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Related Experiment Videos

The cause-effect relationship between bone loss and Alzheimer's disease using statistical modeling.

Natalia Loskutova1, Amber S Watts2, Jeffrey M Burns3

  • 1American Academy of Family Physicians National Research Network, USA.

Medical Hypotheses
|December 30, 2018
PubMed
Summary

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Alzheimer's disease (AD) is linked to bone loss, potentially due to hypothalamic atrophy. However, leptin and IGF-1 do not appear to mediate this relationship, suggesting other mechanisms may be involved in AD bone loss.

Area of Science:

  • Neuroscience
  • Bone Biology
  • Gerontology

Background:

  • The central nervous system (CNS) regulates bone remodeling via hypothalamic pathways.
  • The impact of Alzheimer's disease (AD) on these central bone regulation mechanisms is unknown.

Purpose of the Study:

  • To investigate the relationship between hypothalamic atrophy and bone loss in AD.
  • To assess potential mediation by neural (leptin) and neurohumoral (IGF-1) pathways.

Main Methods:

  • Secondary analysis of a two-year longitudinal study using path analysis.
  • Included 71 early-stage AD patients and 69 controls, measuring bone density, body composition, hypothalamic volume, and serum biomarkers.
  • Longitudinal mediation modeling was employed.
Keywords:
Alzheimer’s diseaseBone lossCNSHypothalamusLeptinStatistical modeling

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Main Results:

  • Hypothalamic atrophy and bone loss were observed and associated in the AD group.
  • Bone loss may precede detectable brain changes.
  • Leptin increased in AD patients and correlated with hypothalamic atrophy, but did not mediate the atrophy-bone loss link.

Conclusions:

  • Bone loss in AD may be associated with neurodegenerative hypothalamic changes.
  • Further research is needed to elucidate mediating mechanisms and the temporal relationship between bone loss and AD.
  • Understanding this relationship could have diagnostic implications.