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Isolation and characterization of urine microvesicles from prostate cancer patients: different approaches, different visions


Posted: 2021-09-28 19:00:00
Background: Because of their specific and biologically relevant cargo, urine extracellular vesicles (EVs) constitute a valuable source of potential non-invasive biomarkers that could support the clinical decision-making to improve the management of prostate cancer (PCa) patients. Different EV isolation methods differ in terms of complexity and yield, conditioning, as consequence, the analytical result. Methods: The aim of this study was to compare three different isolation methods for urine EVs: ultracentrifugation (UC), size exclusion chromatography (SEC), and a commercial kit (Exolute® Urine Kit). Urine samples were collected from 6 PCa patients and 4 healthy donors. After filtered through 0.22 µm filters, urine was divided in 3 equal volumes to perform EVs isolation with each of the three approaches. Isolated EVs were characterized by spectrophotometric protein quantification, nanoparticle tracking analysis, transmission electron microscopy, AlphaScreen Technology, and whole miRNA Transcriptome. Results: Our results showed that UC and SEC provided better results in terms of EVs yield and purity than Exolute®, non-significant differences were observed in terms of EV-size. Interestingly, luminescent AlphaScreen assay demonstrated a significant enrichment of CD9 and CD63 positive microvesicles in SEC and UC methods compared with Exolute®. This heterogeneity was also demonstrated in terms of miRNA content indicating that the best correlation was observed between UC and SEC. Conclusions: Our study highlights the importance of standardizing the urine EV isolation methods to guaranty the analytical reproducibility necessary for their implementation in a clinical setting. Keywords: Exosomes; Extracellular microvesicles; Size exclusion chromatography; Ultracentrifugation; miRNA.

参考サイト PubMed: exsome



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樹状細胞由来のエクソソームが多発性硬化症の治療候補に - Neuroscience 2013

現在、多発性硬化症 (MS) の治療方法には髄鞘再形成を促進するようなタイプのものはない。しかし、2013年5月10日、サンディエゴで開かれていたSociety for Neuroscience 2013年総会において、取材に対して、University of Chicago Medicine, Director of the Migraine Headache ClinicでProfessor in Neurosciencesを務めるRichard Kraig, M.D.,…

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