CYP27A1-dependent anti-melanoma activity of limonoid natural products targets mitochondrial metabolism

Cell Chem Biol. 2021 Oct 21;28(10):1407-1419.e6. doi: 10.1016/j.chembiol.2021.03.004. Epub 2021 Mar 31.

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.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antineoplastic Agents / chemistry
  • Antineoplastic Agents / metabolism
  • Antineoplastic Agents / pharmacology
  • Antineoplastic Agents / therapeutic use
  • Biological Products / chemistry
  • Biological Products / metabolism
  • Biological Products / pharmacology
  • Biological Products / therapeutic use
  • Cell Line, Tumor
  • Cell Proliferation / drug effects
  • Cholestanetriol 26-Monooxygenase / antagonists & inhibitors
  • Cholestanetriol 26-Monooxygenase / genetics
  • Cholestanetriol 26-Monooxygenase / metabolism*
  • Humans
  • Limonins / chemistry
  • Limonins / metabolism
  • Limonins / pharmacology*
  • Limonins / therapeutic use
  • Melanoma / drug therapy
  • Melanoma / pathology
  • Microphthalmia-Associated Transcription Factor / genetics
  • Microphthalmia-Associated Transcription Factor / metabolism
  • Mitochondria / drug effects*
  • Mitochondria / metabolism
  • Oxidative Phosphorylation / drug effects
  • Promoter Regions, Genetic
  • Protein Binding
  • Proto-Oncogene Proteins B-raf / antagonists & inhibitors
  • Proto-Oncogene Proteins B-raf / genetics
  • Proto-Oncogene Proteins B-raf / metabolism
  • RNA Interference
  • RNA, Small Interfering / metabolism

Substances

  • Antineoplastic Agents
  • Biological Products
  • Limonins
  • MITF protein, human
  • Microphthalmia-Associated Transcription Factor
  • RNA, Small Interfering
  • CYP27A1 protein, human
  • Cholestanetriol 26-Monooxygenase
  • Proto-Oncogene Proteins B-raf