Document Detail


Capabilities of MS for Analytical Quantitative Determination of the Ratio of α- and βAsp7 Isoforms of the Amyloid-β Peptide in Binary Mixtures.
MedLine Citation:
PMID:  21410227     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
There is strong evidence that the amyloid-β peptide (Aβ) plays a crucial role in the pathogenesis of Alzheimer's disease (AD), a lethal neurodegenerative disorder of the elderly. During pathology development, the peptide as well as its various chemically modified isoforms is accumulated in specific brain tissues as characteristic proteinaceous deposits, the so-called amyloid plaques, which are the pathomorphological mark of AD, although the level of Αβ in the blood is the same for healthy individuals and for AD patients. Earlier, it has been shown that isomerization of aspartate 7, the most abundant post-translational modification of the Αβ peptide, is tightly involved in a set of molecular processes associated with AD progression. Therefore, the isoAsp 7-containing Αβ isomer (isoAβ) is assumed to be a potential biomarker of AD that can be identified in the blood. Here, we present an analytical mass spectrometric method for quantitative determination of the ratio of normal and isomerized Αβ fragments 1-16 in their binary mixtures, and all analytical capabilities, such as accuracy, detection limits, and sensitivity of the presented method, are determined and thoroughly discussed. On the basis of this method, an analytical approach for quantitative determination of this modification in the blood will be developed in further studies.
Authors:
Maria I Indeykina; Igor A Popov; Sergey A Kozin; Alexey S Kononikhin; Oleg N Kharybin; Philippe O Tsvetkov; Alexander A Makarov; Evgenij N Nikolaev
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-16
Journal Detail:
Title:  Analytical chemistry     Volume:  -     ISSN:  1520-6882     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Emanuel Institute of Biochemical Physics of the Russian Academy of Sciences , Kosygina Street 4, Moscow, Russia, 119334.
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