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Kurth, Isabel; Yamaguchi, Norihiro; Andreu-Agullo, Celia; Tian, Helen S; Sridhar, Subhasree; Takeda, Shugaku; Gonsalves, Foster C; Loo, Jia Min; Barlas, Afsar; Manova-Todorova, Katia; Busby, Robert; Bendell, Johanna C; Strauss, James; Fakih, Marwan; McRee, Autumn J; Hendifar, Andrew E; Rosen, Lee S; Cercek, Andrea; Wasserman, Robert; Szarek, Michael; Spector, Scott L; Raza, Syed; Tavazoie, Masoud F; Tavazoie, Sohail F
Science advances, 10/2021, Volume: 7, Issue: 41Journal Article
Colorectal cancer (CRC) is a leading cause of cancer mortality. Creatine metabolism was previously shown to critically regulate colon cancer progression. We report that RGX-202, an oral small-molecule SLC6A8 transporter inhibitor, robustly inhibits creatine import in vitro and in vivo, reduces intracellular phosphocreatine and ATP levels, and induces tumor apoptosis. RGX-202 suppressed CRC growth across KRAS wild-type and KRAS mutant xenograft, syngeneic, and patient-derived xenograft (PDX) tumors. Antitumor efficacy correlated with tumoral expression of creatine kinase B. Combining RGX-202 with 5-fluorouracil or the DHODH inhibitor leflunomide caused regressions of multiple colorectal xenograft and PDX tumors of distinct mutational backgrounds. RGX-202 also perturbed creatine metabolism in patients with metastatic CRC in a phase 1 trial, mirroring pharmacodynamic effects on creatine metabolism observed in mice. This is, to our knowledge, the first demonstration of preclinical and human pharmacodynamic activity for creatine metabolism targeting in oncology, thus revealing a critical therapeutic target.
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