Abstract
Exosomes are emerging as important elements that participate in intercellular communication and tumor microenvironment modulation, but the exact mechanisms by which tumor exosomes facilitate the generation of the immunosuppressive microenvironment remain unclear. Here we investigated the effects of glioma-derived exosomes (GDEs) on macrophage polarization and glioma progression. We also performed microRNA sequencing analysis of GDEs to identify the microRNA that mediated macrophage polarization. The microRNA-associated intracellular signaling pathway in macrophages was further investigated. Compared with normoxic glioma-derived exosomes (N-GDEs), hypoxic glioma-derived exosomes (H-GDEs) markedly induced M2 macrophage polarization, which subsequently promoted glioma proliferation, migration and invasion in vitro and in vivo. MicroRNA sequencing analysis identified miR-1246 as the most enriched microRNA in H-GDEs. Moreover, miR-1246 was enriched in the CSF of GBM patients and decreased after tumor resection. Further investigation determined that miR-1246 mediated H-GDE-induced M2 macrophage polarization by targeting TERF2IP to activate the STAT3 signaling pathway and inhibit the NF-κB signaling pathway. Our study elucidated a mechanism by which hypoxia and glioma influence M2 macrophage polarization via exosomes, which could facilitate the formation of the immunosuppressive microenvironment. Moreover, our results suggested that miR-1246 in the CSF of GBM patients may be a novel biomarker for GBM diagnosis and that treatment targeting microRNA-1246 may contribute to antitumor immunotherapy.
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Acknowledgements
We thank the surgeons, physicians, and patients who participated in these studies.
Funding
This work was supported by grants from the National Natural Science Foundation of China (grant No.30872645, 81372719, 81172403, 81571284, 91542115, 81874083, 81702468), Natural Science Foundation of Shandong Province of China (grant No.2017CXGC1203, 2013GGE27006, 2017G006012) and the Taishan Scholars of Shandong Province of China (grant No.ts201511093).
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41388_2019_996_MOESM1_ESM.doc
Clinical-pathologic characteristics of 26 glioma patients and association between exosomal miR-1246 difference in CSF and these characteristics
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Qian, M., Wang, S., Guo, X. et al. Hypoxic glioma-derived exosomes deliver microRNA-1246 to induce M2 macrophage polarization by targeting TERF2IP via the STAT3 and NF-κB pathways. Oncogene 39, 428–442 (2020). https://doi.org/10.1038/s41388-019-0996-y
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DOI: https://doi.org/10.1038/s41388-019-0996-y
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