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Does β-amyloid plaque formation cause structural injury to neuronal processes?

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Abstract

The precise role of β-amyloid plaque formation in the cascade of brain cell changes that lead to neurodegeneration and dementia in Alzheimer’s disease has been unclear. Studies have indicated that neuronal processes surrounding and within plaques undergo a series of biochemical and morphological alterations. Morphological alterations include reactive, degenerative and sprouting-related ’dystrophic’ neuritic structures, derived principally from axons, which involve specific changes in cytoskeletal proteins such as tau and NF triplet proteins. More compact and fibrous plaques are associated with more extensive neuritic pathology than non-fibrillar, diffuse β-amyloid deposits. Cortical apical dendritic processes are either ‘clipped’ by plaque formation or are bent around more compact plaques. Examination of cases of ‘pathological’ brain ageing, which may represent a preclinical form of Alzheimer’s disease, demonstrated that the earliest neuritic pathology associated with plaques was similar to the reactive changes that follow structural injury to axons.In vivo andin vitro experimental models of structural injury to axons produce identical reactive changes that subsequently lead to an attempt at regenerative sprouting by damaged axons. Thus, β-amyloid plaque formation may cause structural injury to axons that is subsequently followed by an aberrant sprouting response that presages neurodegeneration and dementia. Identification of the key neuronal alterations underlying the pathology of Alzheimer’s disease may provide new avenues for therapeutic intervention.

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Abbreviations

AD:

Alzheimer’s disease

DNs:

Dystrophic neurites

NFTs:

Neurofibrillary tangles

APP:

Amyloid precursor protein

NF:

Neurofilament

PHFs:

Paired helical filaments

ApoE:

Apolipoprotein E

cdk5:

Cyclin-dependent kinase 5

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Authors and Affiliations

  1. NeuroRepair Group, School of Medicine, University of Tasmania, Australia

    Adele Woodhouse, Adrian K. West, Jyoti A. Chuckowree, James C. Vickers & Tracey C. Dickson

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  1. Adele Woodhouse
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  3. Jyoti A. Chuckowree
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  4. James C. Vickers
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  5. Tracey C. Dickson
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Correspondence to Tracey C. Dickson.

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Woodhouse, A., West, A.K., Chuckowree, J.A. et al. Does β-amyloid plaque formation cause structural injury to neuronal processes?. neurotox res 7, 5–15 (2005). https://doi.org/10.1007/BF03033772

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  • DOI: https://doi.org/10.1007/BF03033772

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