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Caloric Restriction Improves Spatial Learning Deficits in Tau Mice.

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  • 1Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, USA.

Journal of Alzheimer'S Disease : JAD
|March 22, 2024
PubMed
Summary

Caloric restriction (CR) improves cognitive function in a tauopathy mouse model, despite limited impact on tau pathology. Early CR intervention may offer therapeutic benefits by reducing microglial activation.

Keywords:
Alzheimer’s diseasecalorie restrictionmicrogliaspatial learningtauopathy

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Area of Science:

  • Neuroscience
  • Aging Research
  • Neurodegenerative Diseases

Background:

  • Caloric restriction (CR) is known to delay aging and age-related diseases.
  • While CR's effects on amyloid pathology in Alzheimer's disease (AD) models are studied, its impact on tauopathy is less understood.

Purpose of the Study:

  • To investigate the effects of a short-term 30% CR regimen on spatial learning and tau pathology in a tauopathy mouse model.
  • To assess CR's impact on neuroinflammation and hippocampal cell proliferation in aging tauopathy mice.

Main Methods:

  • PS19 tau P301S and wildtype mice (4.5 and 7.5 months old) underwent a 6-week 30% CR regimen.
  • Spatial learning was evaluated using the Barnes Maze test.
  • Tau pathology, neuroinflammation, and hippocampal cell proliferation were assessed via immunohistochemistry and RT-qPCR.

Main Results:

  • CR improved age-dependent spatial learning deficits in PS19 mice.
  • CR showed limited effects on tau pathology and associated neuroinflammation.
  • A decrease in hippocampal cell proliferation, particularly Iba1+ cells, was observed under CR.

Conclusions:

  • CR confers cognitive benefits in tauopathy models, independent of significant disease pathology modulation.
  • Reduced microglial (Iba1+) cell proliferation under CR suggests potential therapeutic strategies, especially with early intervention.
  • CR's impact on cognitive function highlights its potential role in managing tauopathy-related cognitive decline.