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Updated: Jul 9, 2026

A Modified Precipitation Method to Isolate Urinary Exosomes
Published on: January 16, 2015
Exosomes in urine: who would have thought...?
1Laboratory of Kidney and Electrolyte Metabolism, National Heart, Lung, and Blood Institute, Bethesda, Maryland, USA. knep@helix.nih.gov
Urine contains thousands of proteins from tiny vesicles called exosomes, secreted by kidney cells. These exosomes, also found in amniotic fluid, show potential for discovering future disease biomarkers.
Area of Science:
- Biochemistry
- Urology
- Molecular Biology
Background:
- Normal urine is a complex biological fluid containing thousands of proteins.
- Exosomes, small vesicles originating from renal epithelial cells, are a major source of urinary proteins.
Purpose of the Study:
- To highlight the significance of urinary exosomes in protein content.
- To underscore the potential of exosomes as biomarkers for disease detection.
Main Methods:
- Analysis of urinary protein composition.
- Identification and characterization of exosomes in urine.
- Investigation of exosome retrieval from amniotic fluid.
Main Results:
- Exosomes constitute a significant portion of the proteins found in normal urine.
- Exosomes can be successfully isolated from amniotic fluid, similar to urine.
Conclusions:
- Urinary exosomes are a rich source of potential disease biomarkers.
- The presence of exosomes in both urine and amniotic fluid expands their utility in diagnostic research.
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