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Basic Science and Pathogenesis.
Jutatip Guptarak1, Batbayar Tumurbaatar1, Michela Marcatti1
1University of Texas Medical Branch, Galveston, TX, USA.
Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 24, 2025
Summary
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).
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.
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