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TFE3-SLC36A1 axis promotes resistance to glucose starvation in kidney cancer cells

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单位: [1]Department of Biochemistry and Molecular Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology,13 Hangkong Road, Wuhan, China 430030. [2]Cell Architecture Research Institute, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China. [3]Department and Institute of Urology,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,China.
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关键词: kidney cancer transcription factor O-GlcNAcylation amino acid transporter

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Higher demand for nutrients including glucose is characteristic of cancer. "Starving cancer" has been pursued to curb tumor progression. An ,intriguing regime is to inhibit glucose transporter GLUT1 in cancer cells. In addition, during cancer progression, cancer cells may suffer from insufficient glucose supply. Yet cancer cells can somehow tolerate glucose starvation. Uncovering the underlying mechanisms shall not only shed insight into cancer progression but also benefit cancer therapy. TFE3 is a transcription factor known to activate autophagic genes. Physiological TFE3 activity is regulated by phosphorylation-triggered translocation responsive to nutrient status. We recently reported TFE3 constitutively localizes to the cell nucleus and promotes cell proliferation in kidney cancer even under nutrient replete condition. Whether and how TFE3 responds to glucose starvation remain unclear. In this study, we show TFE3 promotes kidney cancer cell resistance to glucose starvation by exposing cells to physiologically relevant glucose concentration. We find glucose starvation triggers TFE3 protein stabilization through increasing its O-GlcNAcylation. Furthermore, through an unbiased functional genomic study, we identify SLC36A1, a lysosomal amino acid transporter, as a TFE3 target gene sensitive to TFE3 protein level. We find SLC36A1 is overexpressed in kidney cancer, which promotes mTOR activity and kidney cancer cell proliferation. Importantly, SLC36A1 level is induced by glucose starvation through TFE3, which enhances cellular resistance to glucose starvation. Suppressing TFE3 or SLC36A1 significantly increases cellular sensitivity to GLUT1 inhibitor in kidney cancer cells. Collectively, we uncover a functional TFE3-SLC36A1 axis that responds to glucose starvation and enhances starvation tolerance in kidney cancer.Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.

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出版当年[2023]版:
大类 | 2 区 生物学
小类 | 2 区 生化与分子生物学
最新[2025]版:
大类 | 2 区 生物学
小类 | 2 区 生化与分子生物学
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第一作者单位: [1]Department of Biochemistry and Molecular Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology,13 Hangkong Road, Wuhan, China 430030.
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通讯机构: [1]Department of Biochemistry and Molecular Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology,13 Hangkong Road, Wuhan, China 430030. [2]Cell Architecture Research Institute, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China.
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