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Using Nanoplasmon-Enhanced Scattering and Low-Magnification Microscope Imaging to Quantify Tumor-Derived Exosomes
Published on: May 24, 2019
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Proteogenomic analysis reveals exosomes are more oncogenic than ectosomes
Shivakumar Keerthikumar1, Lahiru Gangoda1, Michael Liem1
1Department of Biochemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia.
Oncotarget
|May 7, 2015
Summary
Researchers identified protein markers to distinguish between exosomes and ectosomes, types of extracellular vesicles. This study reveals exosomes promote cancer cell growth and migration, highlighting their oncogenic role.
Area of Science:
- Cell Biology
- Molecular Biology
- Cancer Research
Background:
- Extracellular vesicles (EVs) encompass exosomes and ectosomes, differing in biogenesis and size.
- Currently, no reliable markers distinguish exosomes from ectosomes.
- Functional differences between these EVs remain poorly understood.
Purpose of the Study:
- To identify protein markers for discriminating between exosomes and ectosomes.
- To investigate the functional roles of exosomes and ectosomes in cancer progression.
- To explore the potential of EVs as cancer biomarkers.
Main Methods:
- Label-free quantitative proteomics to identify EV proteins.
- Proteogenomics analysis of tumor-derived EVs.
- Bioinformatics to analyze cargo enrichment.
- Functional assays measuring cell proliferation and migration.
Main Results:
- Proteins were identified as potential markers to distinguish exosomes and ectosomes.
- Secreted mutant proteins implicated in cancer progression were detected in tumor-derived EVs.
- Exosomes, but not ectosomes, significantly enhanced recipient cell proliferation and migration.
- Oncogenic cargo was enriched in both exosomes and ectosomes.
Conclusions:
- Cancer cells promote oncogenesis via exosome and ectosome secretion of mutant proteins.
- Exosomes play a significant role in driving cancer progression.
- The proteogenomics approach can identify potential biomarkers for liquid biopsies in cancer patients.
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