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Acta Neuropathologica
Erschienen in: Acta Neuropathologica 6/2012

01.06.2012 | Original Paper

Cognitive defects are reversible in inducible mice expressing pro-aggregant full-length human Tau

verfasst von: Ann Van der Jeugd, Katja Hochgräfe, Tariq Ahmed, Jochen M. Decker, Astrid Sydow, Anne Hofmann, Dan Wu, Lars Messing, Detlef Balschun, Rudi D’Hooge, Eva-Maria Mandelkow

Erschienen in: Acta Neuropathologica | Ausgabe 6/2012

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Abstract

Neurofibrillary lesions of abnormal Tau are hallmarks of Alzheimer disease and frontotemporal dementias. Our regulatable (Tet-OFF) mouse models of tauopathy express variants of human full-length Tau in the forebrain (CaMKIIα promoter) either with mutation ΔK280 (pro-aggregant) or ΔK280/I277P/I308P (anti-aggregant). Co-expression of luciferase enables in vivo quantification of gene expression by bioluminescence imaging. Pro-aggregant mice develop synapse loss and Tau-pathology including missorting, phosphorylation and early pretangle formation, whereas anti-aggregant mice do not. We correlated hippocampal Tau pathology with learning/memory performance and synaptic plasticity. Pro-aggregant mice at 16 months of gene expression exhibited severe cognitive deficits in Morris water maze and in passive-avoidance paradigms, whereas anti-aggregant mice were comparable to controls. Cognitive impairment of pro-aggregant mice was accompanied by loss of hippocampal LTP in CA1 and CA3 areas and by a reduction of synaptic proteins and dendritic spines, although no neuronal loss was observed. Remarkably, memory and LTP recovered when pro-aggregant Tau was switched-OFF for ~4 months, Tau phosphorylation and missorting were reversed, and synapses recovered. Moreover, soluble and insoluble pro-aggregant hTau40 disappeared, while insoluble mouse Tau was still present. This study links early Tau pathology without neurofibrillary tangles and neuronal death to cognitive decline and synaptic dysfunction. It demonstrates that Tau-induced impairments are reversible after switching-OFF pro-aggregant Tau. Therefore, our mouse model may mimic an early phase of AD when the hippocampus does not yet suffer from irreversible cell death but cognitive deficits are already striking. It offers potential to evaluate drugs with regard to learning and memory performance.
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Metadaten
Titel
Cognitive defects are reversible in inducible mice expressing pro-aggregant full-length human Tau
verfasst von
Ann Van der Jeugd
Katja Hochgräfe
Tariq Ahmed
Jochen M. Decker
Astrid Sydow
Anne Hofmann
Dan Wu
Lars Messing
Detlef Balschun
Rudi D’Hooge
Eva-Maria Mandelkow
Publikationsdatum
01.06.2012
Verlag
Springer-Verlag
Erschienen in
Acta Neuropathologica / Ausgabe 6/2012
Print ISSN: 0001-6322
Elektronische ISSN: 1432-0533
DOI
https://doi.org/10.1007/s00401-012-0987-3

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