Abstract
Oxidative stress is a key factor in the pathogenesis of several neurodegenerative disorders and is involved in the accumulation of amyloid beta plaques and Tau inclusions. Edaravone (EDR) is a free radical scavenger that is approved for motor neuron disease and acute ischemic stroke. EDR alleviates pathologies and cognitive impairment of AD via targeting multiple key pathways in transgenic mice. Herein, we aimed to study the effect of EDR on Tau pathology in P301L mice; an animal model of frontotemporal dementia (FTD), at two age time points representing the early and late stages of the disease. A novel EDR formulation was utilized in the study and the drug was delivered orally in drinking water for 3 months. Then, behavioral tests were conducted followed by animal sacrifice and brain dissection. Treatment with EDR improved the reference memory and accuracy in the probe trial as evaluated in Morris water maze, as well as novel object recognition and significantly alleviated motor deficits in these mice. EDR also reduced the levels of 4-hydroxy-2-nonenal and 3-nitrotyrosine adducts. In addition, immunohistochemistry showed that EDR reduced tau phosphorylation and neuroinflammation and partially rescued neurons against oxidative neurotoxicity. Moreover, EDR attenuated downstream pathologies involved in Tau hyperphosphorylation. These results suggest that EDR may be a potential therapeutic agent for the treatment of FTD.
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Acknowledgements
The authors acknowledge the support provided to S. Kelliny by Commonwealth Research and Training scholarship and Egyptian Ministry of Higher Education. We would like to thank Mr. Andrew Beck for suggestions regarding histological techniques and imaging. The authors would also like to acknowledge H Md Morshed Alam (BASF Australia Ltd) for providing samples of Soluplus, and Suzhou Auzone Biotech for the Edaravone formulation.
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This study was supported by National Health and Medical Research Council (NHMRC) Grants (1020567, 1021409) and supporting Grant from the University of South Australia.
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LB and XFZ contributed to the study conception and design. Material preparation, experiments, data collection and analysis were performed by SK. JX collaborated in animal studies. The first draft of the manuscript was written by SK and all authors commented on previous versions of the manuscript. LB and XFZ supervised the study. All the authors reviewed and approved the final version of the manuscript submitted.
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XFZ is one of the inventors of Chinese patent 200610149832.9. The authors report no other conflicts of interest in this work.
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All procedures were compliant with the approved protocol (U17-14, U13-18) from Animal Ethics Committee of the University of South Australia and the South Australia animal welfare act and the “Australian code of practice and use of animals for scientific purposes”.
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Kelliny, S., Xiong, J., Bobrovskaya, L. et al. Preclinical validation of a novel oral Edaravone formulation for treatment of frontotemporal dementia. Neurotox Res 39, 1689–1707 (2021). https://doi.org/10.1007/s12640-021-00405-2
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DOI: https://doi.org/10.1007/s12640-021-00405-2