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A Kinase Inhibitor Targeted to mTORC1 Drives Regression in Glioblastoma #MMPMID28292440
Fan Q; Aksoy O; Wong RA; Ilkhanizadeh S; Novotny CJ; Gustafson WC; Truong AYQ; Cavanan G; Simonds EF; Haas-Kogan D; Phillips JJ; Nicolaides T; Okaniwa M; Shokat KM; Weiss WA
Cancer Cell 2017[Mar]; 31 (3): 424-35 PMID28292440show ga
Although signaling from PI3K and AKT to mTOR is prominently dysregulated in high-grade glial brain tumors, blockade of PI3K or AKT minimally affects downstream mTOR activity in glioma. Allosteric mTOR inhibitors, such as rapamycin, incompletely block mTORC1 compared to mTOR kinase inhibitors (TORKi). Here, we compared RapaLink-1, a TORKi linked to rapamycin, with earlier generation mTOR inhibitors. Compared to rapamycin and Rapalink-1, TORKi showed poor durability. RapaLink-1 associated with FKBP12, an abundant mTOR-interacting protein, enabling accumulation of RapaLink-1. RapaLink-1 showed better efficacy than rapamycin or TORKi, potently blocking cancer-derived, activating mutants of mTOR. Our study re-establishes mTOR as a central target in glioma and traces the failure of existing drugs to incomplete/nondurable inhibition of mTORC1.