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Summary
This summary is machine-generated.

Positron emission tomography (PET) imaging revealed accelerated tau and synaptic pathologies in female S305N mice, despite more severe cognitive deficits observed in males. This study highlights potential sex differences in tauopathy progression.

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Area of Science:

  • Neuroscience
  • Radiochemistry
  • Genetics

Background:

  • Tauopathy, characterized by tau protein hyperphosphorylation and aggregation, is implicated in over 20 neurodegenerative disorders, including Alzheimer's disease (AD) and frontotemporal dementia (FTD).
  • The MAPT10+3/S305N (S305N) mouse model exhibits key features of tauopathy, such as toxic 4-repeat tau isoforms, tau inclusions, and synaptic degeneration.

Purpose of the Study:

  • To investigate tau and synaptic pathologies in female and male S305N tauopathy mouse models using PET imaging.
  • To correlate PET findings with behavioral and pathological phenotypes to understand tauopathy progression and potential sex-based differences.

Main Methods:

  • PET/CT imaging was performed on S305N mice and non-mutated controls using [18F]OXD-2314 for tau isoforms and [18F]SynVesT-1 for synaptic vesicle glycoprotein 2A.
  • Cognitive function was assessed using the Barnes maze, and sleep patterns were monitored. Immunohistochemistry was used to analyze phosphorylated-tau levels.

Main Results:

  • Female S305N mice showed increased [18F]OXD-2314 uptake (tau pathology) and decreased [18F]SynVesT-1 uptake (synaptic loss) compared to controls, with no significant changes observed in males.
  • Both sexes exhibited cognitive and sleep impairments, with males showing more advanced cognitive deficits.
  • Immunohistochemistry confirmed increased tau aggregates in S305N mice across multiple brain regions, irrespective of sex.

Conclusions:

  • PET imaging demonstrated more rapid tau and synaptic pathology progression in female S305N mice, contrasting with more pronounced cognitive deficits in males.
  • Ongoing pathological assessments will further elucidate neurodegeneration. These findings support the utility of [18F]OXD-2314 and [18F]SynVesT-1 for future human tauopathy studies.