Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 101, Issue 18, Pages 7181-7186Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0400285101
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Funding
- Intramural NIH HHS [Z01 AG000949] Funding Source: Medline
- NCRR NIH HHS [P51 RR000169, RR000169] Funding Source: Medline
- NIA NIH HHS [K24 AG000949, AG10606, R56 AG003376, AG003376, R37 AG010606, AG08702, R01 AG010606, R01 AG003376, P50 AG008702, R01 AG009219, AG09219] Funding Source: Medline
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The hippocampal formation contains a distinct population of neurons organized into separate anatomical subregions. Each hippocampal subregion expresses a unique molecular profile accounting for their differential vulnerability to mechanisms of memory dysfunction. Nevertheless, it remains unclear which hippocampal subregion is most sensitive to the effects of advancing age. Here we investigate this question by using separate imaging techniques, each assessing different correlates of neuronal function. First, we used MRI to map cerebral blood volume, an established correlate of basal metabolism, in the hippocampal subregions of young and old rhesus monkeys. Second, we used in situ hybridization to map Arc expression in the hippocampal subregions of young and old rats. Arc is an immediate early gene that is activated in a behavior-dependent manner and is correlated with spike activity. Results show that the dentate gyrus is the hippocampal subregion most sensitive to the effects of advancing age, which together with prior studies establishes a cross-species consensus. This pattern isolates the locus of age-related hippocampal dysfunction and differentiates normal aging from Alzheimer's disease.
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