Journal
NEUROBIOLOGY OF AGING
Volume 50, Issue -, Pages 13-24Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.neurobiolaging.2016.10.012
Keywords
Alzheimer's disease; Inflammation; PGE(2); Synaptic plasticity; Hippocampus; APP/PS1
Categories
Funding
- Conseil Regional d'Aquitaine
- Fondation pour la Recherche Medicale
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Alzheimer's disease (AD) is a progressive neurodegenerative disease characterized by early cognitive deficits linked to synaptic dysfunction and loss. Considerable evidence suggests that neuroinflammation contributes to AD. Prostaglandin E-2 (PGE(2)), a key neuroinflammatory molecule, modulates hippocampal synaptic transmission and plasticity. We investigated the effect of PGE(2) on synaptic transmission and presynaptic plasticity at synapses between mossy fibers from the dentate gyrus and CA3 pyramidal cells (Mf-CA3 synapse). These synapses are involved in mnemonic processes and consequently may be of relevance for AD. We provide evidence that although PGE(2) had no effect both on either basal transmission or short-term plasticity, it strongly impaired presynaptic Mf-CA3 long-term potentiation (LTP) by acting on PGE(2) receptor 3 (EP3) receptors. During aging, hippocampal levels of PGE(2) markedly increased in the APP/PS1 mouse model of AD and impaired specifically presynaptic LTP via a PGE(2)-EP3 signaling pathway. In summary, the building up of PGE(2) during the progression of AD leads to specific impairment of hippocampal presynaptic plasticity and highlights EP3 receptors as a potential target to alleviate cognitive deficits in AD. (C) 2016 Elsevier Inc. All rights reserved.
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