Cited by 201Dementia and Cognitive Impairment ResearchMemory Processes and InfluencesAlzheimer's disease research and treatments

Temporal lobe functional activity and connectivity in young adult APOE ɛ4 carriers

Open access
Dennis, Nancy A., Browndyke, Jeffrey N., Stokes, Jared, Need, Anna, Burke, James R., Welsh‐Bohmer, Kathleen A., Cabeza, Roberto·2010·Alzheimer's & Dementia

Abstract

Background: We sought to determine if the APOE ε4 allele influences both the functional activation and connectivity of the medial temporal lobes (MTLs) during successful memory encoding in young adults. Methods: Twenty‐four healthy young adults, i.e., 12 carriers and 12 noncarriers of the APOE ε4 allele, were scanned in a subsequent‐memory paradigm, using event‐related functional magnetic resonance imaging. The neuroanatomic correlates of successful encoding were measured as greater neural activity for subsequently remembered versus forgotten task items, or in short, encoding success activity (ESA). Group differences in ESA within the MTLs, as well as whole‐brain functional connectivity with the MTLs, were assessed. Results: In the absence of demographic or performance differences, APOE ε4 allele carriers exhibited greater bilateral MTL activity relative to noncarriers while accomplishing the same encoding task. Moreover, whereas ε4 carriers demonstrated a greater functional connectivity of ESA‐related MTL activity with the posterior cingulate and other peri‐limbic regions, reductions in overall connectivity were found across the anterior and posterior cortices. Conclusions: These results suggest that the APOE ɛ4 allele may influence not only functional activations within the MTL, but functional connectivity of the MTLs to other regions implicated in memory encoding. Enhanced functional connectivity of the MTLs with the posterior cingulate in young adult ε4 carriers suggests that APOE may be expressed early in brain regions known to be involved in Alzheimer's disease, long before late‐onset dementia is a practical risk or consideration. These functional connectivity differences may also reflect pleiotropic effects of APOE during early development.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/j.jalz.2009.07.003

Cites

59 of 59 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Previous studies have already linked APOE4 to increased (hyper-)metabolism in young individuals.

    “However, previous studies have already linked APOE4 to increased (hyper-)metabolism in young individuals.”

    From APOE4 Increases Energy Metabolism in APOE-Isogenic iPSC-Derived Neurons (2024) · cites this paper as [44]

    The Discussion reports greater memory-encoding-related hippocampal activity in young adult APOE ε4 carriers than in non-carriers and cites a similar finding in another young-adult study. The paper measures fMRI activity, however, not metabolism; its findings do not establish hypermetabolism. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Studies in young adults, before the onset of a pathology, showed that APOE4 carriers display hypermetabolism and hyperactivity in distinct brain regions, such as the hippocampus, entorhinal cortex, and cortical regions.

    “Studies in young adults, before the onset of a pathology, showed that APOE4 carriers display hypermetabolism and hyperactivity in distinct brain regions, such as the hippocampus, entorhinal cortex, and cortical regions [44,45,46].”

    From APOE4 Increases Energy Metabolism in APOE-Isogenic iPSC-Derived Neurons (2024) · cites this paper as [44]

    The Discussion (page not provided) reports greater memory-encoding activity in the hippocampus and parahippocampal gyrus of healthy young adult APOE ε4 carriers. It does not establish hypermetabolism or greater activity in the entorhinal cortex or other cortical regions; it instead reports reduced connectivity with other task-associated cortical regions. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Healthy young and middle-aged adult apoE4 carriers show increased hippocampal activation during encoding task performance.

    “and increased hippocampal activation during encoding task performance [179–181]”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. Dickerson BC Goncharova I Sullivan MP Forchetti C Wilson RS Bennett DA MRI-derived entorhinal and hippocampal atrophy in incipient and very mild Alzheimer's disease Neurobiology of Aging 2001 22 747 754 11705634

Cited by

Sorted by citations

Authors
Dennis, N. A., Browndyke, J. N., Stokes, J., Need, A., Burke, J. R., Welsh‐Bohmer, K. A., & Cabeza, R.
Affiliations
  • Pennsylvania State University (US)
  • Duke University (US)
  • Joseph and Kathleen Bryan Alzheimer's Disease Research Center Duke University Durham NC USA
Corresponding author
Browndyke, Jeffrey N.
Venue
Alzheimer's & Dementia
Publisher
Wiley
Published
2009-09-10
Volume
6
Issue
4
Pages
303-311
ISSN
  • 1552-5260 (ISSN-L)
  • 1552-5279
OpenAlex
W2132091452
Cited by
201
References
57
Citations by year
2026: 4 · 2025: 13 · 2024: 7 · 2023: 9 · 2022: 8 · 2021: 12 · 2020: 11 · 2019: 12 · 2018: 8 · 2017: 13 · 2016: 12 · 2015: 11 · 2014: 27 · 2013: 14 · 2012: 17
FWCI
8.22
Type
journal article
Language
en
Open access
Locations
  • Alzheimer s & Dementia (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (P30‐AG028377, R01‐AG23770, L30‐AG029001)
  • National Institute on Aging
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
APOE ε4, medial temporal lobe
MeSH terms
Female, Genotype, Heterozygote, Hippocampus, Humans, Image Processing, Computer-Assisted, Functional Laterality, Magnetic Resonance Imaging, Male, Memory, Neural Pathways, Neuropsychological Tests, Photic Stimulation, Psychomotor Performance, Temporal Lobe, Reverse Transcriptase Polymerase Chain Reaction, Apolipoprotein E4, Young Adult

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review