Neurotoxic Effects of Organophosphate Compounds on Seizure Mechanisms

Organophosphate compounds, widely used as pesticides and encountered as nerve agents, exert neurotoxicity principally through irreversible inhibition of acetylcholinesterase in the central nervous system. This inhibition leads to excessive accumulation of acetylcholine at synapses, precipitating cholinergic overstimulation and rapid onset of seizures. Uncontrolled convulsive activity often progresses to status epilepticus, during which excitotoxic cascades, oxidative stress and neuroinflammatory responses amplify neuronal injury. Reactive gliosis and blood–brain barrier dysfunction further perpetuate hyperexcitability, fostering epileptogenesis and long-term cognitive deficits. Understanding the interplay between acute cholinergic crisis, secondary inflammatory mediators and synaptic reorganisation is essential for the development of targeted interventions to prevent both immediate mortality and delayed neurological sequelae in exposed populations.

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Neurotoxic Effects of Organophosphate Compounds on Seizure Mechanisms publication trend

The graph below shows the total number of articles in neurotoxic effects of organophosphate compounds on seizure mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Acetylcholinesterase: Enzyme responsible for hydrolysis of the neurotransmitter acetylcholine, whose inhibition leads to cholinergic overstimulation.

Status epilepticus: A continuous seizure lasting more than five minutes or recurrent seizures without full recovery of consciousness, representing a neurological emergency.

Reactive gliosis: Proliferation and activation of astrocytes and microglia in response to neural injury, contributing to inflammatory signalling and altered synaptic function.

Inducible nitric oxide synthase (iNOS): An enzyme upregulated in glial cells that produces nitric oxide, mediating oxidative stress and inflammatory damage during seizures.

Blood–brain barrier: A selective endothelial interface that regulates molecular and cellular traffic between the circulation and the brain parenchyma; its disruption facilitates neurotoxic infiltration.

References

1. Brain-targeted nanoreactors prevent the development of organophosphate-induced delayed neurological damage. Journal of Nanobiotechnology (2023).
2. Disease-modifying effects of a glial-targeted inducible nitric oxide synthase inhibitor (1400W) in mixed-sex cohorts of a rat soman (GD) model of epilepsy. Journal of Neuroinflammation (2023).
3. Persistent neuroinflammation and cognitive impairment in a rat model of acute diisopropylfluorophosphate intoxication. Journal of Neuroinflammation (2016).