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Clustering of Tau fibrils impairs the synaptic composition of a3-Na+/K+-ATPase and AMPA receptors

Amulya Nidhi Shrivastava, Virginie Redeker , Laura Pieri, Luc Bousset, Marianne Renner, Karine Madiona, Caroline Mailhes-Hamon, Audrey Coens, Luc Buée, Philippe Hantraye, Antoine Triller, Ronald Melki


Tau assemblies have prion-like properties : they propagate from one neuron to another and amplify by seeding the aggregation of endogenous Tau. Although key in prion-like propagation, the binding of exogenous Tau assemblies to the plasma membrane of naïve neurons is not understood.
We report that fibrillar Tau forms clusters at the plasma membrane following lateral diffusion. We found that the fibrils interact with the Na+/K+-ATPase (NKA) and AMPA receptors.
The consequence of the clustering is a reduction in the amount of a3-NKA and an increase in the amount of GluA2-AMPA receptor at synapses. Furthermore, fibrillar Tau destabilizes functional NKA complexes. Tau and a-synuclein aggregates often coexist in patients’ brains. We now show evidences for cross-talk between these pathogenic aggregates with a-synuclein fibrils dramatically enhancing fibrillar Tau clustering and synaptic localization.
Our results suggest that fibrillar a-synuclein and Tau cross-talk at the plasma membrane imbalance neuronal homeostasis.

More information

The EMBO Journal (2019) e99871. DOI 10.15252/embj.201899871.