Abstract
Tumor-derived extracellular vesicles (TEVs) secreted into the blood create a pre-metastatic niche in distant organs; however, it is unclear how TEVs are delivered and how they affect stromal cells in the tumor microenvironment. Tumor-associated macrophages (TAMs) have pivotal roles in cancer progression by interacting with cancer cells and other stromal cells. Here, we report a novel function of TAMs: delivery and transmission of TEV contents. TEV-incorporating macrophages (TEV-MΦs) showed increased invasiveness and were disseminated widely. Upon contact with host stromal cells (peritoneal mesothelial cells (PMCs), fibroblasts, and endothelial cells), TEV-MΦs released membrane blebs containing TEVs, a process dependent upon localized activation of caspase-3 in MΦs. Scattered blebs were incorporated into stromal cells, leading to transfer of cancer-derived RNA and proteins such as TGF-β, activated Src, Wnt3, and HIF1α. TEV-MΦ-secreted blebs containing cancer-derived components contributed to myofibroblastic changes in recipient stromal cells. TEVs delivered by MΦs penetrated deep into the parenchyma of the stomach in TEV-injected mice, and transmitted TEVs to PMCs lining the stomach surface; this process induced PMCs to undergo mesothelial–mesenchymal transition. PMCs infiltrated the gastric wall and created a niche, thereby promoting tumor invasion. Depletion of MΦs prevented these events. Moreover, TEV-MΦs created a pro-metastatic niche. Taken together, these results suggest a novel function for TAMs: transfer of cancer-derived components to surrounding stromal cells and induction of a pro-tumor microenvironment via an increase in the number of CAF-like cells.
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Acknowledgements
We thank members of the Bioscience Education and Research Support Center (BERSC) in Akita University for technical assistance.
Funding
This work was supported by JSPS KAKENHI Grants (Nos. 17K19579 and 16H04691 to M. Tanaka), a Research Grant from the Princess Takamatsu Cancer Research Fund (14-24620 to M. Tanaka), the Takeda Science Foundation, and Project Mirai Cancer Research grants to M. Tanaka.
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Umakoshi, M., Takahashi, S., Itoh, G. et al. Macrophage-mediated transfer of cancer-derived components to stromal cells contributes to establishment of a pro-tumor microenvironment. Oncogene 38, 2162–2176 (2019). https://doi.org/10.1038/s41388-018-0564-x
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DOI: https://doi.org/10.1038/s41388-018-0564-x
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