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Published in: NeuroMolecular Medicine 2/2014

01-06-2014 | Original Paper

Altered Cerebrospinal Fluid Levels of Amyloid β and Amyloid Precursor-Like Protein 1 Peptides in Down’s Syndrome

Authors: Erik Portelius, Mikko Hölttä, Hilkka Soininen, Maria Bjerke, Henrik Zetterberg, Anni Westerlund, Sanna-Kaisa Herukka, Kaj Blennow, Niklas Mattsson

Published in: NeuroMolecular Medicine | Issue 2/2014

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Abstract

Down’s syndrome (DS) patients develop early Alzheimer’s disease pathology with abundant cortical amyloid plaques, likely due to overproduction of the amyloid precursor protein (APP), which subsequently leads to amyloid β (Aβ) aggregation. This is reflected in cerebrospinal fluid (CSF) levels of the 42-amino acid long Aβ peptide (Aβ1-42), which are increased in young DS patients and decreases with age. However, it is unclear whether DS also affects other aspects of Aβ metabolism, including production of shorter C- and N-terminal truncated Aβ peptides, and production of peptides from the amyloid precursor-like protein 1 (APLP1), which is related to APP, and cleaved by the same enzymatic processing machinery. APLP1-derived peptides may be surrogate markers for Aβ1-42 production in the brain. Here, we used hybrid immunoaffinity–mass spectrometry and enzyme-linked immunosorbent assays to monitor several Aβ and APLP1 peptides in CSF from DS patients (n = 12) and healthy controls (n = 20). CSF levels of Aβ1-42 and three endogenous peptides derived from APLP1 (APL1β25, APL1β27 and APL1β28) were decreased in DS compared with controls, while a specific Aβ peptide, Aβ1-28, was increased in a majority of the DS individuals. This study indicates that DS causes previously unknown specific alterations of APP and APLP1 metabolism.
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Metadata
Title
Altered Cerebrospinal Fluid Levels of Amyloid β and Amyloid Precursor-Like Protein 1 Peptides in Down’s Syndrome
Authors
Erik Portelius
Mikko Hölttä
Hilkka Soininen
Maria Bjerke
Henrik Zetterberg
Anni Westerlund
Sanna-Kaisa Herukka
Kaj Blennow
Niklas Mattsson
Publication date
01-06-2014
Publisher
Springer US
Published in
NeuroMolecular Medicine / Issue 2/2014
Print ISSN: 1535-1084
Electronic ISSN: 1559-1174
DOI
https://doi.org/10.1007/s12017-014-8302-1

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