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Broad white matter impairment in multiple system atrophy.

Natalia Del Campo1, Owen Phillips1,2,3, Françoise Ory-Magne1

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Human Brain Mapping
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PubMed
Summary

Multiple system atrophy (MSA) shows widespread white matter damage affecting both deep and superficial areas. These brain abnormalities correlate with motor and cognitive decline in MSA patients.

Keywords:
MRIdiffusion tensor imagingmultiple system atrophy

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Radiology

Background:

  • Multiple system atrophy (MSA) is a rare neurodegenerative disease defined by alpha-synuclein (α-syn) accumulation, primarily in oligodendrocytes.
  • Unlike Parkinson's disease (PD), MSA's α-syn pathology predominantly impacts brain white matter, the insulation for nerve fibers.
  • Prior imaging studies indicated focal white matter changes in MSA, necessitating a comprehensive, whole-brain analysis.

Purpose of the Study:

  • To investigate global white matter integrity in Multiple System Atrophy (MSA) using advanced neuroimaging techniques.
  • To compare whole-brain white matter differences between MSA patients, Parkinson's disease (PD) patients, and healthy controls.
  • To explore the relationship between observed white matter abnormalities and clinical symptoms in MSA.

Main Methods:

  • Acquired in vivo structural and diffusion magnetic resonance imaging (dMRI) data from 26 MSA patients, 26 healthy controls, and 23 PD patients.
  • Employed a refined whole-brain approach analyzing major fiber tracts and superficial white matter.
  • Utilized statistical analysis to identify significant differences in white matter diffusivity.

Main Results:

  • Multiple system atrophy (MSA) patients exhibited significant whole-brain white matter diffusivity abnormalities in both deep and superficial white matter compared to controls and PD patients (p < 0.001).
  • These widespread white matter changes in MSA were significantly associated with motor function (Unified MSA Rating Scale) and cognitive performance (Mini-Mental State Examination).
  • Parkinson's disease (PD) patients did not show these pervasive whole-brain white matter diffusivity abnormalities.

Conclusions:

  • The findings reveal pervasive white matter damage throughout the brain in MSA, consistent with widespread α-syn pathology in oligodendrocytes.
  • White matter impairment appears to be a central feature of MSA, directly correlating with clinical symptom severity.
  • This global white matter perspective highlights the critical role of white matter integrity in MSA pathogenesis and clinical presentation.