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Extracellular Vesicle Uptake Assay via Confocal Microscope Imaging Analysis
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An immunoassay for urinary extracellular vesicles.

Mahdi Salih1, Robert A Fenton2, Jeroen Knipscheer1

  • 1Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands.

American Journal of Physiology. Renal Physiology
|January 30, 2016
PubMed
Summary

A novel immunoassay simplifies urinary extracellular vesicle (uEV) analysis for biomarker discovery. This method efficiently isolates, quantifies, and normalizes uEV proteins, overcoming previous limitations.

Keywords:
CD9aquaporin-2biomarkerexosomesmicrovesiclessodium-chloride cotransporter

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biomarker Discovery

Background:

  • Urinary extracellular vesicles (uEVs) are valuable biomarkers, but isolation methods are slow, limiting high-throughput applications.
  • Current techniques for uEV isolation and protein quantification are time-consuming and complex.
  • Standardization of uEV analysis is crucial for reliable biomarker discovery.

Purpose of the Study:

  • To develop a novel immunoassay for rapid isolation, quantification, and normalization of urinary extracellular vesicle (uEV) proteins.
  • To establish a high-throughput method for uEV biomarker analysis.
  • To validate the immunoassay's performance for detecting specific proteins like aquaporin-2 (AQP2) and sodium-chloride cotransporter (NCC).

Main Methods:

  • Designed a sandwich immunoassay utilizing a biotinylated CD9 antibody for uEV capture.
  • Employed antibodies against the protein of interest (e.g., AQP2, NCC) and conjugated antibodies for quantification.
  • Validated CD9 as a reliable normalization factor by correlating it with urine creatinine.
  • Compared immunoassay results with traditional ultracentrifugation and immunoblot methods.

Main Results:

  • The immunoassay demonstrated high sensitivity, low variability, and stability in dilution series for AQP2 and NCC detection.
  • Results from the immunoassay closely matched those obtained by traditional methods after water loading.
  • The assay successfully detected altered AQP2 and NCC levels in patients with water or salt reabsorption disorders.
  • CD9 was identified as a suitable normalization marker for spot urine samples.

Conclusions:

  • A novel, efficient immunoassay has been developed for analyzing uEV proteins, addressing current isolation and normalization challenges.
  • This method requires minimal urine volume and facilitates high-throughput biomarker discovery.
  • The immunoassay reliably detects physiological and pathological changes in uEV protein levels, offering a promising tool for clinical diagnostics.