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Int. J. Mol. Sci. 2015, 16(1), 476-495; doi:10.3390/ijms16010476

The Effects of Endogenous Non-Peptide Molecule Isatin and Hydrogen Peroxide on Proteomic Profiling of Rat Brain Amyloid-β Binding Proteins: Relevance to Alzheimer’s Disease?

1
Department of Proteomic Research and Mass Spectrometry, Institute of Biomedical Chemistry, 10 Pogodinskaya Street, Moscow 119121, Russia
2
Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia
3
School of Biology, Lomonosov Moscow State University, Moscow 119191, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Charles A. Collyer
Received: 14 October 2014 / Accepted: 16 December 2014 / Published: 29 December 2014
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
View Full-Text   |   Download PDF [1005 KB, uploaded 29 December 2014]   |  

Abstract

The amyloid-β peptide is considered as a key player in the development and progression of Alzheimer’s disease (AD). Although good evidence exists that amyloid-β accumulates inside cells, intracellular brain amyloid-binding proteins remain poorly characterized. Proteomic profiling of rat brain homogenates, performed in this study, resulted in identification of 89 individual intracellular amyloid-binding proteins, and approximately 25% of them were proteins that we had previously identified as specifically binding to isatin, an endogenous neuroprotector molecule. A significant proportion of the amyloid-binding proteins (more than 30%) are differentially expressed or altered/oxidatively modified in AD patients. Incubation of brain homogenates with 70 µM hydrogen peroxide significantly influenced the profile of amyloid-β binding proteins and 0.1 mM isatin decreased the number of identified amyloid-β binding proteins both in control and hydrogen peroxide treated brain homogenates. The effects of hydrogen peroxide and isatin have been confirmed in optical biosensor experiments with purified glyceraldehyde-3-phosphate dehydrogenase, one of the known crucial amyloid-β binding proteins (also identified in this study). Data obtained suggest that isatin protects crucial intracellular protein targets against amyloid binding, and possibly favors intracellular degradation of this protein via preventing formation of amyloid-β oligomers described in the literature for some isatin derivatives. View Full-Text
Keywords: amyloid-β; amyloid-β binding proteins; proteomic profiling; rat brain; isatin; oxidative stress amyloid-β; amyloid-β binding proteins; proteomic profiling; rat brain; isatin; oxidative stress
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MDPI and ACS Style

Medvedev, A.E.; Buneeva, O.A.; Kopylov, A.T.; Gnedenko, O.V.; Medvedeva, M.V.; Kozin, S.A.; Ivanov, A.S.; Zgoda, V.G.; Makarov, A.A. The Effects of Endogenous Non-Peptide Molecule Isatin and Hydrogen Peroxide on Proteomic Profiling of Rat Brain Amyloid-β Binding Proteins: Relevance to Alzheimer’s Disease? Int. J. Mol. Sci. 2015, 16, 476-495.

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