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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Abbreviations
- APD:
-
Advanced plasma-cell disease
- EPD:
-
Early plasma-cell disease
- HD:
-
Healthy donor
- LFA-1:
-
Lymphocyte function-associated antigen 1
- MGUS:
-
Monoclonal gammopathy of undetermined significance
- MM:
-
Multiple myeloma
- MNC:
-
Mononuclear cells
- PB:
-
Peripheral blood
- PCD:
-
Plasma cell dyscrasia
- SLE:
-
Systemic lupus erythematosus
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Study conception and design: Julian Plaumann, Melanie Engelhardt, Michael Hundemer. Acquisition of data: Julian Plaumann, Melanie Engelhardt, Brigitte Neuber, Eva Amman. Analysis and interpretation of data: Julian Plaumann, Melanie Engelhardt, Eva Amman, Hakim Echchannaoui, Mohamed H. S. Awwad, Michael Hundemer. Drafting of manuscript: Julian Plaumann, Michael Hundemer. Critical revision: Mohamed H. S. Awwad, Marc S. Raab, Jens Hillengass, Niels Halama, Carsten Müller-Tidow, Hartmut Goldschmidt.
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All human studies were performed after obtaining written informed consent in accordance with the Declaration of Helsinki and were approved by the ethics committee of the Medical Faculty, University of Heidelberg according to the institutional guidelines. Data safety management was performed according to the data safety regulations of the University Hospital Heidelberg.
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Plaumann, J., Engelhardt, M., Awwad, M.H.S. et al. 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 67, 1695–1707 (2018). https://doi.org/10.1007/s00262-018-2230-0
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DOI: https://doi.org/10.1007/s00262-018-2230-0