Proposed experiment from debate on Perivascular spaces and glymphatic clearance failure in AD

SUMMARY

# Proposed experiment from debate on Perivascular spaces and glymphatic clearance failure in AD ## Background and Rationale This experiment investigates the mechanistic relationship between TREK-1 potassium channels and AQP4 polarization in the context of glymphatic clearance dysfunction associated with Alzheimer's disease. TREK-1 channels are mechanosensitive potassium channels expressed in astrocytes that respond to mechanical stimuli and may regulate astrocytic volume and function. The scient

METHODOLOGY NOTES

**Phase 1: Animal Preparation and Baseline Characterization (Days 1-7)** • Obtain 8-10 week old AQP4-GFP transgenic mice (n=48, equal male/female distribution) • Perform baseline cognitive assessment using Morris water maze and novel object recognition • Collect baseline CSF samples via cisterna magna puncture for Aβ40/42 and tau measurements • Establish baseline glymphatic function using fluorescent tracer injection (Texas Red 3kDa dextran) • Randomize animals into treatment groups: vehicle control (n=12), TREK-1 agonist ML335 (10mg/kg, n=12), TREK-1 antagonist spadin (5mg/kg, n=12), AD model + ML335 (n=12) **Phase 2: Real-time AQP4 Polarization Imaging (Days 8-14)** • Prepare acute brain slices (300μm thickness) from cortex and hippocampus • Mount slices in perfusion chamber with oxygenated aCSF at 32°C • Apply TREK-1 modulators via perfusion system (ML335 100nM, spadin 1μM) • Perform two-photon microscopy imaging of AQP4-GFP at perivascular endfeet • Quantify AQP4 polarization inde