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Targeting Wnt-driven Cancer Through the inhibition of Porcupine by LGK974

Liu, Jun and Pan, Shifeng and Ng, Nicholas and Kasibhatla, Shailaja and Cheng, Dai and Li, Jie and Tompkins, Celin and Pferdekamper, Annemarie and Steffy, Auzon and Kowal, Colleen and Wang, Yan and Li, Chun and Wang, Tao and Mcnamara, Peter and Sellers, William and Petruzzelli, Lilli and Boral, Anthony and Seidel, Martin and Mclaughlin, Margaret and Che, Jianwei and Vanasse, K. Gary and Sun, Frank and Schuller, Alwin and Li, Allen and Cheng, Jane and Phung, Van and Guo, Guirong and Graham, Martin and Brenner, J. Chad and Villarroel, Maria and Schultz, Peter and Wu, Xu and Carey, Thomas and Hsieh, Hsin-I (2013) Targeting Wnt-driven Cancer Through the inhibition of Porcupine by LGK974. Proceedings of the National Academy of Sciences of the United States of America PNAS., 110 (50). pp. 20224-20229. ISSN 1091-6490; 0027-8424

Abstract

Wnt signaling is one of the key oncogenic pathways in multiple cancers, and targeting this pathway is an attractive therapeutic approach. However, therapeutic success has been limited because of the lack of therapeutic agents for targets in the Wnt pathway and the lack of a defined patient population that would be sensitive to a Wnt inhibitor. We developed a screen for small molecules that block Wnt secretion. This effort led to the discovery of LGK974, a potent and specific small-molecule Porcupine (PORCN) inhibitor. PORCN is a membrane-bound O-acyltransferase that is required for and dedicated to palmitoylation of Wnt ligands, a necessary step in the processing of Wnt ligand secretion. We show that LGK974 potently inhibits Wnt signaling in vitro and in vivo, including reduction of the Wnt-dependent LRP6 phosphorylation and the expression of Wnt target genes, such as AXIN2. LGK974 is potent and efficacious in multiple tumor models at well-tolerated doses in vivo, including murine and rat mechanistic breast cancer models driven by MMTV-Wnt1 and a human head and neck squamous cell carcinoma model (HN30). We also show that head and neck cancer cell lines with loss-of-function mutations in the Notch signaling pathway have a high response rate to LGK974. Together, these findings provide both a strategy and tools for targeting Wnt-driven cancers through the inhibition of PORCN.

Item Type: Article
Date Deposited: 15 Sep 2016 00:45
Last Modified: 15 Sep 2016 00:45
URI: https://oak.novartis.com/id/eprint/9504

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