Intraneuronal amyloid β and reduced brain volume in a novel APP T714I mouse model for Alzheimer's disease
Abstract
Transgenic mouse models of Alzheimer's disease (AD) expressing high levels of amyloid precursor protein (APP) with familial AD (FAD) mutations have proven to be extremely useful in understanding pathogenic processes of AD especially those that involve amyloidogenesis. We earlier described Austrian APP T714I pathology that leads to one of the earliest AD age-at-onsets with abundant intracellular and extracellular amyloid deposits in brain. The latter strikingly was non-fibrillar diffuse amyloid, composed of N-truncated A beta 42 in absence of A beta 40. In vitro, this mutation leads to one of the highest A beta 42/A beta 40 ratios among all FAD mutations. We generated an APP T714I transgenic mouse model that despite having 10 times lower transgene than endogenous murine APP deposited intraneuronal A beta in brain by 6 months of age. Accumulations increased with age, and this was paralleled by decreased brain sizes on volumetric MRI, compared to age-matched and similar transgene-expressing APP wild-type mice, although, with these levels of transgenic expression we did not detect neuronal loss or significant memory impairment. Immunohistochemical studies revealed that the majority of the intraneuronal A beta deposits colocalized with late endosomal markers, although some A beta inclusions were also positive for lysosomal and Golgi markers. These data support earlier observations of A beta accumulation in the endosomal-lysosomal pathway and the hypothesis that intraneuronal accumulation of A beta could be an important factor in the AD pathogenesis.
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FAD transgenic mouse models with the highest level of amyloidogenic Aβ display particularly prominent early intraneuronal Aβ accumulation.
“FAD transgenic mouse models with the highest level of amyloidogenic Aβ display particularly prominent early intraneuronal Aβ accumulation [89, 106, 196].”
From Intraneuronal β-amyloid accumulation and synapse pathology in Alzheimer’s disease (2010) · cites this paper as [196]
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- Authors
- Van Broeck, B., Vanhoutte, G., Pirici, D., Van Dam, D., Wils, H., Cuijt, I., Vennekens, K., Zabielski, M., Michalik, A., Theuns, J., De Deyn, P. P., Van der Linden, A., Van Broeckhoven, C., & Kumar-Singh, S.
- Affiliations
- University of Antwerp (BE)
- Venue
- Neurobiology of Aging
- Publisher
- Elsevier BV
- Published
- 2008-02
- Volume
- 29
- Issue
- 2
- Pages
- 241-252
- ISSN
- 0197-4580 (ISSN-L)
- OpenAlex
- W2033686120
- Cited by
- 60
- References
- 41
- Citations by year
- 2025: 1 · 2022: 2 · 2021: 1 · 2020: 1 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 4 · 2014: 1 · 2013: 8 · 2012: 6
- FWCI
- 3.76
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neurobiology of Aging (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Universiteit Antwerpen
- Topics
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Keywords
- Alzheimer's disease, intraneuronal amyloid-beta, transgenic mouse model, familial Alzheimer's disease, brain atrophy, amyloid-beta 42/40 ratio, endolysosomal pathway, late endosomes, Golgi apparatus, lysosomes, amyloid precursor protein
- MeSH terms
- Alzheimer Disease, Analysis of Variance, Animals, Behavior, Animal, Brain, Disease Models, Animal, Enzyme-Linked Immunosorbent Assay, Humans, Isoleucine, Magnetic Resonance Imaging, Mice, Transgenic, Neurons, Peptide Fragments, Psychomotor Performance, Tyrosine, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, Maze Learning, Mice
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