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Quantitative proteomics reveals key proteins regulated by eicosapentaenoic acid in endothelial activation.

Abstract：

:Eicosapentaenoic acid (EPA), an n-3 polyunsaturated fatty acid (PUFA), has been shown to decrease the risk of atherosclerosis by attenuating endothelial activation. In this study, we used mass spectrometry-based label-free quantitative proteomics to study the protective mechanisms of EPA and to identify key proteins that regulated by EPA in endothelial activation. Arachidonic acid (AA) was used as a control. HUVECs were pretreated with each of the two PUFAs, and then stimulated with TNFα as a model of endothelial activation. A total of 3391 proteins were identified, and 1958 proteins were quantified. Pearson's correlation coefficients revealed the excellent biological reproducibility of the proteomic results. Gene Ontology and KEGG enrichment analysis of differentially expressed proteins was performed, thus leading to the identification of the glutathione metabolism, oxidation reduction, and DNA replication as the most significantly enriched pathways. Seven key proteins were identified: elongation factor Tu (mitochondrial, TUFM), integrin alpha 6 (ITGA6), catalase (CAT), annexin A6 (ANXA6), heat shock 70 kDa protein 1A (HSPA1A), glutamate-cysteine ligase regulatory subunit (GCLM), and heme oxygenase 1 (HMOX1). Further connections among these proteins were also revealed by protein-protein interaction analysis. The mRNA levels of CAT, GCLM, and HMOX1 were verified with real-time PCR. The protein level of CAT was verified using Western blotting. This study is an in-depth proteomics analysis of EPA-treated cells and may provide possible insights into the molecular mechanisms of EPA's cytoprotective and atheroprotective effects.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Zhang L,Xiao K,Zhao X,Sun X,Zhang J,Wang X,Zhu Y,Zhang X

doi

10.1016/j.bbrc.2017.04.091

subject

Has Abstract

pub_date

2017-05-27 00:00:00

pages

464-469

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(17)30767-2

journal_volume

487

pub_type

杂志文章

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