Abstract
The E693Q mutation in the amyloid beta precursor protein (APP) leads to cerebral amyloid angiopathy (CAA), with recurrent cerebral hemorrhagic strokes and dementia. In contrast to Alzheimer disease (AD), the brains of those affected by hereditary cerebral hemorrhage with amyloidosis–Dutch type (HCHWA-D) show few parenchymal amyloid plaques. We found that neuronal overexpression of human E693Q APP in mice (APPDutch mice) caused extensive CAA, smooth muscle cell degeneration, hemorrhages and neuroinflammation. In contrast, overexpression of human wild-type APP (APPwt mice) resulted in predominantly parenchymal amyloidosis, similar to that seen in AD. In APPDutch mice and HCHWA-D human brain, the ratio of the amyloid-β40 peptide (Aβ40) to Aβ42 was significantly higher than that seen in APPwt mice or AD human brain. Genetically shifting the ratio of AβDutch40/AβDutch42 toward AβDutch42 by crossing APPDutch mice with transgenic mice producing mutated presenilin-1 redistributed the amyloid pathology from the vasculature to the parenchyma. The understanding that different Aβ species can drive amyloid pathology in different cerebral compartments has implications for current anti-amyloid therapeutic strategies. This HCHWA-D mouse model is the first to develop robust CAA in the absence of parenchymal amyloid, highlighting the key role of neuronally produced Aβ to vascular amyloid pathology and emphasizing the differing roles of Aβ40 and Aβ42 in vascular and parenchymal amyloid pathology.
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Acknowledgements
We would like to thank H. Widmer for experimental help; L. Walker, J. Ghiso and T. Saido for comments on this manuscript; and R. Nixon for support of the ELISA measurements. This work was supported by grants to M.J. from the Fritz Thyssen Foundation (Cologne, Germany), the EU under the sixth framework programme (priority: life sciences and health, LSHM-CT-2003-503330) and the Swiss National Science Foundation. This work was also supported by grants to P.M.M. from the National Institute on Aging and the National Institute of Neurological Disorders and Stroke.
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Supplementary Fig. 1
Intraneuronal Aβ in APPDutch and APPwt transgenic mice. NT12-immunostaining for Aβ (brown) in hippocampal CA1 neurons reveals intracellular human Aβ in a 29 month-old APPDutch (a) and a 24 month-old APPwt mouse (b), while no Aβ is detected in a 24 month-old non-transgenic control littermate (c). Bars are 20 μm (a–c). (JPG 56 kb)
Supplementary Table 1
Absolute Aβ levels in brains of pre-depositing and depositing transgenic mice, and HCHWA-D and AD patients. (PDF 19 kb)
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Herzig, M., Winkler, D., Burgermeister, P. et al. Aβ is targeted to the vasculature in a mouse model of hereditary cerebral hemorrhage with amyloidosis. Nat Neurosci 7, 954–960 (2004). https://doi.org/10.1038/nn1302
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DOI: https://doi.org/10.1038/nn1302
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