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Wallace, Eli M; Rizzi, James P; Han, Guangzhou; Wehn, Paul M; Cao, Zhaodan; Du, Xinlin; Cheng, Tzuling; Czerwinski, Robert M; Dixon, Darryl D; Goggin, Barry S; Grina, Jonas A; Halfmann, Megan M; Maddie, Melissa A; Olive, Sarah R; Schlachter, Stephen T; Tan, Huiling; Wang, Bin; Wang, Keshi; Xie, Shanhai; Xu, Rui; Yang, Hanbiao; Josey, John A
Cancer research (Chicago, Ill.), 09/2016, Letnik: 76, Številka: 18Journal Article
More than 90% of clear cell renal cell carcinomas (ccRCC) exhibit inactivation of the von Hippel-Lindau (pVHL) tumor suppressor, establishing it as the major underlying cause of this malignancy. pVHL inactivation results in stabilization of the hypoxia-inducible transcription factors, HIF1α and HIF2α, leading to expression of a genetic program essential for the initiation and progression of ccRCC. Herein, we describe the potent, selective, and orally active small-molecule inhibitor PT2385 as a specific antagonist of HIF2α that allosterically blocks its dimerization with the HIF1α/2α transcriptional dimerization partner ARNT/HIF1β. PT2385 inhibited the expression of HIF2α-dependent genes, including VEGF-A, PAI-1, and cyclin D1 in ccRCC cell lines and tumor xenografts. Treatment of tumor-bearing mice with PT2385 caused dramatic tumor regressions, validating HIF2α as a pivotal oncogenic driver in ccRCC. Notably, unlike other anticancer agents that inhibit VEGF receptor signaling, PT2385 exhibited no adverse effect on cardiovascular performance. Thus, PT2385 represents a novel class of therapeutics for the treatment of RCC with potent preclincal efficacy as well as improved tolerability relative to current agents that target the VEGF pathway. Cancer Res; 76(18); 5491-500. ©2016 AACR.
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in: SICRIS
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