Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 157, Issue -, Pages 335-346Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2017.05.078
Keywords
Graphene oxide; Nanotoxicology; Neurotoxicology; Autophagosome; Zebrafish larvae
Funding
- FINEP Research Grant Implantacao, Modernizacao e Qualificacao de Estrutura de Pesquisa da PUCRS (PUCRS-INFRA) [01.11.0014-00]
- INCT - Brain Disease Excitotoxicity and Neuroprotection
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
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Although graphene oxide (GO), a nanomaterial with hexagonal planar layer, has been widely studied due to its applications in neurobiology that include drug delivery and tissue engineering, additional studies to assess its potential toxic effects are still needed. Thus, this study evaluated the effects of GO exposure (at 5, 10, 50 or 100 mg/L) during six consecutive days on mortality, hatching, spontaneous movement, heart rate, morphology, locomotion behavior, acetylcholinesterase (AChE) activity, dopamine levels and relative gene expression of developmental neurology-related genes using zebrafish larvae. In the 5 mg/L dose, synapsin Ha expression up-regulation was seen concomitantly with down-regulation of dat expression, showing a potential compensatory mechanism. Moreover, the 10 mg/L exposure caused an increase in heart rate, in absolute turn angle, brain cell damage and a decrease in dopamine levels. These alterations may be associated with autophagosome formation found in GO-exposed larval brain. No changes were observed on higher doses of GO exposure, probably due to nanomaterial agglomeration. Taken together, these results show that toxic effects of GO exposure are not dose-dependent, and are preeminent in lower concentrations. Additional studies are needed to deepen the specific mechanisms of GO neurotoxicity and are required to elucidate its potential biomedical use. (C) 2017 Elsevier B.V. All rights reserved.
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