early cortical changes in gamma oscillations in alzheimer’s disease

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ID: 146058
2016
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Abstract
The entorhinal cortices in the temporal lobe of the brain are key structures relaying memory related information between the neocortex and the hippocampus. The medial entorhinal cortex (MEC) routes spatial information whereas the lateral entorhinal cortex (LEC) routes predominantly olfactory information to the hippocampus. Gamma oscillations are known to coordinate information transfer between brain regions by precisely timing population activity of neuronal ensembles. Here we studied the organization of in vitro gamma oscillations in the MEC & LEC of the transgenic (tg) APP-PS1 mouse model of Alzheimer’s Disease (AD) at 4 – 5 months of age. In vitro gamma oscillations using the kainate model peaked between 30 - 50 Hz and therefore we analyzed the oscillatory properties in the 20 – 60 Hz range. Our results indicate that the LEC shows clear alterations in frequency and power of gamma oscillations early-on in AD as compared to the MEC. The gamma-frequency oscillation slows down in the LEC and also the gamma power in dorsal LEC is decreased as early as 4 – 5 months in the tg APP-PS1 mice. The results of this study suggest that the timing of olfactory inputs from LEC to the hippocampus might be affected early on in AD, resulting in a possible erroneous integration of the information carried by the two input pathways to the hippocampal subfields.
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klein2016frontiersearly Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Alexandra Klein;Alexandra Klein;José R. Donoso;José R. Donoso;Richard Kempter;Richard Kempter;Dietmar Schmitz;Dietmar Schmitz;Dietmar Schmitz;Dietmar Schmitz;Dietmar Schmitz;Prateep Beed;Prateep Beed;Prateep Beed
Journal Vacuum
Year 2016
DOI
10.3389/fnsys.2016.00083
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