Glutamatergic regulation prevents hippocampal-dependent age-related cognitive decline through dendritic spine clustering

Ana C. Pereira, Hilary K. Lambert, Yael S. Grossman, Dani Dumitriu, Rachel Waldman, Sophia K. Jannetty, Katina Calakos, William G. Janssen, Bruce S. McEwen, John Morrison

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

The dementia of Alzheimer's disease (AD) results primarily from degeneration of neurons that furnish glutamatergic corticocortical connections that subserve cognition. Although neuron death is minimal in the absence of AD, age-related cognitive decline does occur in animals as well as humans, and it decreases quality of life for elderly people. Age-related cognitive decline has been linked to synapse loss and/or alterations of synaptic proteins that impair function in regions such as the hippocampus and prefrontal cortex. These synaptic alterations are likely reversible, such that maintenance of synaptic health in the face of aging is a critically important therapeutic goal. Here, we show that riluzole can protect against some of the synaptic alterations in hippocampus that are linked to age-related memory loss in rats. Riluzole increases glutamate uptake through glial transporters and is thought to decrease glutamate spillover to extrasynaptic NMDA receptors while increasing synaptic glutamatergic activity. Treated aged rats were protected against age-related cognitive decline displayed in nontreated aged animals. Memory performance correlated with density of thin spines on apical dendrites in CA1, although not with mushroom spines. Furthermore, riluzole-treated rats had an increase in clustering of thin spines that correlated with memory performance and was specific to the apical, but not the basilar, dendrites of CA1. Clustering of synaptic inputs is thought to allow nonlinear summation of synaptic strength. These findings further elucidate neuroplastic changes in glutamatergic circuits with aging and advance therapeutic development to prevent and treat age-related cognitive decline.

Original languageEnglish (US)
Pages (from-to)18733-18738
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume111
Issue number52
DOIs
StatePublished - Dec 30 2014
Externally publishedYes

Keywords

  • Cognitive aging
  • Dendritic spine clustering
  • Glutamate
  • Neuroplasticity
  • Riluzole

ASJC Scopus subject areas

  • General

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    Pereira, A. C., Lambert, H. K., Grossman, Y. S., Dumitriu, D., Waldman, R., Jannetty, S. K., Calakos, K., Janssen, W. G., McEwen, B. S., & Morrison, J. (2014). Glutamatergic regulation prevents hippocampal-dependent age-related cognitive decline through dendritic spine clustering. Proceedings of the National Academy of Sciences of the United States of America, 111(52), 18733-18738. https://doi.org/10.1073/pnas.1421285111