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Published on: October 17, 2025
Modeling early cortical serotonergic deficits in autism.
Carolyn B Boylan1, Mary E Blue, Christine F Hohmann
1Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
Behavioural Brain Research
|October 13, 2006
Summary
This study created a mouse model of autism by depleting serotonin (5-HT) in newborns. The model showed brain structure changes and autism-like behaviors, suggesting 5-HT
Area of Science:
- Neuroscience
- Developmental Biology
- Behavioral Science
Background:
- Autism Spectrum Disorder (ASD) is a neurodevelopmental condition marked by social, language, and behavioral deficits.
- Brain imaging in children with autism reveals enlarged cerebral cortical volumes and neuroanatomic alterations.
- Forebrain serotonergic (5-HT) system dysfunction is implicated in the neurobiology and behavioral characteristics of autism.
Purpose of the Study:
- To develop and characterize a novel animal model of autism using selective serotonin depletion in neonatal mice.
- To investigate the neurochemical, structural, and behavioral consequences of early-life forebrain 5-HT deficiency.
Main Methods:
- Neonatal mice underwent bilateral medial forebrain bundle injections of the neurotoxin 5,7-dihydroxytryptamine (5,7-DHT) to deplete forebrain 5-HT.
- Adult behavioral assessments evaluated social interaction, sensory processing, and stereotypic behaviors.
- Neuroanatomic analysis included cortical width measurements, 5-HT immunocytochemistry, and autoradiographic binding assays for 5-HT transporters and AMPA glutamate receptors.
Main Results:
- 5,7-DHT-treated mice exhibited significant long-lasting depletion of forebrain 5-HT fibers in the cerebral cortex.
- Lesioned mice displayed altered social, sensory, and stereotypic behaviors, consistent with an autism phenotype.
- Increased cortical width was observed, alongside transient reductions in 5-HT transporter binding and decreased AMPA glutamate receptor binding at specific developmental time points.
Conclusions:
- Selective forebrain serotonin depletion in neonatal mice provides a valid model for studying autism's neurobiology and behavior.
- The findings suggest that early-life serotonergic deficits may contribute to cortical volume increases and behavioral abnormalities seen in autism.
- Hypothesized mechanism involves impaired axonal pruning to the cerebral cortex due to 5-HT deficiencies, impacting sensorimotor and cognitive functions.
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