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Supplemental Figures S1-S14 from Forced Activation of Notch in Macrophages Represses Tumor Growth by Upregulating miR-125a and Disabling Tumor-Associated Macrophages

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posted on 2023-03-30, 23:46 authored by Jun-Long Zhao, Fei Huang, Fei He, Chun-Chen Gao, Shi-Qian Liang, Peng-Fei Ma, Guang-Ying Dong, Hua Han, Hong-Yan Qin

Figure S1: Expression of Notch ligands and receptors in macrophages during in vitro differentiation and activation. Figure S2: Activation of Notch signaling in macrophages repressed the growth of transplanted B16F melanoma tumors. Figure S3: Activation of Notch signaling by conditional NIC expression in macrophages did not change the number of macrophages, but reduced the number of MDSCs and increased the number of CD8+ T-cells in transplanted tumors. Figure S4: miR-125a expression in BM cells and macrophages. Figure S5: miR-125a is a downstream molecule to Notch signaling in macrophages. Figure S6: Activation of Notch signaling with immobilized mD1R in macrophages promoted M1 polarization. Figure S7: Characterization of the miR-125a gene and its enhancer. Figure S8: The sequence of the first intron enhancer of Spaca6A. Figure S9: miR-125a enhanced phagocytosis of differentially activated macrophages. Figure S10: Notch signaling regulated M1 and M2 macrophage polarization. Figure S11: miR-125a regulated M1 macrophages through targeting FIH1. Figure S12: miR-125a repressed M2 macrophages through targeting IRF4. Figure S13: Self-amplification of miR-125a expression through RYBP/YY1. Figure S14: A model of the Notch signaling-mediated regulation of TAMs through miR-125a.

Funding

Ministry of Science and Technology

National Natural Science Foundation of China

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ARTICLE ABSTRACT

Tumor-associated macrophages (TAM) contribute greatly to hallmarks of cancer. Notch blockade was shown to arrest TAM differentiation, but the precise role and underlying mechanisms require elucidation. In this study, we employed a transgenic mouse model in which the Notch1 intracellular domain (NIC) is activated conditionally to define the effects of active Notch1 signaling in macrophages. NIC overexpression had no effect on TAM differentiation, but it abrogated TAM function, leading to repressed growth of transplanted tumors. Macrophage miRNA profiling identified a novel downstream mediator of Notch signaling, miR-125a, which was upregulated through an RBP-J–binding site at the first intronic enhancer of the host gene Spaca6A. miR-125a functioned downstream of Notch signaling to reciprocally influence polarization of M1 and M2 macrophages by regulating factor inhibiting hypoxia inducible factor-1α and IRF4, respectively. Notably, macrophages transfected with miR-125a mimetics increased phagocytic activity and repressed tumor growth by remodeling the immune microenvironment. We also identified a positive feedback loop for miR-125a expression mediated by RYBP and YY1. Taken together, our results showed that Notch signaling not only supported the differentiation of TAM but also antagonized their protumorigenic function through miR-125a. Targeting this miRNA may reprogram macrophages in the tumor microenvironment and restore their antitumor potential. Cancer Res; 76(6); 1403–15. ©2016 AACR.

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