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Author Spotlight: Tracing the Ferroptotic Signatures and Cell Death Dynamics in Medulloblastoma for Advanced Therapeutics
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Selenium-Thioredoxin Axis Contributes to Ferroptosis Resistance in Pancreatic Cancer Cells
Arslan Amer1, Micah Idowu1, Aqsa Ahsan1
1Department of Biological Sciences, Michigan Technological University, Houghton, MI 49931, USA.
International Journal of Molecular Sciences
|February 27, 2026
Summary
Pancreatic cancer cells show varied responses to ferroptosis. A selenium-thioredoxin pathway, independent of GPX4, confers resistance in epithelial cells, suggesting new therapeutic targets.
Area of Science:
- Oncology
- Cell Biology
- Biochemistry
Background:
- Pancreatic ductal adenocarcinoma (PDAC) exhibits significant heterogeneity in cysteine dependency and ferroptosis sensitivity.
- Two PDAC subtypes, mesenchymal-like and epithelial-type, display distinct vulnerabilities and resistance mechanisms.
- Current understanding of ferroptosis resistance in PDAC requires further elucidation of underlying pathways.
Purpose of the Study:
- To investigate the mechanisms of ferroptosis resistance in epithelial-type PDAC cells.
- To identify novel pathways contributing to ferroptosis resistance beyond glutathione peroxidase 4 (GPX4).
- To explore the role of selenium and thioredoxin reductases in PDAC ferroptosis.
Main Methods:
- Comparative analysis of PDAC subtypes based on epithelial-mesenchymal transition (EMT) status.
- Assessment of ferroptosis sensitivity upon cystine deprivation or system xc- inhibition.
- Evaluation of selenium supplementation effects on ferroptosis and glutathione (GSH) levels.
- Investigation of thioredoxin reductases (TrxR1 and TrxR2) inhibition on ferroptosis sensitivity and selenium protection.
Main Results:
- Mesenchymal-like PDAC cells are cysteine-dependent and sensitive to ferroptosis, while epithelial-type cells are resistant.
- Selenium supplementation protects against ferroptosis independently of GPX4 and GSH levels.
- Epithelial-type cells utilize both TrxR1 and TrxR2 for ferroptosis resistance.
- Inhibition of thioredoxin reductases abrogates selenium-mediated protection and sensitizes cells to ferroptosis.
Conclusions:
- A novel selenium-thioredoxin redox axis, independent of GPX4, confers ferroptosis resistance in epithelial-type PDAC.
- Targeting cysteine metabolism and thioredoxin reductases presents a potential therapeutic strategy for resistant PDAC subtypes.
- Understanding PDAC heterogeneity is crucial for developing effective ferroptosis-based cancer therapies.
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