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Axonopathy in an APP/PS1 transgenic mouse model of Alzheimer’s disease

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Abstract

While axonopathy is a prominent feature in a variety of neurodegenerative diseases, it has been largely neglected in Alzheimer’s disease (AD), despite the observation of frequent motoric deficits in AD patients. In the present report we used transgenic mice overexpressing human mutant β-amyoid precursor protein (APP751SL) and presenilin-1 (PS1M146L) that exhibit elevated intraneuronal Aβ42 levels. We observed abundant age-dependent axonopathy in the spinal cord: axons immunopositive for ubiquitin in the dorsal column; axonal swellings (spheroids) which accumulated APP, neurofilament, and ubiquitin; as well as myelin ovoid structures, which serve as markers for nerve fiber degeneration in both white and gray matter. Both descending and ascending axonal tracts in white matter were affected. Neuritic plaques also developed in an age-dependent manner starting in the cervical region. Furthermore, early intraneuronal Aβ was detected in some but not all motor neurons before plaque formation. In the present APP/PS1 transgenic mouse model we could show for the first time that elevated intracellular Aβ levels lead to an axonopathy characterized by the formation of axonal spheroids and myelin ovoids. The same pathological alterations are known from AD patients or transgenic models overexpressing Tau or ApoE, however, these disturbances in axonal transport occur in the absence of any signs of concomitant Tau pathology. This strengthens the prevailing amyloid hypothesis as a primary trigger of AD-typical pathological alterations.

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Acknowledgements

The excellent technical support by Mrs. N. Hamsley and Mrs. H. Mader is greatfully acknowledged. Financial support was provided by intramural funding (HOMFOR program and Saarland University to O.W.), Fritz Thyssen Stiftung and by a Sanofi-Aventis research grant (to T.A.B.).

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Authors and Affiliations

  1. Department of Psychiatry, Division of Neurobiology, Saarland University, Building 90, 66421, Homburg, Saar, Germany

    Oliver Wirths, Jacek Szczygielski & Thomas A. Bayer

  2. Institute of Neuropathology, Technical University Aachen, Pauwelsstr. 30, Aachen, Germany

    Joachim Weis

  3. Institute for Biochemistry, Free University of Berlin, Thielallee 63, Berlin, Germany

    Gerd Multhaup

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  1. Oliver Wirths
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  2. Joachim Weis
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Correspondence to Thomas A. Bayer.

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Oliver Wirths and Joachim Weis contributed equally.

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Wirths, O., Weis, J., Szczygielski, J. et al. Axonopathy in an APP/PS1 transgenic mouse model of Alzheimer’s disease. Acta Neuropathol 111, 312–319 (2006). https://doi.org/10.1007/s00401-006-0041-4

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  • DOI: https://doi.org/10.1007/s00401-006-0041-4

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