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Axonal injury within language network in primary progressive aphasia.

Marco Catani1, Massimo Piccirilli, Antonio Cherubini

  • 1Institute of Psychiatry, London, United Kingdom. spjumrc@iop.kcl.ac.uk

Annals of Neurology
|January 31, 2003
PubMed
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Proton magnetic resonance spectroscopy revealed asymmetrical axonal injury in primary progressive aphasia (PPA) patients. This finding may help differentiate PPA from Alzheimer's disease using brain metabolite changes.

Area of Science:

  • Neuroimaging
  • Neurology
  • Biochemistry

Background:

  • Primary progressive aphasia (PPA) involves progressive language impairment due to left hemisphere pathology.
  • Understanding the neurobiological underpinnings of PPA is crucial for diagnosis and treatment.

Purpose of the Study:

  • To investigate axonal fiber integrity in perisylvian language areas in PPA using in vivo proton magnetic resonance spectroscopy (1H-MRS).
  • To differentiate PPA from Alzheimer's disease (AD) based on brain metabolite profiles.

Main Methods:

  • 1H-MRS was employed to measure brain metabolites (NAA, mI, choline, creatine) in the superior longitudinal fasciculus (SLF) of PPA patients, AD subjects, and controls.
  • Metabolite ratios (NAA/Cr, mI/Cr, choline/Cr) were analyzed bilaterally within the SLF, a key language pathway.

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Main Results:

  • PPA patients exhibited an asymmetrical reduction in the N-acetylaspartate to creatine (NAA/Cr) ratio, predominantly on the left side, compared to AD and controls.
  • An increased myoinositol to creatine (mI/Cr) ratio was observed bilaterally in the PPA group versus controls.
  • No significant differences in the choline to creatine (choline/Cr) ratio were found among the groups.

Conclusions:

  • The findings suggest asymmetrical, focal axonal injury within the language network in PPA.
  • 1H-MRS metabolite ratios, particularly NAA/Cr, show potential as a biomarker to distinguish PPA from AD.