Cited by 1,876Cell death mechanisms and regulationFerroptosis and cancer prognosisProtein Kinase Regulation and GTPase Signaling

Synthetic lethal screening identifies compounds activating iron-dependent, nonapoptotic cell death in oncogenic-RAS-harboring cancer cells.

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Yang, Wan Seok, Stockwell, Brent R.·2008·Chemistry & Biology

Abstract

We screened small molecules to identify two compounds, which we named RSL3 and RSL5, that have increased lethality in the presence of oncogenic RAS. Counter screening with biologically active compounds defined aspects of the mechanism of action for RSL3 and RSL5, such as a nonapoptotic, MEK-dependent, and iron-dependent oxidative cell death. Erastin, a previously reported compound with RAS-selective lethality, showed similar properties. RNA interference experiments targeting voltage-dependent anion channel 3 (VDAC3), a target of erastin, demonstrated that RSL5 is a scaffold that acts through VDACs to activate the observed pathway. RSL3 activated a similar death mechanism but in a VDAC-independent manner. We found that cells transformed with oncogenic RAS have increased iron content relative to their normal cell counterparts through upregulation of transferrin receptor 1 and downregulation of ferritin heavy chain 1 and ferritin light chain.

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Crossref · 10.1016/j.chembiol.2008.02.010

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  • Depletion of intracellular glutathione reduces GPX functionality.

    “Under normal circumstances, glutathione peroxidase (GPX) neutralizes lipid peroxide to lipid alcohols, but the depletion of intracellular glutathione (GSH, GPX substrate) reduces GPX functionality (Yang and Stockwell, 2008; Friedmann Angeli et al., 2014).”

    From Toxic Concentrations of Glutamate Induce Ferroptosis without Affecting Mitochondrial Respiration in Rodent Brain Slice Cultures (2026) · cites this paper as Yang and Stockwell, 2008

    In the Mechanism of Action Study section (page unavailable), reduced glutathione (GSH) appears only in a list of compounds considered for cell-death experiments. Searches for GPX, glutathione peroxidase, and glutathione depletion found no passage linking intracellular GSH depletion to reduced GPX functionality. (LLM, conf=0.76)

    Experimental — accuracy not yet measured
  • Iron depletion by chelators or PHKG2 knockdown inhibits ferroptosis.

    “the ferroptosis-inhibiting effect of iron depletion by either chelators [539, 543, 548] or phosphorylase kinase catalytic subunit gamma 2 (PHKG2) knockdown [566]”
  • Erastin- and RSL3-induced death is non-apoptotic, occurring without apoptotic hallmarks and even when core apoptosis machinery is suppressed.

    “The mode of cell death induced by these compounds was surprisingly found to be non-apoptotic, as cells treated with erastin and RSL3 died in the absence of apoptotic hallmarks [11, 12, 13], and in cells where the core apoptosis machinery – caspases, BAX, and BAK was suppressed [14].”

    From Ferroptosis: Death by Lipid Peroxidation (2016) · cites this paper as [12]

  • Erastin and RSL3 were the first compounds found to induce ferroptosis, identified through high-throughput small-molecule screening.

    “The first ferroptosis-inducing compounds, erastin [11] and RSL3 [12], were discovered using high-throughout screening of small molecule libraries [11, 12].”

    From Ferroptosis: Death by Lipid Peroxidation (2016) · cites this paper as [12]

  • RSL3-induced death shares iron, MEK, and ROS dependencies with erastin-mediated ferroptosis.

    “Cell death induced by RSL3 shares common features with erastin-mediated ferroptosis, such as iron, MEK, and ROS dependencies [12].”

    From Ferroptosis: Death by Lipid Peroxidation (2016) · cites this paper as [12]

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Authors
Yang, W. S., & Stockwell, B. R.
Affiliations
Columbia University (US)
Corresponding author
Stockwell, Brent R.
Venue
Chemistry & Biology
Publisher
Elsevier BV
Published
2008-03
Volume
15
Issue
3
Pages
234-245
ISSN
1074-5521 (ISSN-L)
OpenAlex
W2114138419
Cited by
1,876
References
35
Citations by year
2026: 138 · 2025: 231 · 2024: 319 · 2023: 312 · 2022: 271 · 2021: 202 · 2020: 135 · 2019: 66 · 2018: 58 · 2017: 38 · 2016: 35 · 2015: 19 · 2014: 11 · 2013: 7 · 2012: 10
FWCI
3.16
Type
journal article
Language
en
Open access
Locations
  • Chemistry & Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Cancer Institute (R01CA097061)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Ferroptosis and cancer prognosis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
synthetic lethality, oncogenic Ras, RSL3, erastin, non-apoptotic cell death, iron-dependent cell death, oxidative cell death, VDAC3, voltage-dependent anion channel, transferrin receptor 1, ferritin, iron metabolism, small molecule screening, cancer cell death
MeSH terms
Drug Evaluation, Preclinical, Humans, Iron, Mutation, Neoplasms, Piperazines, Substrate Specificity, Gene Expression Regulation, Neoplastic, Proto-Oncogene Proteins p21(ras), Cell Death, Apoptosis, Cell Line, Tumor, Voltage-Dependent Anion Channels, Small Molecule Libraries

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