miR-106b-5p inhibits IRF1/IFN-β signaling to promote M2 macrophage polarization of glioblastoma

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Abstract

Purpose: The microRNA (miRNA) profile changes in the tumor-associated macrophages. However, the role of miR-106b-5p in the glioblastoma-associated macrophages is poorly understood. Materials and Methods: In our study, miR-106b-5p and M2 macrophage markers were detected by qRT-PCR and Western blotting in THP1 cells, with the conditioned medium from U251 cells or M2 macrophages in response to IL-4 stimulation and M1 macrophages stimulated by LPS and IFN-γ. IFN regulatory factor (IRF1) was identified as a target of miR-106b-5p in the glioma infiltrating macrophages by luciferase reporter assay. The molecular mechanisms involved in the miR-106b-5p-mediated regulation of M2 polarization were clarified by shRNA knockdown assay. Results: Our results showed miR-106b-5p expression was upregulated in glioma-infiltrating macrophages. miR-106b-5p regulated M2 polarization of glioma infiltrating macrophages and enhanced the growth of glioma-infiltrating macrophages. IRF1 was identified as a target of miR-106b-5p. Furthermore, miR-106b-5p inhibited IRF1 expression by targeting IRF1/ IFN-β pathway to promote M2 polarization of macrophages. Conclusion: miR-106b-5p may inhibit IRF1/IFN-β signaling to promote M2 macrophage polarization of glioblastoma, and it may become a novel target for the treatment of glioblastoma.

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Shi, Y., Zhang, B., Zhu, J., Huang, W., Han, B., Wang, Q., … Liu, F. (2020). miR-106b-5p inhibits IRF1/IFN-β signaling to promote M2 macrophage polarization of glioblastoma. OncoTargets and Therapy, 13, 7479–7492. https://doi.org/10.2147/OTT.S238975

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