Ontology type: schema:ScholarlyArticle Open Access: True
2010-10
AUTHORSIlse M Rood, Jeroen K J Deegens, Michael L Merchant, Wim P M Tamboer, Daniel W Wilkey, Jack F M Wetzels, Jon B Klein
ABSTRACTUrinary microvesicles, such as 40-100 nm exosomes and 100-1000 nm microparticles, contain many proteins that may serve as biomarkers of renal disease. Microvesicles have been isolated by ultracentrifugation or nanomembrane ultrafiltration from normal urine; however, little is known about the efficiency of these methods in isolating microvesicles from patients with nephrotic-range proteinuria. Here we compared three techniques to isolate microvesicles from nephrotic urine: nanomembrane ultrafiltration, ultracentrifugation, and ultracentrifugation followed by size-exclusion chromatography (UC-SEC). Highly abundant urinary proteins were still present in sufficient quantity after ultrafiltration or ultracentrifugation to blunt detection of less abundant microvesicular proteins by MALDI-TOF-TOF mass spectrometry. The microvesicular markers neprilysin, aquaporin-2, and podocalyxin were highly enriched following UC-SEC compared with preparations by ultrafiltration or ultracentrifugation alone. Electron microscopy of the UC-SEC fractions found microvesicles of varying size, compatible with the presence of both exosomes and microparticles. Thus, UC-SEC following ultracentrifugation to further enrich and purify microparticles facilitates the search for prognostic biomarkers that might be used to predict the clinical course of nephrotic syndrome. More... »
PAGES810-816
http://scigraph.springernature.com/pub.10.1038/ki.2010.262
DOIhttp://dx.doi.org/10.1038/ki.2010.262
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/20686450
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