Annals of Surgical Oncology

, Volume 14, Issue 10, pp 2854–2860

Immunosuppressive Dendritic and Regulatory T Cells are Upregulated in Melanoma Patients

Authors

    • Department of SurgeryUniversity of Colorado at Denver Health Sciences Center
  • Joel Baumgartner
    • Department of SurgeryUniversity of Colorado at Denver Health Sciences Center
  • Guillermo A. Escobar
    • Department of SurgeryUniversity of Colorado at Denver Health Sciences Center
  • Donald Richter
    • Department of SurgeryUniversity of Colorado at Denver Health Sciences Center
  • Karl Lewis
    • Department of Medicine, Division of Medical OncologyUniversity of Colorado at Denver Health Sciences Center
  • William Robinson
    • Department of Medicine, Division of Medical OncologyUniversity of Colorado at Denver Health Sciences Center
  • Cara Wilson
    • Department of Medicine, Division of ImmunologyUniversity of Colorado at Denver Health Sciences Center
  • Brent E. Palmer
    • Department of Medicine, Division of ImmunologyUniversity of Colorado at Denver Health Sciences Center
  • Rene Gonzalez
    • Department of Medicine, Division of Medical OncologyUniversity of Colorado at Denver Health Sciences Center
Melanomas

DOI: 10.1245/s10434-007-9488-3

Cite this article as:
McCarter, M.D., Baumgartner, J., Escobar, G.A. et al. Ann Surg Oncol (2007) 14: 2854. doi:10.1245/s10434-007-9488-3

Abstract

Background

Immunologic therapies for melanoma rarely succeed, suggesting a persistent counter-regulatory immune modulation. Regulatory T cells (Tregs) and plasmacytoid subpopulations of dendritic cells (pDCs) inhibit the immune response. We hypothesize that melanoma upregulates Tregs and subpopulations of immunosuppressive dendritic cells (DCs).

Methods

Peripheral blood mononuclear cells (PBMCs) were obtained from healthy controls, stage I and stage IV melanoma patients. Tregs were identified as CD4+ and CD25hi. Dendritic cells were identified using a DC cocktail of antibodies including CD11c+ myeloid dendritic cells (mDCs) and CD123+ pDCs. Serum transforming growth factor-β (TGF-β), interleukin-4 (IL-4) and interleukin-10 (IL-10) levels were determined by enzyme-linked immunosorbent assay (ELISA). Statistical analysis was performed using analysis of variance (ANOVA).

Results

Stage IV melanoma patients had a doubling of regulatory T cells compared to both normal subjects and stage I melanoma patients. There was a significantly higher number of DCs in all melanoma patients compared to normal subjects. Stage I melanoma patients had a significantly higher number of pDCs than normal subjects, and all melanoma patients had a higher concentration of mDCs than controls. Serum IL-4 and IL-10 were not detectable but serum TGF-β levels were significantly higher in stage I and stage IV melanoma patients compared to normal controls.

Conclusion

Advanced melanoma is associated with increased numbers of circulating dendritic cells and regulatory T cells. These data suggest that melanoma induces immunosuppressive DCs and regulatory T cells in the systemic circulation.

Keywords

Melanoma Regulatory T cells Dendritic cells Immunosuppression Human

Copyright information

© Society of Surgical Oncology 2007