Abstract
Purpose
Transferrin receptor (TFR), a membrane protein that has a critical role in the transport of iron into cells, is known to be a ferroptosis-related marker. Although TFR is reported to be abundantly expressed in tumor cells, its relationship with ferroptosis inducers in hepatocellular carcinoma (HCC) remains unclear.
Methods
The authors performed immunohistochemical staining of TFR and divided 350 HCC patients into two groups according to its expression. They analyzed the association between TFR expression and prognosis or clinicopathologic factors. In addition, the regulation of malignant activity and its effect on the efficacy of ferroptosis inducers were investigated in vitro.
Results
For this study, 350 patients were divided into TFR-positive (n =180, 51.4%) and TFR-negative (n = 170, 48.6%) groups. The TFR-positive group had more hepatitis B surface antigen (HBs-Ag) (p = 0.0230), higher α-fetoprotein (AFP) levels (p = 0.0023), higher des-gamma-carboxyprothrombin (DCP) levels (p = 0.0327), a larger tumor size (p = 0.0090), greater proportions of Barcelona Clinic Liver Cancer (BCLC) stage B or C (p = 0.0005), poor differentiation (p < 0.0001), and microscopic intrahepatic metastasis (p = 0.0066). In the multivariate analyses, TFR expression was an independent prognostic factor in disease-free survival (p = 0.0315). In vitro, TFRC knockdown decreased cell motility. In addition, TFRC knockdown abolished artesunate (AS)-, lenvatinib-, and sorafenib-induced ferroptosis in HCC cell lines. The study demonstrated that simultaneous treatment of AS with multi-kinase inhibitor augmented the ferroptosis-inducing effects of AS in HCC cell lines.
Conclusion
TFR expression is a poor prognostic factor in HCC, but its expression increases sensitivity to ferroptosis-inducing agents.
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Acknowledgements
This study was supported by JSPS KAKENHI (Grant No. JP-19K09198) and by the Takeda Science Foundation. The funding sources had no role in the collection, analysis, or interpretation of the data or in the decision to submit the article for publication. We thank Ms. Saori Tsurumaru, Ms. Asuka Nakamura, Ms. Yuko Kubota, and Ms. Miki Nakashima for technical support. We also thank H. Nikki March, PhD, from Edanz (https://jp.edanz.com/ac) for editing a draft of this report.
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MH and KT participated in the study conception and design, analysis, and drafting of the article. SI participated in the study conception and design, and in the critical revision of the manuscript. NH and KK participated in the data acquisition, analysis, and interpretation. YO and TY participated in the analysis participated in the critical revision of the manuscript.
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All patients provided informed consent. Registry and the Registration No. of the study: This retrospective study was approved by the ethics committee of Kyushu University (approval code: 2021-467).
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10434_2023_14053_MOESM1_ESM.tiff
Fig. S1 Gene set enrichment analysis (GSEA) shows that TFRC is highly related to the cell cycle. A Normal enrichment score (NES). B Cell cycle-related enrichment plots (TIFF 33973 KB)
10434_2023_14053_MOESM2_ESM.tiff
Fig. S2 Relationship between intracellular iron levels and efficacy of ferroptosis inducers. A Intracellular iron levels in DFO-treated cells 48 h after treatment. B Intracellular iron levels in TFRC knockdown (KD) cells 48 h after gene-silencing. C Cell proliferation ability was reduced in iron-chelated cells. Data are presented as median ± range. *p < 0.05. **p < 0.001. ***p < 0.0001. DFO, deferoxamine mesylate (TIFF 33973 KB)
10434_2023_14053_MOESM3_ESM.tiff
Fig. S3 Combination treatment augments the efficacy of sorafenib (SOR) multi-kinase inhibitor. Huh7 and PLC cells were treated with artesunate (AS) (25 µmol) and/or SOR (40 µmol). Cell viability, ROS, and MDA levels were measured 72 h after cell seeding. Combination treatment with lenvatinib (LEN) and AS resulted in (A) reduced cell viability, (B) increased ROS, and (C) MDA accumulation, indicating increased sensitivity to ferroptosis compared with SOR treatment alone. Data are presented as median ± range. *p < 0.05. **p < 0.001. ***p < 0.0001. MDA, malondialdehyde (TIFF 33973 KB)
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Hiromatsu, M., Toshida, K., Itoh, S. et al. Transferrin Receptor is Associated with Sensitivity to Ferroptosis Inducers in Hepatocellular Carcinoma. Ann Surg Oncol 30, 8675–8689 (2023). https://doi.org/10.1245/s10434-023-14053-7
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DOI: https://doi.org/10.1245/s10434-023-14053-7