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Isolation of Murine Coronary Vascular Smooth Muscle Cells
Published on: May 30, 2016
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Proteomic Profiling Exosomes from Vascular Smooth Muscle Cell.
Hong Qiu1, Songshan Shi1,2, Shunchun Wang1,2
1Complex Carbohydrate Research Center, Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA, 30602, USA.
Proteomics. Clinical Applications
|April 25, 2018
Summary
Vascular smooth muscle cell (VSMC)-derived exosomes contain 459 proteins involved in cell adhesion and platelet activation. These exosomes maintain vessel homeostasis rather than promoting angiogenesis, suggesting their role in vascular health.
Area of Science:
- Cell Biology
- Vascular Biology
- Proteomics
Background:
- Vascular smooth muscle cells (VSMC) and endothelial cells (EC) engage in crucial bidirectional communication for vascular development and homeostasis.
- Exosomes, small extracellular vesicles, are recognized as key mediators in this VSMC-EC crosstalk.
- Understanding the protein cargo of exosomes is essential to elucidate their role in intercellular communication.
Purpose of the Study:
- To comprehensively characterize the proteome of human VSMC-derived exosomes.
- To investigate the functional implications of these exosomal proteins in VSMC-EC communication.
- To assess the in vivo angiogenic potential of VSMC-derived exosomes.
Main Methods:
- Proteomic analysis of human VSMC-derived exosomes using nano liquid chromatography-tandem mass spectrometry (nanoLC-MS/MS).
- Gene ontology analysis of identified exosomal proteins to determine their cellular components, molecular functions, and biological processes.
- In vivo assessment of VSMC-derived exosomes for proangiogenic activity using an established angiogenesis assay.
Main Results:
- Identification of 459 unique proteins within VSMC-derived exosomes.
- Gene ontology analysis revealed significant enrichment in cell-cell adhesion and platelet activation/coagulation pathways.
- VSMC-derived exosomes did not exhibit proangiogenic activity in vivo, indicating a role in maintaining vascular homeostasis.
Conclusions:
- The proteomic characterization provides a systematic overview of proteins within VSMC-derived exosomes.
- These findings highlight the potential regulatory roles of VSMC-derived exosomes in VSMC-EC communication.
- Dysregulation of exosome-mediated functions may disrupt vascular homeostasis, contributing to the pathogenesis of vascular diseases.
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