Journal
CELL METABOLISM
Volume 29, Issue 5, Pages 1135-+Publisher
CELL PRESS
DOI: 10.1016/j.cmet.2019.01.002
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Funding
- NIH [1R01DK62277, 1R01DK100287, 1R01DK116993]
- Endowed Chair for Experimental Pathology
- Deutsche Forschungsgemeinschaft (DFG) [SFB 974]
- [T32CA186873]
- [R01CA204586]
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Based on their lobule location, hepatocytes display differential gene expression, including pericentral hepatocytes that surround the central vein, which are marked by Wnt-beta-catenin signaling. Activating beta-catenin mutations occur in a variety of liver tumors, including hepatocellular carcinoma (HCC), but no specific therapies are available to treat these tumor subsets. Here, we identify a positive relationship between beta-catenin activation, its transcriptional target glutamine synthetase (GS), and p-mTOR-S2448, an indicator of mTORC1 activation. In normal livers of mice and humans, pericentral hepatocytes were simultaneously GS and p-mTOR-S2448 positive, as were beta-catenin-mutated liver tumors. Genetic disruption of beta-catenin signaling or GS prevented p-mTOR-S2448 expression, while its forced expression in beta-catenin-deficient livers led to ectopic p-mTOR-S2448 expression. Further, we found notable therapeutic benefit of mTORC1 inhibition in mutant-beta-catenin-driven HCC through suppression of cell proliferation and survival. Thus, mTORC1 inhibitors could be highly relevant in the treatment of liver tumors that are beta-catenin mutated and GS positive.
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