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Basic Science and Pathogenesis.

Kriti Shukla1, Zhi Zhang2, Casandra Salinas3

  • 1University of Oklahoma, Norman, OK, USA.

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Alzheimer's disease (AD) involves mitochondrial dysfunction. This study shows Amyloid Precursor Protein (APP) interacts with mitochondrial phosphatase PGAM5, potentially impacting mitophagy and AD progression.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Mitochondrial dysfunction is a hallmark of Alzheimer's disease (AD).
  • Amyloid Precursor Protein (APP) has been found in mitochondria, but its role there is unclear.
  • PGAM5, a mitochondrial phosphatase, regulates mitochondrial dynamics and mitophagy.

Purpose of the Study:

  • To investigate the interaction between APP and PGAM5.
  • To determine the role of this interaction in mitochondrial function in health and AD.

Main Methods:

  • In vitro pull-down assays and isothermal calorimetry (ITC) to characterize APP-PGAM5 binding.
  • Proximity ligation assays in mouse brains and astrocytes to detect endogenous interactions.
  • Subcellular fractionation to analyze protein localization in wildtype and AD mouse models.

Main Results:

  • APP's linker region binds to PGAM5.
  • APP and PGAM5 interact endogenously, potentially at mitochondria-associated membranes (MAMs).
  • APP carboxy-terminal fragments and PGAM5 localize to mitochondria; PGAM5 cleavage is reduced in AD mice.

Conclusions:

  • APP and PGAM5 interact physiologically.
  • Reduced PGAM5 cleavage in AD may impair mitophagy, contributing to mitochondrial dysfunction.
  • Understanding APP-PGAM5 interaction is crucial for AD therapeutic strategies, such as APP knockdown.