1. Response of BRAF-mutant melanoma to BRAF inhibition is mediated by a network of transcriptional regulators of glycolysis.
- Author
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Parmenter TJ, Kleinschmidt M, Kinross KM, Bond ST, Li J, Kaadige MR, Rao A, Sheppard KE, Hugo W, Pupo GM, Pearson RB, McGee SL, Long GV, Scolyer RA, Rizos H, Lo RS, Cullinane C, Ayer DE, Ribas A, Johnstone RW, Hicks RJ, and McArthur GA
- Subjects
- Cell Line, Tumor, Drug Resistance, Neoplasm drug effects, HEK293 Cells, Humans, Indoles pharmacology, MAP Kinase Signaling System drug effects, Melanoma pathology, Piperazines pharmacology, Pyridines pharmacology, Sulfonamides pharmacology, Transcription Factors genetics, Transcription Factors metabolism, Vemurafenib, Glycolysis drug effects, Melanoma genetics, Protein Kinase Inhibitors pharmacology, Proto-Oncogene Proteins B-raf antagonists & inhibitors, Proto-Oncogene Proteins B-raf genetics
- Abstract
Unlabelled: Deregulated glucose metabolism fulfills the energetic and biosynthetic requirements for tumor growth driven by oncogenes. Because inhibition of oncogenic BRAF causes profound reductions in glucose uptake and a strong clinical benefit in BRAF-mutant melanoma, we examined the role of energy metabolism in responses to BRAF inhibition. We observed pronounced and consistent decreases in glycolytic activity in BRAF-mutant melanoma cells. Moreover, we identified a network of BRAF-regulated transcription factors that control glycolysis in melanoma cells. Remarkably, this network of transcription factors, including hypoxia-inducible factor-1α, MYC, and MONDOA (MLXIP), drives glycolysis downstream of BRAF(V600), is critical for responses to BRAF inhibition, and is modulated by BRAF inhibition in clinical melanoma specimens. Furthermore, we show that concurrent inhibition of BRAF and glycolysis induces cell death in BRAF inhibitor (BRAFi)-resistant melanoma cells. Thus, we provide a proof-of-principle for treatment of melanoma with combinations of BRAFis and glycolysis inhibitors., Significance: BRAF is suppress glycolysis and provide strong clinical benefi t in BRAF V600 melanoma. We show that BRAF inhibition suppresses glycolysis via a network of transcription factors that are critical for complete BRAFi responses. Furthermore, we provide evidence for the clinical potential of therapies that combine BRAFis with glycolysis inhibitors.
- Published
- 2014
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