Proton MRS in Kennedy disease: absolute metabolite and macromolecular concentrations.
OBJECTIVE
To investigate whether glutamine and glutamate (Glx) were elevated in Kennedy Disease (KD), and whether pathological proteins were spectroscopically visible as altered macromolecular (MM) resonances.


METHODS
Ten patients with KD and twelve healthy volunteers were investigated using a stimulated echo acquisition mode (STEAM) spectroscopy sequence with metabolite-nulling.


RESULTS
The concentrations of Glx remained unchanged in KD. An increased myo-inositol (Ins), and elevated MM at 0.9 ppm were found within the motor area. The N-acetyl-aspartate (NAA)/creatine (Cr) ratio was negatively correlated to the number of cytosine adenosine guanine (CAG) repeats in the motor area.


CONCLUSIONS
The elevated MM at 0.9 ppm may be attributed to a pathologically altered protein in KD. Additionally, the changes of Ins point to a clinically unexpected involvement of the motor cortex. The correlation of NAA/Cr with the number of CAG repeats indicates a link between metabolites and genetic failure.
Department of Neuroradiology, Radiological Hospital of the University of Tuebingen, Tuebingen, Germany. irnia.mader@med.uni-tuebingen.de
Irina
I
Mader
Jochen
J
Karitzky
Uwe
U
Klose
Uwe
U
Seeger
Anne
A
Sperfeld
Thomas
T
Naegele
Fritz
F
Schick
Albert
A
Ludolph
Wolfgang
W
Grodd
D000328:Adult; D001224:Aspartic Acid / Q000031:analogs & derivatives* / Q000378:metabolism; D016022:Case-Control Studies; D002794:Choline / Q000378:metabolism; D003401:Creatine / Q000378:metabolism; D005260:Female; D018698:Glutamic Acid / Q000378:metabolism*; D005973:Glutamine / Q000378:metabolism*; D006801:Humans; D007294:Inositol / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000378:metabolism*; D009134:Muscular Atrophy, Spinal / Q000378:metabolism*; D011149:Pons / Q000378:metabolism*
D005973:Glutamine; D001224:Aspartic Acid; D018698:Glutamic Acid; D007294:Inositol; C000179:N-acetylaspartate; D003401:Creatine; D002794:Choline