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A Positive Feedback Loop between Sestrin2 and mTORC Is Required for the Survival of Glutamine-Depleted Lung Cancer Cells

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Author(s)
Jun-Kyu ByunYeon-Kyung ChoiJi-Hyun KimJi Yun JeongHui-Jeon JeonMi-Kyung KimIlseon HwangYou Mie LeeIn-Kyu LeeKeun-Gyu ParkShin-Yup Lee
Keimyung Author(s)
Kim, Mi KyungHwang, Il Seon
Department
Dept. of Internal Medicine (내과학)
Journal Title
Cell Reports
Issued Date
2018
Volume
20
Issue
3
Keyword
Sestrin 2glutamine depletionmTORC1mTORC2
Abstract
Proper regulation of mTORC1 and mTORC2 upon nutrient starvation is critical for cancer cell survival. Upregulation of Sestrin2 in response to glutamine deprivation rescues cell death by suppressing mTORC1. However, the contribution of mTORC2 to Sestrin2-mediated mTORC1 suppression remains unclear. Here, we report that both Sestrin2 and mTORC2 are upregulated in glutamine-depleted lung cancer cells. Moreover, glutamine depletion caused Sestrin2 to associate with mTORC2, which was required for the increase in Sestrin2 protein stability and the reduction in mTORC1 activity. Ultimately, differential regulation of mTORC1 and 2 by Sestrin2 reprogramed lipid metabolism and enabled glutamine-depleted lung cancer cells to survive by maintaining energy and redox balance. Importantly, combined inhibition of glutamine utilization and Sestrin2 induced lung cancer cell death both in vitro and in vivo. This study shows that differential Sestrin2-mediated regulation of mTORC1 and mTORC2 is necessary for the survival of glutamine-depleted lung cancer cells.
Keimyung Author(s)(Kor)
김미경
황일선
Publisher
School of Medicine (의과대학)
Citation
Jun-Kyu Byun et al. (2018). A Positive Feedback Loop between Sestrin2 and mTORC Is Required for the Survival of Glutamine-Depleted Lung Cancer Cells. Cell Reports, 20(3), 586–599. doi: 10.1016/j.celrep.2017.06.066
Type
Article
ISSN
2211-1247
DOI
10.1016/j.celrep.2017.06.066
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/41039
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Internal Medicine (내과학)
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