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Molecular Neurodegeneration
Published in: Molecular Neurodegeneration 1/2017

Open Access 01-12-2017 | Research article

Anti-aggregant tau mutant promotes neurogenesis

Authors: Maria Joseph, Marta Anglada-Huguet, Katharina Paesler, Eckhard Mandelkow, Eva-Maria Mandelkow

Published in: Molecular Neurodegeneration | Issue 1/2017

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Abstract

Background

The microtubule-associated protein Tau plays a role in neurodegeneration as well as neurogenesis. Previous work has shown that the expression of the pro-aggregant mutant Tau repeat domain causes strong aggregation and pronounced neuronal loss in the hippocampus whereas the anti-aggregant form has no deleterious effects. These two proteins differ mainly in their propensity to form ß structure and hence to aggregate.

Methods

To elucidate the basis of these contrasting effects, we analyzed organotypic hippocampal slice cultures (OHSCs) from transgenic mice expressing the repeat domain (RD) of Tau with the anti-aggregant mutation (TauRDΔKPP) and compared them with slices containing pro-aggregant TauRDΔK. Transgene expression in the hippocampus was monitored via a sensitive bioluminescence reporter gene assay (luciferase).

Results

The expression of the anti-aggregant TauRDΔKPP leads to a larger volume of the hippocampus at a young age due to enhanced neurogenesis, resulting in an increase in neuronal number. There were no signs of activation of microglia and astrocytes, indicating the absence of an inflammatory reaction. Investigation of signaling pathways showed that Wnt-5a was strongly decreased whereas Wnt3 was increased. A pronounced increase in hippocampal stem cell proliferation (seen by BrdU) was observed as early as P8, in the CA regions where neurogenesis is normally not observed. The increase in neurons persisted up to 16 months of age.

Conclusion

The data suggest that the expression of anti-aggregant TauRDΔKPP enhances hippocampal neurogenesis mediated by the canonical Wnt signaling pathway, without an inflammatory reaction. This study points to a role of tau in brain development and neurogenesis, in contrast to its detrimental role in neurodegeneration at later age.
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Metadata
Title
Anti-aggregant tau mutant promotes neurogenesis
Authors
Maria Joseph
Marta Anglada-Huguet
Katharina Paesler
Eckhard Mandelkow
Eva-Maria Mandelkow
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Molecular Neurodegeneration / Issue 1/2017
Electronic ISSN: 1750-1326
DOI
https://doi.org/10.1186/s13024-017-0230-8

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