Medial temporal lobe abnormalities in pediatric unipolar depression

Sheila C. Caetano, Manoela Fonseca, John P Hatch, Rene L. Olvera, Mark Nicoletti, Kristina Hunter, Beny Lafer, Steven R. Pliszka, Jair C. Soares

Producción científica: Articlerevisión exhaustiva

71 Citas (Scopus)

Resumen

In vivo anatomical magnetic resonance imaging (MRI) studies in adults with major depressive disorder (MDD) have implicated neurocircuitries involved in mood regulation in the pathophysiology of mood disorders. Specifically, abnormalities in the medial temporal lobe structures have been reported. This study examined a sample of children and adolescents with major depressive disorder to investigate anatomical abnormalities in these key medial temporal brain regions. Nineteen children and adolescents with DSM-IV major depression (mean age ± S.D. = 13.0 ± 2.4 years; 10 unmedicated) and 24 healthy comparison subjects (mean age ± S.D. = 13.9 ± 2.9 years) were studied using a 1.5 T Philips MRI scanner. We measured hippocampus and amygdala gray matter volumes. MRI structural volumes were compared using analysis of covariance with age and total brain volumes as covariates. Pediatric depressed patients had significantly smaller left hippocampal gray matter volumes compared to healthy controls (1.89 ± 0.16 cm3 versus 1.99 ± 0.18 cm3, respectively; F = 5.0, d.f. = 1/39, p = 0.03; effect size: ηp2 = 0.11). Unmedicated depressed patients showed a trend towards smaller left hippocampal volumes compared to medicated patients and healthy subjects (F = 2.8, d.f. = 2/38, p = 0.07; effect size: ηp2 = 0.13). There were no statistically significant differences in mean volumes for left or right amygdala. Smaller left hippocampal volumes in children and adolescents with MDD are in agreement with findings from adult studies and suggest that such abnormalities are present early in the course of the illness. Amygdala volumes are not abnormal in this age group. Smaller hippocampal volumes may be related to an abnormal developmental process or HPA axis dysfunction.

Idioma originalEnglish (US)
Páginas (desde-hasta)142-147
Número de páginas6
PublicaciónNeuroscience Letters
Volumen427
N.º3
DOI
EstadoPublished - nov 19 2007

ASJC Scopus subject areas

  • General Neuroscience

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