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Preserved white matter in unmedicated pediatric bipolar disorder
Ana Maria A Teixeira1, Ana Kleinman2, Marcus Zanetti3
1Bipolar Research Program, Department of Psychiatry, University of São Paulo School of Medicine, São Paulo, Brazil; Laboratory of Psychiatric Neuroimaging, Department of Psychiatry, University of São Paulo School of Medicine, São Paulo, Brazil; Center for the Support of Research in Applied Neuroscience, University of São Paulo, São Paulo, Brazil.
Insights
This study found no white matter (WM) microstructural differences in pediatric bipolar disorder (BD) patients or their healthy offspring compared to controls. These findings suggest WM alterations may not be an early vulnerability marker in this specific pediatric population.
Area of Science:
- Neuroscience
- Psychiatry
- Developmental Psychology
Background:
- White matter (WM) abnormalities are reported in bipolar disorder (BD) and relatives, suggesting a potential vulnerability marker.
- Previous research often involved older subjects, medicated patients, or offspring with other psychiatric diagnoses.
Purpose of the Study:
- To investigate WM microstructure in pediatric, unmedicated BD patients and healthy offspring of BD parents.
- To determine if WM alterations are present in early stages of BD development.
Main Methods:
- Utilized 3T Diffusion Tensor Magnetic Resonance Imaging (DT-MRI) on 18 pediatric BD patients, 18 healthy offspring, and 20 healthy controls.
- Employed tract-based spatial statistics to analyze fractional anisotropy and diffusivity measures of WM microstructure.
Main Results:
- No significant differences in WM microstructure were found between the pediatric BD patients, healthy offspring, and healthy control groups.
- This contrasts with findings in older populations or those with different clinical profiles.
Conclusions:
- WM microstructure differences may not be an early indicator of vulnerability for bipolar disorder in pediatric, unmedicated populations.
- Understanding disease ontogeny and brain development is crucial for identifying early vulnerability markers.
Abstract:
White matter (WM) abnormalities have been reported in bipolar disorder (BD) patients, as well as in their non-BD relatives, both children and adults. Although it is considered an emerging vulnerability marker for BD, there are no studies investigating WM alterations in pediatric unmedicated patients and young healthy offspring. In this study, we evaluated the presence of WM alterations in 18 pediatric, non medicated BD patients, as well as in 18 healthy offspring of BD type I parents and 20 healthy controls. 3T DT-MRI data were acquired and scans were processed with tract-based spatial statistics to provide measures of fractional anisotropy and diffusivity. We found no significant differences in WM microstructure between BD patients, healthy offspring and healthy controls. Previous studies that reported WM alterations investigated older subjects, either on medication (BD patients) or with psychiatric diagnoses other than BD (unaffected offspring). Our findings highlight the importance of the understanding of disease ontogeny and brain development dynamics in the search for early vulnerability markers for psychiatric disorders.
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