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Related Experiment Videos

Neuroimaging studies in Rett syndrome.

S Naidu1, W E Kaufmann, M T Abrams

  • 1The Kennedy Krieger Institute and the Johns Hopkins University, Baltimore, MD 21205, USA. naidu@kennedykrieger.org

Brain & Development
|December 12, 2001
PubMed
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Neuroimaging reveals reduced brain volume in Rett Syndrome (RS), particularly in frontal lobes. This correlates with altered blood flow and neurochemistry, suggesting a basis for the disorder's symptoms.

Area of Science:

  • Neuroscience
  • Medical Imaging
  • Neurodevelopmental Disorders

Background:

  • Neuroimaging is crucial for non-invasively assessing brain structure and function.
  • Rett Syndrome (RS) is a neurodevelopmental disorder requiring understanding of its biological basis.
  • Previous studies have utilized various neuroimaging techniques to investigate brain changes in RS.

Purpose of the Study:

  • To investigate structural and functional brain alterations in Rett Syndrome using multiple neuroimaging modalities.
  • To elucidate the biological mechanisms underlying the clinical manifestations of Rett Syndrome.

Main Methods:

  • Volumetric Magnetic Resonance Imaging (MRI) for brain volume analysis.
  • Magnetic Resonance Spectroscopy (MRS) for neurochemical profiling (choline, n-acetyl aspartate).

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  • Diffusion Tensor Imaging (DTI) and MRI for cerebral blood flow.
  • Positron Emission Tomography (PET) with ((18)F)-fluorodeoxyglucose (FDG) for glucose metabolism.

    • Main Results:

    • Global reductions in gray and white matter volume observed in RS patients.
    • Selective vulnerability of frontal lobes indicated by reduced blood flow, altered MRS metabolites (increased choline, decreased NAA), and increased FDG uptake.
    • Hypothesized link between increased glucose uptake and enhanced glutamate cycling in synapses.

    Conclusions:

    • Neuroimaging findings suggest global brain volume reduction and specific frontal lobe abnormalities in RS.
    • Altered neurochemistry and metabolism in frontal regions may contribute to neuroexcitotoxic injury.
    • These changes are hypothesized to underlie common RS symptoms like seizures and respiratory irregularities.