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Neurodegener Dis. 2014;14(2):53-66. doi: 10.1159/000353634. Epub 2013 Oct 23.

Pyroglutamate-modified amyloid-β protein demonstrates similar properties in an Alzheimer's disease familial mutant knock-in mouse and Alzheimer's disease brain.

Author information

1
Department of Molecular Biomarkers, Merck Research Laboratories, Merck & Co., West Point, Pa., USA.

Abstract

BACKGROUND:

N-terminally truncated, pyroglutamate-modified amyloid-β (Aβ) peptides are major constituents of amyloid deposits in Alzheimer's disease (AD).

METHODS:

Using a newly developed ELISA for Aβ modified at glutamate 3 with a pyroglutamate (pE3Aβ), brain pE3Aβ was characterized in human AD in an AD mouse model harboring double knock-in amyloid precursor protein (APP)-KM670/671NL and presenilin 1 (PS1)-P264L (APP/PS1-dKI) mutations, and in a second mouse model with transgenic overexpression of human APP695 with APP-KM670/671NL (Tg2576).

RESULTS:

pE3Aβ increased in the AD brain versus age-matched controls, with pE3Aβ/total Aβ at 45 and 10%, respectively. Compared to controls, the AD brain demonstrated 8.5-fold increased pE3Aβ compared to non-pE3Aβ species, which increased 2.7-fold. In the APP/PS1-dKI brain, pE3Aβ/total Aβ increased from 7% at 3 months to 16 and 19% at 15 and 19 months, respectively. In Tg2576, pE3Aβ/total Aβ was only 1.5% at 19 months, suggesting that APP/PS1-dKI, despite less total Aβ compared to Tg2576 at comparable ages, more closely mimics AD brain pathology.

CONCLUSION:

This report supports a significant role for pE3Aβ in AD pathogenesis by confirming that pE3Aβ represents a large fraction of Aβ within the AD brain. Compared to the age-matched control brain, pE3Aβ increased to a greater extent compared to Aβ species without this N-terminal modification. Further, the APP/PS1-dKI model more closely resembles the AD brain in this regard, compared to the Tg2576 model.

PMID:
24158021
DOI:
10.1159/000353634
[Indexed for MEDLINE]

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