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Decrease in caudate glutamatergic concentrations in pediatric obsessive-compulsive disorder patients taking

D R Rosenberg1, F P MacMaster, M S Keshavan

  • 1Department of Psychiatry, Wayne State University, Detroit, USA. drosen@med.wayne.edu

Journal of the American Academy of Child and Adolescent Psychiatry
|September 15, 2000
PubMed
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Pediatric obsessive-compulsive disorder (OCD) shows higher caudate nucleus glutamate levels. Treatment with paroxetine (a selective serotonin reuptake inhibitor) significantly reduced these levels, correlating with symptom improvement.

Area of Science:

  • Neuroscience
  • Child and Adolescent Psychiatry
  • Radiology

Background:

  • Pediatric obsessive-compulsive disorder (OCD) is a common neuropsychiatric disorder.
  • Neurochemical alterations in the brain, particularly in the basal ganglia, are implicated in OCD pathophysiology.
  • The role of glutamate in pediatric OCD remains an area of active investigation.

Purpose of the Study:

  • To investigate in vivo neurochemical changes in the caudate nucleus of children with OCD before and after treatment.
  • To compare caudate nucleus neurochemistry in pediatric OCD patients with healthy controls.
  • To explore the association between neurochemical changes and treatment response.

Main Methods:

  • Single-voxel proton magnetic resonance spectroscopy (1H-MRS) was used to examine the left caudate nucleus.

Related Experiment Videos

  • 11 drug-naive pediatric OCD patients (aged 8-17) underwent 1H-MRS before and after 12 weeks of paroxetine monotherapy.
  • 11 age-matched healthy children served as controls; a separate cohort underwent occipital cortex 1H-MRS.

    • Main Results:

    • Caudate nucleus glutamatergic concentrations (Glx) were significantly elevated in treatment-naive pediatric OCD patients compared to controls.
    • Paroxetine treatment led to a significant reduction in caudate Glx levels, normalizing them to those of controls.
    • The decrease in caudate Glx was significantly correlated with a reduction in OCD symptom severity.

    Conclusions:

    • Preliminary findings suggest abnormal glutamatergic neurotransmission in the caudate nucleus in pediatric OCD.
    • Paroxetine treatment may exert its therapeutic effects in pediatric OCD by modulating caudate Glx levels.
    • These results highlight the potential of neuroimaging to elucidate OCD mechanisms and treatment effects.