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Proteomic study on gender differences in aging kidney of mice
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
2009 (English)In: Proteome Science, ISSN 1477-5956, Vol. 7, no 16Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: This study aims to analyze sex differences in mice aging kidney. We applied a proteomic technique based on subfractionation, and liquid chromatography coupled with 2-DE. Samples from male and female CD1-Swiss outbred mice from 28 weeks, 52 weeks, and 76 weeks were analysed by 2-DE, and selected proteins were identified by matrix assisted laser desorption ionisation time-of-flight mass spectrometry (MALDI-TOF MS).

RESULTS: This proteomic analysis detected age-related changes in protein expression in 55 protein-spots, corresponding to 22 spots in males and 33 spots in females. We found a protein expression signature (PES) of aging composed by 8 spots, common for both genders. The identified proteins indicated increases in oxidative and proteolytic proteins and decreases in glycolytic proteins, and antioxidant enzymes.

CONCLUSION: Our results provide insights into the gender differences associated to the decline of kidney function in aging. Thus, we show that proteomics can provide valuable information on age-related changes in expression levels of proteins and related modifications. This pilot study is still far from providing candidates for aging-biomarkers. However, we suggest that the analysis of these proteins could suggest mechanisms of cellular aging in kidney, and improve the kidney selection for transplantation.

Place, publisher, year, edition, pages
2009. Vol. 7, no 16
National Category
Biochemistry and Molecular Biology
URN: urn:nbn:se:su:diva-34703DOI: 10.1186/1477-5956-7-16ISI: 000266424100001PubMedID: 19358702OAI: diva2:285325
Available from: 2010-01-11 Created: 2010-01-11 Last updated: 2011-04-20Bibliographically approved
In thesis
1. Proteomics in biomarker research: Insights into the effects of aging and environment on biological systems
Open this publication in new window or tab >>Proteomics in biomarker research: Insights into the effects of aging and environment on biological systems
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Proteomics is the global analysis of proteins that covers a broad range of technologies aimed at determining the identity and quantity of proteins expressed in the cell, their three-dimensional structure and interaction partners. In contrast to genome, proteome reflects more accurately on the dynamic state of the cell, tissue, or an organism. Therefore much is expected from proteomics to yield better disease markers for early diagnosis and therapy monitoring, as well as biomarkers that would indicate environmental exposure or provide prediction of biological age.

In this thesis, I have developed and applied robust and sensitive subproteomic approaches to study the effect of aging as well as and environmental pollution using different animal models.

In the first part, a high-throughput proteomic method based on liquid chromatography coupled to 2-dimensional gel electrophoresis (LC/2-DE) was developed. The usefulness of this method has been demonstrated by applying it to the assessment of marine pollution in a field experiment.

Next, I have utilized this subproteomic approach to study the effect of aging in mouse kidney of both genders. As a result, a protein expression signature of aging kidney was obtained, revealing gender-dependent alterations in proteome profiles of aging mouse kidney.

In order to further reduce the dynamic range of protein expression and increase the sensitivity of proteomic analysis, I have applied a shotgun mass spectrometry-based proteomic approach using isobaric tags for relative and absolute quantification (iTRAQ) coupled to liquid chromatography and tandem mass spectrometry (LC-MS/MS) to study age-related differences in peroxisome-enriched fractions from mouse liver. Only eight proteins showed statistically significant difference in expression (p<0.05) with moderate folds. This study indicates that age-depended changes in the liver proteome are minimal, suggesting that its proteome is efficiently maintained until certain age.

Finally, in the context of aging studies and the role of peroxisomes in aging, I have tested the utility of cell-penetrating peptides (CPPs) as agents for protein delivery into acatalasemic peroxisomes using yeast as a model. The results obtained suggest that CPPs may be suitable for the delivery of antioxidants to peroxisomes and in future could provide a tool for the protein therapy of age-related diseases.

Place, publisher, year, edition, pages
Stockholm: Department of Biochemistry and Biophysics, Stockholm University, 2011. 63 p.
proteomics, biomarker, peroxisomes, 2-dimensional gel electrophoresis (2-DE), mass spectrometry (MS), aging, marine pollution
National Category
Biochemistry and Molecular Biology Environmental Sciences Biochemistry and Molecular Biology
Research subject
urn:nbn:se:su:diva-56483 (URN)978-91-7447-209-7 (ISBN)
Public defence
2011-05-27, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 14:00 (English)
At the time of the doctoral defense, the following publications were unpublished and had a status as follows: Paper 3: Submitted, Paper 4: Submitted.Available from: 2011-05-05 Created: 2011-04-18 Last updated: 2011-05-10Bibliographically approved

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