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beta-site amyloid precursor protein cleaving enzyme 1 increases amyloid deposition in brain parenchyma but reduces cerebrovascular amyloid angiopathy in aging BACE x APP[V7171] double-transgenic mice

beta-site amyloid precursor protein cleaving enzyme 1 increases amyloid deposition in brain parenchyma but reduces cerebrovascular amyloid angiopathy in aging BACE x APP[V7171] double-transgenic mice
beta-site amyloid precursor protein cleaving enzyme 1 increases amyloid deposition in brain parenchyma but reduces cerebrovascular amyloid angiopathy in aging BACE x APP[V7171] double-transgenic mice
The generation of amyloid peptides (Aß) from the amyloid precursor protein (APP) is initiated by ß-secretase (BACE), whereas subsequent {gamma}-secretase cleavage mediated by presenilin-1, produces Aß peptides mainly of 40 or 42 amino acids long. In addition, alternative ß'-cleavage of APP at position 11 of the amyloid sequence results in N-truncated Aß(11-40/42) peptides, but the functional significance or pathological impact is unknown. Here we demonstrate that in the brain of BACE x APP[V717I] double-transgenic mice, amyloidogenic processing at both Asp1 and Glu11 is increased resulting in more and different Aß species and APP C-terminal fragments. Pathologically, BACE significantly increased the number of diffuse and senile amyloid plaques in old double-transgenic mice. Unexpectedly, vascular amyloid deposition was dramatically lower in the same BACE x APP[V717I] double-transgenic mice, relative to sex- and age-matched APP[V717I] single-transgenic mice in the same genetic background. The tight inverse relation of vascular amyloid to the levels of the less soluble N-terminally truncated Aß peptides is consistent with the hypothesis that vascular amyloid deposition depends on drainage of excess tissue Aß. This provides biochemical evidence in vivo for the preferential contribution of N-truncated Aß to parenchymal amyloid deposition in contrast to vascular amyloid pathology.
0002-9440
1621-1631
Willem, M.
b764ae4f-2aa4-4217-af6e-df1bf7a4d2a2
Dewachter, I.
75a4055d-009e-4b39-a495-7b6cd39db249
Smyth, N.
0eba2a40-3b43-4d40-bb64-621bd7e9d505
Dooren, T.
00d7921d-65ef-4db0-ab97-19465aef771e
Borghgraef, P.
98327f0a-4f8b-4341-a7ae-ea0da10f27d6
Haass, C.
83dcdbd6-fafa-406f-801c-a015eae0929f
Leuven, F.
43c230c2-5322-49b3-91d7-9d8da703d76a
Willem, M.
b764ae4f-2aa4-4217-af6e-df1bf7a4d2a2
Dewachter, I.
75a4055d-009e-4b39-a495-7b6cd39db249
Smyth, N.
0eba2a40-3b43-4d40-bb64-621bd7e9d505
Dooren, T.
00d7921d-65ef-4db0-ab97-19465aef771e
Borghgraef, P.
98327f0a-4f8b-4341-a7ae-ea0da10f27d6
Haass, C.
83dcdbd6-fafa-406f-801c-a015eae0929f
Leuven, F.
43c230c2-5322-49b3-91d7-9d8da703d76a

Willem, M., Dewachter, I., Smyth, N., Dooren, T., Borghgraef, P., Haass, C. and Leuven, F. (2004) beta-site amyloid precursor protein cleaving enzyme 1 increases amyloid deposition in brain parenchyma but reduces cerebrovascular amyloid angiopathy in aging BACE x APP[V7171] double-transgenic mice. The American Journal of Pathology, 165 (5), 1621-1631.

Record type: Article

Abstract

The generation of amyloid peptides (Aß) from the amyloid precursor protein (APP) is initiated by ß-secretase (BACE), whereas subsequent {gamma}-secretase cleavage mediated by presenilin-1, produces Aß peptides mainly of 40 or 42 amino acids long. In addition, alternative ß'-cleavage of APP at position 11 of the amyloid sequence results in N-truncated Aß(11-40/42) peptides, but the functional significance or pathological impact is unknown. Here we demonstrate that in the brain of BACE x APP[V717I] double-transgenic mice, amyloidogenic processing at both Asp1 and Glu11 is increased resulting in more and different Aß species and APP C-terminal fragments. Pathologically, BACE significantly increased the number of diffuse and senile amyloid plaques in old double-transgenic mice. Unexpectedly, vascular amyloid deposition was dramatically lower in the same BACE x APP[V717I] double-transgenic mice, relative to sex- and age-matched APP[V717I] single-transgenic mice in the same genetic background. The tight inverse relation of vascular amyloid to the levels of the less soluble N-terminally truncated Aß peptides is consistent with the hypothesis that vascular amyloid deposition depends on drainage of excess tissue Aß. This provides biochemical evidence in vivo for the preferential contribution of N-truncated Aß to parenchymal amyloid deposition in contrast to vascular amyloid pathology.

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Published date: 1 November 2004

Identifiers

Local EPrints ID: 55872
URI: http://eprints.soton.ac.uk/id/eprint/55872
ISSN: 0002-9440
PURE UUID: 909f88cd-b207-40ad-ace0-bb4b28ab450c

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Date deposited: 06 Aug 2008
Last modified: 07 Jan 2022 22:33

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Contributors

Author: M. Willem
Author: I. Dewachter
Author: N. Smyth
Author: T. Dooren
Author: P. Borghgraef
Author: C. Haass
Author: F. Leuven

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