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Experiment number
  • If needed, multiple experiments were identified in a single publication based on differing sample types, isolation protocols and/or vesicle types of interest.
Species
  • Species of origin of the EVs.
Isolation protocol
  • Gives a short, non-chronological overview of the different steps of the isolation protocol.
    • dUC = differential ultracentrifugation
    • DG = density gradient
    • UF = ultrafiltration
    • SEC = size-exclusion chromatography
Details EV-TRACK ID Experiment nr. Species Sample type Isolation protocol First author Year EV-METRIC
EV170028 1/1 Homo sapiens Cell culture supernatant Commercial method Foers AD 2017 77%

Study summary

Full title
All authors
Foers AD, Chatfield S, Dagley LF, Scicluna BJ, Webb AI, Cheng L, Hill AF, Wicks IP, Pang KC.
Journal
J Extracell Vesicles
Abstract
As a complex biological fluid, human synovial fluid (SF) presents challenges for extracellular vesic (show more...)As a complex biological fluid, human synovial fluid (SF) presents challenges for extracellular vesicle (EV) enrichment using standard methods. In this study of human SF, a size exclusion chromatography (SEC)-based method of EV enrichment is shown to deplete contaminants that remain after standard ultracentrifugation-based enrichment methods. Specifically, considerable levels of serum albumin, the high-density lipoprotein marker, apolipoprotein A-I, fibronectin and other extracellular proteins and debris are present in EVs prepared by differential ultracentrifugation. While the addition of a sucrose density gradient purification step improved purification quality, some contamination remained. In contrast, using a SEC-based approach, SF EVs were efficiently separated from serum albumin, apolipoprotein A-I and additional contaminating proteins that co-purified with high-speed centrifugation. Finally, using high-resolution mass spectrometry analysis, we found that residual contaminants which remain after SEC, such as fibronectin and other extracellular proteins, can be successfully depleted by proteinase K. Taken together, our results highlight the limitations of ultracentrifugation-based methods of EV isolation from complex biological fluids and suggest that SEC can be used to obtain higher purity EV samples. In this way, SEC-based methods are likely to be useful for identifying EV-enriched components and improving understanding of EV function in disease. (hide)
EV-METRIC
77% (98th percentile of all experiments on the same sample type)
 Reported
 Not reported
 Not applicable
EV-enriched proteins
Protein analysis: analysis of three or more EV-enriched proteins
non EV-enriched protein
Protein analysis: assessment of a non-EV-enriched protein
qualitative and quantitative analysis
Particle analysis: implementation of both qualitative and quantitative methods
electron microscopy images
Particle analysis: inclusion of a widefield and close-up electron microscopy image
density gradient
Isolation method: density gradient, at least as validation of results attributed to EVs
EV density
Isolation method: reporting of obtained EV density
ultracentrifugation specifics
Isolation method: reporting of g-forces, duration and rotor type of ultracentrifugation steps
antibody specifics
Protein analysis: antibody clone/reference number and dilution
lysate preparation
Protein analysis: lysis buffer composition
Study data
Sample type
Cell culture supernatant
Focus vesicles
exosome
Isolation protocol
Isolation protocol
  • Gives a short, non-chronological overview of the
    different steps of the isolation protocol.
    • dUC = differential ultracentrifugation
    • DG = density gradient
    • UF = ultrafiltration
    • SEC = size-exclusion chromatography
Commercial method
Adj. k-factor
88.25 (pelleting) / 88.25 (washing)
Protein markers
EV: Alix/ CD63/ CD81/ TSG101
non-EV: GM130/ cytochromec
Proteomics
no
Show all info
Study aim
Function, Identification of content (omics approaches)
Sample
Species
Homo sapiens
Sample Type
Cell culture supernatant
Sample Condition
Colorectal cancer
EV-producing cells
Primary tumor-derived fibroblasts
EV-harvesting Medium
EV-depleted serum
Preparation of EDS
overnight (16h) at >=100,000g
Isolation Method
Differential ultracentrifugation
dUC: centrifugation steps
Below or equal to 800 g
Between 800 g and 10,000 g
Between 100,000 g and 150,000 g
Pelleting: time(min)
70
Pelleting: rotor type
Type 50.3 Ti
Pelleting: speed (g)
100000
Pelleting: adjusted k-factor
88.25
Wash: time (min)
70
Wash: Rotor Type
Type 50.3 Ti
Wash: speed (g)
100000
Wash: adjusted k-factor
88.25
Characterization: Protein analysis
Protein Concentration Method
BCA
Protein Concentration
100
Western Blot
Antibody details provided?
Yes
Lysis buffer provided?
Yes
Detected EV-associated proteins
Alix, CD63, CD81, TSG101
Not detected contaminants
GM130, cytochrome c
Fluorescent NTA
Characterization: Particle analysis
NTA
Report type
Modus
Reported size (nm)
113
EV concentration
Yes
Particle yield
1.57E+12 particles/million cells
EM
EM-type
Transmission-EM
Image type
Close-up, Wide-field
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