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Does frontal cortex hypometabolism in progressive supranuclear palsy result from subcortical dysfunction?
1Service de Neurologie, Hôpital Saint Luc, University of Louvain, Brussels, BelgiumHôpital de la Salpêtrière, Service de neurologie et neuropsychologie, INSERM U289 75651 Paris, FranceService Frédéric Joliot, CEA, Hôpital d'Orsay, 95401 Orsay, FranceLaboratory of Neuroscience, NIH, Bethesda, MD 20892, USAUnité INSERM U320, boulevard Becquerel, 14021 Caen, France.
European Journal of Neurology
|November 29, 2013
Summary
This study suggests that frontal cortex hypometabolism in progressive supranuclear palsy (PSP) originates from subcortical dysfunction, particularly involving the thalamus. Abnormal metabolic links highlight the thalamus's pivotal role in PSP brain changes.
Area of Science:
- Neuroscience
- Neurology
- Medical Imaging
Background:
- Progressive supranuclear palsy (PSP) is a neurodegenerative disease characterized by frontal lobe-like symptoms.
- Brain imaging in PSP often reveals hypometabolism predominantly in the frontal cortex.
- However, the most severe pathological changes are typically found in subcortical regions.
Purpose of the Study:
- To investigate the hypothesis that subcortical dysfunction causes frontal cortex hypometabolism in PSP.
- To examine the metabolic connections between cortical and subcortical brain regions in PSP patients.
Main Methods:
- Utilized previously collected positron emission tomography (PET) data from 20 PSP patients and 20 age-matched controls.
- Calculated interregional correlations of metabolic values in both PSP patients and controls.
- Compared metabolic coupling patterns between the two groups.
Main Results:
- PSP patients exhibited increased positive metabolic coupling between frontal and non-frontal cortical regions compared to controls.
- Abnormal metabolic linkages were observed between frontal cortex hypometabolism and thalamus hypometabolism.
- Thalamic hypometabolism was partly coupled to caudate nucleus hypometabolism in PSP patients.
Conclusions:
- The findings suggest a subcortical origin for frontal cortex hypometabolism in progressive supranuclear palsy.
- Thalamic activity appears to play a crucial role in the observed metabolic dysfunction.
- This highlights the importance of subcortical-cortical interactions in PSP pathophysiology.
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