Proposed experiment from debate on Astrocytes adopt A1 (neurotoxic) and A2 (neuroprotective) phenotypes, but recent

SUMMARY

# Proposed experiment from debate on Astrocytes adopt A1 (neurotoxic) and A2 (neuroprotective) phenotypes, but recent ## Background and Rationale This falsification study tests the hypothesis that hexokinase 2 (HK2) metabolic activity determines astrocyte polarization toward neurotoxic A1 versus neuroprotective A2 phenotypes in neurodegeneration. The experiment employs selective HK2 inhibitors (2-deoxyglucose, 3-bromopyruvate) in cultured astrocytes to examine whether metabolic restriction promo

METHODOLOGY NOTES

**Phase 1: Cell Culture Preparation (Days 1-3)** • Culture primary mouse astrocytes or immortalized astrocyte cell lines (C8-D1A) in DMEM with 10% FBS • Expand cells to achieve n=6 biological replicates per condition across 4 treatment groups • Seed 1×10^5 cells per well in 6-well plates for metabolic assays, 5×10^4 cells per well in 24-well plates for phenotyping • Allow 24h attachment period before treatment initiation **Phase 2: Astrocyte Phenotype Induction (Days 4-6)** • **A1 Control Group**: Treat with LPS (100 ng/mL) + TNF-α (30 ng/mL) + IL-1α (3 ng/mL) for 24h • **A2 Control Group**: Treat with IL-4 (20 ng/mL) + IL-13 (20 ng/mL) for 24h • **HK2 Inhibitor Group**: Pre-treat with 2-deoxyglucose (5 mM) or 3-bromopyruvate (50 μM) for 2h, then add A1/A2 induction cocktails • **Vehicle Control**: DMSO (0.1%) with corresponding cytokine treatments **Phase 3: Real-time Metabolic Flux Analysis (Day 7)** • Use Seahorse XF96 Analyzer to measure oxygen consumption rate (OCR) and extracel