma, whereas susceptibility is restored by CD8(+) cell reconstitution. To characterize the putative T-pro cells, tumor-infiltrating lymphocytes were isolated from normal and CD4(-/-) mice, revealing an activated population of T cell receptor alphabeta(+)CD8(+)CD44(+)CD62L(-) cells expressing the inflammatory mediators IFNgamma, TNFalpha, and cyclooxygenase-2, but deficient in perforin, relative to recirculating cells of equivalent phenotype. This novel population of CD8(+) T cells has intriguing similarities with other lymphocytes that have been associated with tissue growth and invasiveness and has implications for inflammation-associated carcinogenesis, models of cancer immunosurveillance, and immunotherapeutic strategies.
Conflict of interest statement
The authors declare no conflict of interest.
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