Abstract
Macrophage-mediated tumor cell phagocytosis and subsequent neoantigen presentation are critical for generating anti-tumor immunity. This study aimed to uncover the potential clinical value and molecular mechanisms of miRNA-22 (miR-22) in tumor cell phagocytosis via macrophages and more efficient T cell priming. We found that miR-22 expression was markedly downregulated in primary macrophages from glioma tissue samples compared to adjacent tissues. miR-22-overexpressing macrophages inhibited glioma cell proliferation and migration, respectively. miR-22 upregulation stimulated the phagocytic ability of macrophages, enhanced tumor cell phagocytosis, antigen presentation, and efficient T cell priming. Additionally, our data revealed that miR-22-overexpressing macrophages inhibited glioma formation in vivo, HDAC6 was a target, and NF-κB signaling was a pathway closely associated with miR-22 in tumor-associated macrophages (TAMs) of glioma. Our findings revealed the essential roles of miR-22 in tumor cell phagocytosis by macrophages and more efficient T cell priming, facilitating further research on phagocytic regulation to enhance the response to tumor immunotherapy.
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Change history
31 March 2022
A Correction to this paper has been published: https://doi.org/10.1038/s41388-022-02282-1
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Funding
This study was supported by the National Natural Science Foundation of China (31900616, 81673444, 82003795), The project of improvement of the scientific ability of Anhui Medical University (2020xkjT009), Natural Science Foundation of Anhui Province for young scholars (1908085QH379) and The Open Fund of Key Laboratory of Anti-inflammatory and Immune Medicine, Ministry of Education, P.R. China, Anhui Medical University (KFJJ-2021-01).
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JT and YF performed the experiments and drafted the manuscript. DH, XT, ZX, HJ, XW, WH, and WW revised the manuscript.
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Patients with glioma were recruited from the First Affiliated Hospital of Anhui Medical University, approved by the Medicine Research Ethics Committee of Anhui Medical University. All glioma patients gave informed consent to relevant experimental protocols. All animal experiments were performed in accordance with the guidelines of the Institutional Laboratory Animal Care and Use Committee, Anhui Medical University.
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Tu, J., Fang, Y., Han, D. et al. MicroRNA-22 represses glioma development via activation of macrophage-mediated innate and adaptive immune responses. Oncogene 41, 2444–2457 (2022). https://doi.org/10.1038/s41388-022-02236-7
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DOI: https://doi.org/10.1038/s41388-022-02236-7
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