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Published on: March 23, 2011
Attenuated long-term Arc expression in the aged fascia dentata
Diano F Marrone1, Elham Satvat, Michael J Shaner
1Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ 85724, USA.
Neurobiology of Aging
|September 21, 2010
Summary
Aging impairs memory stabilization by reducing long-term Arc gene transcription in the fascia dentata (FD) of the hippocampus. This decline in Arc expression correlates with diminished spatial memory in aged rats.
Area of Science:
- Neuroscience
- Aging Research
- Molecular Biology
Background:
- Memory stabilization is crucial for forming enduring memories.
- Aging is associated with defects in memory consolidation and hippocampal function.
- The immediate early gene Arc plays a role in memory and synaptic plasticity.
Purpose of the Study:
- To investigate how aging affects long-term Arc gene transcription in the fascia dentata (FD).
- To determine if age-related changes in Arc expression correlate with spatial memory deficits.
Main Methods:
- Young and aged rats underwent a two-trial spatial exploration task with an 8-hour interval.
- Fascia dentata (FD) Arc transcription was assessed 8 hours after the second exploration.
- Spatial memory performance was evaluated.
Main Results:
- Aged rats exhibited significantly lower Arc transcription in the FD compared to young rats.
- The reduction in Arc expression in aged rats was correlated with impaired spatial memory recall.
- Fewer granule cells in aged FD transcribed the Arc gene after spatial exploration.
Conclusions:
- Aging alters long-term Arc gene transcription in the hippocampus.
- Reduced Arc expression in the aged FD is linked to deficits in spatial memory consolidation.
- The fascia dentata is integral to neural circuits supporting durable memory, and its function declines with age.
