Abstract
Background
Microsatellite instable (MSI) colorectal cancer (CRC) has distinct features that distinguish it from microsatellite stable CRC. While ferroptosis may play a role in the development of MSI CRC, its mechanisms remain unclear.
Methods
Ferroptosis was assessed via the detection of lipid peroxidation, malondialdehyde, 4-hydroxy-2-nonenal, and intracellular Fe2+, etc. Phosphoproteomic analysis, cytokine array, and flow cytometry were performed to explore the regulation of CD8+ T cell infiltration.
Results
Dual specificity phosphatase 4 (DUSP4) suppressed ferroptosis in MSI CRC cells by reducing lipid peroxidation and inhibiting intracellular Fe2+ accumulation. Mechanistic studies showed that DUSP4 downregulated the expression of transferrin receptor (TFRC), which was transcriptionally regulated by c-MYC. In addition, a positive correlation was observed between the infiltration of CD8+ T cells in CRC tissues and the expression of DUSP4 in cancer cells. Mechanistically, DUSP4 dephosphorylated cyclin-dependent kinase 7 (CDK7) and promoted C-X-C Motif chemokine ligand 16 (CXCL16) expression, resulting in an increased infiltration of CD8+ T cells. Importantly, the combination of a CDK7 inhibitor and anti-programmed cell death protein-1 therapy demonstrated a synergistic therapeutic effect in MSI CRC.
Conclusion
DUSP4 acts as a negative regulator of ferroptosis and a positive regulator of CD8+ T cell infiltration in MSI CRC.
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Data availability
The datasets used and/or analysed, and materials used during the current study, are available from the corresponding authors upon reasonable request.
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Acknowledgements
We thank Dr Li Yang for pathological image analysis. We acknowledge the Core Facility of Jiangsu Provincial People’s Hospital for its help in the detection of experimental samples.
Funding
This study was supported by National Science Foundation of China (82273406) and the Jiangsu Province Capability Improvement Project through Science, Technology and Education (Jiangsu Provincial Medical Key Discipline, ZDXK202222).
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Conception and design: DZ, SY, HX. Supervision: XW and YS. Development of methodology: DZ, SY, HX, and ZC. Acquisition of data: DZ, SY, HX, and ZC. Analysis and interpretation of data: DZ and SY. Writing, review and/or revision of the manuscript: DZ, SY, HX, XW, and YS.
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Approval from the Institutional Review Board of the First Affiliated Hospital of Nanjing Medical University (2022-SRFA-164) was obtained for human tissue study, and informed consent was provided by all patients involved. All animal experiments are conducted with the approval of the Committee on the Ethics of Animal Experiments of Nanjing Medical University (IACUC-2310067). All methods were performed in accordance with the relevant guidelines and regulations.
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Zhang, D., Yang, S., Xu, H. et al. The novel role of DUSP4 in suppressing ferroptosis and promoting cytotoxicity of CD8+ T cells in MSI colorectal cancer. Br J Cancer 133, 1096–1110 (2025). https://doi.org/10.1038/s41416-025-03119-w
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DOI: https://doi.org/10.1038/s41416-025-03119-w


