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Developmental exposure to acetaminophen does not induce hyperactivity in zebrafish larvae

  • Psychiatry and Preclinical Psychiatric Studies - Original Article
  • Published:
Journal of Neural Transmission Aims and scope Submit manuscript

Abstract

First line pain relief medication during pregnancy relies nearly entirely on the over-the-counter analgesic acetaminophen, which is generally considered safe to use during gestation. However, recent epidemiological studies suggest a risk of developing attention-deficit/hyperactivity disorder (ADHD)-like symptoms in children if mothers use acetaminophen during pregnancy. Currently, there are no experimental proofs that prenatal acetaminophen exposure causes developmental brain alterations of progeny. Exposure to high acetaminophen concentrations causes liver toxicity, which is well investigated in different model organisms. However, sub-liver-toxic concentrations have not been experimentally investigated with respect to ADHD endophenotypes such as hyperactivity. We used zebrafish to investigate the potential impact of acetaminophen exposure on locomotor activity levels, and compared it to the established zebrafish Latrophilin 3 (Lphn3) ADHD-model. We determined the sub-liver-toxic concentration of acetaminophen in zebrafish larvae and treated wild-type and lphn3.1 knockdown larvae with increasing concentrations of acetaminophen. We were able to confirm that lphn3.1 knockdown alone causes hyperactivity, strengthening the implication of Lphn3 dysfunction as an ADHD risk factor. Neither acute nor chronic exposure to acetaminophen at sub-liver-toxic concentrations in wild-type or lphn3.1 knock-downs increases locomotor activity levels. Together our findings show that embryonic to larval exposure to acetaminophen does not cause hyperactivity in zebrafish larvae. Furthermore, there are no additive and/or synergistic effects of acetaminophen exposure in a susceptible background induced by knock-down of lphn3.1. Our experimental study suggests that there is, at least in zebrafish larvae, no direct link between embryonic acetaminophen exposure and hyperactivity. Further work is necessary to clarify this issue in humans.

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Acknowledgments

We are grateful to M. Schartl for generously providing access to the fish facility and lab infrastructure, and to E Klopocki for qPCR support. Furthermore, we are thankful to W. Norton and M. Lange for advises regarding the lphn3.1 morphant behavior phenotype, Y. Kikuchi for generously sharing in situ probes, and C. Stigloher and W. Norton for critical comments on the manuscript. CL is funded by the Program Chancengleichheit für Frauen in Forschung und Lehre from the Bayerische Staatsregierung and University of Würzburg, and by a grant of the German Excellence Initiative to the Graduate School of Life Sciences, University of Würzburg.

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Correspondence to Carsten Drepper or Christina Lillesaar.

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The authors declare that they have no conflict of interest.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

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C. Drepper and C. Lillesaar both share last authorship.

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702_2016_1556_MOESM1_ESM.jpg

Supplementary material 1. Injection of lphn3.1 splice morpholino causes loss of lphn3.1 transcripts. Reverse transcription followed by nested PCR performed on total RNA extracted from a pool of uninjected controls, lphn3.1 morphants or mismatch controls at 48 hpf. Arrow indicates wild-type lphn3.1 PCR-product (748 bp) (JPEG 114 kB)

702_2016_1556_MOESM2_ESM.jpg

Supplementary material 2. Morpholino knock-down of lphn3.1 increases locomotor activity in 6 dpf zebrafish larvae. Analysis of total distance swum (A), duration (B), swim speed (C) and number of entries into (D) inactivity, slow or fast swimming during a 5 minutes interval in uninjected controls, mismatch controls or lphn3.1 morphants. Numbers on bars in A indicate numbers of analyzed individuals and are the same for A-D.Bars and error bars illustrate mean+SD. * p<0.05 (JPEG 383 kb)

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Reuter, I., Knaup, S., Romanos, M. et al. Developmental exposure to acetaminophen does not induce hyperactivity in zebrafish larvae. J Neural Transm 123, 841–848 (2016). https://doi.org/10.1007/s00702-016-1556-z

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  • DOI: https://doi.org/10.1007/s00702-016-1556-z

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