Abstract
Tumor progression has been demonstrated to be supported by chronic inflammatory conditions developed in the tumor microenvironment and characterized by the long-term secretion of various inflammatory soluble factors (including cytokines, chemokines, growth factors, reactive oxygen and nitrogen species, prostaglandins etc.) and strong leukocyte infiltration. Among leukocytes infiltrating tumors, myeloid-derived suppressor cells (MDSCs) represent one of the most important players mediating immunosuppression. These cells may not only strongly inhibit an anti-tumor immune reactions mediated by T cells but also directly stimulate tumorigenesis, tumor growth and metastasis by enhancing neoangiogenesis and creating a suitable environment for the metastatic formation. This review provides an overview of interactions between MDSCs and tumor cells leading to MDSC generation, activation and migration to the tumor site, where they can strongly enhance tumor progression. Better understanding of the MDSC-tumor interplay is critical for the development of new strategies of tumor immunotherapy.
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Abbreviations
- MDSCs:
-
myeloid-derived suppressor cells
- VEGF:
-
vascular endothelial growth factor
- TGF:
-
transforming growth factor
- IL:
-
interleukin
- Tregs:
-
regulatory T cells
- TAMs:
-
tumor-associated macrophages
- DCs:
-
dendritic cells
- STAT:
-
signal transducer and activator of transcription
- iNOS:
-
inducible nitric oxide synthase
- ARG:
-
arginase
- NO:
-
nitric oxide
- ROS:
-
reactive oxygen species
- TCR:
-
T cell receptor
- TNF:
-
tumor necrosis factor
- IFN:
-
interferon
- GM-CSF:
-
granulocyte-macrophage colony-stimulating factor
- G-CSF:
-
granulocyte colony-stimulating factor
- M-CSF:
-
macrophage colony-stimulating factor
- CCL:
-
chemokine C-C motif ligand
- COX:
-
cyclooxygenase
- PGE2:
-
prostaglandin E2
- SCF:
-
stem cell factor
- ATRA:
-
all-trans-retinoic acid
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Acknowledgments
This work was supported by the DKFZ-MOST Cooperation in Cancer Research (grant CA128, to VU), Dr. Mildred Scheel Foundation for Cancer Research (grant 108992, to VU), the Initiative and Networking Fund of the Helmholtz Association within the Helmholtz Alliance on Immunotherapy of Cancer (to VU).
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The authors declare that they have no conflict of interest.
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Umansky, V., Sevko, A. Tumor Microenvironment and Myeloid-Derived Suppressor Cells. Cancer Microenvironment 6, 169–177 (2013). https://doi.org/10.1007/s12307-012-0126-7
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DOI: https://doi.org/10.1007/s12307-012-0126-7