Abstract
Purpose
We investigated the possible neuroprotective effects of the free radical scavenger edaravone in experimental hydrocephalus.
Methods
Seven-day-old Wistar rats were divided into three groups: control group (C), untreated hydrocephalic (H), and hydrocephalic treated with edaravone (EH). The H and EH groups were subjected to hydrocephalus induction by 20% kaolin intracisternal injection. The edaravone (20 mg/kg) was administered daily for 14 days from the induction of hydrocephalus. All animals were daily weighed and submitted to behavioral test and assessment by magnetic resonance imaging. After 14 days, the animals were sacrificed and the brain was removed for histological, immunohistochemical, and biochemical studies.
Results
The gain weight was similar between groups from the ninth post-induction day. The open field test performance of EH group was better (p < 0.05) as compared to untreated hydrocephalic animals. Hydrocephalic animals (H and EH) showed ventricular ratio values were higher (p < 0.05), whereas magnetization transfer values were lower (p < 0.05), as compared to control animals. Astrocyte activity (glial fibrillary acidic protein) and apoptotic cells (caspase-3) of EH group were decreased on the corpus callosum (p > 0.01), germinal matrix (p > 0.05), and cerebral cortex (p > 0.05), as compared to H group.
Conclusions
We have demonstrated that administration of edaravone for 14 consecutive days after induction of hydrocephalus reduced astrocyte activity and that it has some beneficial effects over apoptotic cell death.
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Acknowledgements
This work was funded by a grant and regulates assistance from FAPESP—Foundation of São Paulo Research. Camila A B Garcia was a recipient of FAPESP scholarship (grant number 2013/04130-6). The authors are grateful to Antonio Renato Meirelles e Silva for his assistance with the microscope photographs and to Prof Dr. João Pereira Leite for his assistance with the immunofluorescence analysis (Department of Neuroscience and Behavioral Sciences, Faculty of Medicine of Ribeirão Preto, University of São Paulo).
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This study was designed according to the ethical guidelines published by the Brazilian College of Animal Experimentation (COBEA), protocol number 114/2012, and was approved by the Ethics Committee of Animal Experimentation of Ribeirao Preto Medical School, University of Sao Paulo (CETEA/FMRP-USP).
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The authors declare that there is no conflict of interest that could be perceived as prejudicing the impartiality of the reported research.
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Garcia, C.A.B., Catalão, C.H.R., Machado, H.R. et al. Edaravone reduces astrogliosis and apoptosis in young rats with kaolin-induced hydrocephalus. Childs Nerv Syst 33, 419–428 (2017). https://doi.org/10.1007/s00381-016-3313-x
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DOI: https://doi.org/10.1007/s00381-016-3313-x