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We used an inducible mouse model expressing the Tau repeat domain with the pro-aggregant mutation ΔK280 to analyze presynaptic Tau pathology in the hippocampus.    Results  Expression of pro-aggregant Tau RDΔ  leads to phosphorylation, aggregation and missorting of Tau in area CA3. To test presynaptic pathophysiology we used electrophysiology in the mossy fiber tract. Synaptic transmission was severely disturbed in pro-aggregant Tau RDΔ  and Tau-knockout mice. Long-term depression of the mossy fiber tract failed in pro-aggregant Tau RDΔ  mice. We observed an increase in bouton size, but a decline in numbers and presynaptic markers. Both pre-and postsynaptic structural deficits are preventable by inhibition of Tau RDΔ  aggregation. Calcium imaging revealed progressive calcium dysregulation in boutons of pro-aggregant Tau RDΔ  mice. In N2a cells we observed this even in cells without tangle load, whilst in primary hippocampal neurons transient Tau RDΔ  expression alone caused similar Ca ++  dysregulation. Ultrastructural analysis revealed a severe depletion of synaptic vesicles pool in accordance with synaptic transmission impairments.    Conclusions  We conclude that oligomer formation by Tau RDΔ  causes pre- and postsynaptic structural deterioration and Ca ++  dysregulation which leads to synaptic plasticity deficits.    Electronic supplementary material  The online version of this article (doi:10.1186/s40478-015-0193-3) contains supplementary material, which is available to authorized users.

Pro-aggregant Tau impairs mossy fiber plasticity due to structural changes and Ca++ dysregulation