Quantitative MR analyses of the hippocampus: unspecific metabolic changes in aging

Journal of Neurology
András SzentkutiEmrah Düzel

Abstract

The age-related structural changes of the human hippocampus are not entirely understood. The goal of the present investigation was to understand better the nature of age-related hippocampal changes by a comparative MR-analysis of four complementary aspects of hippocampal integrity: total volume, metabolite concentration, neuron to glial cell ratio and amount of extracellular diffusion space for water. To that end, we applied MR-based methods of manual and computerized (voxel-based morphometry) volumetry, diffusion-weighted imaging and 1H MR spectroscopy to characterize specific age-related hippocampal effects in a group of 22 healthy old adults in comparison with a group of 13 healthy younger adults. Age-related reductions of the hippocampal N-acetyl aspartate to creatine/choline ratio together with only marginal age-related reductions in hippocampal volumes and increases in diffusion parameters suggest that the process of aging affects mainly the metabolic status of the hippocampus with little equivalent age-related changes in hippocampal cell density. The metabolic changes are unspecific as they are not restricted to the hippocampus but equally occur in measures obtained from extrahippocampal temporal lobe regions.

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Citations

Sep 1, 2005·Journal of Neurology·Emrah DüzelHans-Jochen Heinze
Mar 27, 2007·Cerebral Cortex·Nico BunzeckEmrah Düzel
Jul 15, 2006·Journal of Cognitive Neuroscience·K SchiltzE Düzel
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Mar 31, 2015·Neuroinformatics·Saman SargolzaeiMalek Adjouadi
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Aug 9, 2005·NeuroImage·Matthias J MüllerAndreas Fellgiebel
May 9, 2015·BMC Bioinformatics·Saman SargolzaeiMalek Adjouadi
Oct 28, 2009·Brain Research·Sandra DüzelEmrah Düzel
May 6, 2019·Australasian Physical & Engineering Sciences in Medicine·Efstratios KaravasilisIoannis Seimenis

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