PMID- 32708687 OWN - NLM STAT- MEDLINE DCOM- 20210222 LR - 20210222 IS - 1422-0067 (Electronic) IS - 1422-0067 (Linking) VI - 21 IP - 14 DP - 2020 Jul 16 TI - Role of Flavonoids in the Prevention of AhR-Dependent Resistance During Treatment with BRAF Inhibitors. LID - 10.3390/ijms21145025 [doi] LID - 5025 AB - BRAF and MEK inhibitors (BRAFi and MEKi) are the standard of care for the treatment of metastatic melanoma in patients with BRAF(V600E) mutations, greatly improving progression-free survival. However, the acquisition of resistance to BRAFi and MEKi remains a difficult clinical challenge, with limited therapeutic options available for these patients. Here, we investigated the therapeutic potential of natural flavonoids as specific AhR (Aryl hydrocarbon Receptor) transcription factor antagonists in combination with BRAFi. EXPERIMENTAL DESIGN: Experiments were performed in vitro and in vivo with various human melanoma cell lines (mutated for BRAF(V600E)) sensitive or resistant to BRAFi. We evaluated the role of various flavonoids on cell sensitivity to BRAFi and their ability to counteract resistance and the invasive phenotype of melanoma. RESULTS: Flavonoids were highly effective in potentiating BRAFi therapy in human melanoma cell lines by increasing sensitivity and delaying the pool of resistant cells that arise during treatment. As AhR antagonists, flavonoids counteracted a gene expression program associated with the acquisition of resistance and phenotype switching that leads to an invasive and EMT-like phenotype. CONCLUSIONS: The use of natural flavonoids opens new therapeutic opportunities for the treatment of patients with BRAF-resistant disease. FAU - Leclair, Heloise M AU - Leclair HM AD - Institut de Genetique et Developpement de Rennes, University Rennes-UMR6290, F-35000 Rennes, France. FAU - Tardif, Nina AU - Tardif N AUID- ORCID: 0000-0002-9855-2350 AD - Institut de Genetique et Developpement de Rennes, University Rennes-UMR6290, F-35000 Rennes, France. FAU - Paris, Anais AU - Paris A AD - Institut de Genetique et Developpement de Rennes, University Rennes-UMR6290, F-35000 Rennes, France. FAU - Galibert, Marie-Dominique AU - Galibert MD AUID- ORCID: 0000-0003-0095-742X AD - Institut de Genetique et Developpement de Rennes, University Rennes-UMR6290, F-35000 Rennes, France. AD - Department of Molecular Genetics and Genomics, Hospital University of Rennes, F-35000 Rennes, France. FAU - Corre, Sebastien AU - Corre S AUID- ORCID: 0000-0003-1532-5660 AD - Institut de Genetique et Developpement de Rennes, University Rennes-UMR6290, F-35000 Rennes, France. LA - eng GR - NA/ARC Foundation, France/ GR - NA/Aviesan ITMO Cancer/ GR - NA/INCA, France/ PT - Journal Article DEP - 20200716 PL - Switzerland TA - Int J Mol Sci JT - International journal of molecular sciences JID - 101092791 RN - 0 (AHR protein, human) RN - 0 (Basic Helix-Loop-Helix Transcription Factors) RN - 0 (Flavonoids) RN - 0 (Protein Kinase Inhibitors) RN - 0 (Receptors, Aryl Hydrocarbon) RN - EC 2.7.11.1 (BRAF protein, human) RN - EC 2.7.11.1 (Proto-Oncogene Proteins B-raf) SB - IM MH - Animals MH - Basic Helix-Loop-Helix Transcription Factors/*antagonists & inhibitors/metabolism MH - Cell Line, Tumor MH - Chick Embryo MH - Drug Resistance, Neoplasm/*drug effects MH - Flavonoids/*pharmacology MH - Humans MH - Melanoma/*drug therapy/metabolism MH - Models, Molecular MH - Protein Kinase Inhibitors/*pharmacology MH - Proto-Oncogene Proteins B-raf/*antagonists & inhibitors/metabolism MH - Receptors, Aryl Hydrocarbon/*antagonists & inhibitors/metabolism PMC - PMC7404066 OTO - NOTNLM OT - AhR OT - BRAF inhibitor OT - flavonoids OT - melanoma OT - resistance COIS- The authors declare no conflict of interest EDAT- 2020/07/28 06:00 MHDA- 2021/02/23 06:00 PMCR- 2020/07/01 CRDT- 2020/07/26 06:00 PHST- 2020/06/02 00:00 [received] PHST- 2020/07/03 00:00 [revised] PHST- 2020/07/09 00:00 [accepted] PHST- 2020/07/26 06:00 [entrez] PHST- 2020/07/28 06:00 [pubmed] PHST- 2021/02/23 06:00 [medline] PHST- 2020/07/01 00:00 [pmc-release] AID - ijms21145025 [pii] AID - ijms-21-05025 [pii] AID - 10.3390/ijms21145025 [doi] PST - epublish SO - Int J Mol Sci. 2020 Jul 16;21(14):5025. doi: 10.3390/ijms21145025.