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Nerve agent exposure elicits site-specific changes in protein phosphorylation in mouse brain
Hongwen Zhu1, Jennifer J O'Brien, James P O'Callaghan
1Department of Molecular Neuropharmacology, Intra-Cellular Therapies, Inc. (ITI), Audubon Business and Technology Center, 3960 Broadway, New York, NY 10032, USA.
Brain Research
|April 29, 2010
Summary
Organophosphorus compounds cause severe toxicity by inhibiting acetylcholinesterase (AChE). This study reveals region-specific brain signaling changes after OP exposure, identifying potential targets for new anti-convulsant therapies.
Area of Science:
- Neuroscience
- Toxicology
- Biochemistry
Background:
- Organophosphorus (OP) compounds irreversibly inhibit acetylcholinesterase (AChE), leading to severe neurotoxicity, including seizures, coma, and death.
- Understanding the central nervous system (CNS) pathways affected by OP intoxication is crucial for developing effective treatments against acute toxicity and long-term cognitive deficits.
Purpose of the Study:
- To investigate the changes in neuronal phosphoprotein phosphorylation in response to OP exposure using the CNSProfile method.
- To identify specific CNS pathways and molecular targets affected by OP compounds, such as diisopropyl fluorophosphate (DFP).
Main Methods:
- Focused microwave fixation was used to preserve the phosphorylation state of phosphoproteins in the brains of DFP-treated mice.
- Hippocampus and striatum tissues were analyzed by immunoblotting with phospho-specific antibodies to detect changes in protein phosphorylation.
- The effects of phencynonate hydrochloride, a muscarinic cholinergic antagonist, on DFP-induced behaviors and phosphorylation changes were evaluated.
Main Results:
- DFP exposure altered the phosphorylation of key neuronal proteins, including NR1 NMDA receptors and DARPP-32, in a region-specific manner (striatum vs. hippocampus).
- NR1 phosphorylation was decreased in the striatum but increased in the hippocampus following DFP treatment.
- DARPP-32 phosphorylation at Threonine75 (T75), a Cdk5 kinase substrate, was selectively increased in the striatum.
- Phencynonate hydrochloride administration prevented DFP-induced seizure-like behaviors and normalized the observed phosphorylation changes.
Conclusions:
- OP nerve agent exposure induces region-specific alterations in intracellular signaling pathways within the brain.
- These signaling changes correlate with seizure-like behavior and are reversible with muscarinic receptor blockade.
- The study identifies specific targets, including Cdk5 kinase substrates, that may serve as a basis for novel anti-convulsant therapies against OP intoxication.
