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Methods for Studying the Mechanisms of Action of Antipsychotic Drugs in Caenorhabditis elegans
Published on: February 4, 2014
Antipsychotic drugs alter neuronal development including ALM neuroblast migration and PLM axonal outgrowth in
Dallas R Donohoe1, Kathrine Weeks, Eric J Aamodt
1Department of Pharmacology, Toxicology and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA.
Insights
Antipsychotic medications may disrupt neurodevelopment. This study found that several antipsychotics impaired neuronal migration and axonal outgrowth in a model organism, highlighting potential risks in developing nervous systems.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Antipsychotic drugs are increasingly prescribed for vulnerable populations, including children, adolescents, and pregnant women.
- Existing research lacks detailed understanding of antipsychotic effects on neuronal development and mechanisms of action.
- Previous studies in rats indicated global neurodevelopmental effects, such as reduced brain size.
Purpose of the Study:
- To investigate the impact of various antipsychotic drugs on neuronal development using a model organism.
- To examine specific effects on neuronal migration and axonal outgrowth.
- To explore potential mechanisms underlying these neurodevelopmental deficits.
Main Methods:
- Utilized Caenorhabditis elegans as a model organism for studying neuronal development.
- Examined effects on mechanosensory neuron migration and axonal outgrowth using green fluorescent protein reporters.
- Tested multiple antipsychotic drugs, including clozapine, fluphenazine, haloperidol, risperidone, aripiprazole, quetiapine, trifluoperazine, and olanzapine.
- Investigated rescue effects using serotonin and a dopaminergic agonist (quinpirole).
Main Results:
- Clozapine, fluphenazine, and haloperidol significantly impaired ALM neuron migration and PLM neuron axonal outgrowth.
- Observed defects included neuroblast migration failure and excessive axonal growth with abnormal morphology.
- Other tested antipsychotics showed modest but detectable neurodevelopmental effects.
- Neurodevelopmental deficits were not rescued by co-incubation with serotonin or quinpirole.
Conclusions:
- This study provides the first evidence that antipsychotic drugs interfere with neuronal migration and axonal outgrowth in a developing nervous system.
- The findings suggest potential risks associated with antipsychotic exposure during critical neurodevelopmental periods.
- Further research is warranted to elucidate the precise mechanisms and long-term consequences of these observed neurodevelopmental effects.
Abstract:
Antipsychotic drugs are increasingly being prescribed for children and adolescents, and are used in pregnant women without a clear demonstration of safety in these populations. Global effects of these drugs on neurodevelopment (e.g., decreased brain size) have been reported in rats, but detailed knowledge about neuronal effects and mechanisms of action are lacking. Here we report on the evaluation of a comprehensive panel of antipsychotic drugs in a model organism (Caenorhabditis elegans) that is widely used to study neuronal development. Specifically, we examined the effects of the drugs on neuronal migration and axonal outgrowth in mechanosensory neurons visualized with green fluorescent protein expressed from the mec-3 promoter. Clozapine, fluphenazine, and haloperidol produced deficits in the development and migration of ALM neurons and axonal outgrowth in PLM neurons. The defects included failure of neuroblasts to migrate to the proper location, and excessive growth of axons past their normal termination point, together with abnormal morphological features of the processes. Although the antipsychotic drugs are potent antagonists of dopamine and serotonin receptors, the neurodevelopmental deficits were not rescued by co-incubation with serotonin or the dopaminergic agonist, quinpirole. Other antipsychotic drugs, risperidone, aripiprazole, quetiapine, trifluoperazine and olanzapine, also produced modest, but detectable, effects on neuronal development. This is the first report that antipsychotic drugs interfere with neuronal migration and axonal outgrowth in a developing nervous system.
