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Plaumann J, Engelhardt M, Awwad MHS, Echchannaoui H, Amman E, Raab MS, Hillengass J, Halama N, Neuber B, Müller-Tidow C, Goldschmidt H, Hundemer M. IL-10 inducible CD8 + regulatory T-cells are enriched in patients with multiple myeloma and impact the generation of antigen-specific T-cells. Cancer Immunol Immunother 2018; 67:1695-1707. [PMID: 30128739 PMCID: PMC11028289 DOI: 10.1007/s00262-018-2230-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 08/09/2018] [Indexed: 01/07/2023]
Abstract
Tumor-mediated immunosuppression via regulatory T-cells is a key player among the various immune-escape mechanisms in multiple myeloma. We analyzed the generation, distribution, function and immunophenotype of CD8+CD28- regulatory T-cells in patients with multiple myeloma. Functionality of CD8+CD28- T-cells was assessed by immunological assays using ex vivo generated antigen-specific T-cells from patients with plasma cell dyscrasias and healthy donors. Detailed analysis of distribution, immunophenotype and cytotoxic potential of CD8+CD28- T-cells was performed by flow cytometry and ELISA. We found that the amount of CD8+CD28- T-cells was directly correlated with the suppression of antigen-specific T-cell responses in patients with plasma cell dyscrasia. Analyzing the CD8+CD28- T-cells in detail, increased numbers of these cells were observed in the bone marrow (i.e., tumor microenvironment) of patients with plasma cell dyscrasia. Furthermore, we identified the expression of lymphocyte function-associated antigen 1 (LFA-1) as a marker of immunosuppression and defined the CD8+CD28-CD57+LFA-1high population as the relevant immunosuppressive compartment. These regulatory T-cells act as immunosuppressors via soluble factors and incubation with IL-10 augmented their immunosuppressive capacity. The immunosuppressive regulatory network of IL-10 and the CD8+CD28-CD57+LFA-1high regulatory T-cells show unique characteristics and contribute to the tumor immune escape mechanism in patients with multiple myeloma.
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Affiliation(s)
- Julian Plaumann
- Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
| | - Melanie Engelhardt
- Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
| | - Mohamed H S Awwad
- Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
| | - Hakim Echchannaoui
- Department of Hematology, Oncology and Pneumology, University Medical Center (UMC) of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Eva Amman
- Department of Hematology, Oncology and Pneumology, University Medical Center (UMC) of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Marc S Raab
- Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
| | - Jens Hillengass
- Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
| | - Niels Halama
- National Center for Tumor Diseases, University of Heidelberg, Heidelberg, Germany
| | - Brigitte Neuber
- Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
| | - Carsten Müller-Tidow
- Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
| | - Hartmut Goldschmidt
- Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
- National Center for Tumor Diseases, University of Heidelberg, Heidelberg, Germany
| | - Michael Hundemer
- Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany.
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