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RAS-driven oncogenesis is supported by downstream antioxidant programs

Jonathan K M Lim1, Gabriel Leprivier1, Poul H Sorensen2,3

  • 1Department of Neuropathology, Heinrich Heine University, Düsseldorf, Germany.

Molecular & Cellular Oncology
|January 30, 2020
PubMed

Insights

Oncogenic RAS transformation upregulates the cystine/glutamate transporter SLC7A11 (XCT). This enhances glutathione production, helping RAS-transformed cells manage oxidative stress during tumorigenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Oncogenic RAS proteins are key drivers of cell transformation and tumor development.
  • Cancer cells often exhibit increased oxidative stress, necessitating adaptive mechanisms for survival.
  • The cystine/glutamate transporter SLC7A11 (XCT) plays a role in cellular redox balance.

Purpose of the Study:

  • To investigate the role of SLC7A11 (XCT) in RAS-mediated cell transformation and tumorigenesis.
  • To elucidate the mechanism by which RAS influences antioxidant pathways.
  • To determine if SLC7A11 (XCT) expression is a target for RAS-driven cancer adaptation.

Main Methods:

  • Analysis of gene expression in RAS-transformed cells.
  • Assessment of glutathione biosynthesis pathways.
  • Evaluation of oxidative stress markers in cancer cells.
  • In vivo studies to confirm the role of SLC7A11 (XCT) in tumor growth.

Main Results:

  • Transcriptional induction of SLC7A11 (XCT) was observed in oncogenic RAS-transformed cells.
  • Increased SLC7A11 (XCT) expression correlated with enhanced glutathione biosynthesis.
  • RAS-transformed cells showed reduced oxidative stress, attributed to elevated glutathione levels.
  • Inhibition of SLC7A11 (XCT) impaired tumor growth in vivo.

Conclusions:

  • Oncogenic RAS promotes tumorigenesis by upregulating SLC7A11 (XCT), a critical antioxidant.
  • SLC7A11 (XCT)-mediated glutathione synthesis is essential for RAS-transformed cells to cope with oxidative stress.
  • Targeting SLC7A11 (XCT) represents a potential therapeutic strategy against RAS-driven cancers.

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