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Deferasirox, a trivalent iron chelator, ameliorates neuronal damage in hemorrhagic stroke models

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Abstract

Purpose

Intracranial hemorrhage (ICH) is a devastating disease with high mortality and morbidity. After ICH, iron released from the hematoma plays a crucial role in secondary brain injury. Deferasirox (DFR) is a trivalent iron chelator, which was approved to treat iron overload syndrome after transfusion. The aim of the present study was to investigate the protective effects of DFR in both in vitro and in vivo ICH models.

Methods

Using a hemin-induced SH-SY5Y cell damage model, we performed an intracellular bivalent iron (Fe2+) accumulation assay, cell death assay, oxidative stress assessments, and Western blotting analysis. Moreover, the effects of DFR intraventricular administration on hematoma, neurological deficits, and histological alteration were evaluated in an in vivo ICH mouse model by collagenase.

Results

DFR significantly suppressed the intracellular Fe2+ accumulation and cell death caused by hemin exposure. These effects were related to the suppression of both reactive oxygen species and lipid peroxidation over-production. In Western blotting analysis, hemin increased the expression of ferritin (an iron storage protein), LC3 and p62 (autophagy-related markers), phosphorylated p38 (a stress response protein), and cleaved-caspase3 and cleaved-poly (adenosine diphosphate ribose) polymerase (PARP) (apoptosis-related makers). However, DFR suppressed the increase of these proteins. In addition, DFR attenuated the neurological deficits until 7 days after ICH without affecting hematoma and injury area. Furthermore, DFR also suppressed microglia/macrophage activation in peri-hematoma area at 3 days after ICH.

Conclusion

These findings indicate that DFR might be a useful therapeutic agent for the therapy of ICH.

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Acknowledgments

The authors would like thanks to Professor Hideko Nagasawa and Dr. Tasuku Hirayama (Pharmaceutical and Medicinal Chemistry, Gifu Pharmaceutical University) for providing Si-RhoNox-1, a specific fluorescence probe to detect Fe2+.

Funding

This study was no supported.

Author information

Authors and Affiliations

Authors

Contributions

TI carried out most of the experiments and wrote the paper. HM and TS assisted in the establishment of the ICH mice model. ST performed the behavioral experiments. HM supported the cell counting assessment in immunostaining analysis. TI, SN, MS, and HH designed all the experiments and performed the data analysis. SN, MS, and HH gave advice and supervised the experimental works and helped to draft the manuscript. All authors discussed the results and implications and commented on the manuscript at all stages. All data were generated in-house and that no paper mill was used.

Corresponding author

Correspondence to Masamitsu Shimazawa.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All animal experiments performed in this study were approved by the animal experiment committees of Gifu Pharmaceutical University.

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Imai, T., Tsuji, S., Matsubara, H. et al. Deferasirox, a trivalent iron chelator, ameliorates neuronal damage in hemorrhagic stroke models. Naunyn-Schmiedeberg's Arch Pharmacol 394, 73–84 (2021). https://doi.org/10.1007/s00210-020-01963-6

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  • DOI: https://doi.org/10.1007/s00210-020-01963-6

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