Searching for just a few words should be enough to get started. If you need to make more complex queries, use the tips below to guide you.
Article type: Research Article
Authors: Yang, Hongqiana | Lyutvinskiy, Yaroslava | Soininen, Hilkkac | Zubarev, Roman A.a; b; *
Affiliations: [a] Division of Physiological Chemistry I, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden | [b] Science for Life Laboratory, Stockholm, Sweden | [c] Department of Neurology, School of Medicine, University of Eastern Finland, Kuopio, Finland
Correspondence: [*] Correspondence to: Roman A. Zubarev, Division of Physiological Chemistry I, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden. E-mail: [email protected].
Abstract: Increased levels of isoaspartyl residues (isoAsp) have previously been found in proteins of Alzheimer's disease (AD) brains and in blood proteins of patients suffering from uremia, the disease sharing common pathological features with AD. One can hypothesize that higher levels of isoAsp should be present in blood proteins of AD patients. Also, because of higher AD prevalence in females, they can be expected to have higher level of isoAsp than males. Here we modified our recently developed proteome-wide isoAsp analysis approach for testing these hypotheses. Eight blood plasma samples pooled from 218 individuals suffering from either mild cognitive impairment (MCI) or AD were analyzed by tandem mass spectrometry using electron transfer dissociation. Based on specific fragmentation pattern of isoAsp, the healthy controls were found to contain lower level of isoAsp compared with age-matched MCI and AD patients (p = 0.03). This result was further validated (p = 0.05) by 96 individual sample analyses, giving the combined value of p ≈ 0.01. Female pooled samples were found to contain higher level of isoAsp than male in both pooled and individual samples, with overall p ≈ 0.01. These findings verify the above hypotheses, and provide protein candidates for further investigation of the link between isoAsp and AD.
Keywords: Aspartyl isomerization, blood plasma, electron capture dissociation, label-free quantification, tandem mass spectrometry
DOI: 10.3233/JAD-2011-110626
Journal: Journal of Alzheimer's Disease, vol. 27, no. 1, pp. 113-118, 2011
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
USA
Tel: +1 703 830 6300
Fax: +1 703 830 2300
[email protected]
For editorial issues, like the status of your submitted paper or proposals, write to [email protected]
IOS Press
Nieuwe Hemweg 6B
1013 BG Amsterdam
The Netherlands
Tel: +31 20 688 3355
Fax: +31 20 687 0091
[email protected]
For editorial issues, permissions, book requests, submissions and proceedings, contact the Amsterdam office [email protected]
Inspirees International (China Office)
Ciyunsi Beili 207(CapitaLand), Bld 1, 7-901
100025, Beijing
China
Free service line: 400 661 8717
Fax: +86 10 8446 7947
[email protected]
For editorial issues, like the status of your submitted paper or proposals, write to [email protected]
如果您在出版方面需要帮助或有任何建, 件至: [email protected]