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Structural hippocampal network alterations during healthy aging: a multi-modal MRI study.

Amandine Pelletier1, Olivier Periot2, Bixente Dilharreguy3

  • 1University of Bordeaux, INCIA, UMR 5287 Talence, France ; CNRS, INCIA, UMR 5287 Talence, France ; EPHE Bordeaux, France.

Frontiers in Aging Neuroscience
|December 25, 2013
PubMed
Summary
This summary is machine-generated.

Healthy aging leads to hippocampal atrophy and reduced white matter integrity, particularly in the fornix. This fornix damage may mediate hippocampal volume loss, suggesting a key role in the aging brain.

Keywords:
DTIcingulumfornixhealthy aginghippocampal atrophylimbic systemmode of anisotropy

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Area of Science:

  • Neuroscience
  • Gerontology
  • Medical Imaging

Background:

  • Hippocampal atrophy is common in healthy aging.
  • The relationship between hippocampal volume and white matter (WM) integrity in aging is not well understood.
  • Limbic system connections are crucial for memory and cognition.

Purpose of the Study:

  • To investigate the association between hippocampal atrophy and WM integrity in healthy aging.
  • To determine if WM damage mediates hippocampal volume loss.
  • To explore the role of the fornix and cingulum bundle in age-related brain changes.

Main Methods:

  • 129 healthy aging subjects underwent morphological MRI for hippocampal volume assessment.
  • Diffusion Tensor Imaging (DTI) was used to evaluate WM integrity, specifically Fractional Anisotropy (FA).
  • Recursive regression analysis explored sequential relationships between hippocampal volume and fornix FA.

Main Results:

  • Increasing age correlated with reduced hippocampal volume and lower FA in the fornix and cingulum bundle.
  • Hippocampal atrophy was specifically linked to reduced fornix FA, not cingulum bundle alterations.
  • Forced entry regression indicated fornix FA, not hippocampal atrophy, significantly predicted age, suggesting mediation.

Conclusions:

  • Hippocampal atrophy in healthy aging may be mediated by a loss of fornix connections.
  • Structural alterations in the fornix contribute to age-related brain changes.
  • These findings shed light on neurodegenerative processes relevant to Alzheimer's disease.