Donanemab triggers acute microglial activation (ARIA-E). Patients achieving favorable M2-like phenotype show better p-tau217 normalization due to enhanced tau aggregate clearance, while persistent M1 phenotype may show biomarker dissociation. However, TSPO-PET M1/M2 specificity in humans is questionable—human microglia do not conform cleanly to the rodent M1/M2 dichotomy, and TSPO signals are non-specific for activation state.
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