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Jutatip Guptarak1, Batbayar Tumurbaatar1, Michela Marcatti1

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This summary is machine-generated.

Non-toxic tau oligomers (tauO) found in non-demented individuals with Alzheimer's neuropathology (NDAN) may offer resilience against cognitive decline. Converting toxic tauO into less harmful forms could be a therapeutic strategy for Alzheimer's disease (AD).

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Area of Science:

  • Neuroscience
  • Biochemistry

Background:

  • Alzheimer's disease (AD) is a leading cause of dementia, characterized by toxic tau oligomers (tauO).
  • Individuals with extensive AD pathology but no dementia (Non-Demented with Alzheimer's Neuropathology - NDAN) exhibit cognitive resilience.
  • This resilience suggests tauO in NDAN cases may propagate non-toxically.

Purpose of the Study:

  • To investigate the distinct properties of brain-derived tau oligomers (BDTO) from AD patients and NDAN individuals.
  • To compare the neurotoxicity and cellular effects of AD-BDTO versus NDAN-BDTO.

Main Methods:

  • Isolation and characterization of BDTO from AD and NDAN brains.
  • In vitro assays (LTP, cell survival) and in vivo studies using intracerebroventricular injections in mice.
  • Analysis of autophagy markers, antioxidant responses, microglial phagocytosis, and behavioral tests (novel object recognition).

Main Results:

  • NDAN-BDTO showed significantly reduced synaptic and neuronal toxicity compared to AD-BDTO.
  • Mice injected with NDAN-BDTO exhibited preserved autophagy, robust antioxidant response, and increased microglial phagocytosis.
  • NDAN-BDTO-injected mice demonstrated better memory retention in behavioral tests.

Conclusions:

  • NDAN brains contain non-toxic tauO that propagate without causing neuronal death or cognitive decline.
  • Therapeutic strategies could focus on converting toxic tauO into less harmful forms to halt AD progression.
  • Investigating potential mutations or structural modifications in NDAN tauO may reveal novel resilience mechanisms.