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Basic Science and Pathogenesis.

Katharine Gibson1, Andrew B Tobin2

  • 1University of Glasgow, Glasgow, Please Select, United Kingdom.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 23, 2025
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Summary
This summary is machine-generated.

The M1 muscarinic acetylcholine receptor (M1 mAChR) plays a role in Alzheimer's disease tau propagation. Mapping M1 expression reveals its involvement in tau spread, suggesting therapeutic potential.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Neurofibrillary tangles (NFTs) of hyperphosphorylated tau are key in Alzheimer's disease (AD) progression.
  • Cholinergic system dysfunction is observed in AD.
  • M1 muscarinic acetylcholine receptor (M1 mAChR) activation shows promise in neurodegeneration models.

Purpose of the Study:

  • To map the expression of M1 mAChR and M1+ neurons in the brain.
  • To correlate M1 mAChR localization with tau propagation patterns.
  • To investigate the role of M1 mAChR in tau propagation.

Main Methods:

  • Utilized two genetically modified mouse models to visualize M1+ neurons and M1 mAChR localization.
  • Performed in vitro studies seeding human AD tau in cultured neurons.
  • Employed immunofluorescence and confocal microscopy for imaging and analysis.

Main Results:

  • High M1 mAChR and M1+ neuron expression was found in the hippocampus, cortex, and amygdala.
  • Differential expression patterns were observed in the hippocampus, with neurons in the pyramidal layer and receptors at the membrane.
  • Tau uptake and propagation were observed in M1-WT neurons but were reduced in M1-KO controls.

Conclusions:

  • M1 mAChR is expressed in brain regions critical for learning and memory.
  • M1 mAChR appears to play a role in tau propagation, as evidenced by reduced tau spread in M1-KO models.
  • Future studies will involve in vivo seeding of human AD tau in M1-expressing regions.