期刊
MECHANISMS OF AGEING AND DEVELOPMENT
卷 152, 期 -, 页码 56-62出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mad.2015.09.005
关键词
Enolase; CD4(+)T cell; Plasma membrane proteomics; 2D gel electrophoresis; Phenotype
资金
- MARK-AGE (EU FP7 Large-scale integrating Project) [HEALTH-F4-2008-200880]
- COST [CM1001]
- Rosetrees Trust [M430] Funding Source: researchfish
To identify novel cell ageing markers in order to gain insight into ageing mechanisms, we adopted membrane enrichment and comparison of the CD4(+) T cell membrane proteome (purified by cell surface labelling using Sulfo-NHS-SS-Biotin reagent) between healthy young (n = 9, 20-25 years) and older (n = 10; 50-70 years) male adults. Following two-dimensional gel electrophoresis (2DE) to separate pooled membrane proteins in triplicates, the identity of protein spots with age-dependent differences <0.05 and >1.4 fold difference) was determined using liquid chromatography-mass spectrometry (LC-MS/MS). Seventeen protein spot density differences (ten increased and seven decreased in the older adult group) were observed between young and older adults. From spot intensity analysis, CD4(+) T cell surface alpha-enolase was decreased in expression by 1.5 fold in the older age group; this was verified by flow cytometry (n = 22) and qPCR with significantly lower expression of cellular alpha-enolase mRNA and protein compared to young adult CD4(+) T cells (p < 0.05). In an independent age-matched case-control study, lower CD4(+) T cell surface et-enolase expression was observed in age-matched patients with cardiovascular disease (p < 0.05). An immune-modulatory role has been proposed for surface alpha-enolase and our findings of decreased expression suggest that deficits in surface alpha-enolase merit investigation in the context of immune dysfunction during ageing and vascular disease. (C) 2015 Elsevier Ireland Ltd. All rights reserved.
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