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Structural and functional magnetic resonance imaging correlates of motor network dysfunction in primary progressive
Antonia Ceccarelli1, Maria A Rocca, Paola Valsasina
1Neuroimaging Research Unit, Institute of Experimental Neurology, Scientific Institute and University Ospedale San Raffaele, Via Olgettina, 60, 20132 Milan, Italy.
The European Journal of Neuroscience
|March 30, 2010
Summary
Patients with primary progressive multiple sclerosis (PPMS) exhibit altered brain activity and connectivity in motor networks. These functional changes correlate with underlying white matter damage, indicating a complex interplay between structure and function in PPMS.
Area of Science:
- Neuroscience
- Neurology
- Medical Imaging
Background:
- Primary progressive multiple sclerosis (PPMS) is a neurodegenerative disease characterized by progressive motor dysfunction.
- Understanding the neural underpinnings of motor network alterations in PPMS is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the functional and structural changes in motor networks of patients with PPMS using combined fMRI and diffusion tensor tractography.
- To identify correlations between functional brain activity, connectivity, and white matter integrity in the motor system of PPMS patients.
Main Methods:
- Functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) were performed on 15 PPMS patients and 15 healthy controls during a motor task.
- Tractography analyzed white matter integrity in key motor pathways, including the corpus callosum and corticospinal tract.
- Statistical parametric mapping analyzed fMRI activations and functional connectivity, with specific statistical thresholds applied.
Main Results:
- PPMS patients showed increased fMRI activations in sensorimotor areas, cerebellum, basal ganglia, and visual cortex compared to controls.
- Functional connectivity patterns differed, with controls showing stronger connectivity between primary sensorimotor cortex and inferior frontal gyrus, while PPMS patients exhibited altered connectivity.
- Significant correlations (r ≈ 0.83) were observed between altered functional activations and structural white matter damage in motor tracts.
Conclusions:
- PPMS patients display compensatory or aberrant functional reorganization within sensorimotor networks.
- Abnormal functional connectivity and increased brain activations in PPMS are linked to underlying white matter tract damage.
- These findings highlight the intricate relationship between structural integrity and functional network dynamics in PPMS motor dysfunction.
