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Organophosphorus diisopropylfluorophosphate (DFP) intoxication in zebrafish larvae causes behavioral defects, neuronal hyperexcitation and neuronal death

Abstract : With millions of intoxications each year and over 200,000 deaths, organophosphorus (OP) compounds are an important public health issue worldwide. OP poisoning induces cholinergic syndrome, with respiratory distress, hypertension, and neuron damage that may lead to epileptic seizures and permanent cognitive deficits. Existing countermeasures are lifesaving but do not prevent longlasting neuronal comorbidities, emphasizing the urgent need for animal models to better understand OP neurotoxicity and identify novel antidotes. Here, using diisopropylfluorophosphate (DFP), a prototypic and moderately toxic OP, combined with zebrafish larvae, we first showed that DFP poisoning caused major acetylcholinesterase inhibition, resulting in paralysis and CNS neuron hyperactivation, as indicated by increased neuronal calcium transients and overexpression of the immediate early genes fosab, junBa, npas4b, and atf3. In addition to these epileptiform seizurelike events, DFP-exposed larvae showed increased neuronal apoptosis, which were both partially alleviated by diazepam treatment, suggesting a causal link between neuronal hyperexcitation and cell death. Last, DFP poisoning induced an altered balance of glutamatergic/GABAergic synaptic activity with increased NR2B-NMDA receptor accumulation combined with decreased GAD65/67 and gephyrin protein accumulation. The zebrafish DFP model presented here thus provides important novel insights into the pathophysiology of OP intoxication, making it a promising model to identify novel antidotes.
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https://www.hal.inserm.fr/inserm-03058521
Contributor : Nadia Nadia Soussi-Yanicostas Connect in order to contact the contributor
Submitted on : Friday, December 11, 2020 - 6:35:29 PM
Last modification on : Tuesday, September 28, 2021 - 5:16:41 PM
Long-term archiving on: : Friday, March 12, 2021 - 8:21:56 PM

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Alexandre Brenet, Julie Somkhit, Rahma Hassan-Abdi, Constantin Yanicostas, Christiane Romain, et al.. Organophosphorus diisopropylfluorophosphate (DFP) intoxication in zebrafish larvae causes behavioral defects, neuronal hyperexcitation and neuronal death. Scientific Reports, Nature Publishing Group, 2020, 10 (1), pp.19228. ⟨10.1038/s41598-020-76056-8⟩. ⟨inserm-03058521⟩

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