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Takeda, Shuko; Wegmann, Susanne; Cho, Hansang; DeVos, Sarah L; Commins, Caitlin; Roe, Allyson D; Nicholls, Samantha B; Carlson, George A; Pitstick, Rose; Nobuhara, Chloe K; Costantino, Isabel; Frosch, Matthew P; Müller, Daniel J; Irimia, Daniel; Hyman, Bradley T
Nature communications, 10/2015, Volume: 6, Issue: 1Journal Article
Tau pathology is known to spread in a hierarchical pattern in Alzheimer's disease (AD) brain during disease progression, likely by trans-synaptic tau transfer between neurons. However, the tau species involved in inter-neuron propagation remains unclear. To identify tau species responsible for propagation, we examined uptake and propagation properties of different tau species derived from postmortem cortical extracts and brain interstitial fluid of tau-transgenic mice, as well as human AD cortices. Here we show that PBS-soluble phosphorylated high-molecular-weight (HMW) tau, though very low in abundance, is taken up, axonally transported, and passed on to synaptically connected neurons. Our findings suggest that a rare species of soluble phosphorylated HMW tau is the endogenous form of tau involved in propagation and could be a target for therapeutic intervention and biomarker development.
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