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Summary
This summary is machine-generated.

Aging impairs neuronal proteostasis, making specific entorhinal cortex neurons vulnerable to both age-related decline and tau accumulation, potentially explaining primary age-related tauopathy (PART) and Alzheimer's disease (AD).

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Area of Science:

  • Neuroscience
  • Aging Research
  • Molecular Biology

Background:

  • Aging is the primary risk factor for Alzheimer's disease (AD).
  • Aging compromises cellular proteostasis, leading to pathological protein accumulation, including tau.
  • Understanding age-related neuronal vulnerability is key to explaining primary age-related tauopathy (PART) and AD pathogenesis.

Purpose of the Study:

  • To investigate the intersection between neuronal populations vulnerable to age-related proteostasis deficits and those susceptible to tauopathy.
  • To elucidate the molecular mechanisms underlying neuronal vulnerability in aging and tau pathology.
  • To provide a framework for studying the relationship between PART and AD.

Main Methods:

  • Utilized spatial biology and computational techniques, including spatial cell-typing and multiplex imaging in aged mice.
  • Developed and employed novel mouse models for targeted tauopathy studies.
  • Analyzed single-nuclei multiome datasets and utilized a new spatial imaging technique, coppaFISH-3D.

Main Results:

  • Identified Layer 2/3 intra-telencephalic projecting entorhinal cortex neurons (L2/3 IT ENT) as uniquely accumulating p62 during healthy aging.
  • Demonstrated that L2/3 IT ENT neurons exhibit age-related downregulation of synapse and calcium-related gene networks.
  • Showed that these vulnerable L2/3 IT ENT neurons are also the primary targets of tau accumulation in a new MAPT KI mouse model.

Conclusions:

  • Neuronal populations susceptible to age-related proteostasis decline are also vulnerable to tau accumulation.
  • This overlap in vulnerability may explain the pathogenesis of PART and contribute to AD.
  • Findings highlight L2/3 IT ENT neurons as critical in the interplay between aging and tauopathy.