Oxidative stress may be a major causal factor underlying the aging process. Protein carbonylation is a potential marker for age-related deleterious changes. The present study applies a proteomic approach to facilitate the elucidation of the biochemical mechanisms that cause decrements in brain function, as reflected by behavioral performance of aged mice in cognitive and psychomotor tasks. The main methodological focus of the studies is the development of an isotope-coded affinity-tag (ICAT) strategy to enable mechanistic and quantitative studies on protein carbonylation. The proposed studies will determine appropriate parameters for carbonyl-directed identification and differential quantification of aging-associated oxidation-sensitive proteins based on this ICAT strategy and using mass spectrometry. Results of proteome-wide survey of oxidatively induced carbonylation in the aging mouse brain and the identification of age-associated oxidation-sensitive proteins will be related to the severity of the age-associated attenuations in specific cognitive and psychomotor functions. To this end, specific aims include the synthesis of reagent(s) that enable differential proteomics studies on protein carbonylation and the development of methods for the determination of oxidatively induced carbonylation of brain proteins. Oxidative stress on a synaptosomal fraction from mouse brain will then be used to study the occurrence, pathways and extent of protein carbonylation in vitro. Ultimately, a correlation of in vivo carbonylation of specific aging-associated oxidation-sensitive proteins with age and behavioral impairment will be sought. Experimental design of this study will entail scoring groups of aged mice on a specific cognitive or psychomotor task for the proteomics survey with young mice used as a control. Specific brain regions and subcellular fractions to be targeted for identification of carbonylated proteins will be those showing age-associated oxidative stress as measured by various methods. The degree of association will be determined between performance in each task and the degree of specific carbonylation associated with individual aging-associated oxidation-sensitive proteins.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
5R01AG025384-03
Application #
7126850
Study Section
Special Emphasis Panel (ZAG1-ZIJ-5 (O1))
Program Officer
Wise, Bradley C
Project Start
2004-09-30
Project End
2009-08-31
Budget Start
2006-09-01
Budget End
2007-08-31
Support Year
3
Fiscal Year
2006
Total Cost
$277,326
Indirect Cost
Name
University of North Texas
Department
Microbiology/Immun/Virology
Type
Other Domestic Higher Education
DUNS #
110091808
City
Fort Worth
State
TX
Country
United States
Zip Code
76107
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Prokai, Laszlo; Guo, Jia; Prokai-Tatrai, Katalin (2014) Selective chemoprecipitation to enrich nitropeptides from complex proteomes for mass-spectrometric analysis. Nat Protoc 9:882-95
Prokai, Laszlo; Szarka, Szabolcs; Wang, Xiaoli et al. (2012) Capture of the volatile carbonyl metabolite of flecainide on 2,4-dinitrophenylhydrazine cartridge for quantitation by stable-isotope dilution mass spectrometry coupled with chromatography. J Chromatogr A 1232:281-7
Guo, Jia; Prokai-Tatrai, Katalin; Prokai, Laszlo (2012) Relative quantitation of protein nitration by liquid chromatography-mass spectrometry using isotope-coded dimethyl labeling and chemoprecipitation. J Chromatogr A 1232:266-75
Guo, Jia; Prokai, Laszlo (2012) Conversion of 3-nitrotyrosine to 3-aminotyrosine residues facilitates mapping of tyrosine nitration in proteins by electrospray ionization-tandem mass spectrometry using electron capture dissociation. J Mass Spectrom 47:1601-11
Rauniyar, Navin; Prokai, Laszlo (2011) Isotope-coded dimethyl tagging for differential quantification of posttranslational protein carbonylation by 4-hydroxy-2-nonenal, an end-product of lipid peroxidation. J Mass Spectrom 46:976-85
Guo, Jia; Prokai, Laszlo (2011) To tag or not to tag: a comparative evaluation of immunoaffinity-labeling and tandem mass spectrometry for the identification and localization of posttranslational protein carbonylation by 4-hydroxy-2-nonenal, an end-product of lipid peroxidation. J Proteomics 74:2360-9
Guo, Jia; Prokai-Tatrai, Katalin; Nguyen, Vien et al. (2011) Protein targets for carbonylation by 4-hydroxy-2-nonenal in rat liver mitochondria. J Proteomics 74:2370-9
Prokai-Tatrai, Katalin; Guo, Jia; Prokai, Laszlo (2011) Selective chemoprecipitation and subsequent release of tagged species for the analysis of nitropeptides by liquid chromatography-tandem mass spectrometry. Mol Cell Proteomics 10:M110.002923
Chaudhary, Pankaj; Sharma, Rajendra; Sharma, Abha et al. (2010) Mechanisms of 4-hydroxy-2-nonenal induced pro- and anti-apoptotic signaling. Biochemistry 49:6263-75

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