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Int J Biochem Cell Biol. 2010 Dec;42(12):1915-8. doi: 10.1016/j.biocel.2010.08.015. Epub 2010 Sep 15.

Pyroglutamate-Aβ: role in the natural history of Alzheimer's disease.

Author information

1
The Mental Health Research Institute, Parkville, VIC, Australia.

Abstract

The accumulation of amyloid-beta (Aβ) peptides is believed to be a central contributor to the neurodegeneration typically seen in Alzheimer's disease (AD) brain. Aβ extracted from AD brains invariably possesses extensive truncations, yielding peptides of differing N- and C-terminal composition. Whilst Aβ is often abundant in the brains of cognitively normal elderly people, the brains of AD patients are highly enriched for N-terminally truncated Aβ bearing the pyroglutamate modification. Pyroglutamate-Aβ (pE-Aβ) has a higher propensity for oligomerisation and aggregation than full-length Aβ, potentially seeding the accumulation of neurotoxic Aβ oligomers and amyloid deposits. In addition, pE-Aβ has increased resistance to clearance by peptidases, causing these peptides to persist in biological fluids and tissues. The extensive deposition of pE-Aβ in human AD brain is under-represented in many transgenic mouse models of AD, reflecting major differences in the production and processing of Aβ peptides in these models compared to the human disease state.

PMID:
20833262
DOI:
10.1016/j.biocel.2010.08.015
[Indexed for MEDLINE]

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