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Extracellular Vesicle Integrins Distinguish Unique Cancers

Department of Biomedical Sciences, Florida State University College of Medicine, Tallahassee, FL 32306, USA
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Author to whom correspondence should be addressed.
Proteomes 2019, 7(2), 14; https://doi.org/10.3390/proteomes7020014
Received: 13 March 2019 / Revised: 3 April 2019 / Accepted: 9 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Proteomes of Extracellular Vesicles)
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Abstract

The proteomic profile of extracellular vesicles (EVs) has been of increasing interest, particularly in understanding cancer growth, drug resistance, and metastatic behavior. Emerging data suggest that cancer-derived EVs carry an array of oncogenic cargo, including certain integrin proteins that may, in turn, promote cell detachment, migration, and selection of future metastatic sites. We previously reported a large comparison of secreted vesicle protein cargo across sixty diverse human cancer cell lines. Here, we analyze the distinct integrin profiles of these cancer EVs. We further demonstrate the enrichment of integrin receptors in cancer EVs compared to vesicles secreted from benign epithelial cells. The total EV integrin levels, including the quantity of integrins α6, αv, and β1 correlate with tumor stage across a variety of epithelial cancer cells. In particular, integrin α6 also largely reflects breast and ovarian progenitor cell expression, highlighting the utility of this integrin protein as a potential circulating biomarker of certain primary tumors. This study provides preliminary evidence of the value of vesicle-associated integrin proteins in detecting the presence of cancer cells and prediction of tumor stage. Differential expression of integrins across cancer cells and selective packaging of integrins into EVs may contribute to further understanding the development and progression of tumor growth and metastasis across a variety of cancer types. View Full-Text
Keywords: Exosomes; mass spectrometry; proteomics; biomarkers; cancer; extracellular vesicles; microvesicles; oncosomes Exosomes; mass spectrometry; proteomics; biomarkers; cancer; extracellular vesicles; microvesicles; oncosomes
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Hurwitz, S.N.; Meckes, D.G., Jr. Extracellular Vesicle Integrins Distinguish Unique Cancers. Proteomes 2019, 7, 14.

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