Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/76377
Title: Halofuginone dually regulates autophagic flux through nutrient-sensing pathways in colorectal cancer
Authors: Chen, GQ
Gong, RH
Yang, DJ
Zhang, G
Lu, AP
Yan, SC 
Lin, SH
Bian, ZX
Issue Date: 2017
Publisher: Nature Publishing Group
Source: Cell death & disease, 2017, v. 8, e2789 How to cite?
Journal: Cell death & disease 
Abstract: Autophagy has a key role in metabolism and impacts on tumorigenesis. Our previous study found that halofuginone (HF) exerts anticancer activity in colorectal cancer (CRC) by downregulating Akt/mTORC1 (mechanistic target of rapamycin complex 1) signaling pathway. But whether and how HF regulates autophagy and metabolism to inhibit cancer growth remains an open question. Here, we unveil that HF activates ULK1 by downregulation of its phosphorylation site at Ser757 through Akt/mTORC1 signaling pathway, resulting in induction of autophagic flux under nutrient-rich condition. On the other hand, HF inactivates ULK1 by downregulation of its phosphorylation sites at Ser317 and Ser777 through LKB1/AMPK signaling pathway, resulting in autophagic inhibition under nutrient-poor condition. Furthermore, Atg7-dependent autophagosome formation is also induced under nutrient-rich condition or blocked in nutrient-poor environment, respectively, upon HF treatment. More interestingly, we also found that HF inhibits glycolysis under nutrient-rich condition, whereas inhibits gluconeogenesis under nutrient-poor condition in an Atg7-dependent manner, suggesting that autophagy has a pivotal role of glucose metabolism upon HF treatment. Subsequent studies showed that HF treatment retarded tumor growth in xenograft mice fed with either standard chow diet or caloric restriction through dual regulation of autophagy in vivo. Together, HF has a dual role in autophagic modulation depending on nutritional conditions for anti-CRC.
URI: http://hdl.handle.net/10397/76377
ISSN: 2041-4889
DOI: 10.1038/cddis.2017.203
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