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Updated: Jul 12, 2025

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Long-Term Neuropsychiatric Developmental Defects after Neonatal Organophosphate Exposure: Mitigation by Synthetic

Michael James Neff1, Doodipala Samba Reddy2

  • 1Department of Neuroscience and Experimental Therapeutics (M.J.N., D.S.R.) and Institute of Pharmacology and Neurotherapeutics (M.J.N., D.S.R.), School of Medicine, Texas A&M University Health Science Center, Bryan, Texas.

The Journal of Pharmacology and Experimental Therapeutics
|October 20, 2023
PubMed

Insights

Pediatric organophosphate (OP) pesticide exposure causes long-term neurodevelopmental deficits in rats. Neurosteroid ganaxolone treatment significantly protected against these behavioral and cognitive impairments, suggesting a potential therapy for children.

Area of Science:

  • Neuroscience
  • Toxicology
  • Developmental Biology

Background:

  • Children are highly susceptible to neurotoxic effects of organophosphate (OP) pesticides and nerve agents.
  • OP poisoning in children can lead to acute seizures and long-term neuropsychiatric disabilities and cognitive impairments.
  • Limited chronic rodent models exist for studying pediatric OP exposure's neurodevelopmental consequences and interventions.

Purpose of the Study:

  • To investigate the protective effect of the neurosteroid ganaxolone (GX) against long-term neurodevelopmental impacts of neonatal organophosphate exposure.
  • To establish a pediatric rodent model for studying chronic effects of OP exposure and potential therapeutic interventions.

Main Methods:

  • Neonatal rats (postnatal day 28) were acutely exposed to the organophosphate diisopropyl-fluorophosphate (DFP).
  • Animals were evaluated for cognitive and behavioral deficits at 3 and 10 months post-exposure, with or without ganaxolone (GX) treatment.
  • Neuropathological analysis, including neuronal counts, neuroinflammation markers, and neurogenesis, was performed at 10 months.

Main Results:

  • DFP exposure induced significant long-term deficits in mood, anxiety, depression, aggression, learning, and memory in pediatric rats.
  • DFP-induced neuropathology included neuronal loss, reduced neurogenesis, increased astrogliosis, neuroinflammation, and mossy fiber sprouting.
  • Ganaxolone (GX) treatment significantly ameliorated behavioral and cognitive deficits and protected against neuroinflammation and neurodegeneration.

Conclusions:

  • This pediatric model effectively replicates the neurodevelopmental consequences of OP exposure observed in children.
  • Neurosteroid intervention with ganaxolone (GX) shows significant protective effects against long-term neurobehavioral and neuropathological deficits.
  • This study supports ganaxolone as a potential therapeutic strategy for mitigating the long-term effects of acute OP exposure in children.

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