Cancer Immunology, Immunotherapy

, Volume 56, Issue 9, pp 1429–1442

Expansion and characteristics of human T regulatory type 1 cells in co-cultures simulating tumor microenvironment

  • Christoph Bergmann
  • Laura Strauss
  • Reinhard Zeidler
  • Stephan Lang
  • Theresa L. Whiteside
Original Article

Abstract

Objective

Chronic inflammation and cancer development are associated with dysregulated immune responses and the presence of regulatory T cells (Treg). To study the role of Treg in tumor cell escape from immune surveillance, an in vitro model simulating the tumor microenvironment and promoting the induction and expansion of IL-10+ Treg type 1 (Tr1) was established.

Methods

An in vitro co-culture system (IVA) included an irradiated head and neck squamous cell carcinoma cell line, immature dendritic cells (iDC), CD4+CD25T cells and cytokines, IL-2 (10 IU/ml), IL-10 (20 IU/ml), IL-15 (20 IU/ml) ± 1 nM rapamycin. Autologous iDC and CD4+CD25 T cells were obtained from the peripheral blood of 15 normal donors. Co-cultures were expanded for 10 days. Proliferating lymphocytes were phenotyped by multi-color flow cytometry. Their suppressor function was measured in CFSE inhibition assays ± neutralizing anti-IL-10 mAb and using transwell cultures. Culture supernatants were tested for IL-4, IL-10, TGF-β and IFN-γ in ELISA.

Results

In the IVA, low doses of IL-2, IL-10 and IL-15 promoted induction and expansion of CD3+CD4+CD25IL2Rβ+IL2Rγ+FoxP3+CTLA-4+IL-10+ cells with suppressor activity (mean suppression ± SD = 58 ± 12%). These suppressor cells produced IL-10 (mean ± SD = 535 ± 12 pg/ml) and TGF-β (mean ± SD = 512 ± 38 pg/ml), but no IL-4 or IFN-γ. Suppressor function of co-cultures correlated with the percent of expanding IL-10+ Tr1 cells (r= 0.9; P < 0.001). The addition of rapamycin enriched Tr1 cells in all co-cultures. Neutralizing anti-IL-10 mAb abolished suppressive activity. Suppression was cell-contact independent.

Conclusion

The tumor microenvironment promotes generation of Tr1 cells which have the phenotype distinct from that of CD4+CD25highFoxP3+ nTreg and mediate IL-10 dependent immune suppression in a cell-contact independent manner. Tr1 cells may play a critical role in cancer progression.

Keywords

Tr1 cells Treg HNSCC Immune suppression Tumor escape Rapamycin 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Christoph Bergmann
    • 1
  • Laura Strauss
    • 1
  • Reinhard Zeidler
    • 2
  • Stephan Lang
    • 3
  • Theresa L. Whiteside
    • 1
  1. 1.Research Pavilion at the Hillman Cancer CenterUniversity of Pittsburgh Cancer InstitutePittsburghUSA
  2. 2.Department of OtorhinolaryngologyLudwig-Maximilians-University of MunichMunichGermany
  3. 3.Department of OtorhinolaryngologyUniversity of Duisburg-EssenEssenGermany

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