MITF regulates IDH1, NNT, and a transcriptional program protecting melanoma from reactive oxygen species

Sci Rep. 2024 Sep 14;14(1):21527. doi: 10.1038/s41598-024-72031-9.

Abstract

Microphthalmia-associated transcription factor (MITF) is a master regulator of melanocyte function, development and plays a significant role in melanoma pathogenesis. MITF genomic amplification promotes melanoma development, and it can facilitate resistance to multiple therapies. Here, we show that MITF regulates a global antioxidant program that increases survival of melanoma cell lines by protecting the cells from reactive oxygen species (ROS)-induced damage. In addition, this redox program is correlated with MITF expression in human melanoma cell lines and patient-derived melanoma samples. Using a zebrafish melanoma model, we show that MITF decreases ROS-mediated DNA damage in vivo. Some of the MITF target genes involved, such as IDH1 and NNT, are regulated through direct MITF binding to canonical enhancer box (E-BOX) sequences proximal to their promoters. Utilizing functional experiments, we demonstrate the role of MITF and its target genes in reducing cytosolic and mitochondrial ROS. Collectively, our data identify MITF as a significant driver of the cellular antioxidant state.

MeSH terms

  • Animals
  • Cell Line, Tumor
  • DNA Damage
  • Gene Expression Regulation, Neoplastic*
  • Humans
  • Isocitrate Dehydrogenase* / genetics
  • Isocitrate Dehydrogenase* / metabolism
  • Melanoma* / genetics
  • Melanoma* / metabolism
  • Melanoma* / pathology
  • Microphthalmia-Associated Transcription Factor* / genetics
  • Microphthalmia-Associated Transcription Factor* / metabolism
  • Reactive Oxygen Species* / metabolism
  • Transcription, Genetic
  • Zebrafish Proteins / genetics
  • Zebrafish Proteins / metabolism
  • Zebrafish*

Substances

  • Microphthalmia-Associated Transcription Factor
  • Reactive Oxygen Species
  • Isocitrate Dehydrogenase
  • MITF protein, human
  • IDH1 protein, human
  • Zebrafish Proteins