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FOXP3+ Tregs: heterogeneous phenotypes and conflicting impacts on survival outcomes in patients with colorectal cancer

Immunologic Research volume 61, pages 338–347 (2015)Cite this article

Abstract

The tumor microenvironment composites a mixture of immune lymphoid cells, myeloid cells, stromal cells with complex cytokines, as well as numerous lymphovascular vessels. Colorectal cancer (CRC) is a common malignancy and one of the leading causes of tumor-related death in the United States and worldwide. The immune status in the tumor microenvironment contributes to the survival of a patient with CRC. Regulatory T cells (Tregs) are considered a key factor in immune escape and immunotherapy failure among cancer patients. The transcription factor forkhead box P3 (FOXP3) is a crucial intracellular marker and also a key developmental and functional factor for CD4+CD25+ Tregs. Tregs are correlated with survival in various human neoplasms, and elevated proportions of Tregs are usually associated with unfavorable clinical outcomes. However, the role of Tregs in CRC remains controversial. High densities of tumor-infiltrating Tregs in CRC patients are reported to be correlated with worse or better outcomes. And Tregs may not be predictive of prognosis after resection of the primary tumor. The exact explanations for these discordant results remain unclear. The heterogeneous instincts of cell phenotype, gene expression, and functional activities of Tregs may partly contribute this contrasting result. Furthermore, the lack of a robust marker for identifying Tregs or due to the different techniques applied is also account. The Treg-specific demethylated region (TSDR) was recently reported to be a specific epigenetic marker for natural Tregs (nTregs), which can stably express FOXP3. The FOXP3-TSDR demethylation assay may be an promising technique for CRC-related nTregs studies.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 81372646 to Cai S. J. and No. 81101586 and 81201836 to Li D. W.), Shanghai International Science and Technology Cooperation Fund (No. 12410707700 to Xu Y.).

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The authors have no conflicts of interest to disclose.

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    1. Department of Colorectal Surgery, Fudan University Shanghai Cancer Center, No. 270 Dong-an Road, Shanghai, 20032, People’s Republic of China

      Changhua Zhuo, Ye Xu, Qingguo Li, Liyong Huang, Dawei Li & Sanjun Cai

    2. Department of Oncology, Shanghai Medical College, Fudan University, No. 270 Dong-an Road, Shanghai, 20032, People’s Republic of China

      Changhua Zhuo, Ye Xu, Qingguo Li, Liyong Huang, Dawei Li & Sanjun Cai

    3. Department of Surgical Oncology, Fujian Provincial Cancer Hospital, Teaching Hospital of Fujian Medical University, No. 420 Fu-ma Road, Fuzhou, 350014, People’s Republic of China

      Changhua Zhuo & Mingang Ying

    4. Key Laboratory of Molecular Virology and Immunology, Unit of Molecular Immunology, Institut Pasteur of Shanghai, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, No. 320 Yue-yang Road, Shanghai, 20031, People’s Republic of China

      Bin Li

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    1. Changhua Zhuo
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    Correspondence to Sanjun Cai or Bin Li.

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    Changhua Zhuo and Ye Xu have contributed equally to this work.

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    Zhuo, C., Xu, Y., Ying, M. et al. FOXP3+ Tregs: heterogeneous phenotypes and conflicting impacts on survival outcomes in patients with colorectal cancer. Immunol Res 61, 338–347 (2015). https://doi.org/10.1007/s12026-014-8616-y

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    Keywords

    • Regulatory T cells (Tregs)
    • Colorectal cancer (CRC)
    • Transcription factor forkhead box P3 (FOXP3)
    • Treg-specific demethylated region (TSDR)
    • Epigenetic phenotype
    • Survival outcome