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Basic Science and Pathogenesis.

Maggie N Benson1, Keith P Smith2, Vivien Csikos3

  • 1University of Kansas Medical Center, Kansas City, KS, USA.

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Mitophagy, the process of removing damaged mitochondria, is impaired in Alzheimer's disease (AD). This study found reduced mitophagy markers in AD mouse and human models, suggesting a link to amyloid beta pathology.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Genetics

Background:

  • Alzheimer's disease (AD) is characterized by amyloid beta (Aβ) plaques and neurofibrillary tangles.
  • Mitochondrial dysfunction and impaired mitophagy are observed in AD models.
  • The precise role of mitophagy in AD pathogenesis requires further elucidation.

Purpose of the Study:

  • To investigate the relationship between mitophagy mechanisms and Alzheimer's disease pathophysiology.
  • To assess mitophagy markers in various AD models, including mouse, iPSC-derived organoids, and human postmortem brain tissue.

Main Methods:

  • Mitochondrial DNA (mtDNA) copy number was quantified using qPCR in brain and autophagosome (AP) fractions from 5xFAD mice and wild-type (WT) controls.
  • iPSC-derived cerebral organoids and neurons from sporadic AD (sAD) and non-demented (ND) individuals were analyzed for mtDNA content and autophagy events.
  • Aβ levels were measured via ELISA, and lysosome content/autophagosome events were assessed using fluorescent dyes in human and iPSC-derived models.

Main Results:

  • Reduced AP mtDNA content was observed in 5xFAD mice and sAD organoids.
  • Elevated Aβ levels were detected across all AD models (mouse, organoid, human brain).
  • sAD-derived neurons exhibited decreased lysosome content and fewer autophagy events.

Conclusions:

  • Mitophagy is demonstrably impaired in mouse and iPSC models of Alzheimer's disease.
  • The findings suggest an association between impaired mitophagy, Aβ pathology, and other AD mechanisms.
  • Further research is needed to fully understand these complex relationships.