Abstract
Esketamine (ESK) is the S-enantiomer of ketamine racemate (a new psychoactive substance) that can result in illusions, and alter hearing, vision, and proprioception in human and mouse. Up to now, the neurotoxicity caused by ESK at environmental level in fish is still unclear. This work studied the effects of ESK on behaviors and transcriptions of genes in dopamine and GABA pathways in zebrafish larvae at ranging from 12.4 ng L− 1 to 11141.1 ng L− 1 for 7 days post fertilization (dpf). The results showed that ESK at 12.4 ng L− 1 significantly reduced the touch response of the larvae at 48 hpf. ESK at 12.4 ng L− 1 also reduced the time and distance of larvae swimming at the outer zone during light period, which implied that ESK might potentially decrease the anxiety level of larvae. In addition, ESK increased the transcription of th, ddc, drd1a, drd3 and drd4a in dopamine pathway. Similarly, ESK raised the transcription of slc6a1b, slc6a13 and slc12a2 in GABA pathway. This study suggested that ESK could affect the heart rate and behaviors accompanying with transcriptional alterations of genes in DA and GABA pathways at early-staged zebrafish, which resulted in neurotoxicity in zebrafish larvae.
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Acknowledgements
The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (U22A20604, 42277268). This study is also financially funded by the Research Fund Program of Guangdong Provincial Key Laboratory of Psychoactive Substances Monitoring and Safety (2020B21201007).
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Li, SY., Shi, WJ., Ma, DD. et al. Effects of New Psychoactive Substance Esketamine on Behaviors and Transcription of Genes in Dopamine and GABA Pathways in Zebrafish Larvae. Bull Environ Contam Toxicol 112, 51 (2024). https://doi.org/10.1007/s00128-024-03883-0
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DOI: https://doi.org/10.1007/s00128-024-03883-0