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- W3083442015 abstract "Purpose: Autophagy is a series of processes in which biomolecules are digested and recycled, and it also provides energy for the development and progression of cancer. Thus, autophagy inhibitors can be used to suppress the progression of cancer. In this study, we investigated whether decursin, which is derived from natural products, inhibits the growth and autophagy of cancer cells. Methods: The gastric cancer cell lines SNU216 and NCI-N87 were treated with or without decursin. Cell growth was evaluated by Cell-Counting Kit-8, colony formation, and BrdU assays, as well as by propidium iodide staining, and autophagic flux was evaluated by western blotting, LC3 puncta, GFP-RFP-LC3, and transmission electron microscopy. Finally, tumor spheroids and patient-derived gastric cancer organoids were used to confirm the effect of decursin in three-dimensional culture. Results: Decursin reduced the growth and anchorage-dependent viability of gastric cancer cells. LC3 cleavage and LC3-GFP puncta were increased by decursin in a time- and concentration-dependent manner. However, the increase in autophagosome formation did not lead to an increase in autophagic flux. Decursin downregulated cathepsin C (CTSC), a lysosomal protease, irrespective of cellular pH. In addition, knockdown of CTSC reduced the mRNA and protein levels of E2F3, resulting in cell-cycle arrest. Decursin also reduced cell growth in both tumor spheroids and patient-derived gastric cancer organoids. Conclusion: The results demonstrated that decursin inhibited tumor growth and progression by suppressing CTSC-mediated autophagic flux and cell-cycle progression. Therefore, decursin is a novel inhibitor of autophagic flux, with potential for the treatment of gastric cancer. Citation Format: Solbi Kim, Mina Joo, Nayoung KIM, Myung-Won Lee, Heung Jin Jeon, Hyewon Ryu, Ik-Chan Song, Hyo Jin Lee. Decursin inhibits gastric cancer cell growth and autophagic flux by suppressing cathepsin C [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr 4170." @default.
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- W3083442015 date "2020-08-13" @default.
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- W3083442015 title "Abstract 4170: Decursin inhibits gastric cancer cell growth and autophagic flux by suppressing cathepsin C" @default.
- W3083442015 doi "https://doi.org/10.1158/1538-7445.am2020-4170" @default.
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