Figure 4.

Tau oligomers induce synaptic dysfunction. (A) Representative Western blot of mouse hippocampus homogenate. The levels of synaptophysin, synapsin-1, and septin-11 were measured by band quantification and normalized with the levels of tubulin. PBSo indicates representative bands of hippocampal area injected with PBS in mice also injected with tau oligomers, PBSf indicates PBS injection in mice also injected with tau fibrils, and PBSm indicates PBS injection in mice also injected with tau monomers. (B) Synaptophysin levels were significantly lower in the hemispheres injected with tau oligomers in comparison with the ones injected with fibrils, monomers, or PBS. (C) No significant differences in the levels of synapsin-1 were observed. (D) Only the hemisphere injected with tau oligomers presents a decrease in the level of septin-11. Data are represented as the mean ± SE. *p < 0.01, n = 6