Quantitative proton magnetic resonance spectroscopy detects abnormalities in dorsolateral prefrontal cortex and motor cortex of patients with frontotemporal lobar degeneration |
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Authors: | Sanjeev Chawla Sumei Wang Peachie Moore John H Woo Lauren Elman Leo F McCluskey Elias R Melhem Murray Grossman Harish Poptani |
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Institution: | (1) Department of Radiology, University of Pennsylvania, B6 Blockley Hall, 423 Guardian Drive, Philadelphia, PA 19104, USA;(2) Department of Neurology, University of Pennsylvania, Philadelphia, PA, USA; |
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Abstract: | Frontotemporal lobar degeneration (FTLD) is a neurodegenerative disease of the frontal and temporal neocortex. The single
most common pathology underlying FTLD is neuronal degeneration with ubiquitin-positive but tau-negative inclusions consisting
of Tar DNA binding proteins (TDP-43). Inclusions containing TDP-43 in neurons are also the most common pathology underlying
motor neuron disease (MND). The present study tested the hypothesis that abnormal metabolite patterns within the dorsolateral
prefrontal cortex (DLPFC) as well as the motor cortex (MC) may be observed in FTLD patients without motor disorders, using
proton magnetic resonance spectroscopy (1H MRS). Twenty-six FTLD patients with cognitive damage and ten controls underwent multivoxel 1H MRS. Absolute concentrations of N-acetyl aspartate (NAA), creatine (Cr), choline (Cho) and myo-inositol (mI) were measured from the DLPFC, the MC and the parietal
cortex (PC, an internal control). Statistical analyses were performed for group differences between FTLD patients and controls.
Comparisons were also made across brain regions (PC and DLPFC; PC and MC) within FTLD patients. Significant reductions in
NAA and Cr along with increased Cho and mI were observed in the DLPFC of FTLD patients compared to controls. Significantly
lower NAA and higher Cho were also observed in the MCs of patients as compared to controls. Within the FTLD patients, both
the MC and the DLPFC exhibited significantly decreased NAA and elevated Cho compared to the PC. However, only the DLPFC had
significantly lower Cr and higher mI. Abnormal metabolite pattern from the MC supports the hypothesis that FTLD and MND may
be closely linked. |
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