Proteomics characterization of extracellular space components in the human aorta

Athanasios Didangelos, Xiaoke Yin, Kaushik Mandal, Mark Baumert, Marjan Jahangiri, Manuel Mayr

Research output: Contribution to journalArticle

Abstract

The vascular extracellular matrix (ECM) is essential for the structural integrity of the vessel wall and also serves as a substrate for the binding and retention of secreted products of vascular cells as well as molecules coming from the circulation. Although proteomics has been previously applied to vascular tissues, few studies have specifically targeted the vascular ECM and its associated proteins. Thus, its detailed composition remains to be characterized. In this study, we describe a methodology for the extraction of extracellular proteins from human aortas and their identification by proteomics. The approach is based on (a) effective decellularization to enrich for scarce extracellular proteins, (b) successful solubilization and deglycosylation of ECM proteins, and (c) relative estimation of protein abundance using spectral counting. Our three-step extraction approach resulted in the identification of 103 extracellular proteins of which one-third have never been reported in the proteomics literature of vascular tissues. In particular, three glycoproteins (podocan, sclerostin, and agrin) were identified for the first time in human aortas at the protein level. We also identified extracellular adipocyte enhancer-binding protein 1, the cartilage glycoprotein asporin, and a previously hypothetical protein, retinal pigment epithelium (RPE) spondin. Moreover, our methodology allowed us to screen for proteolysis in the aortic samples based on the identification of proteolytic enzymes and their corresponding degradation products. For instance, we were able to detect matrix metalloproteinase-9 by mass spectrometry and relate its presence to degradation of fibronectin in a clinical specimen. We expect this proteomics methodology to further our understanding of the composition of the vascular extracellular environment, shed light on ECM remodeling and degradation, and provide insights into important pathological processes, such as plaque rupture, aneurysm formation, and restenosis.

Original languageEnglish (US)
Pages (from-to)2048-2062
Number of pages15
JournalMolecular and Cellular Proteomics
Volume9
Issue number9
DOIs
StatePublished - Sep 2010

Fingerprint

Extracellular Space
Proteomics
Aorta
Blood Vessels
Proteins
Extracellular Matrix
Degradation
Glycoproteins
Agrin
Tissue
Proteolysis
Retinal Pigments
Retinal Pigment Epithelium
Extracellular Matrix Proteins
Matrix Metalloproteinase 9
Cartilage
Structural integrity
Pathologic Processes
Chemical analysis
Fibronectins

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Cite this

Didangelos, A., Yin, X., Mandal, K., Baumert, M., Jahangiri, M., & Mayr, M. (2010). Proteomics characterization of extracellular space components in the human aorta. Molecular and Cellular Proteomics, 9(9), 2048-2062. https://doi.org/10.1074/mcp.M110.001693

Proteomics characterization of extracellular space components in the human aorta. / Didangelos, Athanasios; Yin, Xiaoke; Mandal, Kaushik; Baumert, Mark; Jahangiri, Marjan; Mayr, Manuel.

In: Molecular and Cellular Proteomics, Vol. 9, No. 9, 09.2010, p. 2048-2062.

Research output: Contribution to journalArticle

Didangelos, A, Yin, X, Mandal, K, Baumert, M, Jahangiri, M & Mayr, M 2010, 'Proteomics characterization of extracellular space components in the human aorta', Molecular and Cellular Proteomics, vol. 9, no. 9, pp. 2048-2062. https://doi.org/10.1074/mcp.M110.001693
Didangelos, Athanasios ; Yin, Xiaoke ; Mandal, Kaushik ; Baumert, Mark ; Jahangiri, Marjan ; Mayr, Manuel. / Proteomics characterization of extracellular space components in the human aorta. In: Molecular and Cellular Proteomics. 2010 ; Vol. 9, No. 9. pp. 2048-2062.
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