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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Cell+Biol 2016 ; 18 (6): 632-44 Nephropedia Template TP
Welte T; Kim IS; Tian L; Gao X; Wang H; Li J; Holdman XB; Herschkowitz JI; Pond A; Xie G; Kurley S; Nguyen T; Liao L; Dobrolecki LE; Mo Q; Edwards DP; Huang S; Xin L; Xu J; Li Y; Lewis MT; Wang T; Westbrook TF; Rosen JM; Zhang XHF
Nat Cell Biol 2016[Jun]; 18 (6): 632-44 PMID27183469show ga
Myeloid-derived suppressor cells (MDSCs) play critical roles in primary and metastatic cancer progression. While MDSC regulation is widely variable even within patients harboring the same type of malignancy, the mechanisms governing such heterogeneity are largely unknown. Here, integrating human tumor genomics and syngeneic mammary tumor models, we demonstrate that mTOR signaling in cancer cells dictates a mammary tumor?s ability to stimulate MDSC accumulation through regulating G-CSF. Inhibiting this pathway or its activators (e.g., FGFR) impairs tumor progression, which is partially rescued by restoring MDSCs or G-CSF. Tumor-initiating cells (TICs) exhibit elevated G-CSF. MDSCs reciprocally increase TIC frequency through activating Notch in tumor cells, forming a feed-forward loop. Analyses of primary breast cancers and patient-derived xenografts (PDXs) corroborate these mechanisms in patients. These findings establish a non-canonical oncogenic role of mTOR signaling in recruiting pro-tumorigenic MDSCs and show how defined cancer subsets may evolve to promote and depend upon a distinct immune microenvironment.