Figure 1.

Activated microglia are localized in brain areas affected by neurofibrillary tangles. Reactive microglia, stained by Iba1 antibody (red colour), are distributed throughout the brain regions affected by neurofibrillary lesions immunolabelled with AT8 (antibody recognizing phospho-tau, green colour) and DC11 (antibody recognizing Alzheimer's disease (AD)-specific misfolded tau, green colour). Activated microglia are surrounding tangle-bearing neurons in the hippocampus of an AD patient (A) and (B) and in the cortices of transgenic rats expressing truncated tau protein (C) and (D). Scale bars: 100 μm.