Abstract
Purpose
Accumulating evidence has elucidated that the interaction between cancer cells and M2 macrophages plays an important role in the tumorigenesis of hepatocellular carcinoma (HCC). However, the mechanism connecting tumor-derived exosomes, M2 polarization of macrophages, and liver metastasis remain unclear. Therefore, it is necessary to explore their influence on the tumor microenvironment of HCC.
Methods
Transmission electron microscopy, nanometer particle testing, and special biomarker analysis were utilized to characterize exosomes, while the differential expression of microRNAs was evaluated using high-throughput sequencing technology. The functions of miR-200b-3p exosomes were confirmed using in vitro and in vivo assays. The interactions between microRNAs and ZEB1 as well as cancer cells and macrophages were measured using RNA pull-down and luciferase gene reporter assays.
Results
Using in silico analysis, we identified high levels of miR-200b-3p exosome expression in patients with HCC, particularly with relapsed HCC. We demonstrated that HCC cell-derived miR-200b-3p exosomes were internalized by M0 macrophages and induced M2 polarization by downregulating ZEB1 and upregulating interleukin-4. As a result, the JAK/STAT signaling pathway was activated in M2 macrophages, leading to increased PIM1 and VEGFα expression. These cell factors accelerated the proliferation and metastasis of HCC, resulting in a feedback loop between HCC cells and M2 macrophages.
Conclusion
The study illustrates that HCC cell-derived miR-200b-3p exosomes facilitate the proliferation and polarization of macrophages by modulating cytokine secretion and the JAK/STAT signaling pathway, leading to the metastasis of HCC. These findings demonstrate the existence of a novel feedback loop between cancer cells and immune cells in the tumor microenvironment, presenting a new concept in cancer research.
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Availability of data and materials
The datasets used and analyzed during the current study are available from the corresponding author upon reasonable request.
Availability of data and material
All data are available in a public, open-access repository.
Change history
28 November 2023
A Correction to this paper has been published: https://doi.org/10.1007/s12072-023-10614-w
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Medical and health science and Technology Development of Shandong (202104080599); Natural Science Foundation of Shandong Province (ZR2022QH066).
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YX supervised the study, supported the fund, wrote the manuscript, designed experiments, and constructed figures. GL analyzed some partial data and figures and collected clinical samples. Feng Liu disposed of the review of clinicopathological specimens and guaranteed their source of them. ZL contributed to clinical sample collection and savings. ZL was in charge of in vivo experiments, for example, nude mice were fed and cared for, and subcutaneous tumors were measured. YZ installed and disposed of the data from databases and software. TY managed the color blending of the figures and checked the article format.
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Ying Xu, Guangchao Luan, Feng Liu, Yuhua Zhang, Zhongchao Li, Ziming Liu and Tao Yang declare that they have no conflicts of interest in this work.
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All procedures involving human participants were performed in accordance with Harbin Medical University’s ethical committee. All patients provided their written informed consent. The study protocol was approved by the institution’s ethics committee research.
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Xu, Y., Luan, G., Liu, F. et al. Exosomal miR-200b-3p induce macrophage polarization by regulating transcriptional repressor ZEB1 in hepatocellular carcinoma. Hepatol Int 17, 889–903 (2023). https://doi.org/10.1007/s12072-023-10507-y
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DOI: https://doi.org/10.1007/s12072-023-10507-y