Abstract
Rationale
Ketamine has been associated with pediatric risks that include neurocognitive impairment and long-term behavioral disorders. However, the neurobehavioral effects of ketamine exposure in early development remain uncertain.
Objectives
This study aimed to test stage- and dose-dependent effects of ketamine exposure on certain brain functions by evaluating alterations in locomotion, anxiety-like and avoidance behaviors, as well as socialization.
Methods
Embryos were exposed to different concentrations of ketamine (0, 0.2, 0.4, and 0.8 mg mL−1) for 20 min during the 256-cell (2.5 h post fertilization—hpf), 50% epiboly (5.5 hpf), and 1–4 somites (10.5 hpf) stages. General exploratory activities, natural escape-like responses, and social interactions were analyzed under continuous light or under a moving light stimulus.
Results
A dose-dependent decrease in the overall mean speed was perceived in the embryos exposed during the 256-cell stage. These results were related to previously observed head and eye malformations, following ketamine exposure at this stage and may indicate possible neurobehavioral disorders when ketamine exposure is performed at this stage. Results also showed that ketamine exposure during the 50% epiboly and 1–4 somites stages induced a significant increment of the anxiety-like behavior and a decrease in avoidance behavior in all exposed groups.
Conclusions
Overall, the results validate the neurodevelopmental risks of early-life exposure to ketamine.
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Acknowledgements
This work was supported by FEDER funds through the Operational Competitiveness Programme—COMPETE and by the Operational Competitiveness and Internationalization Programme—POCI and by National Funds through FCT—Fundação para a Ciência e a Tecnologia under the project FCOMP-01-0124-FEDER-028683 (PTDC/CVT-WEL/4672/2012), and POCI-01-0145-FEDER-006958 (UID/AGR/04033/2013). Financial support for Ana M. Valentim was provided by postdoctoral fellowship SFRH/BPD/103006/2014 issued by FCT.
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Félix, L.M., Antunes, L.M., Coimbra, A.M. et al. Behavioral alterations of zebrafish larvae after early embryonic exposure to ketamine. Psychopharmacology 234, 549–558 (2017). https://doi.org/10.1007/s00213-016-4491-7
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DOI: https://doi.org/10.1007/s00213-016-4491-7