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- W2909024333 abstract "Abstract The role of the mTOR signaling pathway in different myeloid cell subsets is poorly understood in the context of tumor development. In this study, myeloid cell–specific Raptor knockout (KO) mice were used to determine the roles of mechanistic target of rapamycin complex 1 (mTORC1) in regulating macrophage function from Lewis lung carcinoma (LLC) s.c. tumors and lung tumor metastasis. We found no difference in tumor growth between conditional Raptor KO and control mice in the s.c. tumor models, although depletion of mTORC1 decreased the immunosuppressive function of tumor-associated macrophages (TAM). Despite the decreased immunosuppressive activity of TAM, M1-like TAM differentiation was impaired in the s.c. tumor microenvironment of mTORC1 conditional Raptor KO mice due to downregulated CD115 expression on macrophages. In addition, TNF-α production by mTORC1-deficient myeloid cells was also decreased in the s.c. LLC tumors. On the contrary, disruption of mTORC1 in myeloid cells promoted lung cancer metastasis. Accordingly, immunosuppressive interstitial macrophages/metastasis-associated macrophages (CD11b+F4/80high) were accumulated in the lungs of Raptor KO mice in the LLC lung metastasis model, leading to decreased Th1 responses. Taken together, our results demonstrate that differential tumor microenvironment dictates the immunological outcomes of myeloid cells, with mTORC1 disruption leading to different tumor growth phenotypes." @default.
- W2909024333 created "2019-01-25" @default.
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- W2909024333 date "2019-03-01" @default.
- W2909024333 modified "2023-09-24" @default.
- W2909024333 title "Tumor Microenvironment Modulates Immunological Outcomes of Myeloid Cells with mTORC1 Disruption" @default.
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- W2909024333 doi "https://doi.org/10.4049/jimmunol.1801112" @default.
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