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Molecular Neurodegeneration

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Open Access 01-12-2012 | Research article

Transgenic APP expression during postnatal development causes persistent locomotor hyperactivity in the adult

Authors: Shaefali P Rodgers, Heather A Born, Pritam Das, Joanna L Jankowsky

Published in: Molecular Neurodegeneration | Issue 1/2012

Abstract

Background

Transgenic mice expressing disease-associated proteins have become standard tools for studying human neurological disorders. Transgenes are often expressed using promoters chosen to drive continuous high-level expression throughout life rather than temporal and spatial fidelity to the endogenous gene. This approach has allowed us to recapitulate diseases of aging within the two-year lifespan of the laboratory mouse, but has the potential for creating aberrant phenotypes by mechanisms unrelated to the human disorder.

Results

We show that overexpression of the Alzheimer’s-related amyloid precursor protein (APP) during early postnatal development leads to severe locomotor hyperactivity that can be significantly attenuated by delaying transgene onset until adulthood. Our data suggest that exposure to transgenic APP during maturation influences the development of neuronal circuits controlling motor activity. Both when matched for total duration of APP overexpression and when matched for cortical amyloid burden, animals exposed to transgenic APP as juveniles are more active in locomotor assays than animals in which APP overexpression was delayed until adulthood. In contrast to motor activity, the age of APP onset had no effect on thigmotaxis in the open field as a rough measure of anxiety, suggesting that the interaction between APP overexpression and brain development is not unilateral.

Conclusions

Our findings indicate that locomotor hyperactivity displayed by the tet-off APP transgenic mice and several other transgenic models of Alzheimer’s disease may result from overexpression of mutant APP during postnatal brain development. Our results serve as a reminder of the potential for unexpected interactions between foreign transgenes and brain development to cause long-lasting effects on neuronal function in the adult. The tet-off APP model provides an easy means of avoiding developmental confounds by allowing transgene expression to be delayed until the mice reach adulthood.

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Title: Transgenic APP expression during postnatal development causes persistent locomotor hyperactivity in the adult
Authors: Shaefali P Rodgers
Heather A Born
Pritam Das
Joanna L Jankowsky
Publication date: 01-12-2012
Publisher: BioMed Central
Published in: Molecular Neurodegeneration / Issue 1/2012
Electronic ISSN: 1750-1326
DOI: https://doi.org/10.1186/1750-1326-7-28

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Transgenic APP expression during postnatal development causes persistent locomotor hyperactivity in the adult

Abstract

Background

Results

Conclusions

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Background

Results

Conclusions

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