Abstract
Immune cell activation occurs concurrently with metabolic reprogramming. As important components of the tumor microenvironment, monocytic myeloid-derived suppressor cells (M-MDSCs) are featured by their potent immunosuppressive abilities on anti-tumor effector cells. However, little is known about the contribution of metabolic adaptations to their suppressive roles. In this study, we found that tumor-infiltrating M-MDSCs had the same phenotype with splenic M-MDSCs. Compared with splenic M-MDSCs, tumor-infiltrating M-MDSCs exhibited stronger suppressive activities which was accompanied by higher glycolysis. Inhibition of glycolysis impaired the suppressive function of tumor M-MDSCs. Meanwhile, the results demonstrated that mTOR was responsible for this function regulation. mTOR inhibition by rapamycin decreased the glycolysis and reduced the suppressive activities of these cells. Furthermore, rapamycin treatment inhibited the tumor growth and reduced the percentage of M-MDSCs in 3LL tumor bearing mice. These results demonstrated that modulation of metabolism in immune cells can be an effective way to enhance anti-tumor effects.





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Abbreviations
- 2-DG:
-
2-Deoxy-d-glucose
- 2NBDG:
-
2-(N-(7-Nitrobenz-2-oxa-1,3-diazol-4-yl) amino)-2-deoxyglucose
- Arg1:
-
Arginase I
- ECAR:
-
Extracellular acidification rate
- Eno1:
-
Enolase 1
- FMO:
-
Fluorescence minus one
- HK2:
-
Hexokinase 2
- Glut1:
-
Glucose transporter 1
- Gpi:
-
Glucose-6-phosphate isomerase
- LC/MS:
-
Liquid chromatography–mass spectrometry
- Ldha:
-
Lactate dehydrogenase A
- Mct4:
-
Monocarboxylate transporter 4
- mTOR:
-
Mammalian target of rapamycin
- NOS2:
-
Nitric oxide synthase 2
- OCR:
-
Oxygen consumption rate
- PD-L1:
-
Programmed death ligand 1
- Pkm2:
-
Pyruvate kinase muscle isozyme
- TCA cycle:
-
Tricarboxylic acid cycle
- Tpi:
-
Triosephosphate isomerase
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This work was supported by the National Natural Science Foundation of China under Grants 31570892, 81730045 and 91527305.
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Conception and design: YC, YD and JY; development of methodology: YD, JY and FL; acquisition of data: YC, YD, JY, FL, JQ, HY, DZ and RL; analysis and interpretation of data: YC, YD, JY and FL; writing, review, and/or revision of the manuscript: YC, YD, JY, FL and RL. All authors have read and approved the final manuscript.
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The authors declare that they have no conflict of interest. 3LL Lewis Lung Carcinoma cells were purchased from the Cell Bank of Type Culture Collection of Chinese Academy of Sciences. C57BL/6 mice were purchased from the Shanghai SLAC Laboratory Animal Co., Ltd. (Shanghai, China).
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All experiments were approved by the Institutional Animal Care and Use Committee of Fudan University (20140226067) following the Guidelines for the Care and Use of Laboratory Animals (No. 55 issued by Ministry of Health, China on January 25th, 1998).
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Deng, Y., Yang, J., Luo, F. et al. mTOR-mediated glycolysis contributes to the enhanced suppressive function of murine tumor-infiltrating monocytic myeloid-derived suppressor cells. Cancer Immunol Immunother 67, 1355–1364 (2018). https://doi.org/10.1007/s00262-018-2177-1
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DOI: https://doi.org/10.1007/s00262-018-2177-1