Abstract
Three limonoid natural products with selective anti-proliferative activity against BRAF(V600E) and NRAS(Q61K)-mutation-dependent melanoma cell lines were identified. Differential transcriptome analysis revealed dependency of compound activity on expression of the mitochondrial cytochrome P450 oxidase CYP27A1, a transcriptional target of melanogenesis-associated transcription factor (MITF). We determined that CYP27A1 activity is necessary for the generation of a reactive metabolite that proceeds to inhibit cellular proliferation. A genome-wide small interfering RNA screen in combination with chemical proteomics experiments revealed gene-drug functional epistasis, suggesting that these compounds target mitochondrial biogenesis and inhibit tumor bioenergetics through a covalent mechanism. Our work suggests a strategy for melanoma-specific targeting by exploiting the expression of MITF target gene CYP27A1 and inhibiting mitochondrial oxidative phosphorylation in BRAF mutant melanomas.
Keywords:
BRAF; CYP27A1; MITF; cancer metabolism; melanoma; mitochondrial complex I; natural products; oncology; oxidative phosphorylation; prodrug.
Copyright © 2021 Elsevier Ltd. All rights reserved.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Antineoplastic Agents / chemistry
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Antineoplastic Agents / metabolism
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Antineoplastic Agents / pharmacology
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Antineoplastic Agents / therapeutic use
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Biological Products / chemistry
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Biological Products / metabolism
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Biological Products / pharmacology
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Biological Products / therapeutic use
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Cell Line, Tumor
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Cell Proliferation / drug effects
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Cholestanetriol 26-Monooxygenase / antagonists & inhibitors
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Cholestanetriol 26-Monooxygenase / genetics
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Cholestanetriol 26-Monooxygenase / metabolism*
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Humans
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Limonins / chemistry
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Limonins / metabolism
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Limonins / pharmacology*
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Limonins / therapeutic use
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Melanoma / drug therapy
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Melanoma / pathology
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Microphthalmia-Associated Transcription Factor / genetics
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Microphthalmia-Associated Transcription Factor / metabolism
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Mitochondria / drug effects*
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Mitochondria / metabolism
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Oxidative Phosphorylation / drug effects
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Promoter Regions, Genetic
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Protein Binding
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Proto-Oncogene Proteins B-raf / antagonists & inhibitors
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Proto-Oncogene Proteins B-raf / genetics
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Proto-Oncogene Proteins B-raf / metabolism
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RNA Interference
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RNA, Small Interfering / metabolism
Substances
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Antineoplastic Agents
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Biological Products
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Limonins
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MITF protein, human
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Microphthalmia-Associated Transcription Factor
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RNA, Small Interfering
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CYP27A1 protein, human
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Cholestanetriol 26-Monooxygenase
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Proto-Oncogene Proteins B-raf