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2009-11-20

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cc by (c) Garcia Marin et al., 2009
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/126816

Diminished perisomatic GABAergic terminals on cortical neurons adjacent to amyloid plaques

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https://doi.org/10.3389/neuro.05.028.2009

Abstract

One of the main pathological hallmarks of Alzheimer's disease (AD) is the accumulation of plaques in the cerebral cortex, which may appear either in the neuropil or in direct association with neuronal somata. Since different axonal systems innervate the dendritic (mostly glutamatergic) and perisomatic (mostly GABAergic) regions of neurons, the accumulation of plaques in the neuropil or associated with the soma might produce different alterations to synaptic circuits. We have used a variety of conventional light, confocal and electron microscopy techniques to study their relationship with neuronal somata in the cerebral cortex from AD patients and APP/PS1 transgenic mice. The main finding was that the membrane surfaces of neurons (mainly pyramidal cells) in contact with plaques lack GABAergic perisomatic synapses. Since these perisomatic synapses are thought to exert a strong influence on the output of pyramidal cells, their loss may lead to the hyperactivity of the neurons in contact with plaques. These results suggest that plaques modify circuits in a more selective manner than previously thought.

Subject

Malaltia d'Alzheimer, Epilèpsia

Subject (English)

Alzheimer's disease, Epilepsy

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Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))
Articles publicats en revistes (Patologia i Terapèutica Experimental)

Citation

GARCIA MARIN, Virginia, et al. Diminished perisomatic GABAergic terminals on cortical
neurons adjacent to amyloid plaques. Frontiers in Neuroanatomy. 2009. Vol. 3. [consulted: 9 of August of 2026]. Available at: https://hdl.handle.net/2445/126816

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