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Signal Attenuation as a Rat Model of Obsessive Compulsive Disorder

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White matter abnormalities in pediatric obsessive-compulsive disorder.

Timothy Silk¹, Jian Chen, Marc Seal

¹Developmental Imaging, Murdoch Childrens Research Institute, Royal Children's Hospital, Melbourne 3052, Australia. tim.silk@mcri.edu.au

Psychiatry Research

|June 11, 2013

Summary

Diffusion tensor imaging (DTI) reveals altered white matter in children with obsessive-compulsive disorder (OCD). Lower axial diffusivity in the corpus callosum correlated with increased symptom severity in pediatric OCD patients.

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Area of Science:

Neuroimaging
Developmental Neuroscience
Psychiatry

Background:

Obsessive-compulsive disorder (OCD) is a debilitating psychiatric condition with significant impact on children and adolescents.
The underlying neurobiological mechanisms and structural brain alterations in pediatric OCD remain incompletely understood.
Diffusion tensor imaging (DTI) offers a non-invasive method to investigate white matter microstructure integrity.

Purpose of the Study:

To investigate white matter microstructure differences in children with OCD compared to typically developing controls using DTI.
To explore the relationship between white matter integrity and symptom severity in pediatric OCD.

Main Methods:

Diffusion-weighted magnetic resonance imaging (DTI) was conducted on 16 children with OCD and 22 typically developing children.
Tract-based spatial statistics (TBSS) was employed to analyze and compare white matter tract microstructure between groups.
Correlation and regression analyses examined the association between diffusion measures and OCD symptom severity (CBCL-OCS).

Main Results:

Children with OCD exhibited significantly lower axial diffusivity in the genu and splenium of the corpus callosum compared to controls.
Lower axial diffusivity in these regions was correlated with greater symptom severity in the OCD group.
These findings suggest specific white matter alterations in pediatric OCD.

Conclusions:

DTI reveals significant white matter abnormalities in the corpus callosum of children with OCD.
Axial diffusivity in these tracts is associated with OCD symptom severity, highlighting a potential imaging biomarker.
These findings contribute to understanding the neurobiology of pediatric OCD and may inform future therapeutic strategies.